Power Management

S8337

Seiko Instruments Inc

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER

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www.sii-ic.com STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER © SII Semiconductor Corporation, 2003-2010 Rev.4.0_01 The S-8337/8338 Series is a CMOS step-up switching regulat or which mainly consists of a reference voltage circuit, an oscillator, an error amplifier, a PWM contro ller, an under voltage lockout circuit (UVLO), and a timer latch short-circuit protection circuit. Because its minimu m operating voltage is as low as 1.8 V, this switching regulator is ideal for the power supply of an LCD or for portable systems that oper ate on a low voltage. The internal oscillation frequency can be set up to 1.133 MHz, via the resistor connected to the ROSC pin. With the S-8337 Series, the maximum duty ratio of PWM c ontrol can be controlled by the resistor connected to the RDuty pin. With the S-8338 Series, the maximum dut y ratio is fixed (to 88%). The phase compensation and gain value can be adjusted according to the values of the resistor and capacitor connected to the CC pin. Therefore, the operation stability and transient response can be correctly set for each application. The reference voltage accuracy is as high as 1.0 V ±1.5%, and any voltage can be out put by using an external output voltage setting resistor. In addition, the delay time of the shor t-circuit protection circuit can be set by using the capacitor connected to the CSP pin. If the maximum duty c ondition continues because of short-ci rcuiting, the capacitor externally connected to the CSP pin is charged, and oscillation stops a fter a specific time. This condition is cleared by re-application of power or by setting the switching regul ator (S-8338 Series) to the shutdown status. A ceramic capacitor or a tantalum capacitor is used as the output capacitor, depending on the setting. This controller IC allows various settings and selections and employs a small package, making it very easy to use.  Features

Low voltage operation: 1.8 V to 6.0 V
Oscillation frequency: 286 kHz to 1.133 MHz (selectable by external resistor)
Maximum duty: 47 to 88.5% (selectable by exte rnal resistor) (S-8337 Series) Fixed to 88% typ. (S-8338 Series)
Reference voltage: 1.0 V ±1.5%
UVLO (under-voltage lockout) function: Detection voltage can be selected from between 1.5 V and 2.3 V in 0.1 V steps. Hysteresis width can be selected from between 0.1 V and 0.3 V in 0.1 V steps.
Timer latch short-circuit protection circuit: Delay time can be set using an external capacitor.
Soft-start function: Soft-start time can be selected in three steps, 10 ms, 15 ms, and 20 ms.
Phase compensation external setting: Adjustable by connecting resistor and capacitor in series to GND.
Shutdown function: S-8338 Series, shutdown current consumption: 1.0 μA max.
Lead-free, Sn 100%, halogen-free *1 *1. Refer to “ Product Name Structure ” for details.  Applications
Power supplies for LCDs and CCDs
Power supplies for portable equipment  Packages
8-Pin SON(A)
8-Pin TSSOP

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01  Block Diagram PWM comparator VOUT Timer latch short-circuit protection circuit RDuty (S-8337) or ON/OFF (S-8338) RFB2 VSS RFB1 FB SD L VIN EXT UVLO CSP CC RZ CZ ROSC CFB Oscillator Maximum duty circuit Reference voltage (1.0 V) soft-start circuit Error amplifier CIN CL Figure 1 Block Diagram

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series  Product Name Structure 1. Product name (1) 8-Pin SON(A) S-833 x A x x x - P8T1 G Environmental code G: Lead-free (for details, please contact our sales office) Package name (abbreviation) and packing specification P8T1: 8-Pin SON(A), tape Soft-start time setting A: 10 ms B: 15 ms C: 20 ms UVLO setting A: 2.3 V B: 2.2 V C: 2.1 V D: 2.0 V E: 1.9 V F: 1.8 V G: 1.7 V H: 1.6 V I: 1.5 V UVLO hysteresis setting A: 0.1 V B: 0.2 V C: 0.3 V Pin setting 7: With MaxDuty setting function 8: With Shutdown function

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 (2) 8-Pin TSSOP S-833 x A x x x - T8T1 x Environmental code U: Lead-free (Sn 100%), halogen-free G: Lead-free (for details, please contact our sales office) Package name (abbreviation) and packing specification T8T1: 8-Pin TSSOP , tape Soft-start time setting A: 10 ms B: 15 ms C: 20 ms UVLO setting A: 2.3 V B: 2.2 V C: 2.1 V D: 2.0 V E: 1.9 V F: 1.8 V G: 1.7 V H: 1.6 V I: 1.5 V UVLO hysteresis setting A: 0.1 V B: 0.2 V C: 0.3 V Pin setting 7: With MaxDuty setting function 8: With Shutdown function 2. Packages Package Name Drawing Code Package Tape Reel 8-Pin SON(A) PN008-A-P-SD PN008-A-C-SD PN008-A-R-SD 8-Pin TSSOP Environmental code = G FT008-A-P- SD FT008-E-C-SD FT008-E-R-SD Environmental code = U FT008-A-P- SD FT008-E-C-SD FT008-E-R-S1

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series  Pin Configurations Table 1 8-Pin SON(A) Top view Pin No. Symbol Description

1 CC Error amplifier circuit output phase

2 FB Output voltage feedback pin

3 CSP Short-circuit protection delay time

4 VIN Power supply input pin

5 EXT External transistor connection pin

6 VSS GND pin

7 ROSC Oscillation frequency setting resistor

RDuty Maximum duty setting resistor connection pin (S-8337 Series) OFFON/ Shutdown pin (S-8338 Series) Table 2 8-Pin TSSOP Top view Pin No. Symbol Description RDuty Maximum duty setting resistor connection pin (S-8337 Series) OFFON/ Shutdown pin (S-8338 Series)

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01  Absolute Maximum Ratings Table 3 Absolute Maximum Ratings (Unless otherwise specified: Ta = 25°C, VSS = 0 V) Parameter Symbol Absolute Maximum Rating Unit VIN pin voltage V IN VSS – 0.3 to V SS + 6.5 V FB pin voltage V FB VSS – 0.3 to V SS + 6.5 V EXT pin voltage V EXT VSS – 0.3 to V IN + 0.3 V CSP pin voltage V CSP VSS – 0.3 to V IN + 0.3 V CC pin voltage V CC VSS – 0.3 to V IN + 0.3 V CC pin current I CC ±10 mA ROSC pin voltage V ROSC VSS – 0.3 to V IN + 0.3 V ROSC pin current I ROSC ±10 mA RDuty pin voltage V RDuty VSS – 0.3 to V IN + 0.3 V RDuty pin current I RDuty ±10 mA ON/OFF pin voltage V ON/OFF VSS – 0.3 to V SS + 6.5 V Power dissipation 8-Pin SON(A) PD 300 (When not mounted on board) mW 600*1 mW 8-Pin TSSOP 300 (When not mounted on board) mW 700*1 mW Operating ambient temperature T opr –40 to +85 °C Storage temperature T stg –40 to +125 °C *1. When mounted on board [Mounted board] (1) Board size : 114.3 mm × 76.2 mm × t1.6 mm (2) Board name : JEDEC STANDARD51-7 Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. (1) When mounted on board (2) When not mounted on board 0 50 100 150 600 400 200 Power Dissipation PD (mW) Ambient Temperature Ta (°C) 500 300 100 700 800 8-Pin SON(A) 8-Pin TSSOP 0 50 100 150 300 200 100 Power Dissipation PD (mW) Ambient Temperature Ta (°C) 400 8-Pin SON(A) 8-Pin TSSOP Figure 4 Power Dissipation of Package

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series  Electrical Characteristics 1. S-8337 Series Table 4 Electrical Characteristics (Unless otherwise specified: V IN = 3.3 V, Ta = 25°C) Parameter Symbol Conditions Min. Typ. Max. Unit Test Circuit Operating input voltage V IN ⎯ 1.8 ⎯ 6.0 V 2 FB voltage V FB ⎯ 0.985 1.000 1.015 V 2 Current consumption I SS1 fosc = 700 kHz VFB = 0.95 V ⎯ 400 700 μA 1 EXT pin output current IEXTH V EXT = VIN − 0.4 V ⎯ −100 −60 mA 1 IEXTL V EXT = 0.4 V 100 160 ⎯ mA 1 FB voltage temperature coefficient ΔVFB ΔTa Ta = −40°C to +85°C ⎯ ±100 ⎯ ppm/ °C2 FB pin input current I FB ⎯ −0.1 ⎯ +0.1 μA 1 Oscillation frequency *1 fosc fosc = 1133 kHz (R OSC = 120 kΩ) fosc = 700 kHz (R OSC = 200 kΩ) fosc = 286 kHz (R OSC = 510 kΩ) VFB = 0.9 V Waveform on EXT pin is measured. fosc × 0.9 fosc fosc × 1.1 kHz 1 Oscillation frequency temperature coefficient Δfosc ΔTa Ta = −40°C to +85°C fosc = 700 kHz ⎯ 1000 ⎯ ppm/ °C1 Max. duty*2 MaxDuty fosc = 700 kHz (R OSC = 200 kΩ) MaxDuty = 88.5% (RDuty = 100 kΩ) MaxDuty = 77% (RDuty = 300 kΩ) MaxDuty = 47% (RDuty = 820 kΩ) MaxDuty − 5 MaxDuty MaxDuty + 5 % 1 Soft-start time t SS tSS = 10 ms, 15 ms, 20 ms Selected in three steps tSS × 0.75 tSS tSS × 1.5 ms 1 Short-circuit protection delay time*3 tPRO tPRO = 50 ms (CSP = 0.1 μF) 37.5 50 75 ms 1 UVLO detection voltage V UVLO VUVLO = 1.5 V to 2.3 V Selected in 0.1 V steps VUVLO × 0.95 VUVLO VUVLO × 1.05 V 1 UVLO hysteresis width V UVLOHYS VUVLOHYS = 0.1 V to 0.3 V Selected in 0.1 V steps VUVLOHYS × 0.6 VUVLOHYS VUVLOHYS × 1.4 mV 1 CC pin output current ICCH V FB = 2 V −75 −50 −37.5 μA 1 ICCL V FB = 0 V 37.5 50 75 μA 1 Timer latch reset voltage V RTLT ⎯ 0.7 1.0 1.3 V 1 *1. The recommended range of the resistance (R osc) for setting the oscilla tion frequency is R osc = 120 k Ω to 510 k Ω (fOSC = 286 kHz to 1.133 MHz). However, the oscillation frequency is in the range of typical values when an ideal resistor is externally connecte d, so actually the fluctuation of the IC ( ±10%) must be considered. However, the maximum duty is in the range of typical values when an ideal resistor is externally connected, so actually the flu ctuation of the IC ( ±5%) must be considered. *3. The short-circuit protection time can be set by the external c apacitor, and the maximum set value by the external capacitor is unlimited when an ideal case is assumed. But, use C SP = approximately 0.47 μF as a target maximum value due to the need to consider the discharge time of the capacitor.

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 2. S-8338 Series Table 5 Electrical Characteristics (Unless otherwise specified: V IN = 3.3 V, Ta = 25°C) Parameter Symbol Conditions Min. Typ. Max. Unit Test Circuit Operating input voltage V IN ⎯ 1.8 ⎯ 6.0 V 2 FB voltage V FB ⎯ 0.985 1.000 1.015 V 2 Current consumption I SS1 fosc = 700 kHz VFB = 0.95 V ⎯ 400 700 μA 1 Shutdown current consumption ISSS V IN = 6.0 V ⎯ ⎯ 1.0 μA 1 EXT pin output current IEXTH V EXT = VIN − 0.4 V ⎯ −100 −60 mA 1 IEXTL V EXT = 0.4 V 100 160 ⎯ mA 1 FB voltage temperature coefficient ΔVFB ΔTa Ta = −40°C to +85°C ⎯ ±100 ⎯ ppm/ °C2 FB pin input current I FB ⎯ −0.1 ⎯ +0.1 μA 1 Oscillation frequency *1 fosc fosc = 1133 kHz (R OSC = 120 kΩ) fosc = 700 kHz (R OSC = 200 kΩ) fosc = 286 kHz (R OSC = 510 kΩ) VFB = 0.9 V Waveform on EXT pin is measured fosc × 0.9 fosc fosc × 1.1 kHz 1 Oscillation frequency temperature coefficient Δfosc ΔTa Ta = −40°C to +85°C fosc = 700 kHz ⎯ 1000 ⎯ ppm/ °C1 Max. duty ratio MaxDuty f osc = 700 kHz (R OSC = 200 kΩ) 83 88 93 % 1 Soft-start time t SS tSS = 10 ms, 15 ms, 20 ms Selectable in three steps tSS × 0.75 tSS tSS × 1. 5 ms 1 Short-circuit protection delay time*2 tPRO tPRO = 50 ms (CSP = 0.1 μF) 37.5 50 75 ms 1 UVLO detection voltage V UVLO VUVLO = 1.5 V to 2.3 V Selected in 0.1 V steps VUVLO × 0.95 VUVLO VUVLO × 1.05 V 1 UVLO hysteresis width V UVLOHYS VUVLOHYS = 0.1 V to 0.3 V Selected in 0.1 V steps VUVLOHYS × 0.6 VUVLOHYS VUVLOHYS × 1.4 mV 1 CC pin output current ICCH V FB = 2 V −75 −50 −37.5 μA 1 ICCL V FB = 0 V 37.5 50 75 μA 1 Timer latch reset voltage VRTLT ⎯ 0.7 1.0 1.3 V 1 Shutdown pin input voltage (High level) VSH ⎯ 1.8 ⎯ ⎯ V 1 Shutdown pin input voltage (Low level) VSL ⎯ ⎯ ⎯ 0.3 V 1 Shutdown pin input current (High level) ISH ⎯ −0.1 ⎯ +0.1 μA 1 Shutdown pin input current (Low level) ISL ⎯ −0.1 ⎯ +0.1 μA 1 *1. The recommended range of the resistance (R osc) for setting the oscillation frequency is R osc = 120 kΩ to 510 kΩ (fosc = 286 kHz to 1.133 MHz). However, the oscillation frequency is in the range of typica l values when an ideal resistor is externally connected, so actually the fluctuation of the IC ( ±10%) must be considered. *2. The short-circuit protection time can be set by the external c apacitor, and the maximum set value by the external capacitor is unlimited when an ideal case is assumed. But, use C SP = approximately 0.47 μF as a target maximum value due to the need to consider the discharge time of the capacitor.

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series  External Parts When Measuring Electrical Characteristics Table 6 External Parts Element Name Symbol Manufacturer Part Number Inductor L TDK Corporation LDR655312T 4.7 μH Diode SD Rohm Co., Ltd. RB491D Output capacitor CL ⎯ Ceramic 10 μF Transistor M1 Sanyo Electric Co., Ltd. MCH3406 Oscillation frequency setting resistor ROSC ⎯ 200 kΩ (when fOSC = 700 kHz) Maximum duty ratio setting resistor RDuty ⎯ 300 kΩ (when MaxDuty = 77%) Short-circuit protection delay time setting capacitor CSP ⎯ 0.1 μF (when tPRO = 50 ms) Output voltage setting resistor 1 RFB1 ⎯ 8.2 kΩ (when VOUT = 9.2 V) Output voltage setting resistor 2 RFB2 ⎯ 1.0 kΩ (when VOUT = 9.2 V) FB pin capacitor CFB ⎯ 180 pF Phase compensation resistor RZ ⎯ 200 kΩ Phase compensation capacitor CZ ⎯ 0.01 μF

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series  Operation 1. Switching control method PWM control (S-8337/8338 Series) The S-8337/8338 Series is a DC-DC converter usin g a pulse width modulation method (PWM). The pulse width of the S-8337/8338 Series varies from 0% to the maximum duty set by RDuty depending on the load current (the pulse width of the S- 8338 Series is fixed to 88%), but its switching frequency does not change. Consequently, the ripple voltage generated from switching can be removed easily via a filter. 2. Soft-start function For this IC, the built-in soft-start circuit controls the rush current and overshoot of the output voltage when powering on or when the OFFON/ pin is switched to the “H” level. A reference voltage adjustment method is adopted as the soft-start me thod. The following describes the soft-start function. The raising of the output voltage is controlled by slowly raising the reference voltage of the error amplifier input from 0 V at power on as shown in Figure 7 . The soft-start function is realized by controlling the voltage of the FB pin so that it is the same potential as the reference voltage that is slowly raised. A Rail-to-Rail amplifier is adopted as the error amplifier, which means that the voltage is loop controlled so that it can be the same as the reference voltage. The following explains the operation at power on (refer to Figure 8). When V IN is raised from 0 V to 3.3 V, the V OUT voltage rises to a value close to V IN via the inductor L and diode SD. This raises the voltage of the FB pin (V FB) by approximately 0.35 V (when RFB1 = 8.2 kΩ, RFB2 = 1.0 kΩ). Because the reference vo ltage rises from 0 V, the V FB voltage is higher than the reference voltage while the voltage rises from 0 V to 0. 35 V. During this period, the EXT output is low. The EXT output is in the stepped-up status between high and low after the reference voltage reaches 0.35 V and V OUT is slowly raised in accordance with the rising of the reference voltage. Once the reference voltage rises, the voltage cannot be reset (the reference voltage is 0 V) unless the power supply voltage is the UVLO detection voltage or lower or the shutdown pin is the “L” level. Conversely, when the power supply voltage rises up to the reset voltage after it is lowered to the UVLO detection voltage or lower, the output voltage is stepped up by the soft-start function. PWM Comparator VOUT RFB2 RFB1 FB SD L VIN EXT CC RZ CZ – CL Error amplifier Vref 0.5 V 0 V – Error amplifier reference voltage Figure 7

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 (VIN = 0 V→3.3 V, VOUT = 9.2 V, RFB1 = 8.2 kΩ, RFB2 = 1.0 kΩ) 0.3 V 0 V Input voltage (VIN) 3.3 V 0 V Output volt age (VOUT) 9.2 V 0 V Error amplifier reference voltage 1.0 V 0 V FB pin voltage (VFB) 1.0 V 0 V EXT pin voltage (VEX T) 4.0 V t (ms) 0.35 V 2.9 V tSS VOUT × 0.95 V Figure 8

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series 3. Shutdown pin (S-8338 Series only) This pin stops or starts step-up operations. Switching the shutdown pin to the “L” level stops oper ation of all the internal circuits and reduces the current consumpti on significantly. DO NOT use the shutdown pin in a floating state becau se it is not pulled up or pulled down internally. DO NOT apply voltage of between 0.3 V and 1.8 V to the shutdown pin because applying such a voltage increases the current consumpt ion. If the shutdown pin is not used, connect it to the VIN pin. Table 7 Shutdown Pin CR Oscillator Output Voltage “H” Operates Fixed “L” Stopped ≅ VIN*1 *1. Voltage of V IN from which the voltage drop from the DC resistance of the inductor and the forward voltage of the diode are subtracted ON/OFF VIN VSS Figure 9 4. Timer latch short-circuit protection function This IC has a timer latch short- circuit protection circuit that st ops the switching operation when the output voltage drops for a specific time due to output short-circuiting. A capacit or (CSP) that is used to set the delay time of this short-circuit protection circuit is connected to the CSP pin. This IC operates at the maximum duty ratio if the ou tput voltage drops due to output short-circuiting. At the maximum duty ratio, constant-current charging of CSP starts. If this status lasts for a specific time and the CSP pin voltage rises above the reference voltage (1 V), the latch mode is set. Note that the latch mode is different from the shutdown status in that the switching operation is stopped but the internal circuitry operates normally. To reset the latch operation to protect the IC from short-circuiting, either lower V IN to the timer latch reset voltage or lower or lower the level of the shutdow n pin to “L”. Note that the latch operation is not reset even if V IN falls below the UVLO voltage. 5. UVLO function This IC includes a UVLO (under-voltage lockout) circ uit to prevent the IC from malfunctioning due to a transient status when power is applied or a moment ary drop of the supply voltage. When UVLO is in the detection state, switching is stopped and the external FET is held in the off status. Once UVLO enters the detection state, the soft-start function is reset. Note that the other internal circui ts operate normally and that the status is different from the power-off status.

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series Change in current (I L) flowing through the diode into V OUT during tOFF: L VVV L V dt dl INDOUTLL −+== Integration of the above equation is as follows: tL VVVII INDOUT PKL •  −+−= During tON, energy is stored in L and is not transmitted to V OUT. When receiving output current (I OUT) from VOUT, the energy of the capacitor (C L) is used. As a result, the pin voltage of C L is reduced, and goes to the lowest level after M1 is turned ON (t ON). When M1 is turned OFF, the energy stored in L is transmitted via the diode to C L, and the pin voltage of C L rises drastically. Because V OUT is a time function indicating the maximum value (ripple voltage: V p-p) when the current flowing through the diode into VOUT and the load current I OUT match. Next, this ripple voltage is determined as follows. IOUT vs t1 (time) from when M1 is turned OFF (after t ON) to when VOUT reaches the maximum level: INDOUT PKOUT tL VVVII •  −+−= ()  −+•−=∴ INDOUT OUTPK1 VVV LIIt When M1 is turned ON (after t OFF), IL = 0 (when the energy of the inductor is completely transmitted): Based on equation (7), PK OFF INDOUT I t VVV L = When substituting equation (10) for equation (9): OFF PK OUT OFF1 tI Itt • −= Electrical charge ΔQ1 which is charged in C L during t1: INDOUT 1PK1t INDOUT1t 0PKL1t 01 t2 L VVVtItdtL ……….…...(12) When substituting equation (12) for equation (9): () 1 OUTPK 1OUTPKPK1 t2 IItII2 1IQ •+=•−−=Δ A rise voltage (V p-p) due to ΔQ1: OUTPK LL pp t2 II C C QV • When taking into consideration I OUT consumed during t 1 and ESR*1 (RESR) of CL: L 1OUT ESR OUTPK OUTPK LL pp C tIR2 IIt2 II C C QV •−•  ++• *1. Equivalent Series Resistance

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 When substituting equation (11) for equation (15): ESR OUTPK L OFF PK 2OUTPK pp R2 II C t IIV • Therefore to reduce the ripple voltage, it is import ant that the capacitor c onnected to the output pin has a large capacity and a small ESR.

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series  External Parts Selection 1. Inductor The inductance has a strong influence on the maximum output current (I OUT) and efficiency ( η). The peak current (I PK) increases by decreasing L and the st ability of the circuit improves and I OUT increases. If L is decreased further, the efficiency falls, and I OUT decreases if the current drive capability of the external transistor is insufficient. The loss of I PK by the switching transistor decreases by increasing L and the efficiency becomes maximum at a certain L value. Further increasi ng L decrease the efficiency due to the loss of the DC resistance of the inductor. I OUT also decreases. If the oscillation frequency is higher, a smaller L value can be chosen, making the inductor smaller. In the S-8337/8338 Series, the oscillation frequency can be varied within the range of 286 kHz to 1.133 MHz by the external resistor, so select an L value best suited to the frequency. The recommended value is between 2.2 μH and 22 μH. When selecting an inductor, note the allowable current of the inductor. If a current exceeding this allowable current flows through the inductor, magne tic saturation occurs, substantially lowering the efficiency and increasing the current, which results in damage to the IC. Therefore, select an inductor so that I PK does not exceed the allowable current. I PK is expressed by the following equations in the discont inuous mode and continuous mode. ) mode ousdiscontinu ( Lfosc )VV(VI 2I INDOUTOUT PK mode) s(continuou Lfosc)V(V2 V)VV(VIV VVI DOUT ININDOUT OUT IN DOUT PK

•+• fOSC = Oscillation frequency, V D ≅ 0.4 V. 2. Diode Use an external diode that meet s the following requirements.
Low forward voltage
High switching speed
Reverse breakdown voltage: V OUT + [Spike voltage] or more
Rated current: I PK or more 3. Capacitors (C IN, CL) The capacitor on the input side (C IN) can lower the supply impedance and level the input current for better efficiency. Select C IN according to the impedance of the power supply to be used. The capacitor on the output side (C L) is used to smooth the output voltage. Select an appropriate capacitance value based on the I/O conditions and load conditions. A capacitance of 10 μF or more is recommended. By adjusting the phase compensation of the feedback loop using the external resistor (RZ) and capacitor (CZ), a ceramic capacitor can be used as the capacitor on the output side. If a capacitor whose equivalent series resistance is between 30 mΩ and 500 mΩ is used as the output capacitor, the adjustable range of the phase compensation is wider; however, note that other characteristics may be affected by ripple voltage or other conditions at this time. The optimal capacitor differs depending on the L value, capacitance value, wiring, and applicat ion (output load), so select the capacitor after performing sufficient evaluation under the actual usage conditions.

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 4. External transistor A bipolar (NPN) or enhancement (N-channel) MOS FET transistor can be used as the external capacitor. 4. 1 Bipolar (NPN) type The driving capability when the output current is increased by using a bipolar transistor is determined by h FE and Rb of the bipolar transistor. Figure 11 shows a peripheral circuit. Nch Pch Rb VIN IPK EXT Cb 2200 pF 1 kΩ Figure 11 External Transistor Periphery 1 kΩ is recommended for R b. Actually, calculate the necessary base current (I b) from hFE of the bipolar transistor as follows and select an R b value lower than this. Ib = hFE IPK Rb = Ib VIN – 0.7 – IEXTH 0.4 A small Rb increases the output current, but the ef ficiency decreases. Actually, a pulsating current flows and a voltage drop occurs due to t he wiring capacitance. Determine the optimum value by experiment. A speed-up capacitor (C b) connected in parallel with R b resistance as shown in Figure 11 decreases the switching loss and improves the efficiency. Select Cb by observing the following equation. Cb ≤ 2π • Rb • fOSC • 0.7 However, in practice, the optimum C b value also varies depending on the characteristics of the bipolar transistor employed. Therefor e, determine the optimum value of C b by experiment.

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series 4. 2 Enhancement MOS FET type Use an Nch power MOS FET. For high efficiency, using a MOS FET with a low ON resistance (RON) and small input capacitance (C ISS) is ideal, however, ON resistance and input capacitance generally share a trade-off relationship. The ON resistance is efficient in a range in which the output current is relatively great during low- frequency switching, and the input capacitance is efficient in a range in which the output current is middling during high-frequency switching. Select a MOS FET whose ON resistance and input capacitance are optimal depending on the usage conditions. The input voltage (VIN) is supplied for the gate voltage of the MOS FET, so select a MOS FET with a gate withstanding voltage that is equal to the maximum usage value of the input voltage or higher and a drain withstanding voltage that is equal to the amount of the output voltage (V OUT) and diode voltage (V D) or higher. If a MOS FET with a threshold that is near the UVLO detection voltage is used, a large current may flow, stopping the output voltage from rising and possibly generating heat in the worst case. Select a MOS FET with a threshold that is su fficiently lower than the UVLO detection voltage value.

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series 6. Short-circuit protection delay time setting capacitor (CSP) With the S-8337/8338 Series, the short-circuit protec tion delay time can be set to any value by an external capacitor. Connect t he capacitor across the CSP and VSS pins . Select the capacitance by using the following equation and referring to Figure 14 . However, the following equation and figure assume that the capacitor value is the desired val ue and show the theoretical values when the IC is in the typical conditions. Note that fluctuati ons of capacitor and IC are not considered. CSP [μF] 1.0 tPRO [ms] • 2 • 10−3 ≅ 120 100 0 0.10 0.20 0.25 tPRO [ms] CSP [μF] 0.05 0.15 Figure 14 C SP vs. tPRO 7. Output voltage setting resistors (RFB1, RBF2) With the S-8337/8338 Series, the output voltage can be se t to any value by external divider resistors. Connect the divider resistors across the V OUT and VSS pins. Because V FB = 1 V, the output voltage can be calculated by this equation. = VOUT RFB2 (RFB1 + RFB2) Connect divider resistors RFB1 and RFB2 as close to the IC to minimize effects from of noise. If noise does have an effect, adjust the values of RFB1 and RFB2 so that R FB1 + RFB2 < 100 kΩ. CFB connected in parallel with RFB1 is a capacitor for phase compensation. Select the optimum value of this capacitor at which the stable operat ion can be ensured from the values of the inductor and output capacitor. 8. Phase compensation setting resistor and capacitor (RZ, CZ) The S-8337/8338 Series needs appropriate compensati on for the voltage feedback loop to prevent excessive output ripple and unstable operation from det eriorating the efficiency. This compensation is implemented by connecting RZ and CZ in series across the CC and VSS pins. RZ sets the high-frequency gain for a high-speed transient respons e. CZ sets the pole and zero of the error amplifier and keeps the loop stable. Adjust RZ and CZ, taking into consideration conditions such as the inductor, output capacitor, and load current, so th at the optimum transient characteristics can be obtained.

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series  Precaution

Mount external capacitors, diodes, and i nductor as close as possible to the IC.
Characteristics ripple voltage and spike noise occur in IC containing switching regulators. Moreover rush current flows at the time of a power supply injection. Because these largely depend on the inductor, the capacitor and impedance of power supply used, fu lly check them using an actually mounted model.
Make sure the dissipation of the switching transisto r (especially at a high temperature) does not exceed the allowable power dissipation of the package.
The performance of a switching regulator varies depending on the design of the PCB patterns, peripheral circuits, and external parts. Thor oughly test all settings with your device.
This IC builds in soft start function, starts refer ence voltage gradually, and it is controlled so that FB pin voltage and reference voltage become this potential. Therefore, keep in mind that it will be in a maximum duty state according to the factor of IC ex terior if FB pin voltage is held less than reference voltage.
Although the IC contains a static el ectricity protection circ uit, static electricity or voltage that exceeds the limit of the protection circuit should not be applied.
SII Semiconductor Corporation assumes no responsib ility for the way in which this IC is used on products created using this IC or for the specific ations of that product, nor does SII Semiconductor Corporation assume any responsibility for any infri ngement of patents or copy rights by products that include this IC either in Japan or in other countries.

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01  Characteristics (Typical Data) 1. Example of Major Temperature Characteristics (Ta = −40 to 85°C) ISS1 vs. Ta (VIN = 3.3 V) 700 600 500 400 300 200 100 −40 −20 0 20 40 60 80 100 Ta [°C] ISS1 [μA] fOSC = 1133 kHz (ROSC = 120 kΩ) fOSC = 700 kHz (ROSC = 200 kΩ) fOSC = 286 kHz (ROSC = 510 kΩ) ISSS vs. Ta (VIN = 3.3 V) 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 −40 −20 0 20 40 60 80 100 Ta [°C] I SSS [μA] fOSC = 700 kHz (ROSC = 200 kΩ) –200 –180 –160 –140 –120 –100 –80 –60 –40 –20 −40 −20 0 20 40 60 80 100 Ta [°C] I EXTH [mA] IEXTH vs. Ta (VIN = 3.3 V) fOSC = 700 kHz, MaxDuty = 77% (R OSC = 200 kΩ, RDuty = 300 kΩ) 200 180 160 140 120 100 −40 −20 0 20 40 60 80 100 Ta [°C] I EXTL [mA] IEXTL vs. Ta (VIN = 3.3 V) fOSC = 700 kHz, MaxDuty = 77% (R OSC = 200 kΩ, RDuty = 300 kΩ) 0.10 0.08 0.06 0.04 0.02 –0.02 –0.04 –0.06 –0.08 –0.10 −40 −20 0 20 40 60 80 100 Ta [°C] I FB [μA] IFB vs. Ta (VIN = 3.3 V) fOSC vs. Ta (VIN = 3.3 V) 1400 1200 1000 800 600 400 200 −40 −20 0 20 40 60 80 100 Ta [°C] fOSC [kHz] fOSC = 1133 kHz (ROSC = 120 kΩ) fOSC = 700 kHz (ROSC = 200 kΩ) fOSC = 286 kHz (ROSC = 510 kΩ)

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series 100 −40 −20 0 20 40 60 80 100 Ta [°C] MaxDuty [%] MaxDuty vs. Ta (VIN = 3.3 V) MaxDuty = 88.5% (R OSC = 200 kΩ, RDuty = 100 kΩ) MaxDuty = 77% (R OSC = 200 kΩ, RDuty = 300 kΩ) MaxDuty = 47% (R OSC = 200 kΩ, RDuty = 820 kΩ) tSS vs. Ta (VIN = 3.3 V) 25.0 20.0 15.0 10.0 5.0 −40 −20 0 20 40 60 80 100 Ta [°C] tSS [ms] tSS = 10 ms tSS = 20 ms 70.0 60.0 50.0 40.0 30.0 20.0 10.0 −40 −20 0 20 40 60 80 100 Ta [°C] t PRO [ms] tPRO vs. Ta (VIN = 3.3 V) tPRO = 50 ms (CSP = 0.1 μF) VUVLO vs. Ta 2.5 2.0 1.5 1.0 0.5 −40 −20 0 20 40 60 80 100 Ta [°C] VUVLO [V] VUVLO = 2.3 V VUVLO = 1.5 V 0.35 0.30 0.25 0.20 0.15 0.10 0.05 −40 −20 0 20 40 60 80 100 Ta [°C] VUVLOHYS [V] VUVLOHYS vs. Ta VUVLOHYS = 0.3 V VUVLOHYS = 0.1 V –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 −40 −20 0 20 40 60 80 100 Ta [°C] I CCH [μA] ICCH vs. Ta (VIN = 3.3 V) 100 −40 −20 0 20 40 60 80 100 Ta [°C] I CCL [μA] ICCL vs. Ta (VIN = 3.3 V) 1.2 1.0 0.8 0.6 0.4 0.2 −40 −20 0 20 40 60 80 100 Ta [°C] V RTLT [V] VRTLT vs. Ta (VIN = 3.3 V)

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 −40 −20 0 20 40 60 80 100 Ta [°C] V SH [V] VSH vs. Ta (VIN = 3.3 V) 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 −40 −20 0 20 40 60 80 100 Ta [°C] V SL [V] VSL vs. Ta (VIN = 3.3 V) 0.1 –0.1 −40 −20 0 20 40 60 80 100 Ta [°C] ISH [μA] ISH vs. Ta (VIN = 3.3 V) 0.1 –0.1 −40 −20 0 20 40 60 80 100 Ta [°C] ISL [μA] ISL vs. Ta (VIN = 3.3 V)

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series 2. Example of Major Power Supply Dependence Characteristics (Ta = 25°C) ISS1 vs. VIN 1200 1000 800 600 400 200 0 1 2 3 4 5 6 7 V IN [V] ISS1 [μA] fOSC = 1133 kHz (ROSC = 120 kΩ) fOSC = 700 kHz (ROSC = 200 kΩ) fOSC = 286 kHz (ROSC = 510 kΩ) ISSS vs. VIN 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 I SSS [μA] fOSC = 700 kHz (ROSC = 200 kΩ) 01 2 3 4 5 6 7 VIN [V] –200 –180 –160 –140 –120 –100 –80 –60 –40 –20 I EXTH [mA] IEXTH vs. VIN 0 1 2 3 4 5 6 7 VIN [V] fOSC = 700 kHz, MaxDuty = 77% (R OSC = 200 kΩ, RDuty = 300 kΩ) 200 180 160 140 120 100 I EXTL [mA] IEXTL vs. VIN fOSC = 700 kHz, MaxDuty = 77% (R OSC = 200 kΩ, RDuty = 300 kΩ) 01 2 3 4 5 6 7 VIN [V] 0.10 0.08 0.06 0.04 0.02 –0.02 –0.04 –0.06 –0.08 –0.10 I FB [μA] IFB vs. VIN 0 1 2 3 4 5 6 7 VIN [V] fOSC vs. VIN 1400 1200 1000 800 600 400 200 fOSC [kHz] 01 2 3 4 5 6 7 VIN [V] fOSC = 1133 kHz (ROSC = 120 kΩ) fOSC = 700 kHz (ROSC = 200 kΩ) fOSC = 286 kHz (ROSC = 510 kΩ) 100 MaxDuty [%] MaxDuty vs. VIN 0 1 2 3 4 5 6 7 VIN [V] MaxDuty = 88.5% MaxDuty = 47% MaxDuty = 77% (ROSC = 200 kΩ, RDuty = 100 kΩ) (ROSC = 200 kΩ, RDuty = 300 kΩ) (ROSC = 200 kΩ, RDuty = 820 kΩ) tSS vs. VIN 25.0 20.0 15.0 10.0 5.0 tSS [ms] 01 2 3 4 5 6 7 VIN [V] tSS = 10 ms tSS = 20 ms

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 70.0 60.0 50.0 40.0 30.0 20.0 10.0 t PRO [ms] tPRO vs. VIN 0 1 2 3 4 5 6 7 VIN [V] tPRO = 50 ms (CSP = 0.1 μF) –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 I CCH [μA] ICCH vs. VIN 01 2 3 4 5 6 7 VIN [V] 100 I CCL [μA] ICCL vs. VIN 0 1 2 3 4 5 6 7 VIN [V] 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 V SH [V] VSH vs. VIN 01 2 3 4 5 6 7 VIN [V] 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 V SL [V] VSL vs. VIN 0 1 2 3 4 5 6 7 VIN [V] 0.1 –0.1 ISH [μA] ISH vs. VIN 01 2 3 4 5 6 7 VIN [V] 0.1 –0.1 ISL [μA] ISL vs. VIN 0 1 2 3 4 5 6 7 VIN [V]

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series 3. Example of External Parts Dependence Characteristics fOSC vs. ROSC (VIN = 3.3 V) 1600 1400 1200 1000 800 600 400 200 0 100 200 300 400 500 600 R OSC [kΩ] fOSC [kHz] Ta = –40°C Ta = 25°C Ta = 85°C fOSC vs. ROSC (VIN = 5.0 V) 1600 1400 1200 1000 800 600 400 200 0 100 200 300 400 500 600 R OSC [kΩ] fOSC [kHz] Ta = –40°C Ta = 25°C Ta = 85°C 100 MaxDuty [%] MaxDuty vs. R Duty/ROSC (ROSC = 200 kΩ, VIN = 3.3 V) 0 0.5 1 1.5 2 2.5 3 3.5 RDuty/ROSC 4 4.5 5 Ta = –40°C Ta = 25°C Ta = 85°C 100 MaxDuty [%] MaxDuty vs. R Duty/ROSC (ROSC = 200 kΩ, VIN = 5.0 V) 00 . 5 1 1.5 2 2.5 3 3.5 RDuty/ROSC 4 4.5 5 Ta = –40°C Ta = 25°C Ta = 85°C tPRO vs. CSP (VIN = 3.3 V) 350 300 250 200 150 100 CSP [μF] tPRO [ms] Ta = –40°C Ta = 25°C Ta = 85°C tPRO vs. CSP (VIN = 5.0 V) 350 300 250 200 150 100 CSP [μF] tPRO [ms] Ta = –40°C Ta = 25°C Ta = 85°C

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 4. Examples of Transient Response Characteristics 4. 1 Powering ON (V OUT = 9.2 V, VIN = 0 V→3.3 V, Ta = 25°C) (1) fOSC = 1133 kHz, I OUT = 0 mA, tSS = 10 ms (2) f OSC = 1133 kHz, I OUT = 100 mA, t SS = 10 ms –5 0 5 10 15 20 time [ms] VIN [V]

8 VOUT

[V] –5 0 5 10 15 20 time [ms] VIN [V] [V] (3) fOSC = 700 kHz, I OUT = 0 mA, tSS = 10 ms (4) f OSC = 700 kHz, I OUT = 100 mA, t SS = 10 ms –5 0 5 10 15 20 time [ms] VIN [V] [V] –5 0 5 10 15 20 time [ms] VIN [V] [V] (5) fOSC = 286 kHz, I OUT = 0 mA, tSS = 10 ms (6) f OSC = 286 kHz, I OUT = 100 mA, t SS = 10 ms –5 0 5 10 15 20 time [ms] VIN [V] [V] –5 0 5 10 15 20 time [ms] VIN [V] [V]

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series 4. 2 Responses of shutdown pin (V OUT = 9.2 V, VON/OFF = 0 V→3.3 V) (1) fOSC = 1133 kHz, I OUT = 0 mA, tSS = 10 ms (2) f OSC = 1133 kHz, I OUT = 100 mA, t SS = 10 ms –5 0 5 10 15 20 time [ms] [V] VON/OFF [V] –5 0 5 10 15 20 time [ms] [V] VON/OFF [V] (3) fOSC = 700 kHz, I OUT = 0 mA, tSS = 10 ms (4) f OSC = 700 kHz, I OUT = 100 mA, t SS = 10 ms –5 0 5 10 15 20 time [ms] [V] VON/OFF [V] –5 0 5 10 15 20 time [ms] [V] VON/OFF [V] (5) fOSC = 286 kHz, I OUT = 0 mA, tSS = 10 ms (6) f OSC = 286 kHz, I OUT = 100 mA, t SS = 10 ms –5 0 5 10 15 20 time [ms] [V] VON/OFF [V] –5 0 5 10 15 20 time [ms] [V] VON/OFF [V]

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 4. 3 Load fluctuations (V OUT = 9.2 V, VIN = 3.3 V, Ta = 25°C, RZ = 200 kΩ, CZ = 0.01 μF) (1) fOSC = 1133 kHz, I OUT = 0.1 mA→100 mA (2) f OSC = 1133 kHz, I OUT = 100 mA→0.1 mA –20 –10 0 10 20 time [ms] 8.8 9.0 VOUT [0.2 V/div] 9.2 IOUT 100 mA 0.1 mA 9.4 9.6 9.8 10.0 –20 –10 0 10 20 time [ms] 8.8 9.0 VOUT [0.2 V/div] 9.2 IOUT 100 mA 0.1 mA 9.4 9.6 9.8 10.0 (3) fOSC = 700 kHz, I OUT = 0.1 mA→100 mA (4) f OSC = 700 kHz, I OUT = 100 mA→0.1 mA –20 –10 0 10 20 time [ms] 8.8 9.0 VOUT [0.2 V/div] 9.2 IOUT 100 mA 0.1 mA 9.4 9.6 9.8 10.0 –20 –10 0 10 20 time [ms] 8.8 9.0 VOUT [0.2 V/div] 9.2 IOUT 100 mA 0.1 mA 9.4 9.6 9.8 10.0 (5) fOSC = 286 kHz, I OUT = 0.1 mA→100 mA (6) f OSC = 286 kHz, I OUT = 100 mA→0.1 mA –20 –10 0 10 20 time [ms] 8.8 9.0 VOUT [0.2 V/div] 9.2 IOUT 100 mA 0.1 mA 9.4 9.6 9.8 10.0 –20 –10 0 10 20 time [ms] 8.8 9.0 VOUT [0.2 V/div] 9.2 IOUT 100 mA 0.1 mA 9.4 9.6 9.8 10.0

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series 4. 4 Input voltage fluctuations (V OUT = 9.2 V, IOUT = 100 mA, R Z = 200 kΩ, CZ = 0.01 μF) (1) fOSC = 1133 kHz, V IN = 2.7 V→3.7 V (2) f OSC = 1133 kHz, V IN = 3.7 V→2.7 V –20 –10 0 10 20 time [ms] 9.15 VOUT [V] 9.20 VIN [V] 4.0 3.5 3.0 2.5 9.25 9.30 –20 –10 0 10 20 time [ms] 9.15 VOUT [V] 9.20 VIN [V] 4.0 3.5 3.0 2.5 9.25 9.30 (3) fOSC = 700 kHz, V IN = 2.7 V→3.7 V (4) f OSC = 700 kHz, V IN = 3.7 V→2.7 V –20 –10 0 10 20 time [ms] 9.15 VOUT [V] 9.20 VIN [V] 4.0 3.5 3.0 2.5 9.25 9.30 –20 –10 0 10 20 time [ms] 9.15 VOUT [V] 9.20 VIN [V] 4.0 3.5 3.0 2.5 9.25 9.30 (5) fOSC = 286 kHz, V IN = 2.7 V→3.7 V (6) f OSC = 286 kHz, V IN = 3.7 V→2.7 V –20 –10 0 10 20 time [ms] 9.15 VOUT [V] 9.20 VIN [V] 4.0 3.5 3.0 2.5 9.25 9.30 –20 –10 0 10 20 time [ms] 9.15 VOUT [V] 9.20 VIN [V] 4.0 3.5 3.0 2.5 9.25 9.30

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01  Reference Data 1. Reference data for external parts Table 8 Properties of External Parts Element Name Product Name Manufacture Characteristics Inductor LDR655312T TDK Corporation 4.7 μH, DCR*1 = 206 mΩ, IMAX*2 = 0.9 A, Height = 1.2 mm Diode RB491D Rohm Co., Ltd. VF*3 = 0.45 V, I F*4 = 1.0 A Output capacitor ⎯ ⎯ 16 V, 10 μF Transistor MCH3406 Sanyo Electric Co., Ltd. VDSS*5 = 20 V, V GSS*6 = ±10 V, Ciss*7 = 280 pF, RDS(ON)*8 = 82 mΩ max. (VGS*9 = 2.5 V, I D*10 = 1 A) *1. DCR : DC resistance *2. IMAX : Maximum allowable current *3. VF : Forward voltage *4. IF : Forward current *5. VDSS : Drain to source voltage (When between gate and source short circuits) *6. VGSS : Gate to source voltage (When between drain and source short circuits) *7. Ciss : Input capacitance *8. RDS(ON) : Drain to source on resistance *9. VGS : Gate to source voltage *10. ID : Drain current Caution The values shown in the characteristics column of Table 8 above are based on the materials provided by each manufacturer. However, consider the characteristics of the original materials when using the above products.

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series 2. Reference data (1) The data of (a) output current (I OUT) vs. efficiency ( η) characteristics and (b) output current (I OUT) vs. output voltage (V OUT) characteristics is shown below. 2. 1 VOUT = 13.1 V (R FB1 = 7.5 kΩ, RFB2 = 620 Ω) (1) fOSC = 1133 kHz, MaxDuty = 77 % (R OSC = 120 kΩ, RDuty = 180 kΩ) (a) IOUT vs. η (b) I OUT vs. VOUT 100 1 10 100 10000.1 η [%] IOUT [mA] 0.01 VIN = 5.0 V 13.20 13.15 13.10 13.05 13.00 12.95 12.90 V OUT [V] 1 10 100 10000.1 IOUT [mA] 0.01 VIN = 5.0 V (2) fOSC = 700 kHz, MaxDuty = 77 % (R OSC = 200 kΩ, RDuty = 300 kΩ) (a) IOUT vs. η (b) I OUT vs. VOUT 100 1 10 100 10000.1 η [%] I OUT [mA] 0.01 VIN = 5.0 V 13.20 13.15 13.10 13.05 13.00 12.95 12.90 V OUT [V] 1 10 100 10000.1 IOUT [mA] 0.01 VIN = 5.0 V (3) fOSC = 286 kHz, MaxDuty = 77 % (R OSC = 510 kΩ, RDuty = 750 kΩ) (a) IOUT vs. η (b) I OUT vs. VOUT 100 1 10 100 10000.1 η [%] IOUT [mA] 0.01 VIN = 5.0 V 13.20 13.15 13.10 13.05 13.00 12.95 12.90 V OUT [V] 1 10 100 10000.1 IOUT [mA] 0.01 VIN = 5.0 V

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 2. 2 VOUT = 9.2 V (RFB1 = 8.2 kΩ, RFB2 = 1.0 kΩ) (1) fOSC = 1133 kHz, MaxDuty = 77 % (R OSC = 120 kΩ, RDuty = 180 kΩ) (a) IOUT vs. η (b) I OUT vs. VOUT 100 1 10 100 10000.1 η [%] IOUT [mA] 0.01 VIN = 5.0 V VIN = 3.3 V 9.30 9.25 9.20 9.15 9.10 9.05 9.00 V OUT [V] 1 10 100 10000.1 IOUT [mA] 0.01 VIN = 5.0 V VIN = 3.3 V (2) fOSC = 700 kHz, MaxDuty = 77 % (R OSC = 200 kΩ, RDuty = 300 kΩ) (a) IOUT vs. η (b) I OUT vs. VOUT 100 1 10 100 10000.1 η [%] IOUT [mA] 0.01 VIN = 5.0 V VIN = 3.3 V 9.30 9.25 9.20 9.15 9.10 9.05 9.00 V OUT [V] 1 10 100 10000.1 IOUT [mA] 0.01 VIN = 5.0 V VIN = 3.3 V (3) fOSC = 286 kHz, MaxDuty = 77 % (R OSC = 510 kΩ, RDuty = 750 kΩ) (a) IOUT vs. η (b) I OUT vs. VOUT 100 1 10 100 10000.1 η [%] IOUT [mA] 0.01 VIN = 5.0 V VIN = 3.3 V 9.30 9.25 9.20 9.15 9.10 9.05 9.00 V OUT [V] 1 10 100 10000.1 IOUT [mA] 0.01 VIN = 5.0 V VIN = 3.3 V

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series 2. 3 VOUT = 6.1 V (RFB1 = 5.1 kΩ, RFB2 = 1.0 kΩ) (1) fOSC = 1133 kHz, MaxDuty = 77 % (R OSC = 120 kΩ, RDuty = 180 kΩ) (a) IOUT vs. η (b) I OUT vs. VOUT 100 1 10 100 10000.1 η [%] IOUT [mA] 0.01 VIN = 3.3 V VIN = 1.8 V 6.20 6.15 6.10 6.05 6.00 5.95 5.90 V OUT [V] 1 10 100 10000.1 IOUT [mA] 0.01 VIN = 3.3 V VIN = 1.8 V (2) fOSC = 700 kHz, MaxDuty = 77 % (R OSC = 200 kΩ, RDuty = 300 kΩ) (a) IOUT vs. η (b) I OUT vs. VOUT 100 1 10 100 10000.1 η [%] IOUT [mA] 0.01 VIN = 3.3 V VIN = 1.8 V 6.20 6.15 6.10 6.05 6.00 5.95 5.90 V OUT [V] 1 10 100 10000.1 IOUT [mA] 0.01 VIN = 3.3 V VIN = 1.8 V (3) fOSC = 286 kHz, MaxDuty = 77 % (R OSC = 510 kΩ, RDuty = 750 kΩ) (a) IOUT vs. η (b) I OUT vs. VOUT 100 1 10 100 10000.1 η [%] I OUT [mA] 0.01 VIN = 3.3 V VIN = 1.8 V 6.20 6.15 6.10 6.05 6.00 5.95 5.90 V OUT [V] 1 10 100 10000.1 IOUT [mA] 0.01 VIN = 3.3 V VIN = 1.8 V

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 3. Reference data (2) The data of output current (I OUT) vs. ripple voltage (Vr) characteristics is shown below. 3. 1 VOUT = 13.1 V (R FB1 = 7.5 kΩ, RFB2 = 620 Ω) (1) fOSC = 1133 kHz, MaxDuty = 77 % (R OSC = 120 kΩ, RDuty = 180 kΩ) (2) fOSC = 700 kHz, MaxDuty = 77 % (R OSC = 200 k Ω, RDuty = 300 k Ω) 100 1 10 100 10000.1 Vr [mV] IOUT [mA] 0.01 VIN = 5.0 V 100 1 10 100 10000.1 Vr [mV] IOUT [mA] 0.01 VIN = 5.0 V (3) fOSC = 286 kHz, MaxDuty = 77 % (R OSC = 510 k Ω, RDuty = 750 k Ω) 100 1 10 100 10000.1 Vr [mV] IOUT [mA] 0.01 VIN = 5.0 V 3. 2 VOUT = 9.2 V (RFB1 = 8.2 kΩ, RFB2 = 1.0 kΩ) (1) fOSC = 1133 kHz, MaxDuty = 77 % (R OSC = 120 kΩ, RDuty = 180 kΩ) (2) fOSC = 700 kHz, MaxDuty = 77 % (R OSC = 200 k Ω, RDuty = 300 k Ω) 100 1 10 100 10000.1 Vr [mV] IOUT [mA] 0.01 VIN = 5.0 V VIN = 3.3 V 100 1 10 100 10000.1 Vr [mV] IOUT [mA] 0.01 VIN = 5.0 V VIN = 3.3 V (3) fOSC = 286 kHz, MaxDuty = 77 % (R OSC = 510 k Ω, RDuty = 750 k Ω) 100 1 10 100 10000.1 Vr [mV] IOUT [mA] 0.01 VIN = 5.0 V VIN = 3.3 V

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series 3. 3 VOUT = 6.1 V (RFB1 = 5.1 kΩ, RFB2 = 1.0 kΩ) (1) fOSC = 1133 kHz, MaxDuty = 77 % (R OSC = 120 kΩ, RDuty = 180 kΩ) (2) fOSC = 700 kHz, MaxDuty = 77 % (R OSC = 200 k Ω, RDuty = 300 k Ω) 100 1 10 100 10000.1 Vr [mV] IOUT [mA] 0.01 VIN = 3.3 V VIN = 1.8 V 100 1 10 100 10000.1 Vr [mV] IOUT [mA] 0.01 VIN = 3.3 V VIN = 1.8 V (3) fOSC = 286 kHz, MaxDuty = 77 % (R OSC = 510 k Ω, RDuty = 750 k Ω) 100 1 10 100 10000.1 Vr [mV] IOUT [mA] 0.01 VIN = 3.3 V VIN = 1.8 V

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01  Marking Specification (1) 8-Pin SON(A) 8-Pin SON(A) Top view (1) (2) (3) (5) (6) (7) (4) (8) (1) ~ (3) Product code (Refer to Product name vs. Product code ) (4) ~ (8) Lot number Product name vs. Product code (a) S-8337Series Product name Product code Product name Product code S-8337AAAA-P8T1G O B A S-8337ABEC-P8T1G O D N S-8337AAAB-P8T1G O B B S-8337ABFA-P8T1G O D O S-8337AAAC-P8T1G O B 2 S-8337ABFB-P8T1G O D P S-8337AABA-P8T1G O B C S-8337ABFC-P8T1G O D Q S-8337AABB-P8T1G O B D S-8337ABGA-P8T1G O D R S-8337AABC-P8T1G O B E S-8337ABGB-P8T1G O D S S-8337AACA-P8T1G O B F S-8337ABGC-P8T1G O D T S-8337AACB-P8T1G O B G S-8337ABHA-P8T1G O D U S-8337AACC-P8T1G O B H S-8337ABHB-P8T1G O D V S-8337AADA-P8T1G O B I S-8337ABHC-P8T1G O D W S-8337AADB-P8T1G O B J S-8337ABIA-P8T1G O D X S-8337AADC-P8T1G O B K S-8337ABIB-P8T1G O D Y S-8337AAEA-P8T1G O B L S-8337ABIC-P8T1G O D Z S-8337AAEB-P8T1G O B M S-8337ACAA-P8T1G O J A S-8337AAEC-P8T1G O B N S-8337ACAB-P8T1G O J B S-8337AAFA-P8T1G O B O S-8337ACAC-P8T1G O J 2 S-8337AAFB-P8T1G O B P S-8337ACBA-P8T1G O J C S-8337AAFC-P8T1G O B Q S-8337ACBB-P8T1G O J D S-8337AAGA-P8T1G O B R S-8337ACBC-P8T1G O J E S-8337AAGB-P8T1G O B S S-8337ACCA-P8T1G O J F S-8337AAGC-P8T1G O B T S-8337ACCB-P8T1G O J G S-8337AAHA-P8T1G O B U S-8337ACCC-P8T1G O J H S-8337AAHB-P8T1G O B V S-8337ACDA-P8T1G O J I S-8337AAHC-P8T1G O B W S-8337ACDB-P8T1G O J J S-8337AAIA-P8T1G O B X S-8337ACDC-P8T1G O J K S-8337AAIB-P8T1G O B Y S-8337ACEA-P8T1G O J L S-8337AAIC-P8T1G O B Z S-8337ACEB-P8T1G O J M S-8337ABAA-P8T1G O D A S-8337ACEC-P8T1G O J N S-8337ABAB-P8T1G O D B S-8337ACFA-P8T1G O J O S-8337ABAC-P8T1G O D 2 S-8337ACFB-P8T1G O J P S-8337ABBA-P8T1G O D C S-8337ACFC-P8T1G O J Q S-8337ABBB-P8T1G O D D S-8337ACGA-P8T1G O J R S-8337ABBC-P8T1G O D E S-8337ACGB-P8T1G O J S S-8337ABCA-P8T1G O D F S-8337ACGC-P8T1G O J T S-8337ABCB-P8T1G O D G S-8337ACHA-P8T1G O J U S-8337ABCC-P8T1G O D H S-8337ACHB-P8T1G O J V S-8337ABDA-P8T1G O D I S-8337ACHC-P8T1G O J W S-8337ABDB-P8T1G O D J S-8337ACIA-P8T1G O J X S-8337ABDC-P8T1G O D K S-8337ACIB-P8T1G O J Y S-8337ABEA-P8T1G O D L S-8337ACIC-P8T1G O J Z S-8337ABEB-P8T1G O D M

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series (b) S-8338 Series Product name Product code Product name Product code S-8338AAAA-P8T1G O C A S-8338ABEC-P8T1G O I N S-8338AAAB-P8T1G O C B S-8338ABFA-P8T1G O I O S-8338AAAC-P8T1G O C 2 S-8338ABFB-P8T1G O I P S-8338AABA-P8T1G O C C S-8338ABFC-P8T1G O I Q S-8338AABB-P8T1G O C D S-8338ABGA-P8T1G O I R S-8338AABC-P8T1G O C E S-8338ABGB-P8T1G O I S S-8338AACA-P8T1G O C F S-8338ABGC-P8T1G O I T S-8338AACB-P8T1G O C G S-8338ABHA-P8T1G O I U S-8338AACC-P8T1G O C H S-8338ABHB-P8T1G O I V S-8338AADA-P8T1G O C I S-8338ABHC-P8T1G O I W S-8338AADB-P8T1G O C J S-8338ABIA-P8T1G O I X S-8338AADC-P8T1G O C K S-8338ABIB-P8T1G O I Y S-8338AAEA-P8T1G O C L S-8338ABIC-P8T1G O I Z S-8338AAEB-P8T1G O C M S-8338ACAA-P8T1G O K A S-8338AAEC-P8T1G O C N S-8338ACAB-P8T1G O K B S-8338AAFA-P8T1G O C O S-8338ACAC-P8T1G O K 2 S-8338AAFB-P8T1G O C P S-8338ACBA-P8T1G O K C S-8338AAFC-P8T1G O C Q S-8338ACBB-P8T1G O K D S-8338AAGA-P8T1G O C R S-8338ACBC-P8T1G O K E S-8338AAGB-P8T1G O C S S-8338ACCA-P8T1G O K F S-8338AAGC-P8T1G O C T S-8338ACCB-P8T1G O K G S-8338AAHA-P8T1G O C U S-8338ACCC-P8T1G O K H S-8338AAHB-P8T1G O C V S-8338ACDA-P8T1G O K I S-8338AAHC-P8T1G O C W S-8338ACDB-P8T1G O K J S-8338AAIA-P8T1G O C X S-8338ACDC-P8T1G O K K S-8338AAIB-P8T1G O C Y S-8338ACEA-P8T1G O K L S-8338AAIC-P8T1G O C Z S-8338ACEB-P8T1G O K M S-8338ABAA-P8T1G O I A S-8338ACEC-P8T1G O K N S-8338ABAB-P8T1G O I B S-8338ACFA-P8T1G O K O S-8338ABAC-P8T1G O I 2 S-8338ACFB-P8T1G O K P S-8338ABBA-P8T1G O I C S-8338ACFC-P8T1G O K Q S-8338ABBB-P8T1G O I D S-8338ACGA-P8T1G O K R S-8338ABBC-P8T1G O I E S-8338ACGB-P8T1G O K S S-8338ABCA-P8T1G O I F S-8338ACGC-P8T1G O K T S-8338ABCB-P8T1G O I G S-8338ACHA-P8T1G O K U S-8338ABCC-P8T1G O I H S-8338ACHB-P8T1G O K V S-8338ABDA-P8T1G O I I S-8338ACHC-P8T1G O K W S-8338ABDB-P8T1G O I J S-8338ACIA-P8T1G O K X S-8338ABDC-P8T1G O I K S-8338ACIB-P8T1G O K Y S-8338ABEA-P8T1G O I L S-8338ACIC-P8T1G O K Z S-8338ABEB-P8T1G O I M

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8337/8338 Series Rev.4.0_01 (2) 8-Pin TSSOP 8-Pin TSSOP Top view (1) (2) (3) (4) (5) (6) (7) (8) (1) ~ (4) Product name: 8337 or 8338 (Fixed) 8337 indicates S-8337 series. 8338 indicates S-8338 series. (5) ~ (8) Function code (Refer to Product name vs. Function code ) (9) ~ (14) Lot number Product name vs. Function code (a) S-8337 Series Product name Function code Product name Function code S-8337AAAA-T8T1x A A A A S-8337ABEC-T8T1x A B E C S-8337AAAB-T8T1x A A A B S-8337ABFA-T8T1x A B F A S-8337AAAC-T8T1x A A A C S-8337ABFB-T8T1x A B F B S-8337AABA-T8T1x A A B A S-8337ABFC-T8T1x A B F C S-8337AABB-T8T1x A A B B S-8337ABGA-T8T1x A B G A S-8337AABC-T8T1x A A B C S-8337ABGB-T8T1x A B G B S-8337AACA-T8T1x A A C A S-8337ABGC-T8T1x A B G C S-8337AACB-T8T1x A A C B S-8337ABHA-T8T1x A B H A S-8337AACC-T8T1x A A C C S-8337ABHB-T8T1x A B H B S-8337AADA-T8T1x A A D A S-8337ABHC-T8T1x A B H C S-8337AADB-T8T1x A A D B S-8337ABIA-T8T1x A B I A S-8337AADC-T8T1x A A D C S-8337ABIB-T8T1x A B I B S-8337AAEA-T8T1x A A E A S-8337ABIC-T8T1x A B I C S-8337AAEB-T8T1x A A E B S-8337ACAA-T8T1x A C A A S-8337AAEC-T8T1x A A E C S-8337ACAB-T8T1x A C A B S-8337AAFA-T8T1x A A F A S-8337ACAC-T8T1x A C A C S-8337AAFB-T8T1x A A F B S-8337ACBA-T8T1x A C B A S-8337AAFC-T8T1x A A F C S-8337ACBB-T8T1x A C B B S-8337AAGA-T8T1x A A G A S-8337ACBC-T8T1x A C B C S-8337AAGB-T8T1x A A G B S-8337ACCA-T8T1x A C C A S-8337AAGC-T8T1x A A G C S-8337ACCB-T8T1x A C C B S-8337AAHA-T8T1x A A H A S-8337ACCC-T8T1x A C C C S-8337AAHB-T8T1x A A H B S-8337ACDA-T8T1x A C D A S-8337AAHC-T8T1x A A H C S-8337ACDB-T8T1x A C D B S-8337AAIA-T8T1x A A I A S-8337ACDC-T8T1x A C D C S-8337AAIB-T8T1x A A I B S-8337ACEA-T8T1x A C E A S-8337AAIC-T8T1x A A I C S-8337ACEB-T8T1x A C E B S-8337ABAA-T8T1x A B A A S-8337ACEC-T8T1x A C E C S-8337ABAB-T8T1x A B A B S-8337ACFA-T8T1x A C F A S-8337ABAC-T8T1x A B A C S-8337ACFB-T8T1x A C F B S-8337ABBA-T8T1x A B B A S-8337ACFC-T8T1x A C F C S-8337ABBB-T8T1x A B B B S-8337ACGA-T8T1x A C G A S-8337ABBC-T8T1x A B B C S-8337ACGB-T8T1x A C G B S-8337ABCA-T8T1x A B C A S-8337ACGC-T8T1x A C G C S-8337ABCB-T8T1x A B C B S-8337ACHA-T8T1x A C H A S-8337ABCC-T8T1x A B C C S-8337ACHB-T8T1x A C H B S-8337ABDA-T8T1x A B D A S-8337ACHC-T8T1x A C H C S-8337ABDB-T8T1x A B D B S-8337ACIA-T8T1x A C I A S-8337ABDC-T8T1x A B D C S-8337ACIB-T8T1x A C I B S-8337ABEA-T8T1x A B E A S-8337ACIC-T8T1x A C I C S-8337ABEB-T8T1x A B E B Remark 1. x: G or U 2. Please select products of environmental code = U for Sn 100%, halogen-free products.

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8337/8338 Series (b) S-8338 Series Product name Function code Product name Function code S-8338AAAA-T8T1x A A A A S-8338ABEC-T8T1x A B E C S-8338AAAB-T8T1x A A A B S-8338ABFA-T8T1x A B F A S-8338AAAC-T8T1x A A A C S-8338ABFB-T8T1x A B F B S-8338AABA-T8T1x A A B A S-8338ABFC-T8T1x A B F C S-8338AABB-T8T1x A A B B S-8338ABGA-T8T1x A B G A S-8338AABC-T8T1x A A B C S-8338ABGB-T8T1x A B G B S-8338AACA-T8T1x A A C A S-8338ABGC-T8T1x A B G C S-8338AACB-T8T1x A A C B S-8338ABHA-T8T1x A B H A S-8338AACC-T8T1x A A C C S-8338ABHB-T8T1x A B H B S-8338AADA-T8T1x A A D A S-8338ABHC-T8T1x A B H C S-8338AADB-T8T1x A A D B S-8338ABIA-T8T1x A B I A S-8338AADC-T8T1x A A D C S-8338ABIB-T8T1x A B I B S-8338AAEA-T8T1x A A E A S-8338ABIC-T8T1x A B I C S-8338AAEB-T8T1x A A E B S-8338ACAA-T8T1x A C A A S-8338AAEC-T8T1x A A E C S-8338ACAB-T8T1x A C A B S-8338AAFA-T8T1x A A F A S-8338ACAC-T8T1x A C A C S-8338AAFB-T8T1x A A F B S-8338ACBA-T8T1x A C B A S-8338AAFC-T8T1x A A F C S-8338ACBB-T8T1x A C B B S-8338AAGA-T8T1x A A G A S-8338ACBC-T8T1x A C B C S-8338AAGB-T8T1x A A G B S-8338ACCA-T8T1x A C C A S-8338AAGC-T8T1x A A G C S-8338ACCB-T8T1x A C C B S-8338AAHA-T8T1x A A H A S-8338ACCC-T8T1x A C C C S-8338AAHB-T8T1x A A H B S-8338ACDA-T8T1x A C D A S-8338AAHC-T8T1x A A H C S-8338ACDB-T8T1x A C D B S-8338AAIA-T8T1x A A I A S-8338ACDC-T8T1x A C D C S-8338AAIB-T8T1x A A I B S-8338ACEA-T8T1x A C E A S-8338AAIC-T8T1x A A I C S-8338ACEB-T8T1x A C E B S-8338ABAA-T8T1x A B A A S-8338ACEC-T8T1x A C E C S-8338ABAB-T8T1x A B A B S-8338ACFA-T8T1x A C F A S-8338ABAC-T8T1x A B A C S-8338ACFB-T8T1x A C F B S-8338ABBA-T8T1x A B B A S-8338ACFC-T8T1x A C F C S-8338ABBB-T8T1x A B B B S-8338ACGA-T8T1x A C G A S-8338ABBC-T8T1x A B B C S-8338ACGB-T8T1x A C G B S-8338ABCA-T8T1x A B C A S-8338ACGC-T8T1x A C G C S-8338ABCB-T8T1x A B C B S-8338ACHA-T8T1x A C H A S-8338ABCC-T8T1x A B C C S-8338ACHB-T8T1x A C H B S-8338ABDA-T8T1x A B D A S-8338ACHC-T8T1x A C H C S-8338ABDB-T8T1x A B D B S-8338ACIA-T8T1x A C I A S-8338ABDC-T8T1x A B D C S-8338ACIB-T8T1x A C I B S-8338ABEA-T8T1x A B E A S-8338ACIC-T8T1x A C I C S-8338ABEB-T8T1x A B E B Remark 1. x: G or U 2. Please select products of environmental code = U for Sn 100%, halogen-free products.

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Product Information

S8337 specifications and overview.

Summary

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER

Description

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER

Source title S8337 Datasheet(PDF) - Seiko Instruments Inc

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