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www.sii-ic.com STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER © SII Semiconductor Corporation, 2002-2010 Rev.3.0_01 The S-8533 Series is a synchronous PWM c ontrol CMOS step-down switching regulator controller that includes a reference voltage source, synchronous circuit, oscillation circuit, error amplifier, phase compensation circuit, and PWM controller. An efficient step-down switching regulat or can be realized simply by adding ex ternal P-channel and N-channel power MOS FETs, one coil, and three capacitors. Since the oscillation frequency is a high 300 kHz, the S-8533 can be used to configure a high efficiency step-down switching regulator capable of driving hi gh output current using small ex ternal parts and a 3 to 10% increase in efficiency is obtained compared to conventional step-down switching regulators. The 8-Pin TSSOP package and high oscillation frequency make t he S-8533 ideal as the main power supply for portable devices. Features
- Synchronous rectification system realizing high efficiency (typ. 94%)
- Use at maximum duty ratio = 100% and use of a battery up to maximum life is possible by using P-channel and N- channel power MOS FETs externally.
- Oscillation frequency : 300 kHz typ.
- Input voltage : 2.7 to 16.0 V
- Output voltage : 1.25 V 1.3 to 6.0 V, sele ctable in 0.1 V steps
- Output voltage accuracy : ±2.0%
- Soft-start function set by an external capacitor (C SS)
- Shutdown function
- Lead-free, Sn 100%, halogen-free *1 *1. Refer to “ Product Name Structure” for details. Applications
- Constant voltage power suppl y for hard disks and DVD drivers
- Power supplies for portable devices, such as digita l cameras, PDAs, electronic organizers, and cellular phones
- Main or sub power supply for notebook PCs and peripherals
- Constant voltage power supply for camera s, video equipment, and communication equipment Package
- 8-Pin TSSOP
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 Block Diagram VSS VOUT L COUT Reference voltage source with soft start PWM control circuit P.N feed-through prevention circuit Oscillation circuit VIN Tr Tr CSS CSS PDRV NDRV VIN CIN ON / OFF Remark All the diodes in the figure are parasitic diodes. Figure 1
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8533 Series Product Name Structure The output voltage for the S-8533 Series can be selected depending on usage. Refer to “ 1. Product Name ” for the definition of the product name, “2. Package ” regarding the package drawings and “3. Product Name List ” for the full product names. 1. Product Name S-8533A xx x FT – TB – x Environmental code U: Lead-free (Sn 100%), halogen-free G: Lead-free (for details, please contact our sales office) IC direction in tape specifications*1 Package name (abbreviation) FT : 8-Pin TSSOP Output voltage A : 1.3 to 6.0 V 5 : 1.25 V Output voltage 13 to 60 (E.g., when the output voltage is 1.5 V, it is expressed as 15.) The product whose output voltage is 1.25 V expresses 12. *1. Refer to the tape specifications. 2. Package Package Name Drawing Code Package Tape Reel 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-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 3. Product Name List Output Voltage Product Name
1.25 V S-8533A125FT-TB-x
1.3 V S-8533A13AFT-TB-x
1.4 V S-8533A14AFT-TB-x
1.5 V S-8533A15AFT-TB-x
1.8 V S-8533A18AFT-TB-x
2.5 V S-8533A25AFT-TB-x
2.7 V S-8533A27AFT-TB-x
2.8 V S-8533A28AFT-TB-x
3.0 V S-8533A30AFT-TB-x
3.3 V S-8533A33AFT-TB-x
3.9 V S-8533A39AFT-TB-x
4.1 V S-8533A41AFT-TB-x
4.5 V S-8533A45AFT-TB-x
4.8 V S-8533A48AFT-TB-x
4.9 V S-8533A49AFT-TB-x
5.0 V S-8533A50AFT-TB-x
5.2 V S-8533A52AFT-TB-x
5.5 V S-8533A55AFT-TB-x
6.0 V S-8533A60AFT-TB-x
Remark 1. Contact the SII Semiconductor Corporation mark eting department for the availability of product samples other than those specified above. 2. x: G or U 3. Please select products of environmental code = U for Sn 100%, halogen-free products.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8533 Series Pin Configurations Table 1 8-Pin TSSOP Top view Figure 2 Pin No. Symbol Pin Description
1 NC*1 No connection
2 VOUT Output voltage pin
3 ON/ OFF
H : Normal operation (step-down operation) L : Step-down operation stopped (all circuits deactivated)
4 CSS Soft start capacitor connection pin
5 VSS GND pin
6 NDRV External N-channel connection pin
7 PDRV External P-channel connection pin
8 VIN IC power supply pin
*1. The NC pin is electrically open. Connection of this pin to VIN or VSS is allowed.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 Absolute Maximum Ratings Table 2 (Ta = 25°C unless otherwise specified) Parameter Symbol Absolu te Maximum Rating Unit VIN pin voltage V IN V SS − 0.3 to VSS + 18 V VOUT pin voltage V OUT V SS − 0.3 to VSS + 18 V ON/OFF pin voltage V ON/OFF V SS − 0.3 to VSS + 18 V CSS pin voltage V CSS V SS − 0.3 to VIN + 0.3 V NDRV pin voltage V NDRV V SS − 0.3 to VIN + 0.3 V PDRV pin voltage V PDRV V SS − 0.3 to VIN + 0.3 V NDRV pin current I NDRV ±100 mA PDRV pin current I PDRV ±100 mA Power dissipation P D 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 ra tings are rated values exceeding whic h 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 0 50 100 150 300 200 100 Power dissipation (PD) [mW] Ambient temperature (Ta) [°C] 400 Figure 3 Power Dissipation of Package
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8533 Series Electrical Characteristics Table 3 VIN = VOUT × 1.5 V, IOUT = VOUT/50 A (In case VOUT ≤ 1.8 V, VIN = 2.7 V) (Ta = 25°C unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit Measurement Circuit Output voltage*1 V OUT(E) − VOUT(S) × 0.98 VOUT(S) VOUT(S) × 1.02 V 2 Input voltage V IN − 2.7 − 16.0 V 1 Current consumption 1 I SS1 No external parts, VOUT = VOUT(S) × 0.95 (Duty ratio 100%) − 30 70 μA 1 Current consumption during power-off ISSS VON/OFF = 0 V − − 1.0 μA 1 PDRV pin output current IPDRVH No external parts, VOUT = VOUT(S) × 1.5, VIN = 9.0 V, VPDRV = VIN − 0.2 V −12 −18 − mA 1 IPDRVL No external parts, VOUT = VOUT(S) × 0.95, VIN = 9.0 V, VPDRV = 0.2 V 19 27 − mA 1 NDRV pin output current INDRVH No external parts, VOUT = VOUT(S) × 1.5, VIN = 9.0 V, VNDRV = VIN − 0.2 V −10 −14 − mA 1 INDRVL No external parts, VOUT = VOUT(S) × 0.95, VIN = 9.0 V, VNDRV = 0.2 V 35 50 − mA 1 Line regulation ΔVOUT1 V IN = VOUT(S) × 1.2 to 16 V*2 S-8533A125, S-8533A13A to 29A − VOUT(E) × 1.0% VOUT(E) × 2.5% V 2 S-8533A30A to 60A − VOUT(E) × 1.0% VOUT(E) × 2.0% V 2 Load regulation ΔVOUT2 I OUT = 10 μA to IOUT (see above) × 1.25 − VOUT(E) × 0.5% VOUT(E) × 1.0% V 2 Output voltage temperature coefficient Δ Δ V Ta V OUT OUT• Ta = −40 to +85°C − ±100 − ppm/°C − Oscillation frequency f OSC Measure waveform at the PDRV pin. 255 300 345 kHz 2 Maximum duty ratio MaxDuty The same condition as lSS1. Measure waveform at the PDRV pin. 100 − − % 1 VOUT pin input current I VOUT V OUT = 5.0 V 0.01 0.1 4.0 μA 1 ON/ OFF pin input voltage VSH The same condition as ISS1. VIN = 2.7 V and check that PDRV pin = "L". 1.8 − − V 1 VSL The same condition as ISS1. VIN = 16.0 V and check that PDRV pin = "H". − − 0.3 V 1 ON/ OFF pin input leakage current ISH The same condition as I SS1. VON/OFF = VIN −0.1 − 0.1 μA 1 ISL The same condition as I SS1. VON/OFF = 0 V −0.1 − 0.1 μA 1 Soft-start time t SS The same condition as ISS1. Measure time until PDRV pin oscillates. 5.0 8.0 16.0 ms 1 Efficiency EFFI *3, IOUT = 200 to 400 mA, S-8533A33A − 94 − % 3 External parts : Coil : Sumida Corporation CD105 (22 μH) Diode : Matsushita Elec tric Industrial Co., Ltd. MA737 (Schottky diode) Capacitor : Nichicon Corporation F93 (16 V, 47 μF, tantalum) × 2 Transistor : Toshiba Corporation 2SA1213 Base resistance : 1 k Ω Base capacitor : 2200 pF C SS : 4700 pF C NDRV : 1000 pF *1. VOUT(S) : Nominal output voltage value V OUT(E) : Actual output voltage value : VIN = VOUT × 1.5 V, IOUT = VOUT/50 A (If VOUT ≤ 1.8 V, VIN = 2.7 V.) *2. In case VOUT(S) ≤ 2.2 V, VIN = 2.7 to 16 V *3. External parts Coil : Sumida Corporation CDRH104R (22 μH) Capacitor : Nichicon Corporation F93 (16 V, 47 μF, tantalum) × 2 P-channel power MOS FET : Sany o Electric Co., Ltd. CPH6303 (V GS = 10 V max.) N-channel power MOS FET : Sany o Electric Co., Ltd. CPH6403 (V GS = 10 V max.) C SS : 4700 pF
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8533 Series Operation 1. Synchronous PWM Control Step-down DC-DC Converter 1. 1 Synchronous Rectification A synchronous rectifying DC-DC converter enables a greater reduction in the power consumption of the external rectifying element compared with a conventional DC-DC c onverter. In addition, incorporating a P and N feed- through prevention circuit reduces the feed-through current during operation of external transistors (P-channel and N-channel), making the operating power consumption extremely low. 1. 2 PWM Control The S-8533 Series is a DC-DC converter that uses pulse width modulation (PWM) and is characterized by its low current consumption. In conventional modulation PFM system DC-DC converte rs, pulses are skipped when they are operated with a low output load current, causing variations in the ripple frequency of the output voltage and an increase in the ripple voltage. Both of these effects constitute inherent drawbacks to those converters. In the S-8533 Series, the pulse width varies in the range from 0 to 100% according to the load current, yet the ripple voltage produced by the switching can easily be eliminated by a filter since the switching frequency is always constant. When the pulse width is 0% (when there is no l oad or the input voltage is high), current consumption is low since pulses are skipped. 2. Soft-Start Function The S-8533 Series has a built-in soft-start circuit. This circuit enables the output voltage (V OUT) to rise gradually over the specified soft-start time (tSS) to suppress the overshooting of the output voltage, when the power is switched on or the ON/OFF pin is set “H”. The soft-start time can be set with an external capacitance (C SS). The time needed for the output voltage to reach 95% of the set output voltage value is calculated by the following formula. tSS [ms] = 0.002 × CSS [pF] 0 5000 10000 15000 20000 External capacitance (CSS) [ pF] Soft-start time (tSS) [ms] Figure 7 Soft-Start Time The value for C SS should be selected to give enough margin to the soft-start time against the power supply rise time. If the soft-start time is short, possibility for output voltage overshoot, input current rush, and malfunction of the IC increases.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 3. ON/OFF Pin (Shutdown Pin) This pin is used to activate and deactivate the step-down operation. When the ON/OFF pin is set to “L”, all the internal circuits stop working, and substantial savings in current consumption are thus achieved. T he voltage of the PDRV pin goes to V IN level and voltage of the NDRV pin goes to VSS level to shut off the respective transistors. The ON/OFF pin is configured as shown in Figure 8 . Since pull-up or pull-down is not performed internally, operation where the ON/OFF pin is in a floating state should be avoided. Application of a voltage of 0.3 to 1.8 V to the pin should also be avoided lest the current consumption increases. When the ON/OFF pin is not used, it should be connected to the VIN pin. ON/OFF VIN VSS Figure 8 ON/OFF Pin Structure ON/OFF Pin CR Oscillation Circuit Output Voltage “H” Active Set value “L” Non-active Open 4. 100% Duty Cycle The S-8533 Series operates with a maximum duty cycle of 100%. The switching transistor can be kept on to supply current to the load continually, even in cases where the input voltage falls below the preset output voltage value. The output voltage under these circumstances is equal to the subtraction of the lowering due to the DC resistance of the coil and the on-resistance of the switching transistor from the input voltage. 5. Back-Flow Current Since the S-8533 Series performs PWM synchronous rectificat ion under a light load, current flows backward in the VIN direction. The back-flow current therefore reaches its peak when there is no load (see Figure 9). Pay attention to the maximum back-flow current value, which can be calculated from the following expressions. Duty (I OUT = 0) = VOUT/VIN Example : V IN = 5 V, VOUT = 3 V, Duty = 60% ΔIL = ΔV/L × ton = (VIN − VOUT) × Duty/(L × fOSC) × 1.2 Example : V IN = 5 V, VOUT = 3 V, fOSC = 300 kHz, L = 22 μH, ΔIL = 218 mA I Lmax. = ΔIL/2 = 109 mA, ILmin. = −ΔIL/2 = −109 mA When there is no load, the current waveform becomes a triangular wave with the maximum, I Lmax., and the minimum, ILmin., which is negative. The negative current, shaded regions in Figure 10, flows backward. When the output current (I OUT) is approximately 109 mA under the above conditions, the current does not flow backward since the minimum value (ILmin) of the triangular wave becomes 0 mA. When an input capacitor (C IN) is installed, back-flow current to the power source is negligible since the back-flow current is absorbed by the input capacitor. The input capac itor is indispensable to reduce back-flow current to the power source.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 External Parts Selection 1. Inductor The inductance value (L) greatly affects the maximum output current (IOUT) and the efficiency (η). As the L value is reduced gradually, the peak current (IPK) increases, the stability of the circuit is improved, and I OUT increases. As the L value is made even sm aller, the efficiency is lowered, and I OUT decreases since the current driveability of the switching transistor is insufficient. As the L value is increased, the dissipation in the switching transistor due to I PK decreases, and the efficiency reaches the maximum at a certain L value. As the L value is made even larger, the efficiency degrades since the dissipation due to the series resistance of the coil increases. IOUT also decreases. An inductance of 22 μH is recommended for the S-8533 Series. When choosing an inductor, attention to its allowable current should be paid since the current exceeding the allowable value will cause magnetic saturation in the inductor, leading to a marked decline in efficiency and the breakdown of the IC due to large current. An inductor should therefore be selected so that I PK does not surpass its allowable current. I PK is expressed by the following equation : INOSC OUTINOUT OUTPK V L f 2 )V (V V I I ××× −×+= where fOSC (= 300 kHz) is the oscillation frequency. 2. Capacitors (C IN, COUT) The capacitor (C IN) inserted on the input side serves to lower the power impedance, average input current, and suppress back-flow current to the power source. Select the C IN value according to the impedance of the power supplied, and select a capacitor that has low ESR (Equiva lent Series Resistance) and large capacitance. It should be approximately 47 to 100 μF, although the actual value depends on the impedance of the power source used and load current value. When the input voltage is low and the load is large, the output voltage may become unstable. In this case, increase the input capacitance. For the output side capacitor (C OUT), select a large capacitance with low ESR (Equivalent Series Resistance) to smoothen the ripple voltage. When the input voltage is extrem ely high or the load current is extremely large, the output voltage may become unstable. In this case, the unstable area will become narrow by selecting a large capacitance for an output side capacitor. A tantalum electrolytic capacitor is recommended since the unstable area widens when a capacitor with a large ESR, such as an alumi num electrolytic capacitor, or a capacitor with a small ESR, such as a ceramic capacitor, is chosen. The range of the capacitance shoul d generally be approximately 47 to 100 μF. Fully evaluate input and output capacitors under the actual operating conditions to determine the best value.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8533 Series 3. External Transistor Enhancement (P-channel, N-channel) MOS FETs can be used as external switching transistors for the S-8533 Series. 3. 1 Enhancement (P-channel, N-channel) MOS FET The PDRV/NDRV pin of the S-8533 Series is capable of directly driving a P-channel or N-channel MOS FET with a gate capacity around 1000 pF. When P-channel/N-channel MOS FETs are chosen, efficiency will be 2 to 3% higher than that achieved by a PNP/NPN bipolar transistor since MOS FET switching speeds are higher than PNP/NPN bipolar transistors and power dissipation due to the base current is avoided. The important parameters in selecting MOS FETs in clude the threshold voltage, breakdown voltage between gate and source, breakdown voltage between drain and source, to tal gate capacity, on-resistance, and the current ratings. The PDRV and NDRV pins swing from voltage V IN over to voltage VSS. If the input voltage is low, a MOS FET with a low threshold voltage has to be used so that the MOS FET will turn on as r equired. If, conversely, the input voltage is high, select a MOS FET whose gate-source breakdown voltage is higher than the input voltage by at least several volts. Immediately after the power is turned on, or when the pow er is turned off (that is, when the step-down operation is terminated), the input voltage will be imposed across the dr ain and the source of the MOS FET. The transistor therefore needs to have drain-source breakdown voltage that is also several volts higher than the input voltage. The total gate capacity and the on-resistance affect the efficiency. The power dissipation for charging and discharging the gate capacity by switching operation will affect the efficiency especially at low load current region when the total gat e capacity becomes larger and the input voltage becomes higher. If the efficiency under light loads is a matter of parti cular concern, select a MOS FET with a small total gate capacity. In regions where the load current is high, the efficiency is affected by power dissipation caused by the on-resistance of the MOS FET. If the efficiency under heavy loads is parti cularly important in the application, choose a MOS FET with as low an on-resistance as possible. As for the current rating, select a MOS FET whose maximum continuous drain current rating is higher than I PK. If an external P-channel MOS FET has much different characteristics (input capacitance, threshold value, etc.) from an external N-channel MOS FET, they turn ON at the same time, flowing a through current and reducing efficiency. If a MOS FET with a large input capacitance is used, swit ching dissipation increases and efficiency decreases. If it is used at several hundreds of mA or more, the di ssipation at the MOS FET increases and may exceed the permissible dissipation of the MOS FET. To select P-channel and N-channel MOS FETs, evaluate the performance by testing under the actual condition. Caution If the load current is large, the P-channel MOS FET dissipation increases and heat is generated. Pay attention to dissipate heat from the P-channel MOS FET. Efficiency data using Sanyo Electric Co., Ltd. CP H6303, CPH6403, and Vishay Siliconix Si3441DV and Si3442DV for applications with an input voltage range of 6 to 8 V or less is included for reference. For applications with an input voltage range of 6 to 8 V or more, efficiency data using Sanyo Electric Co., Ltd. CPH6302, CHP6402, and Vishay Siliconix Si3454DV and Si3455DV is included. Refer to “ Reference Data”. Current flow in the parasitic diode is not allowed in some MOS FETs. In this case, a Schottky diode must be connected in parallel to the MOS FET. The Schottky diode must have a low forward voltage, a high switching speed, a reverse-direction withstand voltage of V IN or higher, and a current rating of IPK or higher.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 Standard Circuit
- Using MOS FET L VIN Nch Power MOS FET COUT CIN VOUT Pch Power MOS FET 1 8 4 5 CSS S-8533 VON / OFF + + Figure 11 Caution The above connection diagram does not guarantee correct operation. Perform sufficient evaluation using the actual application to set the constants.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8533 Series Precautions
- Install the external capacitors, diode, coil, and other peri pheral parts as close to the IC as possible, and make a one- point grounding.
- Normally, the P-channel and N-channel MOS FETs do not turn ON at the same time. However, if the external P- channel MOS FET has much different characteristics (input capacitance, V th, etc.) from the external N-channel MOS FET, they may turn ON at the same time, flowing a through current. Select P-channel and N-channel transistors with similar characteristics.
- Characteristics ripple voltage and spike noise occur in IC c ontaining switching regulators. Moreover rush current flows at the time of a power supply injection. Because t hese largely depend on the coil, the capacitor and impedance of power supply used, fully check them using an actually mounted model.
- If the input voltage is high and output current is low, pulses with a low duty ratio may be output, and then the duty ratio may be 0% for several clocks.
- The PDRV and NDRV oscillation frequencies may be an integer fraction of 300 kHz at some input voltage and load conditions. In this case, the ripple voltage may increase.
- The through current prevention circuit reduces through cu rrent by shifting the P-channel and N-channel transistor on timing. It does not suppress the through current in the external transistors completely.
- Since PWM synchronous rectification is performed ev en when the load is light, current flows back to V IN. Check whether the back-flow occurs and whether it affects the performance. (See “ 5. Back-Flow Current ” in “ Operation”.)
- The PDRV or NDRV oscillation frequency may va ry in a voltage range, depending on input voltage.
- When decreasing the power supply voltage slowly, the IC operation may be undefined if the voltage falls below the minimum operating voltage.
- Make sure that dissipation of the switching transistor especially at high temperature will not surpass the power dissipation of the package.
- Switching regulator performance varies depending on the des ign of PCB patterns, peripheral circuits and parts. Thoroughly evaluate the actual device when setting. W hen using parts other than those which are recommended, contact the SII Semiconductor Corporation marketing department.
- Do not apply an electrostatic discharge to this IC that ex ceeds the performance ratings of the built-in electrostatic protection circuit.
- SII Semiconductor Corporation claims no responsibility for any disputes arising out of or in connection with any infringement by products including this IC of patents owned by a third party.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 Characteristics (Typical Data) 1. Examples of Major Characteristics (1) Current Consumption 1 (I SS1) vs. Input Voltage (VIN) (2) Oscillation Frequency (f OSC) vs. Input Voltage (VIN) 2 4 6 8 10 12 14 Ta = 25°C Ta = −40°C Ta = 85°C ISS1 (μA) VIN (V) 100 2 4 6 8 10 12 14 fOSC (kHz) VIN (V) 360 340 320 300 280 260 240 Ta = 25°C Ta = −40°C Ta = 85°C (3) PDRV Pin Output Current “H” (I PDRVH) vs. Input Voltage (VIN) (4) PDRV Pin Output Current “L” (I PDRVL) vs. Input Voltage (VIN) 2 4 6 8 10 12 14 IPDRVH (mA) VIN (V) Ta = 85°C Ta = −40°C Ta = 25°C 2 4 6 8 10 12 14 IPDRVL (mA) VIN (V) Ta = −40°C Ta = 25°C Ta = 85°C (5) NDRV Pin Output Current “H” (I NDRVH) vs. Input Voltage (VIN) (6) NDRV Pin Output Current “L” (I NDRVL) vs. Input Voltage (VIN) 2 4 6 8 10 12 14 INDRVH (mA) VIN (V) Ta = 85°C Ta = 25°C Ta = −40°C 2 4 6 8 10 12 14 INDRVL (mA) VIN (V) 120 100 Ta = −40°C Ta = 25°C Ta = 85°C (7) ON/OFF Pin Input Voltage “H” (V SH) vs. Input Voltage (VIN) (8) ON/OFF Pin Input Voltage “L” (V SL) vs. Input Voltage (VIN) 2 4 6 8 10 12 14 VSH (V) VIN (V) 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 Ta = 85°C Ta = 25°C Ta = −40°C 2 4 6 8 10 12 14 VSL (V) VIN (V) 1.7 1.5 1.3 1.1 0.9 0.7 0.5 0.3 Ta = −40°C Ta = 25°C Ta = 85°C
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8533 Series (9) Soft-Start Time (t SS) vs. Input Voltage (VIN) 2 4 6 8 10 12 14 tSS (ms) VIN (V) Ta = 85°C Ta = 25°C Ta = −40°C (10) Output Voltage (V OUT) vs. Input Voltage (VIN) (1.5 V : S-8533A15AFT) (11) Output Voltage (V OUT) vs. Input Voltage (VIN) (3.3 V : S-8533A33AFT) 2 4 6 8 10 12 14 VOUT (V) VIN (V) 1.53 1.52 1.51 1.50 1.49 1.48 1.47 IOUT = 100 mA IOUT = 0.1 mA IOUT = 400 mA 2 4 6 8 10 12 14 VOUT (V) VIN (V) 3.37 3.35 3.33 3.31 3.29 3.27 3.25 3.23 IOUT = 0.1 mA IOUT = 100 mA IOUT = 400 mA (12) Output Voltage (V OUT) vs. Input Voltage (VIN) (5.0 V : S-8533A50AFT) 2 4 6 8 10 12 14 VOUT (V) VIN (V) 5.08 5.06 5.04 5.02 5.00 4.98 4.96 4.94 4.92 16 IOUT = 100 mA IOUT = 0.1 mA IOUT = 400 mA
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 2. Examples of Transient Response Characteristics (1) Power-on (V IN : 0 V → 2.7 V or 5.0 V or 7.5 V, 0 V → 9.0 V, IOUT : 10 mA) S-8533A15AFT (VIN : 0 V → 2.7 V) S-8533A15AFT (V IN : 0 V → 9.0 V) t (2 ms/div) 10 V 0 V Input voltage (2.5 V/div) Output voltage (1 V/div) 3 V 0 V t (2 ms/div) 10 V 0 V Input voltage (2.5 V/div) Output voltage (1 V/div) 3 V 0 V S-8533A33AFT (VIN : 0 V → 5.0 V) S-8533A33AFT (V IN : 0 V → 9.0 V) t (2 ms/div) 10 V 0 V Input voltage (2.5 V/div) Output voltage (1 V/div) 3 V 0 V t (2 ms/div) 10 V 0 V Input voltage (2.5 V/div) Output voltage (1 V/div) 3 V 0 V S-8533A50AFT (VIN : 0 V → 7.5 V) S-8533A50AFT (V IN : 0 V → 9.0 V) t (2 ms/div) 10 V 0 V Input voltage (2.5 V/div) Output voltage (1.5 V/div) 4.5 V 0 V t (2 ms/div) 10 V 0 V Input voltage (2.5 V/div) Output voltage (1.5 V/div) 4.5 V 0 V
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8533 Series (2) ON/OFF Pin Response (V ON/OFF : 0 V → 1.8 V, IOUT : 10 mA) S-8533A15AFT (VIN : 2.7 V) S-8533A15AFT (V IN : 9.0 V) t (2 ms/div) 4 V 0 V (1 V/div) Output voltage (1 V/div) 3 V 0 V ON/OFF pin voltage t (2 ms/div) 4 V 0 V (1 V/div) Output voltage (1 V/div) 3 V 0 V ON/OFF pin voltage S-8533A33AFT (VIN : 5.0 V) S-8533A33AFT (V IN : 9.0 V) t (2 ms/div) 4 V 0 V (1 V/div) Output voltage (1 V/div) 3 V 0 V ON/OFF pin voltage t (2 ms/div) 4 V 0 V (1 V/div) Output voltage (1 V/div) 3 V 0 V ON/OFF pin voltage S-8533A50AFT (VIN : 7.5 V) S-8533A50AFT (V IN : 9.0 V) t (2 ms/div) 4 V 0 V (1 V/div) Output voltage (1.5 V/div) 4.5 V 0 V ON/OFF pin voltage t (2 ms/div) 4 V 0 V (1 V/div) Output voltage (1.5 V/div) 4.5 V 0 V ON/OFF pin voltage
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 S-8533A15AFT (VIN : 2.7 V) S-8533A15AFT (V IN : 2.7 V) t (0.1 ms/div) 500 mA Output voltage (0.1 V/div) Output current 0.1 mA t (0.1 ms/div) 500 mA Output voltage (0.1 V/div) Output current 0.1 mA S-8533A33AFT (VIN : 5.0 V) S-8533A33AFT (V IN : 5.0 V) t (0.1 ms/div) 500 mA Output voltage (0.1 V/div) Output current 0.1 mA t (0.1 ms/div) 500 mA Output voltage (0.1 V/div) Output current 0.1 mA S-8533A50AFT (VIN : 7.5 V) S-8533A50AFT (V IN : 7.5 V) t (0.1 ms/div) 500 mA Output voltage (0.1 V/div) Output current 0.1 mA t (0.1 ms/div) 500 mA Output voltage (0.1 V/div) Output current 0.1 mA
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8533 Series S-8533A15AFT (IOUT : 10 mA) S-8533A15AFT (I OUT : 500 mA) t (0.5 ms/div) Output voltage (0.1 V/div) Input voltage 10 V (2.5 V/div) 0 V t (0.5 ms/div) Output voltage (0.1 V/div) Input voltage 10 V (2.5 V/div) 0 V S-8533A33AFT (IOUT : 10 mA) S-8533A33AFT (I OUT : 500 mA) t (0.5 ms/div) Output voltage (0.1 V/div) Input voltage 10 V (2.5 V/div) 0 V t (0.5 ms/div) Output voltage (0.1 V/div) Input voltage 10 V (2.5 V/div) 0 V S-8533A50AFT (IOUT : 10 mA) S-8533A50AFT (I OUT : 500 mA) t (0.5 ms/div) Output voltage (0.1 V/div) Input voltage 10 V (2.5 V/div) 0 V t (0.5 ms/div) Output voltage (0.1 V/div) Input voltage 10 V (2.5 V/div) 0 V
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 Reference Data Reference data are intended for use in selecting peripheral parts to the IC. The information therefore provides characteristic data in which external parts are selected with a view of wide variety of IC applications. All data show typical values. 1. External Parts for Reference Data Table 4 External Parts List for Output Current vs. Efficiency Characteristics No. Product Name Output Voltage Inductor Transistor P-channel Transistor N-channel Output Capacitor Input Capacitor Application Condition (1) S-8533A15AFT 1.5 V CDRH104R/22 μH CPH6303 CPH6403 47 μF × 2 47 μF, 0.1 μF IOUT ≤ 2 A, VIN ≤ 8 V (2) Si3441DV Si3442DV I OUT ≤ 1.4 A, VIN ≤ 6 V (3) S-8533A33AFT 3.3 V CPH6303 CPH6403 I OUT ≤ 2 A, VIN ≤ 8 V (4) Si3441DV Si3442DV I OUT ≤ 1.4 A, VIN ≤ 6 V (5) CPH6302 CPH6402 I OUT ≤ 2 A, VIN ≤ 16 V (6) Si3455DV Si3454DV I OUT ≤ 1.6 A, VIN ≤ 16 V (7) S-8533A50AFT 5.0 V CPH6302 CPH6402 I OUT ≤ 2 A, VIN ≤ 16 V (8) Si3455DV Si3454DV I OUT ≤ 1.6 A, VIN ≤ 16 V (9) S-8533A15AFT 1.5 V CDRH104R/47 μH CPH6303 CPH6403 I OUT ≤ 2 A, VIN ≤ 8 V (10) Si3441DV Si3442DV I OUT ≤ 1.4 A, VIN ≤ 6 V (11) S-8533A33AFT 3.3 V CPH6303 CPH6403 I OUT ≤ 2 A, VIN ≤ 8 V (12) Si3441DV Si3442DV I OUT ≤ 1.4 A, VIN ≤ 6 V (13) CPH6302 CPH6402 I OUT ≤ 2 A, VIN ≤ 16 V (14) Si3455DV Si3454DV I OUT ≤ 1.6 A, VIN ≤ 16 V (15) S-8533A50AFT 5.0 V CPH6302 CPH6402 I OUT ≤ 2 A, VIN ≤ 16 V (16) Si3455DV Si3454DV I OUT ≤ 1.6 A, VIN ≤ 16 V (17) S-8533A15AFT 1.5 V CDRH104R/10 μH CPH6303 CPH6403 I OUT ≤ 2 A, VIN ≤ 8 V (18) Si3441DV Si3442DV I OUT ≤ 1.4 A, VIN ≤ 6 V (19) S-8533A33AFT 3.3 V CPH6303 CPH6403 I OUT ≤ 2 A, VIN ≤ 8 V (20) Si3441DV Si3442DV I OUT ≤ 1.4 A, VIN ≤ 6 V (21) CPH6302 CPH6402 I OUT ≤ 2 A, VIN ≤ 16 V (22) Si3455DV Si3454DV I OUT ≤ 1.6 A, VIN ≤ 16 V (23) S-8533A50AFT 5.0 V CPH6302 CPH6402 I OUT ≤ 2 A, VIN ≤ 16 V (24) Si3455DV Si3454DV I OUT ≤ 1.6 A, VIN ≤ 16 V (25) S-8533A33AFT 3.3 V CDRH125/10 μH CPH6303 CPH6403 I OUT ≤ 3 A, VIN ≤ 8 V (26) CPH6302 CPH6402 I OUT ≤ 3 A, VIN ≤ 16 V
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8533 Series External Parts List for Ripple Data Table 5 External Parts for Input Voltage vs. Ripple Voltage Characteristics Data No. Product Name Output Voltage Inductor Transistor P-channel Transistor N-channel Output Capacitor Input Capacitor Application Condition (27) S-8533A15AFT 1.5 V CDRH104R/22 μH CPH6303 CPH6403 47 μF × 2 47 μF, 0.1 μF IOUT ≤ 2 A, VIN ≤ 8 V (28) Si3441DV Si3442DV I OUT ≤ 1.4 A, VIN ≤ 6 V (29) S-8533A33AFT 3.3 V CPH6303 CPH6403 I OUT ≤ 2 A, VIN ≤ 8 V (30) Si3441DV Si3442DV I OUT ≤ 1.4 A, VIN ≤ 6 V (31) CPH6302 CPH6402 I OUT ≤ 2 A, VIN ≤ 16 V (32) Si3455DV Si3454DV I OUT ≤ 1.6 A, VIN ≤ 16 V (33) S-8533A50AFT 5.0 V CPH6302 CPH6402 I OUT ≤ 2 A, VIN ≤ 16 V (34) Si3455DV Si3454DV I OUT ≤ 1.6 A, VIN ≤ 16 V Performance Data for Parts The following shows the performance of external parts. Table 6 Performance of External Parts Parts Product Name Manufacturer Characteristics Inductor CDRH125 Sumida Corporation L Value DC Resistance Maximum Current Diameter Height 10 μH 0.019 Ω 4.0 A 12.0 mm typ. 12.3 mm max. 8.0 mm max. CDRH104R 47 μH 0.095 Ω 1.9 A 10.2 mm typ. 10 μH 0.026 Ω 3.8 A Diode MA737 Matsushita Electric Industrial Co., Ltd Forward current 1.5 A (@VF = 0.5 V) Output Capacity F93 Nichicon Corporation External transistor (P-channel FET) CPH6303 Sanyo Electric Co., Ltd VGS = 10 V max., ID = −4 A max., Vth = −0.4 V min., Ciss = 820 pF typ., RDS(ON) = 0.090 Ω max. (VGS = −4 V), CPH6 package CPH6302 VGS = 20 V max., ID = −3 A max., Vth = −1.0 V min., Ciss = 300 pF typ., RDS(ON) = 0.145 Ω max. (VGS = −10 V), CPH6 package Si3441DV Vishay Silliconix RDS(ON) = 0.10 Ω max. (VGS = −4.5 V), TSOP-6 package RDS(ON) = 0.100 Ω max. (VGS = −10 V), TSOP-6 package External transistor (N-channel FET) CPH6403 Sanyo Electric Co., Ltd VGS = 10 V max., ID = 6 A max., Vth = 0.4 V min., Ciss = 700 pF typ., RDS(ON) = 0.038 Ω max. (VGS= 4 V), CPH6 package CPH6402 VGS = 24 V max., ID = 4 A max., Vth = 1.0 V min., Ciss = 240 pF typ., RDS(ON) = 0.75 Ω max. (VGS= 10 V), CPH6 package Si3442DV Vishay Silliconix RDS(ON) = 0.07 Ω max. (VGS = 4.5 V), TSOP-6 package RDS(ON) = 0.065 Ω max. (VGS = 10 V), TSOP-6 package Caution The value of each characteristic in Table 6 depends on the materials prepared by each manufacturer, however, confirm the specifications by referring to respective materials when using any of the above.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 2. Output Current (IOUT) vs. Efficiency (η) Characteristics The following shows the actual output current (I OUT) vs. efficiency ( η) characteristics when the S-8533 Series is used under conditions (1) to (26) in Table 4. (1) S-8533A15AFT (CPH6303/CPH6403) (2) S-8533A15AFT (Si3441DV/Si3442DV) 100 1 10 100 1000 10000 Output current (mA) Efficiency η (%) V IN = 2.7 V 5.0 V 100 1 10 100 1000 10000 Output current (mA) VIN = 2.7 V 5.0 V Efficiency η (%) (3) S-8533A33AFT (CPH6303/CPH6403) (4) S-8533A33AFT (Si3441DV/Si3442DV) 100 1 100 1000 10000 Output current (mA) V IN = 4.0 V 4.95 V 7.0 V Efficiency η (%) 100 1 100 1000 10000 Output current (mA) VIN = 4.0 V 4.95 V Efficiency η (%) (5) S-8533A33AFT (CPH6302/CPH6402) (6) S-8533A33AFT (Si3454DV/Si3455DV) 100 1 100 1000 10000 (mA) Output current V IN = 4.95 V 10 V Efficiency η (%) 100 1 100 1000 10000 (mA) Output current VIN = 4.95 V 10 V Efficiency η (%) (7) S-8533A50AFT (CPH6302/CPH6402) (8) S-8533A50AFT (Si3454DV/Si3455DV) 100 1 100 1000 10000 (mA) Output current V IN = 6.0 V 16 V 10 V 7.5 V Efficiency η (%) 100 1 100 1000 10000 (mA) Output current VIN = 6.0 V 16 V 10 V 7.5 V Efficiency η (%)
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8533 Series (9) S-8533A15AFT (CPH6303/CPH6403) (10) S-8533A15AFT (Si3441DV/Si3442DV) 100 1 10 100 1000 10000 Output current (mA) V IN 5.0 V Efficiency η (%) 100 1 10 100 1000 10000 Output current (mA) V IN = 2.7 V 5.0 V Efficiency η (%) = 2.7 V (11) S-8533A33AFT (CPH6303/CPH6403) ( 12) S-8533A33AFT (Si3441DV/Si3442DV) 100 1 100 1000 10000 (mA) Output current V IN = 4.0 V 4.95 V 7.0 V Efficiency η (%) 100 100 1000 10000 Output current (mA) 101 VIN = 4.0 V 4.95 V Efficiency η (%) (13) S-8533A33AFT (CPH6302/CPH6402) ( 14) S-8533A33AFT (Si3454DV/Si3455DV) 100 1 100 1000 10000 (mA) Output current V IN = 4.95 V 10 V Efficiency η (%) 100 1 10 100 1000 10000 Output current (mA) 10 V VIN = 4.95 V Efficiency η (%) (15) S-8533A50AFT (CPH6302/CPH6402) ( 16) S-8533A50AFT (Si3454DV/Si3455DV) 100 1 100 1000 10000 (mA) Output current V IN = 6.0 V 16 V 10 V 7.5 V Efficiency η (%) 100 1 100 1000 10000 (mA) Output current VIN = 6.0 V 16 V 10 V 7.5 V Efficiency η (%)
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 (17) S-8533A15AFT (CPH6303/CPH6403) ( 18) S-8533A15AFT (Si3441DV/Si3442DV) 100 1 100 1000 10000 (mA) Output current 5.0 V V IN = 2.7 V Efficiency η (%) 100 1 100 1000 10000 (mA) Output current V IN = 2.7 V 5.0 V Efficiency η (%) (19) S-8533A33AFT (CPH6303/CPH6403) ( 20) S-8533A33AFT (Si3441DV/Si3442DV) 100 1 100 1000 10000 (mA) Output current V IN = 4.0 V 4.95 V 7.0 V Efficiency η (%) 100 1 100 1000 10000 (mA) Output current VIN = 4.0 V 4.95 V Efficiency η (%) (21) S-8533A33AFT (CPH6302/CPH6402) ( 22) S-8533A33AFT (Si3454DV/Si3455DV) 100 1 100 1000 10000 (mA) Output current V IN = 4.95 V 10 V Efficiency η (%) 100 1 100 1000 10000 (mA) Output current 10 V VIN = 4.95 V Efficiency η (%) (23) S-8533A50AFT (CPH6302/CPH6402) ( 24) S-8533A50AFT (Si3454DV/Si3455DV) 100 1 100 1000 10000 (mA) Output current V IN = 6.0 V 16 V 10 V 7.5 V Efficiency η (%) 100 1 100 1000 10000 (mA) Output current VIN = 6.0 V 16 V 10 V 7.5 V Efficiency η (%)
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8533 Series (25) S-8533A33AFT (CPH6303/CPH6403) (26) S-8533A33AFT (CPH6302/CPH6402) 100 1 100 1000 10000 (mA) V IN = 4.95 V 7.0 V Output current Efficiency η (%) 100 1 10 100 1000 10000 (mA) Output current 13 V VIN = 10 V Efficiency η (%)
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S-8533 Series Rev.3.0_01 3. Output Current (I OUT) vs. Ripple Voltage (Vr) Characteristics The following shows the actual output current (I OUT) vs. ripple voltage (V r) characteristics when the S-8533 Series is used under conditions (27) to (34) in Table 5. (27) S-8533A15AFT (CPH6303/CPH6403) ( 28) S-8533A15AFT (Si3441DV/Si3442DV) 1 10 100 1000 10000 Output current (mA) V IN = 2.7 V 5.0 V Ripple voltage Vr (mV) 1 10 100 1000 10000 Output current (mA) Ripple voltage Vr( mV) VIN = 2.7 V 5.0 V (29) S-8533A33AFT (CPH6303/CPH6403) ( 30) S-8533A33AFT (Si3441DV/Si3442DV) 1 10 100 1000 10000 Output current (mA) VIN = 4.0 V 4.95 V Ripple voltage Vr( mV) 1 10 100 1000 10000 Output current (mA) V IN = 4.0 V 7.0 V 4.95 V Ripple voltage Vr (mV) (31) S-8533A33AFT (CPH6302/CPH6402) ( 32) S-8533A33AFT (Si3454DV/Si3455DV) 1 10 100 1000 10000 Output current (mA) VIN = 4.95 V 10 V Ripple voltage Vr( mV) 1 10 100 1000 10000 Output current (mA) V IN = 4.95 V 10 V Ripple voltage Vr (mV) (33) S-8533A50AFT (CPH6302/CPH6402) ( 34) S-8533A50AFT (Si3454DV/Si3455DV) 1 10 100 1000 10000 Output current (mA) VIN = 6.0 V 16 V7.5 V 10 V Ripple voltage Vr( mV) 1 10 100 1000 10000 Output current (mA) V IN = 6.0 V 16 V 7.5 V 10 V Ripple voltage Vr (mV)
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