AN8049FHN PANASONIC

Document overview

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Technical content

1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC n Overview The AN8049FHN is a three-channel PWM DC-DC converter control IC that features low-voltage operation. This IC can form a power supply that provides two step- up outputs and one step-down or polarity inverted output with a minimal number of external components. Minimal operating supply voltage of this IC is as low as 1.8 V, so that it can operate from 2 dry-batteries. And also, it is housed in an ultrathin, 4-directional- lead SMD-package whose thickness is 0.8 mm maximum and pin-pitch is 0.5 mm therefore it is most suitable for making a power supply small and thin. n Features

  • Wide operating supply voltage range: 1.8 V to 14 V
  • High-precision reference voltage circuit — V REF pin voltage: –1% — Error amplifier: –1.5%
  • Ultrathin surface mounting package for miniaturized and thinner power supplies Package: QFN-24 0.5-mm lead pitch 5.4 mm · 4.4 mm · t 0.8 mm
  • Supports control over a wide output frequency range: 20 kHz to 1 MHz
  • On/off (sequence control) pins provided for each channel for easy sequence control setup
  • The negative supply error amplifier supports 0-volt input. Common-mode input voltage range: - 0.1 V to V CC -1.4 V This allows the number of external components to be reduced by two resistors.
  • Fixed duty factor: 86% However, the duty can be adjusted to anywhere from 0% to 100% with an external resistor.
  • Timer latch short-circuit protection circuit (charge current: 1.1 mA typical)
  • Low input voltage malfunction prevention circuit (U.V.L.O.) (operation start voltage: 1.67 V typical)
  • Standby function (active-high control input, standby mode current: 1 mA maximum) n Applications
  • Electronic equipment that requires a power supply system QFN024-P-0405 Unit: mm /, /,/, /, /,/, 5.0±0.1 3-C0.5 19 13 4.0±0.1 Seating plane R0.3 4.0±0.1 2.0±0.2 (1.10) 4.2±0.2 3.0±0.1 A B 0.2±0.1 0.80max. S 0.50 0.2±0.1 0.10 S S A BM 0.10

AN8049FHN Voltage Regulators n Pin Descriptions Pin No. Description

1 DT2

2 DT1

3 CTL3

4 CTL2

5 CTL1

6 Off

8 RB2

9 RB1

10 OUT1

11 OUT2

12 GND

Pin No. Description

13 OUT3

14 V CC

15 OSC

16 IN +3

17 IN -3

18 FB3

19 IN -2

20 FB2

21 IN -1

22 FB1

23 S.C.P.

24 DT3

20 kW 1.1 mA 1.26 V CTL3 DT3 IN-3 17IN+3 FB3 S.C.P. RB1 OUT1 OUT3 RB2 OUT2 GND IN-2 FB2 1.26 V Error amplifier 3 CTL2 DT2 11.26 V 1.26 V 1.1 mA 1.1 mA 1.1 mA 0.9 V Error amplifier 1 Error amplifier 2 50 kW50 kW V REF V CC 50 kW 50 kW V CCOn/off control Reference voltage supply V REF Triangular wave generator 0.7 V 0.3 V 1.26 V (Allowance: –1%) S.C.P. comp. Latch U.V .L.O. R S Q 1.26 V

1.26 V20 kW

Voltage Regulators AN8049FHN Note) *1: Ta = 85°C. For the independent IC without a heat sink. *2: When VCC is less than 6 V, VIN-1 and VIN+2 must be VCC . n Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage V CC 14.2 V Off pin allowable application voltage VOFF 14.2 V Error amplifier input allowable V IN V CC V application voltage *2 OUT1 and OUT2 pin output I SO(OUT) -50 mA source current OUT3 pin output current I SI(OUT) +50 mA Power dissipation *1 PD 111 mW Operating temperature T opr -30 to +85 °C Storage temperature T stg -55 to +150 °C n Recommended Operating Range Parameter Symbol Range Unit Off pin application voltage V OFF 0 to 14 V OUT1 and OUT2 pin output source current I SO(OUT) -40 (min.) mA OUT3 pin output current I SI(OUT) 40 (max.) mA Timing resistance R T 3 to 33 kW Timing capacitance C T 100 to 1 000 pF Oscillator frequency f OUT 20 to 1 000 kHz Short-circuit protection time-constant setting capacitance CSCP 1 000 (min.) pF Output current setting resistance R B 750 to 15 000 W

AN8049FHN Voltage Regulators Parameter Symbol Conditions Min Typ Max Unit Reference voltage block Reference voltage V REF IREF = - 0.1 mA 1.247 1.26 1.273 V Line regulation with input fluctuationLine V CC = 1.8 V to 14 V ¾ 22 0 m V Load regulation Load I REF = -0.1 mA to -1 mA -20 -3 ¾ mV V REF temperature characteristics VRFEdT Ta = -30°C to +85°C ¾ 1 ¾ % V REF pin short-circuit current I OC ¾- 10 ¾ mA U.V.L.O. block Circuit operation start voltage VUON 1.59 1.67 1.75 V Error amplifier 1 block Input threshold voltage 1 V TH1 1.241 1.26 1.279 V Input bias current 1 I B1 ¾ 0.1 0.2 mA High-level output voltage 1 V EH1 1.0 1.2 1.4 V Low-level output voltage 1 V EL1 ¾¾ 0.2 Output source current 1 I SO(FB)1 -38 -31 -24 mA Output sink current 1 I SI(FB)1 0.5 ¾¾ mA V TH temperature characteristics 1 VTHdT1 Ta = -30°C to +85°C ¾ 1.5 ¾ % Open-loop gain 1 A V1 ¾ 80 ¾ dB Error amplifier 2 block Input threshold voltage 2 V TH2 1.241 1.26 1.279 V Input bias current 2 I B2 ¾ 0.1 0.2 mA High-level output voltage 2 V EH2 1.0 1.2 1.4 V Low-level output voltage 2 V EL2 ¾¾ 0.2 Output source current 2 I SO(FB)2 -38 -31 -24 mA Output sink current 2 I SI(FB)2 0.5 ¾¾ mA V TH temperature characteristics 2 VTHdT2 Ta = -30°C to +85°C ¾ 1.5 ¾ % Open-loop gain 2 A V2 ¾ 80 ¾ dB Error amplifier 3 block Input offset voltage V IO -6 ¾ 6m V Common-mode input voltage range VICR - 0.1 ¾ V CC V -1.4 Input bias current 3 I B3 - 0.6 - 0.3 ¾m A High-level output voltag 3 V EH3 1.0 1.2 1.4 V Low-level output voltage 3 V EL3 ¾¾ 0.2 Output source current 3 I SO(FB)3 -38 -31 -24 mA Output sink current 3 I SI(FB)3 0.5 ¾¾ mA Open-loop gain 3 A V3 ¾ 80 ¾ dB n Electrical Characteristics at VCC = 2.4 V, CREF = 0.1 mF, Ta = 25°C

Voltage Regulators AN8049FHN n Electrical Characteristics (continued) at VCC = 2.4 V, CREF = 0.1 mF, Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Oscillator block Oscillator frequency f OUT R T = 7.5 kW , CT = 680 pF 170 190 210 kHz Frequency supply voltage f DV R T = 7.5 kW , CT = 680 pF ¾ 1 ¾ % characteristics Frequency temperature f DT R T = 7.5 kW , CT = 680 pF ¾ 3 ¾% characteristics Output 1 block Output duty factor 1 Du 1 R T = 7.5 kW , CT = 680 pF 80 86 92 % High-level output voltage 1 V OH1 IO = -10 mA, RB = 1 kW V CC -1 ¾¾ V Low-level output voltage 1 V OL1 IO = 10 mA, RB = 1 kW¾ ¾ 0.2 V Output source current 1 I SO(OUT)1 V O = 0.7 V, RB = 1 kW- 32 -27 -22 mA Output sink current 1 I SI(OUT)1 V O = 0.7 V, RB = 1 kW 40 ¾¾ mA Pull-down resistor 1 R O1 20 30 40 k W Output 2 block Output duty factor 2 Du 2 R T = 7.5 kW , CT = 680 pF 80 86 92 % High-level output voltage 2 V OH2 IO = -10 mA, RB = 1 kW V CC -1 ¾¾ V Low-level output voltage 2 V OL2 IO = 10 mA, RB = 1 kW¾ ¾ 0.2 V Output source current 2 I SO(OUT)2 V O = 0.7 V, RB = 1 kW- 32 -27 -22 mA Output sink current 2 I SI(OUT)2 V O = 0.7 V, RB = 1 kW 40 ¾¾ mA Pull-down resistor 2 R O2 20 30 40 k W Output 3 block Output duty factor 3 Du 3 R T = 7.5 kW , CT = 680 pF 80 86 92 % Output saturation voltage V O(SAT) ¾¾ 0.2 V Short-circuit protection circuit block Input standby voltage V STBY ¾¾ 0.1 V Input threshold voltage V THPC 0.8 0.9 1.0 V Input latch voltage V IN ¾¾ 0.1 V Charge current I CHG V SCP = 0 V -1.3 -1.0 -0.7 mA Comparator threshold voltage V THL ¾ 1.26 ¾ V On/off control block Input threshold voltage V ON(TH) 0.7 1.0 1.3 V Off pin current I OFF V OFF = 5 V ¾ 35 ¾m A CTL block Input threshold voltage V THCTL 1.07 1.26 1.47 V Charge current I CTL V CTL = 0 V -1.3 -1.0 -0.7 mA Whole device Average consumption current I CC(OFF) R B = 9.1 kW , duty = 50% ¾ 4.2 5.5 mA Standby mode current I CC(SB) ¾¾ 1 mA

AN8049FHN Voltage Regulators Pin No. Equivalent circuit Description I/O

1 DT2: I

Sets the channel 2 soft start time. Set the time by connecting a capacitor between this pin and ground. Note that although the channel 2 maximum on duty is set internally to 86%, the maximum on duty can be set to a value of 86% or less by inserting a resistor between this pin and ground, and can be set to a value of 86% or more by inserting a resistor between this pin and the VREF pin.

2 DT1:

Sets the channel 1 soft start time. Set the time by connecting a capacitor between this pin and ground. Note that although the channel 1 maximum on duty is set internally to 86%, the maximum on duty can be set to a value of 86% or less by inserting a resistor between this pin and ground, and can be set to a value of 86% or more by inserting a resistor between this pin and the VREF pin.

3 CTL3: I

Controls the on/off state of channel 3. A delay can be provided in the power supply turn-on start time by connecting a capacitor between this pin and ground. tDLY3 = 1.26 (V) · CCTL3 (mF)/1.1 (mA) (s) This pin can also be used to control the on/off state with an external signal. In that case, the allowable input voltage range is from 0 V to V CC . Note that during U.V.L.O. and timer latch operation, this pin is connected to ground through a 20 kW resistor. n Terminal Equivalent Circuit PWM250 kW 50 kW 7 1520 PWM1 50 kW 50 kW 15227 1.26 V V CC 20 kW 1.1 mA High channel 3 operation is turned off.

Voltage Regulators AN8049FHN Pin No. Equivalent circuit Description I/O

4 CTL2: I

Controls the on/off state of channel 2. A delay can be provided in the power supply turn-on start time by connecting a capacitor between this pin and ground. tDLY2 = 1.26 (V) · CCTL2 (mF)/1.1 (mA) (s) This pin can also be used to control the on/off state with an external signal. In that case, the allowable input voltage range is from 0 V to V CC . Note that during U.V.L.O. and timer latch operation, this pin is connected to ground through a 20 kW resistor.

5 CTL1: I

Controls the on/off state of channel 1. A delay can be provided in the power supply turn-on start time by connecting a capacitor between this pin and ground. tDLY1 = 1.26 (V) · CCTL1 (mF)/1.1 (mA) (s) This pin can also be used to control the on/off state with an external signal. In that case, the allowable input voltage range is from 0 V to V CC . Note that during U.V.L.O. and timer latch operation, this pin is connected to ground through a 20 kW resistor.

6 Off: I

Controls the on/off state. When the input is high: normal operation OFF > 1.2 V) When the input is low: standby mode V OFF < 0.6 V) In standby mode, the total current consumption is held to under 1 mA. 7V REF :O Outputs the internal reference voltage. The reference voltage is 1.26 V (allowance: –1%) when VCC is 2.4 V and IREF is -0.1 mA. Insert a capacitor of at least 0.1 mF between VREF and ground for phase compensation. 1.26 V V CC 20 kW 1.1 mA High channel 2 operation is turned off. n Terminal Equivalent Circuit (continued) 1.26 V V CC 20 kW 1.1 mA High channel 1 operation is turned off. 5100 kW Start and stop of internal circuits. V CC

AN8049FHN Voltage Regulators Pin No. Equivalent circuit Description I/O

8 RB2: I

Connection for a resistor that sets the channel 2 output source current. Use a resistor in the range 750 W to 1.5 kW .

9 RB1: I

Connection for a resistor that sets the channel 1 output source current. Use a resistor in the range 750 W to 1.5 kW .

10 OUT1: O

Push-pull output. The absolute maximum rating for the output source current is -50 mA. Connecting the external resistor to RB1 terminal allows this circuit to provide an output source current with excellent line regulation and minimal sample-to- sample variations.

11 OUT2: O

Push-pull output. The absolute maximum rating for the output source current is -50 mA. Connecting the external resistor to RB2 terminal allows this circuit to provide an output source current with excellent line regulation and minimal sample-to- sample variations.

12 GND: ¾

Ground. n Terminal Equivalent Circuit (continued) V CC 200 W 30 kW V CC 200 W 30 kW V CC 30 kW ISO(OUT)1 V CC 30 kW ISO(OUT)2

Voltage Regulators AN8049FHN Pin No. Equivalent circuit Description I/O

13 OUT3: O

Open-collector output. The absolute maximum rating for the output current is +50 mA.

14 V CC : ¾

Power supply terminal. Provide the operating supply voltage in the range 1.8 V to 14 V.

15 OSC: O

Connection for the capacitor and resistor that determine the oscillator frequency. Use a capacitor in the range 100 pF to 1 000 pF and a resistor in the range 3 kW to 33 kW . Use an oscillator frequency in the range 20 kHz to 1 MHz.

16 IN+3: I

Noninverting input to the error amplifier 3.

17 IN -3: I

Inverting input to the error amplifier 3.

18 FB3: O

Output from the error amplifier 3. This circuit can provide a source current of -31 mA or a sink current of 0.5 mA (minimum).

19 IN -2: I

Inverting input to the error amplifier 2. n Terminal Equivalent Circuit (continued) V CC 0.2 V V CC Latch S R Q 31 mA 0.5 mA min. OSC PWM316 1.26 V 1.5 kW V CC 1.5 kW 1.5 kW 1617

AN8049FHN Voltage Regulators Pin No. Equivalent circuit Description I/O

20 FB2: O

Output from the error amplifier 2. This circuit can provide a source current of -31 mA or a sink current of 0.5 mA (minimum).

21 IN -1: I

Inverting input to the error amplifier 1.

22 FB1: O

Output from the error amplifier 1. This circuit can provide a source current of -31 mA or a sink current of 0.5 mA (minimum). 23 S.C.P.: O Connection for the capacitor that sets the timer latch short-circuit protection circuit time constant. Use a capacitor with a value of 1 000 pF or higher. The charge current I CHG is 1.1 mA typical.

24 DT3: I

Sets the channel 3 soft start time. Set the time by connecting a capacitor between this pin and ground. Note that although the channel 3 maximum on duty is set internally to 86%, the maximum on duty can be set to a value of 86% or less by inserting a resistor between this pin and ground, and can be set to a value of 86% or more by inserting a resistor between this pin and the V REF pin. n Terminal Equivalent Circuit (continued) 31 mA 0.5 mA min. V CC 1.26 V OSC PWM2 1.26 V V CC Latch S R Q 1.1 mA 1.5 kW Output shutoff 50 kW 50 kW PWM324 7 18 15 31 mA V CC 1.26 V OSC PWM121 0.5 mA min. 1.26 V 1.5 kW

Voltage Regulators AN8049FHN n Usage Notes [1] Allowable power dissipation Since the power dissipation (P) in this IC increases proportionally with the supply voltage, applications must be careful to operate so that the loss does not exceed the allowable power dissipation, PD , for the package. Reference formula: P = (V CC -V BEQ1 ) · ISO(OUT)1 · Du1 ‹ Power dissipation in the channel 1 output stage +(VCC -V BEQ2 ) · ISO(OUT)2 · Du2 ‹ Power dissipation in the channel 2 output stage +V O(SAT)3 · IOUT3 · Du3 ‹ Power dissipation in the channel 3 output stage +V CC · ICC ‹ Power dissipation between VCC and ground <PD V BEQ1 : The voltage between the base and emitter of the npn transistor Q1 ISO(OUT)1 : The OUT1 pin output source current (When R RB1 is 1 kW , ISO(OUT)1 will be 38 mA, maximum.) Du 1 : The output 1 duty factor V BEQ2 : The voltage between the base and emitter of the npn transistor Q2 ISO(OUT)2 : The OUT2 pin output source current (When R RB2 is 1 kW , ISO(OUT)2 will be 38 mA, maximum.) Du 2 : The output 2 duty factor V O(SAT)3 : The OUT3 pin saturation voltage (0.5 V maximum when OUT1 is 40 mA.) IOUT3 : The OUT3 pin current (This will be {VCC - VBEQ3 - VO(SAT)3 }/RO3 .) Du 3 : The output 3 duty factor ICC : The VCC pin current [2] Allowable VCC ripple V CC ripple due to the switching transistor being turned on and off can cause this IC's U.V.L.O. circuit, which is biased by VCC , to operate incorrectly, and can cause the S.C.P. capacitor charging operation to fail to start when the output is shorted. The figure shows the allowable range for VCC ripple. Applications should reduce VCC ripple to be within this range, either by inserting a ripple filter in the VCC line or by inserting a capacitor between the IC GND and VCC pins and locating that capacitor as close to the IC as possible. Note that the allowable range shown here is the result of testing the IC alone and that the allowable range may differ depending on the actual structure of the power supply circuit. Also note that this allowable range is a design target, and is not guaranteed by testing of all samples. Allowable V CC ripple Ripple frequency (Hz) 10 M 1 M 100 k 10 k V CC ripple voltage VCC (AC) (V[p-p]) 012345678 Allowable range when VCC is 3 V . Allowable range when V CC is 10 V .

AN8049FHN Voltage Regulators n Application Notes [1] QFN024-P-0405 package power dissipation PD ¾ Ta Power dissipation PD (W) Ambient temperature Ta (°C) 0.000 0 25 50 75 85 100 125 1.200 1.075 1.000 0.800 0.600 0.660 0.400 0.200 0.279 Independent IC without a heat sink R th(j-a) = 357.4°C/W When mounted on a 4-layer printed circuit board (50·50·t0.8 mm3) R th(j-a) = 93.0°C/W When mounted on a standard printed circuit board (glass epoxy: 50·50·t0.8 mm R th(j-a) = 151.5°C/W

Voltage Regulators AN8049FHN n Application Notes (continued) [2] Main characteristics Timing capacitance ¾ Oscillator frequency fOSC ¾ Maximum output duty (RT = 3 kW ) fOSC ¾ Maximum output duty (RT = 7.5 kW ) 10k 10p 1n 10n C T (F) fOUT (Hz)100k R T = 3 kW R T = 33 kW R T = 7.5 kW 1M100k10k fOSC (Hz) Du 1 , Du2 , Du3 (%) Du 1 , Du2 Du 3 1M100k10k fOSC (Hz) Du 1 , Du2 , Du3 (%) Du 1 , Du2 Du 3 fOSC ¾ Maximum output duty (RT = 33 kW ) 1M100k10k fOSC (Hz) Du 1 , Du2 , Du3 (%) Du 3 Du 1 Du 2 R B ¾ ISO(OUT) R B ¾ ISI(OUT) 100 100k10k1k100 R B (W ) ISI(OUT) (mA) 1.8 V , 2.4 V 8 V V CC = 14 V -10 -20 -30 -40 -50 -60 -70 -80 100k10k1k100 R B (W ) ISO(OUT) (mA) V CC = 1.8 V 2.4 V 14 V 8 V

AN8049FHN Voltage Regulators n Application Notes (continued) [3] Timing charts Output short 1.26 V 0.9 V FB OSC DT 1.67 V 1.26 V V CC pin voltage waveform S.C.P. pin voltage waveform CTL pin voltage waveform OUT1/2 pin voltage waveform Totem pole circuit output (Step-up output) OUT3 pin voltage waveform Open-collector output (Inverting or step-down output)

Voltage Regulators AN8049FHN n Application Notes (continued) [4] Function descriptions (continued) This circuit protects the system against degradation or destruction due to incorrect control operation when the power supply voltage falls during power on or power off. The low input voltage malfunction prevention circuit detects the internal reference voltage that changes with the supply voltage level. While the supply voltage is rising, this circuit cuts off the output drive transistor until the 23) and the DT pins (pins 1, 2, and 24) at 0 V, and the OSC pin (pin 15) at about 1.2 V. 8. PWM comparators The PWM comparators control the on-period of the output pulse according to their input voltage. The output transistors are turned on during periods when the OSC pin (pin 15) triangular wave is lower than both of the corresponding FB pin (pins 18, 20, or 22) and the corresponding DT pin (pins 1, 2, or 24). The PWM 2 circuit turns the output transistor on during periods when OSC pin (pin 15) triangular wave is at a higher level than both of the FB2 pin (pin 20) and the DT2 pin (pin 1). The maximum duty is set to 86% internally, but it can be set to a value lower than 86% by inserting a resistor between the corresponding DT pin and ground, and can be set to a value higher than 86% by inserting a resistor between the corresponding DT pin and the V REF pin. The IC's soft start function operates to gradually increase the width of the output pulse on-period during startup if a capacitor is inserted between the DT pin and ground. 9. Output 1 and output 2 blocks These output circuits have a totem pole structure. A constant-current source output with good line regulation can be set up freely by connecting current setting resistors to the RB pins. These circuits can provide a constant-current source output of up to 50 mA. 10. Output 3 block This output circuit has an open collector structure. An output current of up to 50 mA can be provided, and the output pin has a breakdown voltage of 15 V. 11. CTL block The CTL block output circuit also has a totem pole structure. A constant-current source output with good line regulation can be set up freely by connecting current setting resistors to the RB2 pin. The CTL block can provide a constant-current source output of up to 50 mA.

comparator continuously compares a 0.9 V reference voltage with the FB1, FB2, and FB3 error amplifier outputs. be in the conducting state, and the S.C.P. pin will be held at 0 V. SCP connected to the S.C.P. pin will start to charge. is turned off or the power supply is restarted using on/off control.

1.26 V = I

Figure 5. S.C.P. pin charging waveform Figure 6. Short-circuit protection circuit

to each other as shown in figure 7, the ICs will operate at the same frequency. possible to turn all the ICs on or off at the same time remotely. Figure 7. Slave operation circuit example

Delays can be provided in the startup times by inserting capacitors (CCTL ) between the CTL pins and ground. signals may have voltages in the range 0 V to VCC . Figure 8. Sequential operation

Voltage Regulators AN8049FHN n Application Notes (continued) [8] Differences between this IC and the AN8049SH The pin arrangements differ. The AN8049SH is an alternative package version of this IC. CTL1 Off V REF RB2 RB1 OUT1 CTL2 CTL3 DT1 DT2 DT3 S.C.P. IN+3 OSC V CC OUT3 GND OUT2 IN-3 FB3 IN-2 FB2 IN-1 FB1 AN8049SH IN-2 FB3 IN-3 IN+3 OSC V CC OUT3 DT2 1 DT1 CTL3 CTL2 CTL1 Off V REF RB1 OUT1 OUT2 GND RB28 FB2 IN-1 FB1 22 S.C.P. 23 DT3 24 AN8049FHN

AN8049FHN Voltage Regulators -45 -135 -180 -90 -225 Phase (°) Frequency (Hz) 100M100k 1M 10M10k1k -10 -20 Gain (dB) Amp.3 1 kW 100 kW 1 kW 1 kW 10 mF 10 mF FB3 V OUT 1 V V IN 4 mV[p-p] IN-3 IN+3 n Application Notes (continued) [9] Error amplifier frequency characteristics 1. Error amplifiers 1 and 2 (Test circuit) 180 135 -45 Phase (°) Frequency (Hz) 100M100k 1M 10M10k1k -10 -20 Gain (dB) Amp.1 V REF 1.26 V 100 kW 100 kW 1 kW10 mF FB1 V OUT 2.3 V V IN 4 mV[P-P] IN-1 2. Error amplifier 3 (Test circuit)

Voltage Regulators AN8049FHN n Application Circuit Example IN-2 FB3 IN-3 IN+3 OSC V CC V IN V O3 V O1 V O1 OUT3 DT2 1 DT1 CTL3 CTL2 CTL1 Off V REF RB1 OUT1 OUT2 GND RB28 FB2 IN-1 FB1 22 S.C.P. 23 DT3 24 V REF