CMOS IC For Switching Power Supply Control FA3629AV FA3629AV ■ Description ■ Dimensions, mm FA3629AV is a Power IC which includes DC-DC converter controller and Nch-power MOSFET. This IC can directly drive Nch/Pch MOSFET. This IC is suitable to reduce converter size because it has many functions in a small package TSSOP. Á TSSOP-16 9 5.2 0.2±0.05 0.5±0.08 1.1max 8 1 0~8˚ • Low input voltage: 2.5V to 6.5V • 40V CDMOS Process: Built-in 0.3Ω Nch-Power MOSFET(ch1, open drain) • 3-channels PWM Control: 2 boost circuits(ch1, ch2), 1 inverting circuit (ch3) • Adjustable soft start time and maximum duty cycle • Built-in timer latch for short circuit protection: Delay time = 216 / (switching frequency) • Built-in protection functions: Overcurrent limit for MOSFET, overheat protection, undervoltage lockout • Wide range of operation frequency: 100kHz to 1MHz • Package: TSSOP-16(Thin and small) 0.07±0.05 ■ Features 2 0.17+0.0 –0.04 4.4 6.4±0.1 16 0.65 ■ Applications • Power supply for general equipment ■ Block diagram Pin No. Pin symbol Description 1 FB1 IN1– Ch.1 output of error amplifier 2 3 IN2– Ch. 2 inverting input to error amplifier 4 GND PGND FB2 IN3– Ground of control blocks FB3 OUT3 OUT2 VCC OUT1 Ch. 3 output of error amplifier REG CT CS3 CS Regulated voltage output 5 6 7 8 9 10 11 12 13 14 15 16 Ch.1 inverting input to error amplifier Ground of large power blocks Ch. 2 output of error amplifier Ch. 3 inverting input to error amplifier Ch. 3 output (for Pch-MOSFET) Ch. 2 output (for Nch-MOSFET) Power supply Ch.1 drain output of internal Nch-MOSFET Oscillator timing capacitor Soft start for Ch. 3 Soft start for Ch.1 and Ch. 2 1 FA3629AV ■ Absolute maximum ratings Item Symbol ■ Recommended operating conditions Rating Unit Item Symbol Min. Max. Unit VCC Output voltage at OUT1 pin VOUT1 Output current at OUT1 pin*1 IOUT1 Source peak current of OUT2 IOUT2+ 6.5 V Power supply voltage 2.5 5.8 V 40 V Output voltage of OUT1 0 32 V 2.8 A Output current of OUT1 0 1.8 A –400 mA Oscillation frequency VCC VOUT1 IOUT1 fOSC 100 1000 kHz Sink peak current of OUT2 IOUT2- 400 mA Ambient temperature TOPR –20 85 °C IOUT3+ Sink peak current of OUT3 IOUT3Source average current of OUT2 IOUT2+ Sink average current of OUT2 IOUT2- –400 mA 50 mA Source average current of OUT3 IOUT3+ –50 mA Sink average current of OUT3 IOUT3- 50 mA Power supply voltage Source peak current of OUT3 Input voltage to err. amp. Total power dissipation*2 Ambient temperature Junction temperature Storage temperature 400 mA –50 mA VEI Pd TOPR 5.0 V 500 mW –25 to +95 °C TJ TSTG 125 °C –40 to +125 °C *1 Output current is limited by the overcurrent protection *2 Ta < 25°C ■ Electrical characteristics (VCC=3.0V, Ta=25°C) Reference voltage section Item Symbol Reference voltage VREF VREF-LINE VREF-TC1 VREF-TC2 Variation with supply voltage Variation with temperature Test condition Min. Typ. Max. Unit 0.98 1.00 1.02 V VCC=2.5 to 5.8V 1 3 mV Ta=–20 to +25°C 0.5 1.2 % Ta=+25 to +85°C 0.5 1.2 % Regulated voltage for internal control blocks Item Symbol Test condition Min. Typ. Max. Unit Regulated voltage CO=0.1µF VCC=2.5 to 5.8V 2.16 2.20 2.24 V 3 8 mV Variation with temperature VREG VREG-LINE VREG-TC1 0.5 1.5 % VREG-TC2 IREG Ta=+25 to +85°C 0.7 1.5 % Source current –15 mA Item Symbol Test condition Min. Typ. Max. Unit Oscillation frequency fOSC VOSCH VOSCL fdv fdT1 CT=150pF CT=150pF CT=150pF VCC=2.5 to 5.8V 480 550 620 1 2 % Ta=–20 to +25°C 5 7 % fdT2 Ta=+25 to +85°C 5 7 % Variation with supply voltage Ta=–20 to +25°C –40 Oscillator section High level voltage Low level voltage Variation with supply voltage Variation with temperature 2 kHz 1.38 V 0.78 V FA3629AV Soft-start and duty section Item Symbol Charge current of CS (Source) ICS ICS3 Dmax Dmax3 Charge current of CS3 (Sink) Max. duty cycle of OUT1 & OUT2 Max. duty cycle of OUT3 Invalid TL threshold voltage of CS Invalid TL threshold voltage of CS3 Test condition fOSC=500kHz fOSC=500kHz VCSLO VCSHI Min. Typ. Max. Unit –1.2 –1.0 –0.8 µA 0.8 1.0 1.2 µA 80 87 90 % 80 86 90 % 0.42 0.52 0.62 V 1.58 1.68 1.78 V Timer latch section (TL) Item Symbol Min. Typ. Max. Unit Threshold voltage of FB1 (Ch.1) VTLTH1 VTLTH2 1.58 1.68 1.78 V 1.58 1.68 1.78 V Threshold voltage of FB3 (Ch. 3) VTLTH3 0.42 0.52 0.62 V Start up count count – 216 – counts Start up time TTL CT=150pF 105 119 137 ms Item Symbol Test condition Min. Typ. Input offset voltage VIO VCOM Threshold voltage of FB2 (Ch. 2) Test condition Error amplifier section Common mode input voltage range DC open loop gain Unity gain band width Sink current (Ch.1) Source current (Ch.1) Sink current (Ch. 2) Source current (Ch. 2) Sink current (Ch. 3) AVO fT IOL1 IOH1 IOL2 0.2 VFB1=0.5V VFB1= VREG –0.5V VFB2=0.5V IOH2 IOL3 IOH3 IOL-TC1 IOL-TC2 VFB2= VREG –0.5V VFB3=0.5V VFB3= VREG –0.5V Max. Unit 10 mV 1.5 V 70 75 80 dB 1.0 1.7 2.0 MHz 1.0 1.5 2.0 mA –160 –120 –80 µA 0.5 0.7 0.9 mA –160 –120 –80 µA 1.0 1.5 2.0 mA –160 –120 –80 µA Ta=–20 to +25°C 20 % Ta=+25 to +85°C 20 % IOH-TC1 IOH-TC2 Ta=–20 to +25°C 20 % Ta=+25 to +85°C 20 % Item Symbol Test condition Min. Typ. Max. Unit Threshold current IOCDTH VCC=3.0V VCC=5.0V 1.4 1.8 2.0 A 1.8 2.0 2.2 A Delay time fOCD 100 200 400 ns Min. Typ. Max. Unit 125 135 145 °C Source current (Ch. 3) Sink current variation with temperature Source current variation with temperature Overcurrent protection section (OCP) Overheat protection section (OHP) Item Symbol Threshold temperature TOH Test condition Undervoltage lockout circuit section (UVLO) Item Symbol Threshold voltage of REG VUVTH Test condition Min. Typ. Max. Unit 1.95 2.05 2.15 V 3 FA3629AV Output section (OUT1) Item Symbol Test condition Min. Typ. Max. Unit On resistance of MOSFET RON1 tr tf VCC=3.0V, IO1=200mA VCC=3.0V VOUT1=10V, I O1=1.0A 0.25 0.275 0.3 Ω 25 35 ns 25 35 ns Item Symbol Test condition Min. Typ. Max. Unit Rise time of OUT2 tr2 tf2 tr3 tf3 VCC=3V, CO2=1000pF 20 25 35 ns (Between OUT2-GND) 20 25 35 ns VCC=3V, CO3=1000pF 20 25 35 ns (Between VCC-OUT3) 20 25 35 ns R2AH R2AL R3AH R3AL R2AH VCC=3V, IOUT2=–150mA VCC=3V, IOUT2=150mA VCC=3V, IOUT3=–150mA VCC=3V, IOUT3=150mA VCC=5V, IOUT2=–150mA 2.5 4.0 5.5 Ω Ω R2AL R3AH R3AL VCC=5V, IOUT2=150mA VCC=5V, IOUT3=–150mA VCC=5V, IOUT3=150mA Item Symbol Test condition Operating current (Overall) ICCA ICTRL D=50%, fOSC=500kHz Rise time of OUT1 Fall time of OUT1 Output section (OUT2, OUT3) Fall time of OUT2 Rise time of OUT3 Fall time of OUT3 High level on resistance of OUT2 Low level on resistance of OUT2 High level on resistance of OUT3 Low level on resistance of OUT3 High level on resistance of OUT2 Low level on resistance of OUT2 High level on resistance of OUT3 Low level on resistance of OUT3 2.5 4.0 5.5 2.5 4.0 5.5 Ω 2.5 4.0 5.5 Ω 2.0 3.5 5.0 Ω 2.0 3.5 5.0 Ω 2.0 3.5 5.0 Ω 2.0 3.5 5.0 Ω Min. Typ. Max. Unit 3.0 3.8 mA Overall device Operating current of control blocks 4 1.8 mA FA3629AV ■ Characteristic curves (Ta=25°C) Supply current (ICC) vs oscillation frequency (fOSC) Oscillation frequency (fOSC) vs. timing capactior(CT) VCC=6.0V 6 1000 fosc [kHZ] ICC [mA] VCC=5.0V 4 VCC=3.0V VCC=2.5V 2 100 0 200k 800k 500k 1000 100 fosc [kHZ] CT [pF] Oscillation frequency (fOSC) vs. ambient temperature (Ta) Max. on duty cycle vs. oscillation frequency (fOSC) 100 700 Maximum on duty cycle [%] 650 fosc [kHz] 600 550 500 90 CH.1, 2 80 CH. 3 450 400 25 0 25 50 75 70 100 500 100 1000 fosc [kHz] Ta [°C] Oscillation peak voltage vs. timing capactior(CT) Error amplifier voltage gain (Av) /phase vs. frequency (f) Condition: Open loop 2 100 180 90 80 150 70 120 1 Minimum peak voltage AV [dB] Voltage [V] 60 Av 50 90 Phase 40 60 30 20 30 10 0 0 – 10 – 30 – 20 0 500 100 CT [pF] 1000 – 30 100 Phase [deg] Maximum peak voltage 1K 100K 10K 1M – 60 10M f [HZ] 5 FA3629AV Output (Ch. 2) duty cycle vs FB terminal voltage (VFB) Output (Ch. 3) duty cycle vs. FB3 terminal voltage (VFB3) 100 100 fOSC=150kHZ fOSC=150kHZ 90 90 fOSC=800kHZ 70 60 50 40 30 Output (CH. 3) duty cycle [%] Output (CH. 2) duty cycle [%] fOSC=550kHZ 80 60 50 40 30 20 10 10 0.5 0.7 0.9 1.1 fOSC=800kHZ 70 20 0 fOSC=550kHZ 80 0 1.3 0.5 1.5 0.7 FB [V] 0.9 1.1 H-level output voltage (VOH) vs output source current (ISO) OUT2, OUT3 4.0 4.0 VCC=5.0V VCC=5.0V VOL [V] VCC– VOH [V] 1.5 L-level output voltage (VOL) vs. output sink current (ISI) OUT2, OUT3 2.0 2.0 VCC=3.0V VCC=3.0V 0 0 – 400 – 200 ISO [mA] 6 1.3 FB3 [V] 0 0 200 ISI [mA] 400 FA3629AV ■ Application circuit Parts tolerances characteristics are not defined in the circuit design sample shown above. When designing an actual circuit for a product, you must determine parts tolerances and characteristics for safe and economical operation. 7