FA3621

FA3621F FUJI | Alldatasheet

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Technical content

n Dimensions, mm \` LQFP-48 0~7˚ 9.0–0.3 0.10–0.06 0.5–0.1 0.2–0.06 0.127 –0.05 1.45 max 7.0 11 2 36 25 48 37 13 24 9.0–0.3 0.5–0.2 7.0 7.8 8.0 CMOS IC For Switching Power Supply Control n Description FA3621F is a control IC for 6-channel DC-DC converter. This IC can directly drive a Nch/Pch-MOSFET. This IC is suitable to reduce converter size because it has many functions in a small package LQFP-48. n Features

• 6-channel PWM control with MOSFET direct driving : 5-channel for Pch-MOSFET, 1channel for Nch-MOSFET
• Low input voltage: 4.5V to 20V
• –1.5% high accuracy bandgap reference
• Low power consumption by means of CDMOS Standby mode: 10mA(max.) Operating mode: 6mA(max.)
• Soft start function for each channel
• ON/OFF function for each channel
• Timer latch for short protection
• Overheat protection
• Undervoltage lockout
• Wide range of operation frequency: 50kHz to 1MHz
• Package: LQFP-48(Thin and small) n Application
• VTR-camera, digital-steel-camera and portable equipment FA3621F

2.67V Bias UVLO Error Amp. Over- heat protection VREF CREF VREG VCC1 VCC2 VDRV OUT1 (OPEN) DT1 DT2 OUT2 OUT3 OUT4 OUT5 OUT6b OUT6a GND1 GND2 OSCSoft startON/OFF SYN CT2 RT CTI FB1 IN1– FB2 IN2– FB3 IN3– IN3+ FB4 IN4– IN4+ FB5 IN5– FB6 IN6– IN5+ CP 32 31 30 23 125 2635 34 33 28 27 Hi Hi 125 CNT1 CNT2 CNT3/4 CNT5 CNT6 CS1 CS2 CS3/4 CS5 CS6 OHP UVLO

n Recommended operating conditions Item Symbol Min. Max. Unit Power supply voltage VCC 4.5 18.0 V Input voltage for logic input VLOG 0.0 5.25 V Oscillation frequency fOSC 50 1000 kHz Oscillator timing resistor R T 6.8 100 k W Oscillator timing capacitor C T 68 1000 pF CREF terminal by-pass capacitor C REF 0.01 mF VREF terminal output current IREF –60 0 mA Pin Pin Description No. symbol

1 RT Oscillator timing resistor

2 CT2 (Not connect any component)

3 CT1 Oscillator timing capacitor

4 VREF Reference voltage output

5 CREF Capacitor for reference voltage output

6 CP Timing capacitor for timer latch delay

7 FB4 Ch. 4 output of error amplifier 8 IN4+ Ch. 4 non-inverting input to error amplifier 9 IN4– Ch. 4 inverting input to error amplifier 10 IN3– Ch. 3 inverting input to error amplifier 11 IN3+ Ch. 3 non-inverting input to error amplifier

12 VREG Regulated voltage output

13 FB3 Ch. 3 output of error amplifier 14 IN2– Ch. 2 inverting input to error amplifier 15 FB2 Ch. 2 output of error amplifier 16 IN1– Ch. 1 inverting input to error amplifier 17 FB1 Ch. 1 output of error amplifier 18 FB5 Ch. 5 output of error amplifier 19 IN5+ Ch. 5 non-inverting input to error amplifier 20 IN5– Ch. 5 inverting input to error amplifier 21 IN6– Ch. 6 inverting input to error amplifier

22 GND1 Ground

23 OUT6b ON/OFF switch for ch.6 power supply 24 FB6 Ch. 6 output of error amplifier n Absolute maximum ratings Item Symbol Rating Unit Power supply voltage VCC 20.0 V Source peak current IOUT –200 mA Sink peak current IOUT 200 mA Output peak current of OUT6b IOUT6b –500 mA Input voltage for analog input VANA –0.3 to +2.8 V Input voltage for logic input VLOG –0.3 to +5.5 V Total power dissipation * Pd 550 mW Junction temperature TJ 125 °C Ambient temperature TOP –20 to +85 °C Storage temperature Tstg –40 to +125 °C * Ta < 25°C Pin Pin Description No. symbol 25 CS5 Soft start for Ch. 5 26 CS6 Soft start for Ch. 6 27 CNT6 Ch. 6 ON/OFF function 28 CNT5 Ch. 5 ON/OFF function

29 VCC2 Power supply for output stage

30 CS3/4 Soft start for Ch. 3 & Ch. 4 31 CS2 Soft start for Ch. 2 32 CS1 Soft start for Ch. 1 33 CNT3/4 Ch. 3 & Ch. 4 ON/OFF function 34 CNT2 Ch. 2 ON/OFF function 35 CNT1 Ch. 1 ON/OFF function

36 SYN (Connect to GND1/ GND2 terminal)

37 VDRV Bias for logic circuit of outputs

38 OUT5 Ch. 5 output (for Pch-MOSFET) 39 OUT6a Ch. 6 output (for Nch-MOSFET) 40 (OPEN) (Not connect any component) 41 OUT1 Ch. 1 output (for Pch-MOSFET)

42 GND2 Ground

43 OUT2 Ch. 2 output (for Pch-MOSFET) 44 OUT3 Ch. 3 output (for Pch-MOSFET) 45 OUT4 Ch. 4 output (for Pch-MOSFET)

46 VCC1 Power supply for control circuit

47 DT2 (Connect to DT1)

48 DT1 (Connect to DT2)

Item Symbol Test condition Min. Typ. Max. Unit Oscillation frequency fOSC R T=18kW , C T=100pF 414 460 506 kHz Frequency variation due to supply voltage change fdV VCC =4.5 to 18V –1 –3% Frequency variation due to temperature change fdT Ta=–20 to +25°C –1.5 % Ta=+25 to +85°C –1.5 Error amplifier section Item Symbol Test condition Min. Typ. Max. Unit Input offset voltage VIOF 10 mV Input common mode voltage range VICOM 0.2 1.7 V Open-loop gain AVOL 70 75 dB Unity-gain bandwidth fT 1.2 MHz Output sink current IFBL VFB =1.0V 1.5 2.8 mA Output source current IFBH VFB =0V –0.25 –0.15 mA PWM control section Item Symbol Test condition Min. Typ. Max. Unit Maximum duty cycle D max 100 % Soft-start circuit section 1 (CS1, CS2, CS3/4) Item Symbol Test condition Min. Typ. Max. Unit Input threshold voltage VCSO Duty cycle=0% 0.78 V VCS100 Duty cycle=100% 1.38 V Charge current ICS –7.5 –5.1 –2.5 mA Soft-start circuit section 2 (CS5, CS6) Item Symbol Test condition Min. Typ. Max. Unit Input threshold voltage VCSO Duty cycle=0% 0.79 V VCS100 Duty cycle=100% 1.40 V Charge current ICS 0 mA Regulated voltage section Item Symbol Test condition Min. Typ. Max. Unit Output voltage VREG 2.40 2.67 2.95 V n Electrical characteristics (Ta=25°C, Vcc1=Vcc2=6V, CT=100pF, RT=18kW ) Reference voltage section Item Symbol Test condition Min. Typ. Max. Unit Output voltage VREF 0.985 1.00 1.015 V Line regulation VRLIN VCC =4.5 to 18V 3 10 mV Output voltage variation due to temperature changeVRTa Ta=–20 to +85°C –0.5 %

Overheat protection section Item Symbol Test condition Min. Typ. Max. Unit Operating temperature TOH 125 135 145 °C Hysteresis width DTOH 45 50 55 °C Output section 2 (OUT2, OUT3, OUT4, OUT5, OUT6a ) Item Symbol Test condition Min. Typ. Max. Unit L-level ON resistance R ONL IO =10mA 10 15 W H-level ON resistance R ONH IO =–10mA 10 15 W Rise time tr C LOAD =1000pF 40 60 ns Fall time tf C LOAD =1000pF 55 80 ns Output section 3 (OUT6b ) Item Symbol Test condition Min. Typ. Max. Unit ON resistance R ON6b IO =–10mA 1 2 W Overall device Item Symbol Test condition Min. Typ. Max. Unit Standby current ICCO 31 0 mA Operating-state supply current ICC Duty cycle=0%, R L= ¥ 46m A Short-circuit protection section Item Symbol Test condition Min. Typ. Max. Unit Threshold voltage at CP VCPTH 1.90 2.16 2.42 V Charge current at CP ICP –3.45 –2.30 –1.15 mA Threshold voltage at error amplifier output VFBTL 2.16 V Output section 1 (OUT1) Item Symbol Test condition Min. Typ. Max. Unit L-level ON resistance R ONL IO =10mA 6 10 W H-level ON resistance R ONH IO =–10mA 6 10 W Rise time tr C LOAD =1000pF 30 50 ns Fall time tf C LOAD =1000pF 45 70 ns ON/OFF logic input section Item Symbol Test condition Min. Typ. Max. Unit Input voltage for ON mode VDH 1.0 5.25 V Input voltage for OFF mode VDL 0 0.4 V

n Characteristic curves (Ta = 25°C) Oscillation frequency (fOSC ) vs. Oscillation frequency (f OSC ) vs. timing resistor resistance (RT) ambient temperature (Ta) R T [kΩ ] fosc [kHz] 100 1000 10010 50 680pF 470pF 100pF CT=68pF Output duty cycle vs. CS terminal voltage (VCS ) Output duty cycle vs. FB terminal voltage (V FB ) VCS [V] Output duty cycle [%] 100 Reference voltage (VREF ) vs ambient temperatare (Ta) Supply current (I cc) vs Supply voltage (Vcc) VREF [V] 0.96 0.98 1.02 1.04 1.06 Ta [°C ] 0 20 40 60 80 10020 Ta [°C ] fosc [kHz] 420 440 460 480 500 520 400 0 20 40 60 80 10020 VFB [V] Output duty cycle [%] 100 Vcc [V] Icc [mA] 0 5 10 15 20 Duty cycle=100% Duty cycle=0% Duty cycle=30%

H-level output voltage (VCC-VOH ) vs. L-level output voltage(V OL ) vs. output sink current (ISINK) output source current (ISOURCE ) for OUT1 for OUT1 ISOURCE [mA] 0.2 0.4 0.6 0.8 1.2 1.4 1.6 1.8 2.2 50 100 150 200 VCC– VOH [V] H-level output voltage (VCC-VOH ) vs. L-level output voltage(V OL ) vs. output source current (ISOURCE ) for OUT2, 3, 4, 5, 6a output sink current (ISINK ) for OUT2, 3, 4, 5, 6a ISOURCE [mA] 0.5 1.5 2.5 3.5 50 100 150 2000 VCC– VOH [V] H-level output voltage (VCC-VOH ) vs. Error amplifier voltage gain(Av) / phase( q) vs. frequency(f) output source current (ISOURCE ) for OUT6b Condition: open loop ISOURCE [mA ] 0.2 0.4 0.6 0.8 1.2 1.4 100 200 300 400 500 VCC– VOH [V] 1.8 2.2 0.2 0.4 0.6 0.8 1.2 1.4 1.6 50 100 150 200 ISINK [mA] VOL [V] 3.5 ISINK [mA] 0.5 1.5 2.5 50 100 150 2000 VOL [V] ƒ [HZ] [deg] AV [dB] 100 120 140 160 180 100 1K 10K 100K 1M 10M – 60 – 40 – 20 Av

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.