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FA3621F
s 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.
CMOS IC For Switching Power Supply Control FA3621F
s Dimensions, mm LQFP-48
9.00.3 7.0 1.45 max 0.100.06
25
s 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: 10A(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)
37
36
24
9.00.3
8.0
48
1
12
13
7.0
7.8
0.50.2
0.127
0~7
0.05
0.50.1
0.20.06
s Application
* VTR-camera, digital-steel-camera and portable equipment
1
FA3621F
s Block diagram
CREF
5
VREG
12
2.67V Bias
46 29
VREF
4
Buffer
1V Bias
UVLO Drive bias OHP Over- heat protection Pch driver
41 37
VCC1 VCC2 VDRV
FB1 IN1-
17 16
OUT1 (OPEN)
Error Amp.
15 14
40
FB2 IN2-
48 47
DT1 DT2
Pch driver
43
OUT2
FB3 IN3- IN3+
13 10 11
Pch driver
44
OUT3
FB4 IN4- IN4+
7 9 8
Pch driver
45
OUT4
FB5 IN5- IN5+
18 20 19
Pch driver
Hi
38
OUT5
FB6 IN6-
24 21
Pch driver
23
OUT6b OUT6a
Nch driver
Hi 6
39
CP
TIMER LATCH
OHP UVLO
22 42
GND1 GND2 SYN
36
ON/OFF
35 34 33 28 27
Soft start
32 31 30 25 26
OSC
2 3 1
CNT1 CNT2 CNT3/4 CNT5 CNT6
CS1 CS2 CS3/4 CS5 CS6
CT2
2
CTI RT
FA3621F
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Pin symbol
Description Oscillator timing resistor (Not connect any component) Oscillator timing capacitor Reference voltage output Capacitor for reference voltage output Timing capacitor for timer latch delay Ch. 4 output of error amplifier Ch. 4 non-inverting input to error amplifier Ch. 4 inverting input to error amplifier Ch. 3 inverting input to error amplifier Ch. 3 non-inverting input to error amplifier Regulated voltage output Ch. 3 output of error amplifier Ch. 2 inverting input to error amplifier Ch. 2 output of error amplifier Ch. 1 inverting input to error amplifier Ch. 1 output of error amplifier Ch. 5 output of error amplifier Ch. 5 non-inverting input to error amplifier Ch. 5 inverting input to error amplifier Ch. 6 inverting input to error amplifier Ground ON/OFF switch for ch.6 power supply Ch. 6 output of error amplifier
Pin No. 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
Pin symbol
Description Soft start for Ch. 5 Soft start for Ch. 6 Ch. 6 ON/OFF function Ch. 5 ON/OFF function Power supply for output stage Soft start for Ch. 3 & Ch. 4 Soft start for Ch. 2 Soft start for Ch. 1 Ch. 3 & Ch. 4 ON/OFF function Ch. 2 ON/OFF function Ch. 1 ON/OFF function (Connect to GND1/ GND2 terminal) Bias for logic circuit of outputs Ch. 5 output (for Pch-MOSFET) Ch. 6 output (for Nch-MOSFET) (Not connect any component) Ch. 1 output (for Pch-MOSFET) Ground Ch. 2 output (for Pch-MOSFET) Ch. 3 output (for Pch-MOSFET) Ch. 4 output (for Pch-MOSFET) Power supply for control circuit (Connect to DT1) (Connect to DT2)
RT CT2 CT1 VREF CREF CP FB4 IN4+ IN4- IN3- IN3+ VREG FB3 IN2- FB2 IN1- FB1 FB5 IN5+ IN5- IN6- GND1 OUT6b FB6
CS5 CS6 CNT6 CNT5 VCC2 CS3/4 CS2 CS1 CNT3/4 CNT2 CNT1 SYN VDRV OUT5 OUT6a (OPEN) OUT1 GND2 OUT2 OUT3 OUT4 VCC1 DT2 DT1
s Absolute maximum ratings
Item Power supply voltage Source peak current Sink peak current Output peak current of OUT6b Input voltage for analog input Input voltage for logic input Total power dissipation * Junction temperature Ambient temperature Storage temperature Symbol Rating 20.0 -200 200 -500 -0.3 to +2.8 -0.3 to +5.5 550 125 -20 to +85 -40 to +125 Unit V mA mA mA V V mW C C C
VCC IOUT IOUT IOUT6b VANA VLOG Pd TJ TOP Tstg
* Ta < 25C s Recommended operating conditions
Item Power supply voltage Input voltage for logic input Oscillation frequency Oscillator timing resistor Oscillator timing capacitor CREF terminal by-pass capacitor VREF terminal output current Symbol Min. 4.5 0.0 50 6.8 68 0.01 -60 0 Max. 18.0 5.25 1000 100 1000 Unit V V kHz k pF F A
VCC VLOG fOSC RT CT CREF IREF
3
FA3621F
s Electrical characteristics (Ta=25C, Vcc1=Vcc2=6V, CT=100pF, RT=18k)
Reference voltage section
Item Output voltage Line regulation Output voltage variation due to temperature change Symbol Test condition Min. 0.985 Typ. 1.00 3 0.5 Max. 1.015 10 Unit V mV %
VREF VRLIN VRTa
VCC=4.5 to 18V Ta=-20 to +85C
Regulated voltage section
Item Output voltage Symbol Test condition Min. 2.40 Typ. 2.67 Max. 2.95 Unit V
VREG
Oscillator section
Item Oscillation frequency Frequency variation due to supply voltage change Frequency variation due to temperature change Symbol Test condition Min. 414 Typ. 460 1 1.5 1.5 Max. 506 3 Unit kHz % %
fOSC fdV fdT
RT=18k, CT=100pF VCC=4.5 to 18V Ta=-20 to +25C Ta=+25 to +85C
Error amplifier section
Item Input offset voltage Input common mode voltage range Open-loop gain Unity-gain bandwidth Output sink current Output source current Symbol Test condition Min. Typ. Max. 10 0.2 70 75 1.2 2.8 -0.25 -0.15 1.7 Unit mV V dB MHz mA mA
VIOF VICOM AVOL fT IFBL IFBH
VFB=1.0V VFB=0V
1.5
PWM control section
Item Maximum duty cycle Symbol Test condition Min. Typ. Max. 100 Unit %
Dmax
Soft-start circuit section 1 (CS1, CS2, CS3/4)
Item Input threshold voltage Charge current Symbol Test condition Duty cycle=0% Duty cycle=100% -7.5 Min. Typ. 0.78 1.38 -5.1 -2.5 Max. Unit V V A
VCSO VCS100 ICS
Soft-start circuit section 2 (CS5, CS6)
Item Input threshold voltage Charge current Symbol Test condition Duty cycle=0% Duty cycle=100% Min. Typ. 0.79 1.40 0 Max. Unit V V A
VCSO VCS100 ICS
4
FA3621F
Short-circuit protection section
Item Threshold voltage at CP Charge current at CP Threshold voltage at error amplifier output Symbol Test condition Min. 1.90 -3.45 Typ. 2.16 -2.30 2.16 Max. 2.42 -1.15 Unit V A V
VCPTH ICP VFBTL
Overheat protection section
Item Operating temperature Hysteresis width Symbol Test condition Min. 125 45 Typ. 135 50 Max. 145 55 Unit C C
TOH
TOH
ON/OFF logic input section
Item Input voltage for ON mode Input voltage for OFF mode Symbol Test condition Min. 1.0 0 Typ. Max. 5.25 0.4 Unit V V
VDH VDL
Output section 1 (OUT1)
Item L-level ON resistance H-level ON resistance Rise time Fall time Symbol Test condition Min. Typ. 6 6 30 45 Max. 10 10 50 70 Unit ns ns
RONL RONH
tr tf
IO=10mA IO=-10mA CLOAD=1000pF CLOAD=1000pF
Output section 2 (OUT2, OUT3, OUT4, OUT5, OUT6a )
Item L-level ON resistance H-level ON resistance Rise time Fall time Symbol Test condition Min. Typ. 10 10 40 55 Max. 15 15 60 80 Unit ns ns
RONL RONH
tr tf
IO=10mA IO=-10mA CLOAD=1000pF CLOAD=1000pF
Output section 3 (OUT6b )
Item ON resistance Symbol Test condition Min. Typ. 1 Max. 2 Unit
RON6b
IO=-10mA
Overall device
Item Standby current Operating-state supply current Symbol Test condition Duty cycle=0%, RL= Min. Typ. 3 4 Max. 10 6 Unit A mA
ICCO ICC
5
FA3621F
s Characteristic curves (Ta = 25C)
Oscillation frequency (fOSC) vs. timing resistor resistance (RT)
1000 520
CT =6
Oscillation frequency (fOSC) vs. ambient temperature (Ta)
500
8p F
fosc [kHz]
10
0p
F
100
47 68 0p 0p F
fosc [kHz]
100
480
460
F
440
420 10 10 50
400 20
0
20
40
60
80
100
RT [k]
Ta [C]
Output duty cycle vs. CS terminal voltage (VCS)
100 90 80
Output duty cycle vs. FB terminal voltage (VFB)
100 90 80
Output duty cycle [%]
Output duty cycle [%]
70 60 50 40 30 20 10 0 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5
70 60 50 40 30 20 10 0 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5
VCS [V]
VFB [V]
Reference voltage (VREF) vs ambient temperatare (Ta)
1.06
Supply current (Icc) vs Supply voltage (Vcc)
20 18
1.04
16 14
VREF [V]
Icc [mA]
1.02
12 10 8 6
c Duty
ycle=
30%
1
0.98
4 2
Duty cycle=0% Duty cycle=100%
0.96 20
0 0 20 40 60 80 100
0
5
10
15
20
Ta [C]
Vcc [V]
6
FA3621F
H-level output voltage (VCC-VOH) vs. output source current (ISOURCE) for OUT1
2.2 2 1.8 1.6
L-level output voltage(VOL) vs. output sink current (ISINK) for OUT1
2.2 2 1.8 1.6
VCC- VOH [V]
1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 50 100 150 200
VOL [V]
1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 50 100 150 200
ISOURCE [mA]
ISINK [mA]
H-level output voltage (VCC-VOH) vs. output source current (ISOURCE) for OUT2, 3, 4, 5, 6a
3.5 3
L-level output voltage(VOL) vs. output sink current (ISINK) for OUT2, 3, 4, 5, 6a
3.5 3
2.5
2.5 2
VCC- VOH [V]
1.5
VOL [V]
0 50 100 150 200
2
1.5
1 0.5 0
1 0.5
0
0
50
100
150
200
ISOURCE [mA]
ISINK [mA]
H-level output voltage (VCC-VOH) vs. output source current (ISOURCE) for OUT6b
1.4 1.2 1 0.8 0.6
Error amplifier voltage gain(Av) / phase() vs. frequency(f)
Condition: open loop
180 160 140 120 100
VCC- VOH [V]
AV [dB] [deg]
80 60 40 20
Av
0.4 0.2 0 0 100 200
0 - 20 - 40 - 60 300 400 500 10 100 1K 10K 100K 1M 10M
ISOURCE [mA]
[HZ]
7
FA3621F
s 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.
8

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