CALLM FA3621F Datasheet
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
112
36 25
48 37
13 24
9.0
±0.3
0.5
±0.2
7.0
7.8
8.0
FA3621F
CMOS IC
For Switching Power Supply Control
FA3621F
■ 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.
■ 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: 10µA(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)
■ Application
• VTR-camera, digital-steel-camera and portable equipment
■ Dimensions, mm
Á LQFP-48
1
FA3621F
■ Block diagram
VREF
FB1
IN1–
FB2
IN2–
FB3
IN3–
IN3+
FB4
IN4–
IN4+
FB5
IN5–
IN5+
4
17
16
15
14
13
10
11
7
9
8
18
20
19
Buffer
Error Amp.
CREF
VREG
5
1V
Bias
12
2.67V
Bias
UVLO
OHP
Over- heat protection
Drive
bias
Pch
driver
Pch
driver
Pch
driver
Pch
driver
Pch
driver
Hi
46
29
37
41
40
48
47
43
44
45
38
VCC1
VCC2
VDRV
OUT1
(OPEN)
DT1
DT2
OUT2
OUT3
OUT4
OUT5
FB6
IN6–
CP
24
21
Hi
6
TIMER
LATCH
OHP
ON/OFF
35 34
33
CNT1
CNT2
28
27
CNT3/4
CNT5
UVLO
CNT6
Soft start
32 31 30
CS1
CS2
CS3/4
25 26
CS5
CS6
Pch
driver
Nch
driver
OSC
23
CTI
CT2
1
RT
23
OUT6b
39
OUT6a
22
GND1
42
GND2
36
SYN
2
FA3621F
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
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)
■ 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
■ 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 RT 6.8 100 kΩ
Oscillator timing capacitor CT 68 1000 pF
CREF terminal by-pass capacitor CREF 0.01 µF
VREF terminal output current IREF –60 0 µA
3
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