FA7622CP(E)
FA7622CP(E)
s
Description
The FA7622CP(E) is a DC-DC converter IC that can directly
drive a power MOSFET. This IC has all the necessary
protection functions for a power MOSFET. It is optimum for a
portable equipment power supply which uses low-voltage input
to output comparably large power.
Bipolar IC
For Switching Power Supply Control
s
Dimensions, mm
SSOP-20
20
11
鈥?Drive circuit for connecting a power MOSFET
(Io =
卤600mA)
鈥?Built-in voltage step-up circuit to drive a power MOSFET
gate: A converter circuit requires only an N-channel power
MOSFET.
鈥?Dual control circuit
鈥?Overcurrent limiting circuit
鈥?Overload cutoff circuit with timer and latch circuit
鈥?ON/OFF control pin
鈥?Wide operating range: 3.6 to 28V
鈥?High-frequency operation: up to 1MHz
鈥?20-pin package (DIP/SSOP)
0.1
卤0.1
+0.1
7.2
0.2
鈥?.05
1
10
5.3
s
Features
7.9
卤0.3
0~10藲
0.6
0.3
0.65
DIP-20
20
11
s
Applications
鈥?Battery power supply for portable equipment
1
0.77
24.4
10
1.52
2.54min 5.1max
3.6
0.51min
6.4
2.1max
鈥?
0.25
+0.1 5
.0
7.62
藲
5藲
0~1
2.54
卤0.25
0.46
卤0.1
0~15
s
Block diagram
REF
20
DT1
16
CT
1
RT VCC1
2
14
SW
13
SW
ON/OFF 19
BIAS
OSC
UVLO
12
VCC2
Pin
No.
1
2
3
4
5
FB1 17
IN1+ 18
VB
CP
IN2+
IN2-
FB2
3
ER, AMP2
+
-
+
-
ER, AMP1
Duty
limit
+
-
-
OCP
15
OCL1
6
7
11
PWM1
OUT1
8
9
10
11
12
+
-
-
10
PWM2
OCP
9
GND
8
OCL2
OUT2
13
14
15
16
17
18
19
20
Pin
symbol
Description
Oscillator timing capacitor
Oscillator timing resistor
Timer and latch circuit
Non-inverting input to error
amplifier
Inverting input to error amplifier
Error amplifier output
Dead time adjustment
Overcurrent limiting circuit 2
Ground
CH.2 output
CH.1 output
Power supply 2
Switch for boost circuit
Power supply 1
Overcurrent limiting circuit 1
Dead time adjustment
Error amplifier output
Non-inverting input to error
amplifier
Output ON/OFF control
Reference voltage output
CT
RT
CP
IN2+
IN2-
FB2
DT2
OCL2
GND
OUT2
OUT1
VCC2
SW
VCC1
OCL1
DT1
FB1
IN1+
ON/OFF
REF
Timer
&
latch
4
5
6
Duty
limit
7
DT2
1
1
2
3
4
5
6
7
8
