FA7622CP Datasheet, PDF (1/8 Pages) Fuji Electric – Bipolar IC For Switching Power Supply Control

FFAA76272C6P(2E) 2CP(E)
Bipolar IC
For Switching Power Supply Control
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.
s Features
• Drive circuit for connecting a power MOSFET
(Io = ±600mA)
• Built-in voltage step-up circuit to drive a power MOSFET
gate: A converter circuit requires only an N-channel power
MOSFET.
• Dual control circuit
• Overcurrent limiting circuit
• Overload cutoff circuit with timer and latch circuit
• ON/OFF control pin
• Wide operating range: 3.6 to 28V
• High-frequency operation: up to 1MHz
• 20-pin package (DIP/SSOP)
s Applications
• Battery power supply for portable equipment
s Dimensions, mm
SSOP-20
20
11
1
10
7.2
0.3
0.65
DIP-20
20
0.6
11
1
24.4
0.77
10
1.52
s Block diagram
REF
20
ON/OFF 19
BIAS
2.54^±0.25
DT1 CT RT VCC1 SW
16 1 2 14
13
OSC
SW
UVLO
12 VCC2
FB1 17
IN1+ ₁₈
VB
CP 3
+
-
ER, AMP1
Duty
limit
OCP
+
-
-
PWM1
Timer
&
latch
IN2+ ₄
IN2- ₅
FB2 ₆
ER, AMP2
+
-
+
-
-
PWM2
Duty
limit
OCP
7
DT2
15 OCL1
11 OUT1
10 OUT2
8 ^OCL2
9
GND
0.46^±0.1
7.62
0~15˚
0.25^{+–00..105}
0~15˚
Pin Pin
No. symbol
Description
1 CT
Oscillator timing capacitor
2 RT
Oscillator timing resistor
3 CP
Timer and latch circuit
4 IN2+
Non-inverting input to error
amplifier
5 IN2-
Inverting input to error amplifier
6 FB2
Error amplifier output
7 DT2
Dead time adjustment
8 OCL2
Overcurrent limiting circuit 2
9 GND
Ground
10 OUT2
CH.2 output
11 OUT1
CH.1 output
12 VCC2
Power supply 2
13 SW
Switch for boost circuit
14 VCC1
Power supply 1
15 OCL1
Overcurrent limiting circuit 1
16 DT1
Dead time adjustment
17 FB1
Error amplifier output
18 IN1+
Non-inverting input to error
amplifier
19 ON/OFF Output ON/OFF control
20 REF
Reference voltage output
1