FA7700V, FA7701V
CMOS IC
For Switching Power Supply Control
FA7700V, FA7701V
s Description
s Dimensions, mm
6.4 ±0.3
1.30 max
10 to 0
˚
4.4 ±0.2
TSSOP-8
0.1 ±0.05
FA7700V/FA7701V are the PWM type DC to DC converter
control ICs with 1ch output that can directly drive power
MOSFETs. CMOS devices with high breakdown voltage are
used in these ICs and low power consumption is achieved.
These ICs have not only the functions equivalent to those of
FA76XX series but also the functions of directly driving Nch/Pch
MOSFETs, lower power consumption, higher frequency
operation, and less external components.
0.575 typ
3.1
• Wide range of supply voltage: VCC=2.5 to 20V
• FA7700V: For boost, flyback converter
(Maximum output duty cycle is 80%)
• FA7701V: For buck converter
(Maximum output duty cycle is 100%)
• Output stage consist of CMOS push-pull circuit, and achieves
a high speed switching of external MOSFETs. (FA7700V: For
Nch-MOSFET driving, FA7701V: For Pch-MOSFET driving)
• High accuracy reference voltage (Error amplifier): 0.88V±2%
• Soft start function
• Adjustable built-in timer latch for short-circuit protection
• Output ON/OFF control function
• Less external discrete components needed (2 components
less than conventional version of the equivalent products)
• Low power consumption
Stand-by current: 40µA typ.
Operating current: 1.2mA typ. (Including error amplifier output
current and oscillator current)
• High frequency operation: 50kHz to 1MHz
• Package: TSSOP-8, thin and small
±0.3
0.15 ±0.1
s Features
0.65
0.22
0.5
±0.1
±0.2
s Block diagram
FA7701V
FA7700V
RT
1
8
UVLO
VREF
REF
2
0.3V
5.5V
OSC
1.5V
S.C.DET
1.5V
+
–
Power Good Signal
3
1
S.C.P
+
–
7
VCC
REF
2
0.3V
OSC
1.5V
+
–
Power Good Signal
OUT
IN–
3
+
+
–
+
ON/OFF
+
–
VCC
2.2V
OFF
6
OUT
5
GND
5.5V
PWM
ER.AMP
5
4
0.88V
–
PWM
7
S.C.P
1.5V
S.C.DET
BIAS
6
CS
ON/OFF
–
+
VREF
2.2V
2.2V
OFF
+
–
+
+
ER.AMP
8
UVLO
VREF
ON/OFF
ON/OFF
0.88V
+
–
FB
RT
–
+
VREF
2.2V
BIAS
IN–
CS
GND
FB
4
Pin No. Pin symbol Description
1
RT
Oscillator timing resistor
2
REF
Internal bias voltage
3
IN (–)
Error amplifier inverting input
4
FB
Error amplifier output
5
GND
Ground
6
OUT
Output for driving switching device
7
VCC
Power supply
8
CS
ON/OFF, soft start, timer latched short
circuit protection
1
