FA7700V Datasheet, PDF (1/13 Pages) List of Unclassifed Manufacturers – For Switching Power Supply Control

FA7700V, FA7701V
CMOS IC
For Switching PFoAw7e7r0S0uVp,pFlyAC7o7n0tr1oVl
s Description
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.
s Features
• 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
s Dimensions, mm
TSSOP-8
0.575 typ
3.1^±0.3
0.65
0.22 ^±0.1
0.5 ^±0.2
s Block diagram
FA7700V
FA7701V
RT ₁
REF ₂
IN– ₃
FB ₄
VREF
UVLO
0.3V
VREF
2.2V
OSC
BIAS
Power Good Signal
0.88V
+
–
ER.AMP
5.5V
1.5V
S.C.DET
1.5V
+
–
OFF
ON/OFF
+
–
+
+
PWM
ON/OFF
–
+
S.C.P
+
–
2.2V
8 CS
7 ^VCC
6 OUT
5 ^GND
RT ₁
REF ₂
IN– ₃
FB ₄
UVLO
8 CS
VREF
0.3V ON/OFF
VREF
2.2V
OSC
BIAS
Power Good Signal
0.88V
+
–
ER.AMP
1.5V
S.C.DET
1.5V
+
– _OFF
ON/OFF
+
–
+
PWM
–
+
S.C.P
+
7 ^VCC
–
2.2V
5.5V
6 OUT
5 ^GND
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