Document
FA7700V, FA7701V
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.
CMOS IC For Switching Power Supply Control FA7700V, FA7701V
s Dimensions, mm TSSOP-8
4.4 ±0.2
6.4 ±0.3
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
0.575 typ
1.30 max
3.1
±0.3
0.1 ±0.05
10 to 0 ˚
0.65 0.22
±0.1
0.5
±0.2
s Block diagram FA7700V FA7701V
RT
1
VREF
UVLO
8
0.3V ON/OFF
0.15 ±0.1
CS
RT
1
VREF
UVLO
8
0.3V ON/OFF
CS
REF
2 3 4
VREF 2.2V
– +
OSC
5.5V 1.5V
S.C.P
BIAS 1.5V Power Good Signal
S.C.DET
+ –
2.2V
7 6 5
VCC
REF
2 3 4
VREF 2.2V
– +
OSC
S.C.P 1.5V S.C.DET 1.5V
BIAS Power Good Signal
+ –
2.2V 5.5V
7 6 5
VCC
IN–
+ –
ON/OFF
OFF
0.88V
+ –
ER.AMP
+ – + +
OUT
IN–
+ –
ON/OFF
OFF
0.88V
+ –
+ – +
OUT
PWM
PWM
ER.AMP
FB
GND
FB
GND
Pin No. Pin symbol Description 1 2 3 4 5 6 7 8 RT REF IN (–) FB GND OUT VCC CS Oscillator timing resistor Internal bias voltage Error amplifier inverting input Error amplifier output Ground Output for driving switching device Power supply ON/OFF, soft start, timer latched short circuit protection
1
FA7700V, FA7701V
s Absolute maximum ratings
Item
Power supply voltage REF terminal output current OUT terminal source current OUT terminal sink current RT, REF, IN–, FB terminal voltage CS terminal voltage CS terminal sink current Power dissipation Operating ambient temperature Operating junction temperature Storage temperature Symbol Vcc IREF ISO peak ISO cont ISI peak ISI cont VRT, VREF VIN–, VFB VCS ICS Pd Ta Tj Tstg Rating 20 2 –400 (peak) –50 (continuos) +150 (peak) +50 (continuos) +2.5 (max.) –0.3 (min.) Self limitingԼ5.5 (max.) –0.3 (min.) 200 250 (TaϹ25˚C) –30 to +85 +125 –40 to +150 Unit V mA mA mA V V µA mW ˚C ˚C ˚C
Maximum power dissipation curve
300
M.