CALLM FA3635P Datasheet
FA3635P
FA3635P
CMOS IC
For Switching Power Supply Control
■ Description
FA3635P is a CMOS IC which includes low on-resistance
power MOSFET for PWM-type switching power supply control.
This IC achieves high efficiency DC-DC converter and it is
suitable for buck converter or inverting converter with high
input voltage of 10V to 50V.
■ Features
• Built-in low on-resistance Pch power MOSFET
50V/1.1Ω(typ.)/1A(peak)
• Wide range of 10V to 50V for input voltage
• 1.2mA low operating current as a Power IC
• Latch-mode short-circuit protection function
• Built-in over-temperature protection
Tj =125°C (min.)
■ Applications
• Power supply for general equipment
■ Block diagram
■ Dimensions, mm
Á DIP-8
8
1
2.54
±0.25
9.4
1.5
0.5
5
4
±0.1
6.5
3.4
4.5max
3.1min
0~15˚
7.6
0.25
0~15˚
+0.1
–0.05
Pin Pin Description
No. symbol
1 VCC Power supply
2 FB Error amplifier output
3 IN Inverting input to error amplifier
4 GND Ground
5 GND Ground
6 REF Reference voltage
7 CS Capacitor for soft-start
8 OUT Output
1
FA3635P
■ Absolute maximum ratings
Item Symbol Rating Unit
Supply voltage
Error amplifier input voltage
Total Power dissipation
(Ta = 25°C)
Junction temperature
Operating temperature Top –20 to +85°C °C
Storage temperature Tstg –40 to +150 °C
VCC 50.0 V
VIN 5.5 V
Pd 1.1 W
Tj 125 °C
■ Recommended operating conditions
Item Symbol Min. Max. Unit
Supply voltage VCC 10.0 45.0 V
REF terminal by-pass capacitor
VCC terminal by-pass capacitor
CREF
0.047
0.22 µF
CO 470 µF
■ Electrical characteristics (Ta=25°C, VCC=44V, CREF=0.1µF)
Reference voltage section
Item Symbol Test condition Min. Typ. Max. Unit
terminal Voltage VREG CREF=0.1µF 3.00 3.12 3.24 V
Oscillator section
Item Symbol Test condition Min. Typ. Max. Unit
Oscillation frequency fOSC 70 81 100 kHz
Frequency change with supply voltage fdV VCC=10 to 45V ±1 ±3%
Frequency change with temperature fdT Ta=–20 to +85°C ±3 ±5%
Error amplifier section
Item Symbol Test condition Min. Typ. Max. Unit
Input common mode voltage range VICOM 0.2 2.5 V
Open-loop gain AVOL 55 dB
Unity-gain bandwidth fT 1.0 MHz
Output sink current IFBL Voltage follower 3.0 3.8 mA
VFB=Vref+0.05V
Output source current IFBH Voltage follower –140 –100 µA
VFB=Vref–0.05V
Reference Voltage Vref Voltage follower 0.97 1.00 1.03 V
VCC=10 to 45V
Ta=–20 to +85°C
Input threshold voltage (Pin 2) VFB 0 Duty cycle=0% 0.5 0.6 0.7 V
VFB 100 Duty cycle=100% 2.3 2.5 2.7 V
Soft-start circuit section
Item Symbol Test condition Min. Typ. Max. Unit
Input threshold voltage (Pin 7) VCS 0 Duty cycle=0% 0.5 0.6 0.7 V
VCS 100 Duty cycle=100% 2.3 2.5 2.7 V
Charge current ICS –2.8 –2.2 –1.6 µA
Undervoltage lockout circuit section
Item Symbol Test condition Min. Typ. Max. Unit
Operating voltage VUVLO 5.0 6.1 8.5 V
2
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