AS1003 350KHz, 23V/3A Step-down Converter FEATURES
GENERAL DESCRIPTION The AS1003 is a buck topology of switching regulator for wide operating voltage field.
Input Voltage Range: 3V to 23V Feedback Voltage: 0.5V ± 2% Low Quiescent Current: 5mA(Typ.) Fixed Operating Frequency: 350KHz(Typ.) Output Current: 3A Programmable Soft Start Function Short Circuit Protection Auto Restart Function Short Circuit Protection Internal Built-in P-MOSFET Package: SOP-8L
The AS1003 includes a high current P-MOSFET, high precision reference (0.5V) for comparing output voltage with feedback amplifier, an internal dead time control and oscillator for controlling the maximum duty cycle and PWM frequency, and has power on programmable soft start time and short circuit P-MOSFET turn off and auto restart protections. The AS1003 is available in a low profile SOP-8L package.
APPLICATIONS
Distributed Power System Pre-regulator for Linear regulator Monitor/TV Battery Charger
TYPICAL APPLICATION CIRCUIT
SK34 1
IN
SW
22uH
7,8
AS1003
470uF 25V
FB 2
SCP/SS
GND
COMP
56K 1%
3
10K 1%
4
5, 6 0.1uF
0.1uF
100 Vout
95
3.3V
90
470uF 16V
Efficiency (%)
Vin
Efficiency vs Load Current VOUT=5V
85 80
VOUT=3.3V
75 70 65
VIN=12V L=22uH
60 55 50 0
0.5
1
1.5
2
2.5
3
Load Current (A)
AS1003 Rev2.4 05/05/2015
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