As1003

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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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