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MA5003

Major Power Technology Co., Ltd.

Rev.1.3

Dec.01, 2016



APPLICATION CIRCUIT

OFF ON

2A

GND

FB

SW

EN

10

μF

VCC

L1

R1

R2

10

μF

x2

Vout=0.6x(1+R1/R2)

22P

2.2~4.7

μH

option

option

C1

C2

CFB

Ω

OFF ON

2A

GND

FB

SW

EN

10

μF

VCC

L1

R1

R2

22

μF

Vout=0.6x(1+R1/R2)

2.2

μH

option

C1

C3

22

μF

C2

Layout Guide

EN

GND

SW

FB

VCC

C1

L1

VOUT

R1

R2

SW should be connected to Inductor

by wide and short trace, keep

sensitive components away from this

trace

C2

MA5003

12

3

4

5

C1's ground must be as closer

to IC's GND pin as possible

REN

C2's ground must be as

closer to IC's GND pin as

possible

CFB

VCC

GND

GND



FUNCTION DESCRIPTION

Normal Operation

The MA5003 uses a user adjustable frequency, current mode, synchronous step-down

architecture with internal paver switch. During normal operation, the internal power switch is

turned on each cycle when the oscillator sets the SR latch, and turned off when the

comparator resets the SR latch. The peak inductor current at which comparator resets the

SR latch is controlled by the output of error amplifier EA. While the high-side switch is off,

the external schottky diode turns on until either the inductor current starts to reverse or the

beginning of the next switching cycle.