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MA5805

Major Power Technology Co., Ltd.

Rev.1.0

19

th, Jun., 2020

58V Asynchronous Buck Converter for POE



GENERAL DESCRIPTION

The MA5805 is a monolithic asynchronous buck regulator. The device integrates 110mΩ

MOSFET, and provides 2A of continuous load current over a wide input voltage of 10V to 58V.

Current mode control provides fast transient response and cycle-bicycle current limit.

The internal soft-start function prevents inrush current at turn-on, This device, available in an

SOP8L-EP(Exposed pad) package, provides a very compact solution with minimal external

components.



FEATURES

-

Wide 10V to 58V Operating Input Range

-

3.3V / 5V Output Voltage (for POE)

-

Integrated 110mΩ P-channel MOSFET Switches

-

Output Adjustable :VFB(1.00V±2%)

-

Internal Soft-Start

-

Fixed 500KHz Frequency

-

Cycle-by-Cycle Over Current Protection

-

Input Under/Over Voltage Lockout



APPLICATION CIRCUIT

VIN

EN

VDD

GND

HGC

SW

FB

COMP

INPUT

10V~58V

C5

0.1uF

L1

10 uH

R1

18kΩ

R2

10kΩ

CFF 3.3nF

OUTPUT

3.3 V2.0A

C3

R3

C6

0.1uF

C1

4.7uF

MA5805

3.3nF

1kΩ

PAD

D1

SS310

C2

100uF

63V

330uF

C7

C4

0.1uF

Option

ON

R4

C8

22uF

23kΩ

OFF

VOUT=VFB × (1+R1/R2), VFB = 1.00V, R2 suggest 1k~20kΩ