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MA5821

Major Power Technology Co., Ltd.

Rev.1.1

24th, Sep., 2021

58V Asynchronous Buck Controller

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GENERAL DESCRIPTION

The MA5821 is an asynchronous buck controller. The device needs external high side power

MOSFET and low side schottky diode, and provides 3A of continuous load current over a wide

input voltage of 10V to 58V range. Current mode control provides fast transient response and

cycle-bicycle current limit. An internal soft-start function prevents inrush current at turn-on.

This device is available in small MSOP-10L-EP package, and provides a very compact

solution with minimal external components.

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FEATURES

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Wide 10V~ 58V Operating Input Range

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External High-Side P-channel MOSFET Switch

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Output Adjustable : VFB(1.00V±2%)

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Up to 93% Efficiency

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Internal Soft-Start / Thermal Shutdown Protection

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Fixed 240KHz Frequency

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Cycle-by-Cycle Over Current Protection

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Input Under/Over Voltage Lockout

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APPLICATION CIRCUIT

VIN

VDD

SENSE

GND

HGC

LX

FB

COMP

VIN

C5

0.1uF

L1

33μH

R1

40kΩ

R2

10kΩ

C7

0.1μF

OUTPUT

5V 3.0A

C3

R3

0.1μF

C2

0.1μF

MA5821

3.3nF

15kΩ

D1

SS36

C1

100μF

63V

330μF

C8

C7

EN

C6

3.3nF

Q1

PMOS

GND(PAD)

C10

4.7μF

GH

R6 18kΩ

R5 15mΩ

0.1μF

C4

OFF

ON

VOUT＝VFB ×（1＋R1／R2）, VFB = 1.0V, R2 suggest 1K～30KΩ.