MP4575

– 5A, 55V, SYNCHRONOUS, STEP-DOWN CONVERTER

MP4575 Rev. 1.0

www.MonolithicPower.com

13

8/16/2016

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BLOCK DIAGRAM

ISW

1V

SS_Internal

SS_Internal

SS

400mV

PLL

CLK

FB Fsw Foldback

FREQ Setting

PLL Fsw Setting

PLL ON

COMP Fsw Foldback

110%REF

90%REF

FB

OC

ZC

CLK

ZC

SW LOW

RB

CPB

LS

DMOS

Q

HS

DMOS

HS Current

Limit COMP

SW

VIN

BST

CLK

LS DRVL LOW

NO OC

PGND

PG

FB

COMP

FREQ

Internal

Regulator

(2.5V)

VDD

Regulator

(3.6V or 4.8V)

Voltage

Reference

Current

Reference

Thermal

Shutdown

VIN UVLO

BIAS

2V

CLK

VDD

ISW

EN

Figure 1: Functional Block Diagram