MP8725 – 5A, 21V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS

MP8725 Rev. 1.0

www.MonolithicPower.com

8

9/21/2011

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BLOCK DIAGRAM

Reference

Oscillator

VCC

Regulator

-

+

-

+

HS

Driver

FB

EN/SYNC

IN

Current Sense

Amplifer

Current Limit

Comparator

Error Amplifier

SW

BST

GND

LS

Driver

VCC

+

BOOST

Regulator

Comparator

On Time Control

Logic Control

400K

1MEG

50pF

RSEN

1pF

VCC

PG

PG

Comparator

Figure 1—Function Block Diagram