MPQ4473

–HIGH-EFFICIENCY, FAST-TRANSIENT, SYNCHRONOUS, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED

MPQ4473 Rev. 1.01

www.MonolithicPower.com

11

5/24/2016

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2016 MPS. All Rights Reserved.

BLOCK DIAGRAM

Over-Current

Timer

MPQ4473

EN

Reference

VIN

SW

PGOOD

Comparartor

GND

Refresh

Timer

BST

SOFT

Start/Stop

Enable

+

-

SS

0.8V

FB

UV Detect

Comparator

Amplifier

+

-

Current

Sense

LS

Driver

HS

Driver

Current

Modulator

LOGIC

BSTREG

xS

xR

Q

UV

ON

Timer

OFF

Timer

5V

LDO

SS

FB

PG

0.4V

0.8V

1.0V

LOOP

Comparartor

+

OC

PWM

VCC

RSEN

AGND

FREQ

1MEG

HS ILIM

Comparator

ILIM

R3

Vcc

Over-Current

Timer

MPQ4473

EN

Reference

VIN

SW

PGOOD

Comparartor

GND

Refresh

Timer

BST

SOFT

Start/Stop

Enable

+

-

SS

0.8V

FB

UV Detect

Comparator

Amplifier

+

-

Current

Sense

LS

Driver

HS

Driver

Current

Modulator

LOGIC

BSTREG

xS

xR

Q

UV

ON

Timer

OFF

Timer

5V

LDO

SS

FB

PG

0.4V

0.8V

1.0V

LOOP

Comparartor

+

OC

PWM

VCC

RSEN

AGND

FREQ

1MEG

HS ILIM

Comparator

ILIM

R3

Vcc

Figure 1: Functional Block Diagram