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Undervoltage

Lockout

Bias Supply

_

+

+

–

REF

Current Limit Comparator

+

–

REF

P-Channel

Power MOSFET

N-Channel

Power MOSFET

Driver

Shoot-Through

Logic

+

–

Load Comparator

Control

Logic

+

–

1.21 V

Soft Start

850 kHz

Oscillator

+

–

S

R

Comparator High

Comparator Low

Comparator High2

+

–

Compensation

R2

See Note

R1

Comparator Low

Comparator Low2

Comparator High

Saw Tooth

Generator

V

I

Comparator

SW

PG

LBO

GND

PGND

LBI

FB

EN

SKIP Comparator

Error Amp

SYNC

TPS62050, TPS62051

TPS62052, TPS62054, TPS62056

SLVS432D – SEPTEMBER 2002 – REVISED OCTOBER 2003

FUNCTIONAL BLOCK DIAGRAM

NOTE: For the adjustable versions (TPS62050, TPS62051), the internal feedback driver is disabled and the FB pin is

directly connected to the GM amplifier.

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