+

-

PWM

V

BG

V

DD

Driver

+

-

+

-

Vamp

BIAS, SHUTDOWN,

and

PROTECTION

CIRCUITRY

Shutdown

control

V IH

V IL

flagout

L1

D2

C2

R2

R3

R5

C3

CinA

RinA

Rf1

Cf1

Rf2

Cf2

Cs2

Ro1

Ro2

Cb1

SW

SW-LEAK

FB

GND(SW)

GND

BW1

BW2

VIN

Cchg

SD Amp

SD Boost

GND

Vo1

Vo2

Rs

LM4962

OC/OV Detect

Cs1

VDD

Css

Rchg1

Bypass

Soft-Start

Flagout

Shutdown

control

V IH

V IL

LM4962

SNAS300C – DECEMBER 2005 – REVISED MARCH 2006

www.ti.com

Block Diagram

Figure 4. LM4962 Block Diagram

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

4

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