FB

SW

RTN

ON TIMER

DRIVER

BST

LEVEL

SHIFT

SD/

2.5V

THERMAL

SHUTDOWN

0.725A

BUCK

SWITCH

CURRENT

SENSE

COMPLETE

START

COMPLETE

START

Ron

100 PH

L1

C2

15 PF

R3

3.01k

R4

1k

R2

100k

200k

C4

0.01 PF

C3

0.1 PF

12V -42V

10V

LM25007

UVLO

FB

R5

1

UVLO

REGULATION

COMPARATOR

OVER-VOLTAGE

COMPARATOR

2.875V

SD

SD

COMPLETE

START

MINIMUM OFF

TIMER

C1

1 PF

8

6

5

3

4

1

2

7

7V SERIES

REGULATOR

CURRENT LIMIT

OFF TIMER

SHUTDOWN

C5

0.1 PF,

100V

D1

Q

CLR

Q

SET

S

R

+

-

+

-

+

-

LM25007

www.ti.com

SNVS401B – JANUARY 2006 – REVISED FEBRUARY 2008

Typical Application Circuit and 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.

Absolute Maximum Ratings

(1)

VIN to RTN

45V

BST to RTN

59V

SW to RTN (Steady State)

-1V

Human Body Model

2kV

45V

BST to SW

14V

VCC to RTN

14V

All Other Inputs to RTN

-0.3 to 7V

Storage Temperature Range

-65°C to +150°C

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.

(2)

The human body model is a 100pF capacitor discharge through a 1.5k

Ω resistor into each pin. The human body ESD compliance level

for Pin 7 and 8 is 1000V.

Operating Ratings

(1)

9V to 42V

Junction Temperature

−40°C to + 125°C

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Copyright © 2006–2008, Texas Instruments Incorporated

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