LTC7003 datasheet(20/24 Pages) LINER

20 / 24 page

LTC7003

7003f

For more information www.linear.com/LTC7003

TYPICAL APPLICATIONS

Protected Redundant Supply Switchover with Shoot Through Protection

Source Side Current Sense

LOAD

10A CONTINUOUS

1µF

BST

VIN

RUN

VIN

RUN

FAULT

VCCUV

IMON

ISET

0.002

2×

BSC057N08NS3G

0.002

2×

BSC057N08NS3G

1nF

10k

SNS+

SNS–

TGDN

TGUP

7003 TA03

LTC7003

VBACKUP

7V TO 60V

MAIN POWER

7V TO 60V

100k

0.1µF

1nF

1µF

200k

6.98k

GND

LTC7003

GND

VCCUV

IMON

ISET

VCC

TIMER

OVLO

VCC

INP

TIMER

OVLO

INP

FAULT

NOTE:

THE BACKUP PATH WILL

LATCH-OFF WITH AN

OVERCURRENT FAULT.

VMAIN Falling Through 33V

VMAIN Rising Through 36V

VLOAD vs Main Power Voltage

VBACKUP = 60V

MAIN POWER (V)

7003 TA03b

VBACKUP = 60V

40µs/DIV

VLOAD

20V/DIV

VTG–TS

BACKUP

10V/DIV

VTG–TS

MAIN

10V/DIV

7003 TA03c

VBACKUP = 60V

2µs/DIV

VLOAD

20V/DIV

VTG–TS

BACKUP

10V/DIV

VTG–TS

MAIN

10V/DIV

7003 TA03d

SI7852ADP

0.1µF

1nF

1µF

0.02

100k

10nF

VIN

3.5V to 60V

LOAD

3.5V to 60V

1A CONTINOUS MAX

VIN

VCC

FAULT

TIMER

INP

SNS+

SNS–

BST

TGUP

TGDN

LTC7003

VCCUV

GND

OFF ON

ISET

IMON

OVLO

RUN

7003 TA02

NOTE:

WITH THE SENSE RESISTOR ON THE

SOURCE SIDE OF THE EXTERNAL MOSFET,

THE LOAD NEEDS TO RISE HIGHER THAN

3.5V WITHIN 140µSEC OF INP GOING

HIGH OR A FAULT WILL BE INDICATED

AND THE LTC7003 WILL RETRY.

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