LT4200

16

Rev. 0

For more information www.analog.com

APPLICATIONS INFORMATION

Figure 7. 12V, 50A Backplane Resident Application with Insertion Activated Turn-On

Additional Applications

The LT4200 has a wide operating range from 2.9V to 15V.

The UV, OV and PG thresholds are set with few resistors.

All other functions are independent of supply voltage.

In addition to hot swap applications, the LT4200 also

functions as a backplane resident switch for removable

load cards (see Figure 7).

Figure 8 shows a 3.3V application with a UV threshold

of 2.87V, an OV threshold of 3.77V and a PG threshold

of 3.05V.

The last page shows a 100A parallel application where

the two LT4200 parts each provide 50A to the load. The

PNPs prevent one LT4200 from faulting off in current limit

until both parts hit the 57A limit. The PNPs are discon-

nected when power good is false via the series MOSFETs

M1 and M2.

TYPICAL APPLICATIONS

R5

150k

R6

20k

ADC

C1

1µF

20k

4200 F07

PG

OUT

FB

UV

GND

IMON

LT4200

OV

TIMER

FLT#

12V

50A

UV = 9.88V

OV = 15.2V

PG = 10.5V

12V

R7

10k

R1

226k

Z1*

R2

20k

12V

R4

20k

R3

140k

LOAD

*TVS Z1: DIODES INC. SMCJ15A

PINS NOT USED IN THIS CIRCUIT:

GATE, ISET

Figure 8. 3.3V, 50A Card Resident Application with Auto-Retry

R5

14.7k

R6

10k

R1

17.4k

ADC

R2

3.16k

C1

1µF

R3

10k

3.3V

20k

4200 F08

1000µF

Z1*

UV

OUT

FB

PG

GND

IMON

LT4200

OV

TIMER

FLT#

+

3.3V

50A

R7

10k

UV = 2.87V

OV = 3.77V

PG = 3.05V

*TVS Z1: DIODES INC. SMCJ15A

PINS NOT USED IN THIS CIRCUIT:

GATE, ISET