LT4200

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

50A Hot Swap E-Fuse with

Guaranteed SOA

The LT®4200 is an integrated solution for hot swap

applications that allows a board to be safely inserted and

removed from a live backplane. The part integrates a hot

swap controller, power MOSFET and current sense resistor

into a single package for small form-factor applications.

The MOSFET safe operating area is production tested and

guaranteed for the stresses in hot swap applications.

The LT4200 allows 50A of continuous operation at up to

85°C ambient temperature. It provides separate inrush

current control and a ±12% accurate 57A current limit with

output dependent foldback. The current limit threshold

can be adjusted dynamically using the ISET pin. Additional

features include a current monitor output for ground

referenced current sensing and a MOSFET temperature

monitor output. Thermal limit, overvoltage, undervoltage

and power good monitoring are also provided.

12V, 50A Card Resident Application with Auto-Retry

Power-Up Waveform

APPLICATIONS

n

Allows Safe Board Insertion into Live Backplane

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Wide Operating Voltage Range: 2.9V to 15V

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Guaranteed Safe Operating Area: 7.5W√s

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1.2mΩ MOSFET with Current Sense Element

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±4% Current Monitor Output

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Adjustable Current Limit Threshold

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Temperature Monitor Output

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Overtemperature Protection

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Adjustable Current Limit Timer Before Fault

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Power Good and Fault Outputs

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Adjustable Inrush Current Control

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±2.5% Accurate Undervoltage and

Overvoltage Protection

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Available in a 36-Pin (5mm × 8mm) QFN Package

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High Availability Servers

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Solid State Drives

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12V

12V

50A

4200 TA01a

4700µF

10k

TIMER

UV

OUT

FB

PG

GND

IMON

LT4200

OV

FLT#

+

20k

1µF

*TVS: DIODES INC. SMCJ15A

ADC

107k

*

10k

5.23k

150k

20k

PINS NOT USED IN THIS CIRCUIT:

GATE, ISET

10V/DIV

CONTACT

BOUNCE

10V/DIV

PG

10V/DIV

20ms/DIV

4200 TA01b

2A/DIV