LTC4234

1

4234fa

For more information www.linear.com/LTC4234

TYPICAL APPLICATION

FEATURES

DESCRIPTION

20A Guaranteed SOA

Hot Swap Controller

The LTC®4234 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 in a single package for small form factor applica-

tions.TheMOSFETSafeOperatingAreaisproductiontested

and guaranteed for the stresses in Hot Swap applications.

The LTC4234 provides separate inrush current control

and an 11% accurate 22.5A current limit with output

dependent foldback. The current limit threshold can be

include a current monitor output that amplifies the sense

resistor voltage for ground referenced current sensing

and a MOSFET temperature monitor output. Thermal limit,

overvoltage,undervoltageandpowergoodmonitoringare

alsoprovided.Fora10Acompatibleversion,seeLTC4233.

12V, 20A Card Resident Application with Auto-Retry

Power-Up Waveform

APPLICATIONS

n

Allows Safe Board Insertion into Live Backplane

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Small Footprint

n

n

Safe Operating Area Guaranteed at 81W, 30ms

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Wide Operating Voltage Range: 2.9V to 15V

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Adjustable, 11% Accurate Current Limit

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Current and Temperature Monitor Outputs

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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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Pin Compatible with LTC4233

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Available in a 38-Pin (5mm

× 9mm) QFN Package

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High Availability Servers

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Solid State Drives

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Industrial

n

240W, 12V Systems

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

Hot Swap and PowerPath are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

12V

12V

20A

4234 TA01a

1000µF

10k

TIMER

UV

OUT

FB

PG

GND

GATE

LTC4234

OV

SENSE

FLT

+

20k

1µF

*TVS: DIODES INC. SMAJ17A

ADC

107k

*

10k

5.23k

150k

20k

10V/DIV

CONTACT

BOUNCE

10V/DIV

PG

10V/DIV

20ms/DIV

4234 TA01b

0.2A/DIV