ltc4253acuf-adj-trpbf Linear Technology Corporation, ltc4253acuf-adj-trpbf Datasheet

ltc4253acuf-adj-trpbf

Manufacturer Part Number

ltc4253acuf-adj-trpbf

Description

?48v Hot Swap Controllers With Sequencer

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC4253ACUF-ADJ-TRPBF.pdf (32 pages)

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FEATURES

TYPICAL APPLICATIO

■

APPLICATIO S

■

Hot Swap is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

– 48V RTN

– 48V A

– 48V B

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

Allows Safe Board Insertion and Removal from a

Live – 48V Backplane

Floating Topology Permits Very High Voltage

Operation

Adjustable Analog Current Limit with Breaker Timer

Ideal for Two Battery Feeds

Fast Response Time Limits Peak Fault Current

Adjustable Undervoltage/Overvoltage Protection

with ±1% Threshold Accuracy (LTC4253A)

Three Sequenced Power Good Outputs

Adjustable Soft-Start Current Limit

Adjustable Timer with Drain Voltage Accelerated

Response

Latchoff After Fault

Available in a 16-Pin SSOP Package

– 48V Distributed Power Systems

Negative Power Supply Control

Central Office Switching

High Availability Servers

Disk Arrays

B3100*

32.4k

402k

10nF

0.33µF

0.1µF

68nF

1µF

RESET

SQTIMER

TIMER

EN2 EN3

LTC4253

– 48V/2.5A Hot Swap Controller

PWRGD1

PWRGD2

PWRGD3

SENSE

DRAIN

GATE

2.5k

15k(1/4W)/6

5.6k

10Ω

18nF

†

IRF530S

0.02Ω

5.6k

†

5.6k

100µF

*DIODES, INC.

†

MOC207

DESCRIPTIO

†

– 48V Hot Swap Controllers

The LTC

controllers allow a board to be safely inserted and removed

from a live backplane. Output current is controlled by three

stages of current-limiting: a timed circuit breaker, active

current limiting and a fast feedforward path that limits peak

current under worst-case catastrophic fault conditions. The

LTC4253/LTC4253A latch off after a circuit fault.

Adjustable undervoltage and overvoltage detectors discon-

nect the load whenever the input supply exceeds the desired

operating range. The LTC4253/LTC4253A’s supply input

is shunt-regulated, allowing safe operation with very high

supply voltages. A multifunction timer delays initial start-

up and controls the circuit breaker’s response time. The cir-

cuit breaker’s response time can be accelerated by sensing

excessive MOSFET drain voltage, keeping the MOSFET

within its safe operating area (SOA). An adjustable soft-start

circuit controls MOSFET inrush current at start-up.

Three power good outputs are sequenced by an adjustable

timer and two ENABLE inputs to enable external power

modules at start-up or disable them if the circuit breaker

trips. The LTC4253A features tight ±1% undervoltage/

overvoltage threshold accuracy. The LTC4253/LTC4253A

are available in a 16-pin SSOP.

LOAD1

4253/LTC4253A negative voltage Hot Swap

LOAD2

4253 TA01

LOAD3

LTC4253/LTC4253A

with Sequencer

SENSE

50mV

GATE

10V

50V

OUT

Start-Up Behavior

1ms/DIV

425353afc

4253 TA01b

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