LTC4215

1

4215fb

Hot Swap Controller with

■

Live Board Insertion

■

Electronic Circuit Breakers

■

Computers, Servers

■

Platform Management

■

Allows Safe Insertion into Live Backplane

■

8-Bit ADC Monitors Current and Voltage

■

■

Wide Operating Voltage Range: 2.9V to 15V

■

dI/dt Controlled Soft-Start

■

High Side Drive for External N-Channel MOSFET

■

No External Gate Capacitor Required

■

Input Overvoltage/Undervoltage Protection

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Optional Latchoff or Auto-Retry After Faults

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Alerts Host After Faults

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Inrush Current Limit with Foldback

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Available in 24-Lead (4mm

x 5mm) QFN and

16-Lead Narrow SSOP Packages

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

+

+

LTC4215UFD

GATE

TIMER SS

ON

GND

SOURCE

OV

SDAO

SDAI

SCL

ALERT

FB

EN

ADIN

GPIO

2.67k

PLUG-IN

CARD

1.74k

20V

10

Ω

0.005

Ω

FDC653N

30.1k

12V

3.57k

24k

4215 TA01a

0.1

µF

0.1

µF

34k

BACKPLANE

68nF

GND

ALERT

SCL

SDA

12V

safely inserted and removed from a live backplane. Using

an external N-channel pass transistor, board supply voltage

and inrush current are ramped up at an adjustable rate.

of load current, voltage and fault status.

The device features adjustable foldback current limit and

a soft-start pin that sets the dI/dt of the inrush current.

automatically restart after the LTC4215 detects a current

limit fault.

The controller has additional features to interrupt the host

when a fault has occurred, notify when output power is

good, detect insertion of a load card, and power-up either

to turn on.

4215 TA01b

50ms/DIV

10V/DIV

10V/DIV

(POWERGOOD)

10V/DIV

INRUSH

CURRENT

2.5A/DIV

CONTACT

BOUNCE

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

Hot Swap is a registered trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.