LTC4216

4216f

1

■

Allows Safe Board Insertion and Removal from

a Live Backplane

■

Controls Load Voltages from 0V to 6V

■

Fast Response Limits Peak Fault Current

■

Adjustable Analog Current Limit

■

Adjustable Soft-Start with Inrush Current Limiting

■

Adjustable Response Time for Overcurrent

Protection

■

Low Circuit Breaker Trip Threshold: 25mV

■

No External Gate Capacitor Required

■

Gate Drive for External N-Channel MOSFET

■

Adjustable Supply Voltage Power-Up Rate

■

⎯R⎯E⎯S⎯E⎯T and ⎯F⎯A⎯U⎯L⎯T Output

■

10-Lead MSOP and 12-Lead (4mm × 3mm) DFN

Packages

Ultralow Voltage

Hot Swap Controller

The LTC

controller that allows a board to be safely inserted and

removed from a live backplane. It controls load voltages

ranging from 0V to 6V and isolates a severe fault with

instantaneous analog current limiting.

An internal high side switch driver controls the gate of

an external N-channel MOSFET. An adjustable soft-start

limits the rate of change of the inrush current at start-up

for a large load capacitor. Together with an analog current

limit amplifier, an electronic circuit breaker with adjustable

response time provides dual level overcurrent protection.

No external gate capacitor is required for the analog cur-

rent limit loop compensation.

The FB pin monitors the output supply voltage and signals

the ⎯R⎯E⎯S⎯E⎯T output pin. An ON pin provides on/off control

and a ⎯F⎯A⎯U⎯L⎯T pin indicates the fault status. The LTC4216

is available in the 10-lead MSOP and 12-lead (4mm ×

3mm) DFN packages.

Single Channel 1.8V Hot Swap Controller

■

Electronic Circuit Breaker

■

Live Board Insertion and Removal

■

Industrial High Side Switch/Circuit Breaker

■

Optical Networking

Normal Power-Up

with Soft-Start

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

4216 TA01b

0.5ms/DIV

5V/DIV

2.5A/DIV

1V/DIV

SENSEP SENSEN GATE

ON

TIMER

FB

FAULT

RESET

SS

FILTER

LTC4216

330nF

20k

1%

17.4k

1%

10k

10k

1%

15k

1%

LONG

BACKPLANE

CONNECTOR

(FEMALE)

PCB EDGE

CONNECTOR

(MALE)

GND

LONG

SHORT

10nF

10nF

18nF

1.8V

5A

1.8V

3.3V

GND

Si4864DY

0.004

Ω

22

Ω

3.3V

10k

+

1000

µF

FAULT

RESET

µP

LOGIC

4216 TA01

LONG

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

Hot Swap is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.