LTC4222

1

4222f

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Dual Hot Swap Controller

Monitoring

paths to be safely inserted and removed from a live back-

plane. Using external N-channel pass transistors, board

supply voltages and inrush currents are ramped up at an

for monitoring of current, voltage and fault status for

each channel.

The device features adjustable, analog, foldback current

limit circuits and a Soft-Start circuit that sets the dI/dt of

part to latch off or automatically restart after the LTC4222

detects a fault on either channel.

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.

L, LT, LTC and LTM 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. Protected by U.S. Patents including 7330065.

Advanced Mezzanine Card Application

× 5mm) QFN and 36-Pin

SSOP Packages

LTC4222

GATE1

ADR2

ADR1

NC

ADR0

CONFIG

SOURCE1

12V

7.4A

3.3V

150mA

AUXPGOOD

12PGOOD

OV1

OV2

ALERT

SCL

SDA

ON

FB1

ADIN1

TIMER

GPIO1

EN1

SS

10Ω

68nF

6mΩ

Si7336ADP

10.2k

3.57k

10Ω

4222 TA01a

0.1μF

34k

1.02k

3.4k

GND

ALERT

SCL

ON

SDA

12V

ADIN2

FB2

GPIO2

EN2

0.1μF

10Ω

300mΩ

Si1046R

4.99k

3.57k

10Ω

0.1μF

6.55k

1.02k

3.4k

3.3V

PLUG-IN

CARD

BACKPLANE

1μF

10nF

Start-Up Waveform with Sequencing

10V/DIV

10V/DIV

GPIO

PGOOD

10V/DIV

10V/DIV

4222 TA01b

50ms/DIV

CONTACT

BOUNCE