LTC4218

1

4218fb

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Hot Swap Controller

to be safely inserted and removed from a live backplane.

An internal high side switch driver controls the gate of an

external N-channel MOSFET for supply voltages from 2.9V

to 26.5V. A dedicated 12V version (LTC4218-12) contains

preset 12V specific thresholds, while the standard LTC4218

allows adjustable thresholds.

The LTC4218 provides an accurate (5%) current limit with

current foldback limiting. The current limit threshold can

be adjusted dynamically using an external pin. Additional

features include a current monitor output that amplifies

the sense voltage for ground referenced current sensing.

Overvoltage, undervoltage and powergood monitoring

are also provided.

12V, 6A Card Resident Application

■

Wide Operating Voltage Range: 2.9V to 26.5V

■

Adjustable, 5% Accurate (15mV) Current Limit

■

Current Monitor Output

■

Adjustable Current Limit Timer Before Fault

■

Powergood and Fault Outputs

■

Adjustable Inrush Current Control

■

2% Accurate Undervoltage and Overvoltage

Protection

■

Available in 16-Lead SSOP and 16-Pin 5mm

× 3mm

DFN Packages

■

RAID Systems

■

ATCA, AMC, μTCA Systems

■

Server I/O Cards

■

Industrial

Power-Up Waveform

ADC

0.1

μF

12V

12V

20k

4218 TA01a

1k

10k

AUTO

RETRY

0.1

μF

0.01

μF

330

μF

GATE

UV

SOURCE

PG

GND

LTC4218DHC-12

TIMER

FLT

10

Ω

2m

Ω

Si7108DN

12V

6A

+

, 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.

25ms/DIV

4218 TA01b

10V/DIV

1A/DIV

10V/DIV

PG

10V/DIV