Hot Swap Controller

in 6-Lead TSOT Package

Data Sheet

ADM4210

Rev. A

Document Feedback

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

©2006–2013 Analog Devices, Inc. All rights reserved.

Technical Support

www.analog.com

FEATURES

Controls supply rails from 2.7 V to 16.5 V

Allows protected board removal and insertion to a live

backplane

External sense resistor provides adjustable analog current

limit with circuit breaker

Peak fault current limited with fast response

Charge pumped gate drive for external N-FET switch

Automatic retry or latch-off during current fault

Undervoltage lockout

Low profile (1 mm), 6-lead, TSOT package

Pin compatible with LTC4210-1 and LTC4210-2

APPLICATIONS

Hot swap board insertion: line cards, raid systems

Industrial high-side switches/circuit breakers

Electronic circuit breakers

GENERAL DESCRIPTION

The ADM4210 is a hot swap controller that safely enables a

printed circuit board to be removed and inserted to a live

backplane. This is achieved using an external N-channel power

MOSFET with a current control loop that monitors the load

current through a sense resistor. An internal charge pump is

used to enhance the gate of the N-channel FET. When an

overcurrent condition is detected, the gate voltage of the FET is

reduced to limit the current flowing through the sense resistor.

During an overcurrent condition, the TIMER cap determines

the amount of time the FET remains at a current limiting mode

of operation until it is shut down. The ON (ON-CLR) pin is the

enable input for the device and can be used to monitor the

input supply voltage. The ADM4210 operates with a supply

voltage ranging from 2.7 V to 16.5 V.

The ADM4210 is available in two options: the ADM4210-1 with

automatic retry for overcurrent fault and the ADM4210-2 with

latch off for an overcurrent fault. Toggling the ON (ON-CLR)

pin resets a latched fault. The ADM4210 is packaged in a

6-lead TSOT.

FUNCTIONAL BLOCK DIAGRAM

LONG

0.01Ω

0.22µF

GATE

LONG

1.3V

SHORT

SENSE

GATE

DRIVE/

LOGIC

ON

TIMER

ADM4210

GND

GND

GND

20kΩ

100Ω

100Ω

0.01µF

10kΩ

470µF

+

Figure 1.

10ms/DIV

(2V/DIV)

(1V/DIV)

(5V/DIV)

(0.5A/DIV)

Figure 2. Start-Up Sequence