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ADM1170-1AUJZ-RL7

1.6 V to 16.5 V Hot Swap Controller with Soft Start

Analog Devices 

Data Sheet

1.6 V to 16.5 V Hot Swap Controller

with Soft Start

ADM1170

FEATURES

Controls supply rails from 1.6 V to 16.5 V

Supply voltage range 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

Soft start controls inrush current profile

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

8-lead, TSOT package

APPLICATIONS

Hot swap board insertion: line cards, raid systems

Industrial high-side switches/circuit breakers

Electronic circuit breakers

GENERAL DESCRIPTION

The ADM1170 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.

The ADM1170 operates with a supply voltage ranging from

2.7 V to 16.5 V. By using independent SENSE pins from VCC,

the ADM1170 allows for the hot swap of supplies ranging down

to 1.6 V. During an overcurrent condition, the TIMER pin

capacitor 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 ADM1170 also

features soft start to provide the user with a capacitor program-

mable ramping reference to the internal current sense comparator.

This provides a linearly increasing current limit at startup at a

rate set by CSS. This helps to reduce and limit large inrush

currents.

This device is available in two options: the ADM1170-1 with

automatic retry for overcurrent fault and the ADM1170-2 with

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

pin resets a latched fault. The ADM1170 is packaged in an

8-lead TSOT.

VIN = 1.8V

VIN = 3.3VAUX

GND

FUNCTIONAL BLOCK DIAGRAM

LONG

RSENSE

LONG

SHORT RON1

RON2

LONG

SENSE+ SENSE–

VCC

GATE

ADM1170-1

ON

SS

CSS

TIMER

GND

CTIMER

Figure 1.

Q1

VOUT = 1.8V

CLOAD

GND

Rev. A

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