ADM1070ARTZ-REEL7【PDF 1/16 页】IC CTRLR HOTSWAP -48V SOT23-6

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REV.0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties that

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices.

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

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

?Analog Devices, Inc., 2002

ADM1070

48 V Hot Swap Controller

FUNCTIONAL BLOCK DIAGRAM

AND

REFERENCE

GENERATOR

OVER-UNDER

VOLTAGE DETECTION

CIRCUIT

FAULT TIMER AND

CONTROL

OSCILLATOR

SENSE

48V

UV/OV

TIMER

DROP

12V

16k

REF

100mV

45A

GATE

SENSE

LOAD

OUT

( )*

*OPTIONAL TIMER CAPACITOR

ADM1070

FEATURES

Allows Safe Board Insertion and Removal from a Live

48 V Backplane

Typically Operates from 36 V to 80 V

Tolerates Transients up to 200 V (Limited by External

Components)

Accurate Programmable Linear Current Limit for

In-Rush Control and Short Circuit Protection

Programmable Timeout in Current Limit

Limited Consecutive Retry:

Auto-Restart after Current Limit Timeout

Shutdown after Seven Consecutive Auto Restarts

Provides Immunity from Step Induced Current Spikes

Default Timing Provided with no TIMER Capacitor

Single Pin Undervoltage/Overvoltage Detection

Programmable Operating Voltage Window

Programmable Undervoltage/Overvoltage Time Filter

Small 6-Lead SOT-23 Package

APPLICATIONS

Central Office Switching

48 V Distributed Power Systems

Negative Power Supply Control

Hot Board Insertion

Electronic Circuit Breaker

High Availability Servers

Programmable Current Limiting Circuit

48 V Power Supply Modules

GENERAL DESCRIPTION

The ADM1070 is a negative voltage hot swap controller that

allows a board to be safely inserted and removed from a live

48 V backplane. The part achieves this by providing robust

current limiting, protection against transient and nontransient

short circuits and overvoltage and undervoltage conditions. The

ADM1070 typically operates from a negative voltage of up to

80 V and can tolerate transient voltages of up to 200 V.

In-rush current is limited to a programmable value by control-

ling the gate drive of an external N-channel FET. The current

limit can be controlled by the choice of the sense resistor,

SENSE

. Added control of the in-rush current is provided by an

on-chip timer that uses pulsewidth modulation to allow the

maximum current to flow for only 3% of the time. An autorestart

occurs after a current limit timeout. After seven successive

autorestarts, the fault will be latched and the part goes into

shutdown with the result that the external FET is disabled until

the power is reset.

The ADM1070 also features single-pin undervoltage and over-

voltage detection. The FET is turned off if a nontransient

voltage less than the undervoltage threshold, typically 36 V, or

greater than the overvoltage threshold, typically 77 V, is detected

on the UV/OV Pin. The operating voltage window of the

ADM1070 is programmable and is determined by the ratio R1/R2.

Time filtering on the undervoltage and overvoltage detection

and current limiting is programmable via the TIMER Pin. An

external capacitor connected between the TIMER Pin and V

determines the undervoltage/overvoltage time filter and the

timeout in current limit. If the pin is tied to V

, the time filter

values and the current limit timeout revert to default figures.

The ADM1070 is fabricated using BiCMOS technology for mini-

mal power consumption. The part is available in a small

6-Lead SOT-23 package.

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