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ADM1075-1ACPZ
(Rev.:RevA)

−48 V Hot Swap Controller and Digital Power Monitor with PMBus Interface

Analog Devices 

Data Sheet

−48 V Hot Swap Controller and Digital

Power Monitor with PMBus Interface

ADM1075

FEATURES

Constant power foldback for FET SOA protection

Precision (<1.0%) current and voltage measurement

Controls inrush and faults for negative supply voltages

Suitable for wide input range due to internal shunt regulator

25 mV/50 mV full-scale sense voltage

Fine tune current limit to allow use of standard sense resistor

Soft start inrush current limit profiling

1% accurate UVH and OV pins, 1.5% accurate UVL pin

PMBus/I2C interface for control, telemetry, and fault

recording

28-lead LFCSP and TSSOP

−40°C to 105°C junction temperature (TJ) operating range

APPLICATIONS

Telecommunication and data communication equipment

Central office switching

−48 V distributed power systems

Negative power supply control

High availability servers

PRODUCT HIGHLIGHTS

1. Constant Power Foldback.

Maximum FET power set by a PLIM resistor divider. This

eases complexity when designing to maintain FET SOA.

2. Adjustable Current Limit.

The current limit is adjustable via the ISET pin allowing for

the use of a standard value sense resistor.

3. 12-Bit ADC.

Accurate voltage, current, and power measurements. Also

enables calculation of energy consumption over time.

4. PMBus/I2C Interface.

PMBus fast mode compliant interface used to read back

status and data registers and set warning and fault limits.

5. Fault Recording.

Latched status registers provide useful debugging infor-

mation to help trace faults in high reliability systems.

6. Built-In Soft Start.

Soft start capacitor controls inrush current profile with

di/dt control.

FUNCTIONAL BLOCK DIAGRAM

–48V RTN (0V)

RDROP

VIN

SPLYGD

VEE

UVH

UVL

OV

VCC AND

REFERENCE

GENERATOR

UNDERVOLTAGE

AND

OVERVOLTAGE

DETECTOR

POWER

ACCUMULATOR

POWER

MULTIPLIER

12-BIT ADC

ADC_V

FET POWER

FOLDBACK

CONTROL

VCAP

ISET

FAULT TIMER

GATE CONTROL

CURRENT LIMIT

SHDN RESTART

DIGITAL

AND

PMBUS

LATCH

GPO1/ALERT1/CONV

GPO2/ALERT2

SDAO

SDAI

SCL

ADR

ADC_AUX

DC-TO-DC

CLOAD CONVERTER

12V

5V

3.3V

2.8V

...etc.

GND

PWRGD

DRAIN

PLIM

VEE

GATE

SENSE+

SENSE–

N-FET

ADuM1250

SDA_ISO

SCL_ISO

RSENSE

TIMER SS

VEE_G

VEE

–48V

Figure 1.

Rev. A

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. Specifications subject to change without notice. No

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

Trademarks and registered trademarks are the property of their respective owners.

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

Tel: 781.329.4700

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Fax: 781.461.3113 ©2011–2012 Analog Devices, Inc. All rights reserved.

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