−48 V Hot Swap Controller and Digital
Power Monitor with PMBus Interface
Data Sheet
ADM1075
FEATURES
PRODUCT HIGHLIGHTS
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
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.
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
Soft start capacitor controls inrush current profile with
di/dt control.
FUNCTIONAL BLOCK DIAGRAM
–48V RTN (0V)
12V
R
DROP
SPLYGD
SHDN
RESTART
5V
VIN
3.3V
2.8V
...etc.
GND
LATCH
V
CC AND
POWER
ACCUMULATOR
VEE
REFERENCE
GENERATOR
GPO1/ALERT1/CONV
GPO2/ALERT2
SDAO
DC-TO-DC
CONVERTER
DIGITAL
AND
PMBUS
C
UVH
UVL
LOAD
POWER
MULTIPLIER
UNDERVOLTAGE
AND
OVERVOLTAGE
DETECTOR
SDAI
SCL
OV
12-BIT ADC
ADR
ADC_AUX
ADC_V
PWRGD
DRAIN
FET POWER
FOLDBACK
CONTROL
PLIM
VCAP
ISET
SDA_ISO
SCL_ISO
ADuM1250
FAULT TIMER
GATE CONTROL
CURRENT LIMIT
VEE
N-FET
GATE
SENSE+
SENSE–
R
SENSE
VEE_G
TIMER
SS
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2011–2012 Analog Devices, Inc. All rights reserved.
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