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ADM1272 Datasheet

High Voltage Positive Hot Swap Controller and Digital Power Monitor

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Data Sheet
High Voltage Positive Hot Swap Controller
and Digital Power Monitor with PMBus
ADM1272
FEATURES
Controls supply voltages from 16 V to 80 V (absolute
maximum 120 V)
High voltage (80 V) IPC-9592 compliant packaging
<500 ns response time to short circuit
FET energy monitoring for adaptable FET SOA protection
Gate boost mode for fast recovery from OC transients
Programmable random start mode to stagger power-on
FET fault detection
Remote temperature sensing with programmable warning
and shutdown thresholds
Programmable 2.5 mV to 30 mV system current-limit setting
range
±0.85% accurate current measurement with 12-bit ADC
ILOAD, VIN, VOUT, temperature, power, and energy telemetry
Programmable start-up current limit
Programmable linear output voltage soft start
1% accurate UV and OV thresholds
Programmable hot swap restart function
2 programmable GPIO pins
Reports power and energy consumption
Peak detect registers for current, voltage, and power
PMBus fast mode compliant interface
48-lead 7 mm × 8 mm LFCSP
APPLICATIONS
48 V/54 V systems
Servers
Power monitoring and control/power budgeting
Central office equipment
Telecommunication and data communication equipment
Industrial applications
GENERAL DESCRIPTION
The ADM1272 is a hot swap controller that allows a circuit board
to be removed from or inserted into a live backplane. It also features
current, voltage, and power readback via an integrated 12-bit
analog-to-digital converter (ADC), accessed using a PMBus™
interface. This device is able to withstand up to 120 V, which
makes it very robust in surviving surges and transients commonly
associated with high voltage systems, usually clamped using
protection devices such as transient voltage suppressors (TVSs)
that can often exceed 100 V.
The load current, ILOAD, is measured using an internal current
sense amplifier that measures the voltage across a sense resistor
in the power path via the SENSE+ and SENSE− pins. A default
current limit sense voltage of 30 mV is set, but this limit can be
Rev. 0
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adjusted down, if required, using a resistor divider network
from the VCAP regulator output voltage to the ISET pin. An
additional resistor can also be placed from ISET to VIN (or VOUT) to
allow the current limit to track inversely with the rail voltage.
This resistor allows an approximate system power limit to be used.
The ADM1272 limits the current through the sense resistor by
controlling the gate voltage of an external N channel field effect
transistor (FET) in the power path. The sense voltage, and there-
fore the load current, is maintained below the preset maximum.
The ADM1272 protects the external FET by monitoring and
limiting the energy transfer through the FET while the current is
being controlled. This energy limit is set by the choice of compo-
nents connected to the EFAULT pin (for fault protection mode)
and the ESTART pin during startup. Therefore, different energy
limits can be set for start-up and normal fault conditions.
During startup, inrush currents are maintained very low and
different areas of the safe operating area (SOA) curve are of
interest, whereas during fault conditions, the currents can be
much higher.
The controller uses the drain to source voltage (VDS) across the
FET to set the current profile of the EFAULT and ESTART pins
and, therefore, the amount of much energy allowed to be
transferred in the FET. This energy limit ensures the MOSFET
remains within the SOA limits. Optionally, use a capacitor on
the DVDT pin to set the output voltage ramp rate, if required.
In case of a short-circuit event, a fast internal overcurrent
detector responds in hundreds of ns and signals the gate to shut
down. A 1.5 A pull-down device ensures a fast FET response. The
gate then recovers control within 50 µs to ensure minimal
disruption during conditions, such as line steps and surges. The
ADM1272 features overvoltage (OV) and undervoltage (UV)
protection, programmed using external resistor dividers on the
UVH, UVL, and OV pins. The use of two pins for undervoltage
allows independent accurate rising and falling thresholds. The
PWRGD output pin signals when the output voltage is valid and
the gate is sufficiently enhanced. The validity of VOUT is
determined using the PWGIN pin.
The 12-bit ADC measures the voltage across the sense resistor,
the supply voltage on the SENSE+ pin, the output voltage, and
the temperature using an external NPN/PNP device. A PMBus
interface allows a controller to read data from the ADC. As
many as 16 unique I2C addresses can be selected, depending on
how the two ADRx pins are connected. The ADM1272 is available
in a custom 48-lead LFCSP (7 mm × 8 mm) with a pinstrap mode
that allows the device to be configured for automatic retry or
latchoff when an overcurrent (OC) fault occurs.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2017 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

ADM1272 Datasheet

High Voltage Positive Hot Swap Controller and Digital Power Monitor

No Preview Available !

ADM1272
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 3
Functional Block Diagram .............................................................. 4
Specifications..................................................................................... 5
Power Monitoring Accuracy Specifications.............................. 9
Serial Bus Timing Characteristics ............................................ 10
Absolute Maximum Ratings.......................................................... 11
Thermal Characteristics ............................................................ 11
ESD Caution................................................................................ 11
Pin Configuration and Function Descriptions........................... 12
Typical Performance Characteristics ........................................... 15
Theory of Operation ...................................................................... 20
Powering the ADM1272 ............................................................ 20
UV and OV ................................................................................. 20
Hot Swap Current Sense Inputs................................................ 20
Current-Limit Modes.................................................................. 21
Setting the Current Limits (ISET/ISTART) ............................ 21
Setting a Linear Output Voltage Ramp at Power-Up (DVDT)
....................................................................................................... 23
Safe Operating Area Protection (ESTART/EFAULT)............ 24
FET Gate Drive ........................................................................... 24
Fast Response to Severe Overcurrent ...................................... 24
MCB ............................................................................................. 25
RND ............................................................................................. 25
Voltage Transients ...................................................................... 25
Surge and Transient Recovery .................................................. 25
Power Good................................................................................. 25
Fault Pin....................................................................................... 26
Restart Pin ................................................................................... 26
Hot Swap Retry ........................................................................... 26
ENABLE Input ............................................................................ 26
Remote Temperature Sensing ................................................... 26
FET Health .................................................................................. 27
Power Monitor ............................................................................ 27
PMBus Interface ............................................................................. 29
Device Addressing...................................................................... 29
SMBus Protocol Usage............................................................... 29
Packet Error Checking............................................................... 29
Partial Transactions on I2C Bus................................................ 30
SMBus Message Formats ........................................................... 30
Group Commands ..................................................................... 32
Hot Swap Control Commands ................................................. 32
ADM1272 Information Commands ........................................ 32
Status Commands ...................................................................... 33
GPO and Alert Pin Setup Commands..................................... 33
Power Monitor Commands ...................................................... 34
Warning Limit Setup Commands ............................................ 35
PMBus Direct Format Conversion .......................................... 35
Voltage And Current Conversion Using LSB Values............. 36
Applications Information .............................................................. 38
General-Purpose Output Pin Behavior................................... 38
Faults and Warnings .................................................................. 38
Generating an Alert ................................................................... 38
Handling/Clearing an Alert ...................................................... 38
SMBus Alert Response Address ............................................... 39
Example Use of SMBus ARA .................................................... 39
Digital Comparator Mode......................................................... 39
Register Details ............................................................................... 40
Operation Register ..................................................................... 40
Clear Faults Register .................................................................. 40
PMBus Capability Register ....................................................... 40
Output Voltage Overvoltage Warning Limit Register........... 40
Output Voltage Undervoltage Warning Limit Register......... 41
Output Current Overcurrent Warning Limit Register.......... 41
Overtemperature Fault Limit Register .................................... 41
Overtemperature Warning Limit Register.............................. 41
Input Voltage Overvoltage Warning Limit Register .............. 41
Input Voltage Undervoltage Warning Limit Register............ 42
Overpower Warning Limit Register ........................................ 42
Status Byte Register .................................................................... 42
Status Word Register.................................................................. 43
Output Voltage Status Register................................................. 44
Output Current Status Register ................................................ 44
Input Status Register .................................................................. 44
Temperature Status Register ..................................................... 45
Manufacturer Specific Status Register..................................... 45
Read Energy Register................................................................. 46
Read Input Voltage Register...................................................... 46
Rev. 0 | Page 2 of 57


Part Number ADM1272
Description High Voltage Positive Hot Swap Controller and Digital Power Monitor
Maker Analog Devices
Total Page 30 Pages
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