www.analog.com/power

ADI Introduces the World’s Most Accurate Hot Swap Controller with PMBus Digital Power Monitoring

The ADM1075 is a full feature, negative voltage, hot swap controller with constant power foldback that allows boards to be safely inserted and removed from a live –48 V backplane. It features current, voltage, and power readback, and energy metering via an integrated 12-bit analog-to-digital converter (ADC), accessed using a PMBus interface. The part provides precise and robust current limiting and protection against both transient and nontransient short circuits and overvoltage and undervoltage conditions.

Contents

ADM1075: Hot Swap Controller and Digital Power Monitor with PMBus Interface . . . . . . . . . . . . . . . . . . . . . . . 2

ADM1075: Applications Diagram and Isolation Information . . . . . . . . . . . . . . 3

ADM1075: Energy Metering . . . . . . . . . 3

ADM1075: Evaluation Kits . . . . . . . . . . 3

ADM1275/ADM1276: Hot Swap Controller and Digital Power Monitor with PMBus Interface . . . . . . . . . . . . . . 4

ADM1175/ADM1176/ADM1177/ ADM1178: Hot Swap with I2C Digital Power Monitoring . . . . . . . . . . . . . . . . 6

ADM1170/ADM1171/ADM1172/ ADM4210: Positive Hot Swap Controllers . . . . . . . . . . . . . . . . . . . . . 6

ADM4073: High-Side, Voltage Output, Current-Sense Amplifier. . . . . . . . . . . . 7

ADM1191/ADM1192: Digital Power Monitors with I2C Interface. . . . . . . . . . 7

Selection Tables . . . . . . . . . . . . . . . . . 8

HOT SWAPCONTROL

CAPTURED POWERUSAGE DATA

VOLTAGE

CURRENT

POWER

–48 V

–48 V RTN

ADM1075

ENERGY (kWh)

POWER (W)

PMBUS

MICRO-PROCESSOR

SYSTEMLOAD

kWh

07753.0

W

00750.0

RSENSE

TIMER

FETPOWER

GATE

IIN

VOUT

INRUSH CURRENTIS LIMITED

Infrastructure for the evolving datacenter. Switches and routers for carrier, access, enterprise networks.

Pluggable subsystems and modules.

The AnAlog DeviCes AppliCATions BulleTin 2012

hoT sWAp AnD poWeR MoniToRing

ADM1075: Hot Swap Controller and Digital Power Monitor with PMBus Interface

The ADM1075 is a full feature, negative voltage, hot swap controller with constant power foldback that allows boards to be safely inserted and removed from a live –48 V backplane. It also features current, voltage, power readback, and energy metering via an integrated 12-bit analog-to-digital converter (ADC), accessed using a PMBus interface.

DIGITALAND

PMBUS

POWER ACCUMULATOR

DRAIN

RESTARTSHDN

LATCHGPO1GPO2SDAOSDAISCLADR

ADC_AUX

PWRGD

SPLYGD

V

VIN

ADC_V

VCAP

UVL

UVH

SENSE+

GATE

PLIM

N-FET

RSENSE

RDROP

–48V RTN (0V)

–48V

VEE

SENSE-

ISET

TIMER SS VEE_G VEE

OV

VEE

POWER MULTIPLIER

12-BIT ADC

FET POWERFOLDBACKCONTROL

FAULT TIMER

GATE CONTROL

CURRENT LIMIT

UNDERVOLTAGEAND

OVERVOLTAGEDETECTOR

CC ANDREFERENCEGENERATOR

Shunt resistor: flexible operating range.

Separate UVH/UVL pins for accurate hysteresis settings.

High accuracy 1% UVH, UVL, OV thresholds.

Two separate ADC inputs for voltage monitoring.

ISET: resistor adjustable current limit.

High accuracy current limit (2%) allows for tighter FET SOA protection.

TIMER cap: sets time, FET remains on while current in regulation.

SS cap: sets soft start current profile.

Separate ground pin for gate pull-down return.

Separate VEE and SENSE—ensures minimal voltage drop in sense trace.

RSENSE: low insertion loss 15 mV to 25 mV ADM1075-1 30 mV to 50 mV ADM1075-2.

GATE pin: responds to short circuits within 370 ns.

High gate drive (12 V) à lowest RDSON when FET fully enhanced.

PLIM: resistor divider sets constant power foldback.

Power-good output determined from drain and gate voltages.

PMBus (I2C) interface.

General-purpose output pins.

Supply good active low when input within programmed voltage window.

12-bit ADC ±1% accurate for current, voltage and power readback.

SHDN: level triggered shutdown of hot swap.

RESTART: falling edge triggered 10 sec restart.

Hot Swap and E-Fuse Applications

• Telecommunications and data communication equipment

• Optical networks

• –48 V distributed power systems

• Central office switching

• High availability servers

• Negative power supply control

Features

• The ADM1075 features best-in-class current-sense accuracy (±0.7%)

• Constant power foldback for improved FET SOA protection

• Response time to short circuit <1 µs

• Resistor-programmable current limit

• 5 mV to 25 mV for ADM1075-1

• 10 mV to 50 mV for ADM1075-2

• ±1% accurate, 12-bit ADC for current, VIN/VAUX readback

• Suitable for wide input range due to internal shunt regulator

• High gate drive voltage to ensure lowest RDSON

• Fault recording with latched status register

• 28-lead LFCSP and 28-lead TSSOP

0

1

2

3

4

5

6

7

0 10 20 30 40 50 60

AC

CU

RA

CY

(%)

SENSE VOLTAGE (mV)

ADM1075-1

ADM1075-2

2 | Hot Swap and Power Monitoring

ADM1075: Applications Diagram and Isolation Information

Isolation is usually required between the –48 V backplane and any microcontroller communicating with the ADM1075 device.

The ADuM1250 is an ideal companion device for I2C isolation. The ADuM1250 is an I2C isolator based on iCoupler® chip scale transformer technology from Analog Devices.

There are also other iCoupler devices available if isolation of other digital signals is required, for example, the ADuM5402, which also provides an integrated isolated dc-to-dc converter.

ADM1075: Energy Metering

A PMBus interface allows a controller to read current, voltage, and power from the ADC. The ADC_V input voltage and IOUT current measurement values are multiplied by the ADM1075 to give the input power value. There is also an energy accumulator register—each time a power calculation is done, the power value is added to the energy accumulator register. This allows for the calculation of average power as well as instantaneous power measurements.

ADM1075: Evaluation Kits

The ADM1075 full feature evaluation board can be purchased on the ADM1075 Web page along with the serial I/O interface connector required to communicate with the evaluation board. The connector enables communication between the I2C port on the evaluation board and the evaluation software via the USB port on a PC. All relevant documentation and details can be found on the ADM1075 product page www.analog.com/ADM1075.

ADP1046

ISOLATED DIGITALDC-TO-DC BRICK

ADuM1250

I2C ISOLATOR

ADM1075

–48V HOT SWAP ANDDIGITAL POWER MONITOR

PROCESSOR

3.3V MANAGEMENT BUS

RTN

–48V

–48V

SDA_ISO

SCL_ISO

SDA

SCL

CURRENTVOLTAGE VOLTAGEENERGYPOWER

ADM1075

÷ kWh

�P

RSENSE

VOLTAGE

ADC

ADC_V

POWER

ENERGY

CURRENT

�ENERGY

ADM1075

�

Evaluation kits available.ADM1075 evaluation software.

www.analog.com/power | 3

ADM1275/ADM1276: Hot Swap Controller and Digital Power Monitor with PMBus Interface

Q1

GATE

SENSE+

TIMERTIMER

ADM1275/ADM1276

GND

RSENSE

SENSE–

VCC

VCP

2V TO 20V

2.95VTO20V

VCAP

IOUTUV

OV

1.0V

1.0VVOUT

12-BITADC SCL

SDAADR

LDOCHARGE

PUMP

TIMEOUT

GPO2/ALERT2

PWRGDGPO1/ALERT1/CONV

LATCH

TIMERON

TIMER ON

VCBOSSS

CURRENTLIMIT

FLB

ISET

TIMEOUT

CURRENTLIMIT

CONTROL

REFSELECT

1.0V

GATEDRIVE/ LOGIC

VOUTSENSE+

IOUT

LOGICAND

PMBUS

×50+

+

–

–

+–

+–

FLB pin: actively lowers the current limit as voltage across FET increases à tighter FET SOA protection.

RSENSE: measure system current. Hot swap control and fault protection.

Adjust current limit to allow for standard sense resistor value.

Low insertion loss (5 mV to 25 mV).Q1: current through sense resistor limited by controlling gate of FET.

GATE pin: responds to short circuit within 370 ns.

Gate drive/logic block: high gate drive à lowest RDSON when FET fully enhanced.

Current levels à ability to drive multiple FETs to share current.

12-bit ADC: ±1% accurate ADC for current, voltage, and power readback.

TIMER cap: sets time, FET remains on while current in regulation.

SS cap: sets inrush current profile.

Current limit control: high accuracy current limit (2%) à tighter FET SOA protection.

ISET: resistor adjustable current limit.

UV/OV pins: FET gate pulled low if under/overvoltage detected.

Evaluation kits available.

ADM1276—energy metering.

ADM1275/ADM1276 evaluation software.

4 | Hot Swap and Power Monitoring

Power Monitoring and Energy Metering

A PMBus interface allows a controller to read current, voltage (ADM1275/ADM1276), and power (ADM1276 only) from the ADC. The VIN input voltage and IOUT current measurement values are multiplied by the ADM1276 to give the input power value. There is also an energy accumulator register — each time a power calculation is done, the power value is added to the energy accumulator register. This allows for the calculation of average power, as well as instantaneous power measurements.

GND

+12V

ADM1276

ENERGY (kWh)

POWER (W)

CURRENT

CURRENT

VOLTAGE

VOLTAGE

VOLTAGE

VOLTAGE

ENERGYPOWER

ADM1276

PMBUS

MICRO-PROCESSOR

SYSTEMLOAD

kWh

07753.0

W

00750.0

ADM1275

RSENSE

RSENSE

VOLTAGE

ADC POWER

ENERGY

CURRENT

ADM1275/ADM1276ADM1276

÷ kWh

�P�ENERGY

�

Features

• The ADM1275/ADM1276 feature best-in-class current-sense accuracy (±0.7%)

• High accuracy over a wide sense voltage range ensures more accurate measurements at normal operating levels

• Controls supply voltages from 2 V to 20 V

• 370 ns response time to short circuit

• Resistor-programmable 5 mV to 25 mV current limit

• ±1% accurate, 12-bit ADC for current, VIN/VOUT readback

• Charge-pumped gate drive for multiple external N-channel FETs

• High gate drive voltage to ensure lowest RDSON

• Foldback for tighter FET SOA protection

• PMBus fast mode compliant interface

• 16-lead QSOP and 20-lead QSOP/LFCSP

5

3

4

2

1

0

CURRENT-SENSE VOLTAGE (mV)

AC

CU

RA

CY

(%)

0 10 20 30

128× AVERAGINGVIN = 12V, –40ºC TO +85ºC

Evaluation kits available.

Hot Swap and E-Fuse Applications

• Servers

• Base stations

• Line cards

• Power monitoring and control/power budgeting

• Telecommunications and data communication equipment

• Central office equipment

www.analog.com/power | 5

ADM1175/ADM1176/ADM1177/ADM1178: Hot Swap with I2C Digital Power Monitoring

The ADM1175/ADM1176/ADM1177/ADM1178 are a series of integrated hot swap controllers and current-sense amplifiers that offer digital current and voltage monitoring via an on-chip 12-bit analog-to-digital converter (ADC), communicated through an I2C interface.

Features

• Controls supply voltages from 3.15 V to 16.5 V

• Manual convert pin: ADM1175

• Additional address pin: ADM1176

• Soft start pin: ADM1177

• Overcurrent alert pin: ADM1178

• ±3% accurate hot swap current limit level

• 12-bit ADC for current and voltage readback

• Charge pumped gate drive for N-channel FET

• Adjustable current limit with circuit breaker

• Automatic retry (-1 model) or latch-off (-2 model) on current fault

• I2C fast mode-compliant interface

• 10-lead MSOP

V

I

0

1SENSE

VCC

CONV

MUX

FET DRIVECONTROLLER

GND

UV COMPARATOR

CURRENT-SENSE

AMPLIFIER

A

SDA

SCL

ADR

GATE

TIMER

12-BITADC

I2C

ADM1175

ON

1.3V

ADM1170/ADM1171/ADM1172/ADM4210: Positive Hot Swap Controllers

The ADM1170/ADM1171/ADM1172/ADM4210 are a series of low voltage, positive, high-side, hot swap controllers that safely enable a printed circuit board to be removed from and inserted into 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 an N-channel FET.

LONG

VIN = 12V

RON1

RON2

VCC

RSENSE

HOT SWAP CONTROL

Q1

CTIMER

LONG

SHORT

SENSE

ON

SS

TIMER

GND

ADM1177

GATE

GND GND

CLOAD

CSS

CONTROLLER

WATTS

�PSDASCL

ADR

CURRENT VOLTAGEVOLTAGE

Features

• Separate VCC pin, soft start pin— ADM1170

• Current-sense output, soft start pin — ADM1171

• Power fail detector — ADM1172

• Controls supply rails from 1.6 V to 16.5 V

• 50 mV sense voltage limit providing minimal voltage drop losses

• Charge pumped gate drive for external N-channel FET

• Automatic retry (-1 model) or latch-off (-2 model)

• 8-lead TSOT (ADM117x)/6-lead TSOT (ADM4210)

LONG

VIN = 12V VOUT = 12V

VCC

RSENSE Q1

CTIMER

LONG

SHORTSENSE

GATEON

TIMER

PFI

PFO

ADM1172

GND

GND

GND

RON1

RON2

RPR1

CLOAD

RPR2

�P

6 | Hot Swap and Power Monitoring

ADM4073: High-Side, Voltage Output, Current-Sense Amplifier

The ADM4073 is a low cost, high-side, current-sense amplifier ideal for small portable applications. The device is available in three different gain models. The voltage on the output pin is determined by the current flowing through the selectable external sense resistor and the gain of the version selected.

Features

• Low cost, compact current-sense solution

• Three available gain versions (20/50/100)

• Typical ±1.0% full-scale accuracy

• Wide 1.8 MHz bandwidth

• 3 V to 28 V operating supply

• Wide 2 V to 28 V common-mode range; operates from −40°C to +125°C

• Available in a 6-lead SOT-23 package

2V TO 28V

3V TO 28V

0.1�F

VOUTRSENSE

ILOAD

IRG1

OUT

RS+

GND

AV

RS–

VCCRG2

RGD = 12k�

RG1

ADM4073IRGD

CURRENTMIRROR

ADM1191/ADM1192: Digital Power Monitors with I2C Interface

The ADM1191 and ADM1192 are integrated current-sense amplifiers that offer digital current and voltage monitoring via an on-chip 12-bit analog-to-digital converter (ADC), communicated through an I2C interface.

Features

• Sensing from 3.15 V to 26 V

• ±1.5% current-sense accuracy

• 12-bit ADC for current and voltage readback

• ALERTB output for overcurrent interrupts

• I2C fast mode-compliant interface

• Up to 16 devices on the same bus

• 10-lead MSOP

• CONV, A1/A0, ALERTB—ADM1191

• TIMER, CLRB, ALERT—ADM1192

V

I

0

1

ADM1191

SENSE

SETV

VCC

CONV

MUX

ALERT

GND

COMPARATOR

CURRENT-SENSE

AMPLIFIER

A

SDA

SCL

A1

A0

ALERTB

12-BITADC

I2C

RSENSE

CONTROLLERADM1192

SENSEVCC

SDASCL

GND

GND

ALERT

CLRB

ADR

3.15V TO 26V

WATTS

SETV

TIMER

RON2

CTIMER

�P

CURRENT VOLTAGEVOLTAGE

www.analog.com/power | 7

low voltage positive hot swap Controllers with Digital power Monitor

part number voltage Range (v)

undervoltage Detection/overvoltage

Detection

Digital v and i Readback Additional Features package price ($u.s.)1

ADM1175 3.15 to 16.5 ON pin (UV); ON pin (OV)

I2C interface with four addresses Convert pin 10-lead MSOP 2.53

ADM1176 3.15 to 16.5 ON pin (UV) I2C interface with 16 addresses — 10-lead MSOP 2.53

ADM1177 3.15 to 16.5 ON pin (UV) I2C interface with four addresses Soft start 10-lead MSOP 2.53

ADM1178 3.15 to 16.5 ON pin (UV) I2C interface with four addresses ALERTB pin 10-lead MSOP 2.73

ADM1275 New 2 to 20 UV pin, OV pin PMBus interface with four addresses

Soft start, foldback, fast gate shutdown, adjustable current-

sense limit

16-lead QSOP, 20-lead QSOP, 20-lead LFCSP

4.494.994.99

ADM1276 New 2 to 20 UV pin, OV pinPMBus interface with four addresses; also

power readback

Soft start, foldback, fast gate shutdown, adjustable current-

sense limit20-lead LFCSP 5.29

low voltage positive hot swap Controllers

part number voltage Range (v)

undervoltage Detection/overvoltage

DetectionAdditional Features package price ($u.s.)1

ADM1170 1.6 to 16.5 ON pin (UV) Soft start, separate VCC pin 8-lead TSOT 2.13

ADM1171 2.7 to 16.5 ON pin (UV) Soft start, current-sense output 8-lead TSOT 2.23

ADM1172 2.7 to 16.5 ON pin (UV) Power fail detector 8-lead TSOT 2.02

ADM4210 2.7 to 16.5 ON pin (UV) — 6-lead TSOT 1.99

–48 v hot swap Controllers

part number voltage Range (v)

undervoltage Detection/overvoltage

Detection

Digital v and i Readback Additional Features package price ($u.s.)1

ADM1070 Shunt regulated UV/OV pin — — 6-lead SOT-23 1.57

ADM1073 Shunt regulated UV pin, OV pin — Soft start, drain pin monitoring,

additional I/Os 14-lead TSSOP 2.13

ADM1075 New Shunt regulated UVH pin, UVL pin, OV pin

PMBus interface withfour addresses; also

power readback

Soft start, constant powerfoldback, fast gate shutdown,adjustable current-sense limit

28-lead LFCSP, 28-lead TSSOP 4.99

Digital power Monitors

part number voltage Range (v)

overcurrent Timer Digital v and i Readback Additional Features package price

($u.s.)1

ADM1191 3.15 to 26 — I2C interface with 16 addresses Programmable alert output, convert pin 10-lead MSOP 1.92

ADM1192 3.15 to 26 Capacitor programmable I2C interface with four addresses Programmable alert output,

timer CLR pin 10-lead MSOP 1.92

Current-sense Amplifiers — high side

part number CM Range (v) gain Max sense voltage (mv)

supply Range (v) Accuracy (Typ) package price

($u.s.)1

ADM4073T 2 to 28 20 150 3 to 28 1% 6-lead SOT-23 0.99

ADM4073F 2 to 28 50 150 3 to 28 1% 6-lead SOT-23 0.99

ADM4073H 2 to 28 100 150 3 to 28 1% 6-lead SOT-23 0.99

1All prices are in USD in quantities greater than 1000.

All prices in this bulletin are in USD in quantities greater than 1000 (unless otherwise noted), recommended lowest grade resale, FOB U.S.A.

I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).

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