The Analog Devices applications Bulletin 2012 HOT SWAP AND POWER MONITORING 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 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. 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 HOT SWAP CONTROL TIMER ADM1170/ADM1171/ADM1172/ ADM4210: Positive Hot Swap Controllers . . . . . . . . . . . . . . . . . . . . . . 6 GATE ADM4073: High-Side, Voltage Output, Current-Sense Amplifier . . . . . . . . . . . . 7 VOUT ADM1191/ADM1192: Digital Power Monitors with I2C Interface . . . . . . . . . . 7 CAPTURED POWER USAGE DATA IIN INRUSH CURRENT IS LIMITED VOLTAGE CURRENT FET POWER POWER Selection Tables . . . . . . . . . . . . . . . . . . 8 POWER (W) ADM1075 Infrastructure for the evolving datacenter. www.analog.com/power SYSTEM LOAD W 00750.0 ENERGY (kWh) –48 V RTN –48 V PMBUS MICROPROCESSOR kWh 07753.0 RSENSE Switches and routers for carrier, access, enterprise networks. Pluggable subsystems and modules. 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. Shunt resistor: flexible operating range. Supply good active low when input within programmed voltage window. SHDN: level triggered shutdown of hot swap. RESTART: falling edge triggered 10 sec restart. 12-bit ADC ±1% accurate for current, voltage and power readback. PMBus (I2C) interface. General-purpose output pins. –48V RTN (0V) RDROP Separate UVH/UVL pins for accurate hysteresis settings. V CC AND REFERENCE GENERATOR VEE UVH UVL OV High accuracy 1% UVH, UVL, OV thresholds. SHDN RESTART POWER ACCUMULATOR DIGITAL AND PMBUS POWER MULTIPLIER UNDERVOLTAGE AND OVERVOLTAGE DETECTOR Power-good output determined from drain and gate voltages. LATCH GPO1 GPO2 SDAO SDAI SCL ADR 12-BIT ADC PLIM: resistor divider sets constant power foldback. ADC_AUX ADC_V PWRGD FET POWER FOLDBACK CONTROL Two separate ADC inputs for voltage monitoring. VCAP DRAIN PLIM FAULT TIMER ISET VEE GATE CONTROL GATE CURRENT LIMIT SENSE+ GATE pin: responds to short circuits within 370 ns. N-FET RSENSE High gate drive (12 V) à lowest RDSon when FET fully enhanced. SENSE- ISET: resistor adjustable current limit. High accuracy current limit (2%) allows for tighter FET SOA protection. SPLYGD V IN TIMER SS VEE_G Rsense: low insertion loss 15 mV to 25 mV ADM1075-1 30 mV to 50 mV ADM1075-2. VEE –48V 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. Hot Swap and E-Fuse Applications • Telecommunications and data communication equipment • Central office switching • Optical networks • High availability servers • –48 V distributed power systems • Negative power supply control 7 Features • The ADM1075 features best-in-class current-sense accuracy (±0.7%) 6 • Constant power foldback for improved FET SOA protection • 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 5 ACCURACY (%) • Response time to short circuit <1 µs ADM1075-1 4 3 ADM1075-2 2 1 • High gate drive voltage to ensure lowest RDSON • Fault recording with latched status register • 28-lead LFCSP and 28-lead TSSOP | Hot Swap and Power Monitoring 2 0 0 10 20 30 40 SENSE VOLTAGE (mV) 50 60 ADM1075: Applications Diagram and Isolation Information Isolation is usually required between the –48 V backplane and any microcontroller communicating with the ADM1075 device. RTN 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. ADP1046 ISOLATED DIGITAL DC-TO-DC BRICK –48V 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. 3.3V MANAGEMENT BUS –48V ADM1075: Energy Metering ADM1075 –48V HOT SWAP AND DIGITAL POWER MONITOR SDA_ISO ADuM1250 SDA SCL_ISO I2C SCL ISOLATOR PROCESSOR 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 ADC_V ADM1075 VOLTAGE RSENSE ADC 𝛍P 𝚫ENERGY POWER VOLTAGE CURRENT POWER ENERGY CURRENT VOLTAGE ÷ kWh 𝚫 ENERGY 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. ADM1075 evaluation software. Evaluation kits available. www.analog.com/power | 3 ADM1275/ADM1276: Hot Swap Controller and Digital Power Monitor with PMBus Interface RSENSE: measure system current. Hot swap control and fault protection. Adjust current limit to allow for standard sense resistor value. Q1: current through sense resistor limited by controlling gate of FET. Low insertion loss (5 mV to 25 mV). RSENSE 2V TO 20V UV/OV pins: FET gate pulled low if under/overvoltage detected. 2.95V TO 20V SENSE+ VCAP ISET: resistor adjustable current limit. OV IOUT + 1.0V – – 1.0V + REF SELECT 1.0V SS GATE DRIVE/ LOGIC TIMER SENSE+ VOUT IOUT SS cap: sets inrush current profile. GATE VOUT TIMEOUT CURRENT LIMIT TIMER ON + – CURRENT LIMIT CONTROL VCBOS TIMER ON TIMER GATE pin: responds to short circuit within 370 ns. CHARGE PUMP VCP LDO ISET Current limit control: high accuracy current limit (2%) à tighter FET SOA protection. SENSE– + – ADM1275/ADM1276 ×50 VCC UV Q1 FLB TIMEOUT 12-BIT ADC LOGIC AND PMBUS PWRGD GPO1/ALERT1/CONV GPO2 /ALERT2 LATCH SCL SDA ADR GND TIMER cap: sets time, FET remains on while current in regulation. ADM1275/ADM1276 evaluation software. | Hot Swap and Power Monitoring 4 12-bit ADC: ±1% accurate ADC for current, voltage, and power readback. Evaluation kits available. 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. FLB pin: actively lowers the current limit as voltage across FET increases à tighter FET SOA protection. ADM1276—energy metering. 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. RSENSE POWER (W) ADM1276 PMBUS SYSTEM LOAD W 00750.0 ENERGY (kWh) +12V MICROPROCESSOR kWh 07753.0 GND Evaluation kits available. ADM1275 ADM1275/ADM1276 ADM1276 VOLTAGE VOLTAGE RSENSE ADC CURRENT VOLTAGE CURRENT 𝛍P ADM1276 POWER VOLTAGE POWER CURRENT ENERGY 𝚫ENERGY VOLTAGE ÷ ENERGY kWh 𝚫 Hot Swap and E-Fuse Applications • Servers • Power monitoring and control/power budgeting • Base stations • Telecommunications and data communication equipment • Line cards • Central office equipment Features • The ADM1275/ADM1276 feature best-in-class current-sense accuracy (±0.7%) 5 • High accuracy over a wide sense voltage range ensures more accurate measurements at normal operating levels • 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 ACCURACY (%) • Controls supply voltages from 2 V to 20 V 128× AVERAGING VIN = 12V, –40ºC TO +85ºC 4 3 2 • Charge-pumped gate drive for multiple external N-channel FETs • High gate drive voltage to ensure lowest RDSON 1 • Foldback for tighter FET SOA protection • PMBus fast mode compliant interface • 16-lead QSOP and 20-lead QSOP/LFCSP 0 0 10 20 30 CURRENT-SENSE VOLTAGE (mV) 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 CONV ADM1175 • Additional address pin: ADM1176 MUX V VCC • Soft start pin: ADM1177 • Overcurrent alert pin: ADM1178 I A • ±3% accurate hot swap current limit level SDA 0 12-BIT ADC 1 I2C SENSE SCL ADR CURRENTSENSE AMPLIFIER • 12-bit ADC for current and voltage readback • Charge pumped gate drive for N-channel FET FET DRIVE CONTROLLER ON • Adjustable current limit with circuit breaker GATE 1.3V • Automatic retry (-1 model) or latch-off (-2 model) on current fault • I2C fast mode-compliant interface UV COMPARATOR TIMER GND • 10-lead MSOP HOT SWAP CONTROL VIN = 12V RSENSE LONG Q1 CLOAD VCC SENSE GATE CONTROLLER WATTS ADM1177 SHORT RON1 ON CSS TIMER RON2 GND LONG GND CTIMER 𝛍P SDA SCL SS ADR GND VOLTAGE CURRENT VOLTAGE 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. Features VIN = 12V RSENSE LONG Q1 VOUT = 12V • Separate VCC pin, soft start pin— ADM1170 CLOAD • Current-sense output, soft start pin — ADM1171 VCC SHORT • Power fail detector — ADM1172 RON1 • Controls supply rails from 1.6 V to 16.5 V RON2 TIMER • Charge pumped gate drive for external N-channel FET • 8-lead TSOT (ADM117x)/6-lead TSOT (ADM4210) | Hot Swap and Power Monitoring 6 RPR1 GATE ADM1172 PFI • 50 mV sense voltage limit providing minimal voltage drop losses • Automatic retry (-1 model) or latch-off (-2 model) SENSE ON GND LONG PFO GND CTIMER GND 𝛍P RPR2 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 ILOAD RSENSE 2V TO 28V • Three available gain versions (20/50/100) • Typical ±1.0% full-scale accuracy VCC 3V TO 28V VOUT RS– RS+ IRG1 RG1 RG2 0.1𝛍F • Wide 1.8 MHz bandwidth AV • 3 V to 28 V operating supply • Wide 2 V to 28 V common-mode range; operates from −40°C to +125°C OUT CURRENT MIRROR • Available in a 6-lead SOT-23 package IRGD RGD = 12k𝛀 ADM4073 GND 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 CONV ADM1191 • ±1.5% current-sense accuracy • 12-bit ADC for current and voltage readback V VCC • ALERTB output for overcurrent interrupts • I2C fast mode-compliant interface A SENSE • Up to 16 devices on the same bus I CURRENTSENSE AMPLIFIER • 10-lead MSOP • CONV, A1/A0, ALERTB—ADM1191 SDA 0 12-BIT ADC 1 I2C A1 A0 MUX SETV ALERT • TIMER, CLRB, ALERT—ADM1192 SCL ALERTB COMPARATOR GND 3.15V TO 26V RSENSE VCC SENSE ADM1192 SDA SCL SETV RON2 CONTROLLER WATTS 𝛍P ALERT CLRB TIMER GND CTIMER ADR GND VOLTAGE CURRENT VOLTAGE www.analog.com/power | 7 Low Voltage Positive Hot Swap Controllers with Digital Power Monitor Voltage Range (V) Undervoltage Detection/Overvoltage Detection Digital V and I Readback Additional Features Package Price ($U.S.)1 ADM1175 3.15 to 16.5 ON pin (UV); ON pin (OV) I2C interface with four addresses Convert pin 10-lead MSOP 2.53 ADM1176 3.15 to 16.5 ON pin (UV) I2C interface with 16 addresses — 10-lead MSOP 2.53 ADM1177 3.15 to 16.5 ON pin (UV) I2C interface with four addresses Soft start 10-lead MSOP 2.53 ADM1178 3.15 to 16.5 ON pin (UV) I2C interface with four addresses ALERTB pin 10-lead MSOP 2.73 ADM1275 New 2 to 20 UV pin, OV pin PMBus interface with four addresses Soft start, foldback, fast gate shutdown, adjustable currentsense limit 16-lead QSOP, 20-lead QSOP, 20-lead LFCSP 4.49 4.99 4.99 ADM1276 New 2 to 20 UV pin, OV pin PMBus interface with four addresses; also power readback Soft start, foldback, fast gate shutdown, adjustable currentsense limit 20-lead LFCSP 5.29 Part Number Low Voltage Positive Hot Swap Controllers Part Number Voltage Range (V) Undervoltage Detection/Overvoltage Detection Additional Features Package Price ($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 Analog Devices, Inc. Worldwide Headquarters Analog Devices, Inc. One Technology Way P.O. Box 9106 Norwood, MA 02062-9106 U.S.A. Tel: 781.329.4700 (800.262.5643, U.S.A. only) Fax: 781.461.3113 –48 V Hot Swap Controllers Part Number Voltage Range (V) Undervoltage Detection/Overvoltage Detection Digital V and I Readback Additional Features Package Price ($U.S.)1 ADM1070 Shunt regulated UV/OV pin — — 6-lead SOT-23 1.57 ADM1073 Shunt regulated UV pin, OV pin — Soft start, drain pin monitoring, additional I/Os 14-lead TSSOP 2.13 UVH pin, UVL pin, OV pin PMBus interface with four addresses; also power readback Soft start, constant power foldback, fast gate shutdown, adjustable current-sense limit 28-lead LFCSP, 28-lead TSSOP 4.99 ADM1075 New Shunt regulated Digital Power Monitors Part Number Voltage Range (V) Overcurrent Timer Digital V and I Readback Additional Features Package Price ($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 ADM4073T CM Range (V) Gain Max Sense Voltage (mV) 2 to 28 20 150 Supply Range (V) Accuracy (Typ) Package Price ($U.S.)1 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 All prices are in USD in quantities greater than 1000. 1 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). ©2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Printed in the U.S.A. B02939-1-8/12(E) www.analog.com/power Analog Devices, Inc. Europe Headquarters Analog Devices, Inc. Wilhelm-Wagenfeld-Str. 6 80807 Munich Germany Tel: 49.89.76903.0 Fax: 49.89.76903.157 Analog Devices, Inc. Japan Headquarters Analog Devices, KK New Pier Takeshiba South Tower Building 1-16-1 Kaigan, Minato-ku, Tokyo, 105-6891 Japan Tel: 813.5402.8200 Fax: 813.5402.1064 Analog Devices, Inc. Southeast Asia Headquarters Analog Devices 22/F One Corporate Avenue 222 Hu Bin Road Shanghai, 200021 China Tel: 86.21.2320.8000 Fax: 86.21.2320.8222