Low Voltage Hot Swap Controllers
Analog Devices’ low voltage hot swap ICs feature operating voltages down to 0 V. With features such as multilevel overcurrent protection, low quiescent current operation, precision circuit breaker, current monitoring output, internal (10 A and 20 A with guaranteed SOA) or external MOSFETs, an integrated ADC with an I2C interface, SOA sharing dual current paths, ideal diode control, supply sequencing, or tracking in multiple-supply applications, these controllers offer a compact and robust solution for board or blade insertion into live backplanes of either proprietary or standards-based (MicroTCA, AMC) chassis.
Product Selection Table
Latest Resources
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LT Journal
- 12V/100A Hot Swap Design for Server Farms PDF
- Protect Mobile Devices from Hot Plug Transients (to 85V) and from Users Who Use the Wrong Power Adapter PDF
- June 2009 - Compact No RSENSE Controllers Feature Fast Transient Response and Regulate to Low VOUT from Wide Ranging VIN PDF
- Jan 2009 -Dual Hot Swap Controller Brings Digital Monitoring to AdvancedTCA, µTCA and AMC Applications PDF
- June 2009 - Improve Hot Swap Performance and Save Design Time with Hot Swap Controller that Integrates 2A MOSFET and Sense Resistor PDF
- September 2008 - Dual Hot Swap Controller in 3mm × 2mm DFN is Perfect for Backplane or Card Resident 1V–6V Applications PDF
- Mar 2008 - Compact Hot Swap Solution Simplifies Advanced Mezzanine Card Design PDF
- Dec 2003 Hot Swap Controller with Power-Up Timeout Function Simplifies Hot Swapping Boards with Multiple Power Supplies PDF
- May 2001 Ramp Three Supplies with a Supply Monitor and Hot Swap Controller PDF
- June 2006 Hot Swap Controller Monitors and Reports Power Supply Status PDF
- May 2005 - Small DFN Electronic Circuit Breaker Eliminates Sense Resistor PDF
- Dec 2003 Hot Swap Controller Enforces Tracking in Split Supply Systems PDF
- Sep 2003 CompactPCI Hot Swap Controller with I2C Interface, Bus Precharge and On-Chip LOCAL_PCI_RESET# Logic PDF
- Sep 2003 Using Current Sensing Resistors with Hot Swap Controllers and Current Mode Voltage Regulators PDF
- Dec 2001 CompactPCI Hot Swap Controllers with Bus Precharge, On-Chip Intercept of PCI Reset Signal and Much More PDF
- May 2001 Hot Swap Circuit Gets InfiniBand Power onto your Module PDF
- Feb 2000 LTC1645/LTC1735 Circuit Solves PCI Power Problem PDF
- Nov 1999 LTC1642: a Hot Swap Controller with Foldback Current Limiting and Overvoltage Protection PDF
- Nov 1999 Versatile Dual Hot Swap Controller/Power Sequencer Allows Live Backplane Insertion PDF
- Aug 1998 Hot Swapping the PCI Bus Using the LTC1643 PDF
- MOSFET Safe Operating Area and Hot Swap Circuits
Technical Articles
- LTspice: SOAtherm Support for PCB and Heat Sink Thermal Models
- LTspice: Models of ISO 7637-2 & ISO 16750-2 Transients
- LTC4218 12V/100A Hot Swap Design for Server Farms
- Achieving Low On-Resistance with Guaranteed SOA in High Current Hot Swap Applications
- LTC4226 Parallel MOSFETs in Hot Swap Circuits
- Understanding Power Monitor Accuracy
- LTspice: Modeling Safe Operating Area Behavior of N-channel MOSFETs
Design Notes
- DN272 - Multiple Power Supplies Track During Power Up PDF
- DN360 - Protecting and Monitoring Hot Swappable Cards in High Availability Systems PDF
- DN346 - PCI Express Power and Mini Card Solutions PDF
- DN319 - Low Voltage Hot Swap Controller Ignores Backplane Noise and Surges PDF
- DN265 - Hot Swap Circuit Meets InfiniBand Specification PDF
- DN253 - LTC1646: Power Supply Isolation Controller Simplifies Hot Swapping the CompactPCI Bus for 5V-/3.3V-Only Applications PDF
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DN217 - LTC1645 Dual Channel Hot Swap Controller/Power Sequencer
Allows Insertion Into a Live Backplane PDF - DN197 - Power Solutions for the Device Bay PDF
- DN155 - Hot Swapping the PCI Bus PDF
- DN139 - Safe Hot Swapping Using the LTC1421 PDF
- DN466 - Hot Swap Controller, MOSFET and Sense Resistor Are Integrated in a 5mm × 3mm DFN for Accurate Current Limit and Load Current Monitoring in Tight Spaces PDF
- DN421 - An Easy Way to Add Auxiliary Control Functions to Hot Swap Cards PDF
- DN437 - Hot Swap Solution Meets AMC and MicroTCA Standards PDF
- DN402 - Electronic Circuit Breaker in Small DFN Package Eliminates Sense Resistor PDF
- Design Solutions 12 - Design Guidelines for CompactPCI Hot Swap Control Applications Using the LTC1644 PDF
Low Voltage Hot Swap Controllers
| SortOrder | Part# | Circuit Breakers | Vin Range | Circuit Breaker Threshold | Circuit Breaker Accuracy (typ) (%) | Isupply (typ) (A) | Features | Comments | Price (1000+) ($ US) |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ADM1278 | 1 | 4.5V to 20V | 4mV to 24mV | 2.7 | 4.7m | 12-bit ADC, Digital Interface, PMBus | Hot Swap Controller and Digital Power and Energy Monitor with PMBus Interface | $2.89 (ADM1278-1BCPZ) |
| 2 | LTC4281 | 1 | 2.9V to 33V | 12.5mV to 34.37mV | 2 | 3.5m | 12-bit ADC, 16-bit ADC, Digital Interface, EEPROM | Hot Swap Controller with I2C Compatible Monitoring | $5.33 (LTC4281CUFD#PBF) |
| 3 | LTC4236 | 1 | 2.9V to 18V | 25mV | 10 | 2.7m | Current Monitor Output, Ideal Diode | Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor | $4.25 (LTC4236CUFD-1#PBF) |
| 4 | LTC4282 | 1 | 2.9V to 33V | 12.5mV to 34.37mV | 2 | 3.5m | 12-bit ADC, 16-bit ADC, Digital Interface, EEPROM, SOA Sharing | High Current Hot Swap Controller with I2C Compatible Monitoring | $5.95 (LTC4282CUH#PBF) |
| 5 | LTC4233 | 1 | 2.9V to 15V | 11.2A | 11 | 1.6m | Current Monitor Output, Guaranteed SOA, Integrated FET, Integrated Rsense | 10A Guaranteed SOA Hot Swap Controller | $3.95 (LTC4233CWHH#PBF) |
| 6 | LTC4234 | 1 | 2.9V to 15V | 22.5A | 11 | 1.6m | Current Monitor Output, Guaranteed SOA, Integrated FET, Integrated Rsense | 20A Guaranteed SOA Hot Swap Controller | $4.95 (LTC4234CWHH#PBF) |
| 7 | LTC4235 | 1 | 9V to 14V | 25mV | 10 | 2.7m | Current Monitor Output, Ideal Diode | Dual 12V Ideal Diode-OR and Single Hot Swap Controller with Current Monitor | $3.95 (LTC4235CUFD-1#PBF) |
| 8 | LTC4231 | 1 | 2.7V to 36V | 50mV | 6 | 4µ | Low Iq | Low Iq Hot Swap Controller, -1 remains off after fault, -2 automatic retry | $2.25 (LTC4231CMS-1#PBF) |
| 9 | LTC4232-1 | 1 | 2.9V to 15V | 5.6A | 10 | 1.6m | Current Monitor Output, Integrated FET, Integrated Rsense | 5A Integrated Hot Swap Controller, PCI Express Compliant | $3.35 (LTC4232CDHC-1#PBF) |
| 10 | LTC4229 | 1 | 2.9V to 18V | 25mV | 10 | 2m | Ideal Diode | Ideal Diode and Hot Swap Controller | $2.95 (LTC4229CG#PBF) |
| 11 | LTC4226 | 2 | 4.5V to 44V | 50mV | 10 | 700µ | - | Wide Operating Range Dual Hot Swap Controller | $3.10 (LTC4226CMS-1#PBF) |
| 12 | LTC4228 | 2 | 2.9V to 18V | 50mV | 5 | 2.5m | Ideal Diode | Dual ideal diode and hot swap controller, -1 Latchoff, -2 Auto-Retry | $3.59 (LTC4228CGN-1#PBF) |
| 13 | LTC4232 | 1 | 2.9V to 15V | 5.6A | 10 | 1.6m | Current Monitor Output, Integrated FET, Integrated Rsense | 5A Integrated Hot Swap Controller | $3.35 (LTC4232CDHC#PBF) |
| 14 | LTC4227 | 1 | 2.9V to 18V | 50mV | 5 | 2m | Ideal Diode | Dual ideal diode-OR and single hot swap controller, Options for latchoff/auto-Retry and 100ms/1.6ms | $3.41 (LTC4227CGN-1#PBF) |
| 15 | ADM1276 | 1 | 2V to 20V | 4mV to 24mV | 3.5 | 3.2m | 12-bit ADC, Digital Interface, PMBus | Hot Swap Controller and Digital Power and Energy Monitoringwith PMBus Interface | $5.29 (ADM1276-3ACPZ) |
| 16 | ADM1275 | 1 | 2V to 20V | 4mV to 24mV | 3.5 | 3.2m | 12-bit ADC, Digital Interface, PMBus | Hot Swap Controller and Digital Power Monitor with PMBus Interface | $4.49 (ADM1275-2ARQZ) |
| 17 | LTC4219 | 1 | 2.9 to 15 (5V or 12V presets) | 5.6A | 10 | 1.6m | Current Monitor Output, Integrated FET, Integrated Rsense | 5A Integrated Hot Swap Controller | $3.35 (LTC4219CDHC-12#PBF) |
| 18 | LTC4362 | 1 | 2.5V to 5.5V | 1.5A | 20 | 220µ | Integrated FET, Integrated Rsense | 5.8V OV threshold, Internal FET and sense resistor, 28V Protection, Reverse input PFET driver, -1 La | $1.60 (LTC4362CDCB-1#TRPBF) |
| 19 | LTC4280 | 1 | 2.9V to 15V | 25mV | 10 | 3m | 8-bit ADC, Digital Interface | Hot Swap Controller with I2C Compatible Monitoring | $3.95 (LTC4280CUFD#PBF) |
| 20 | LTC4361 | 1 | 2.5V to 5.5V | 50mV | 10 | 220µ | - | 5.8V OV threshold, 50mV overcurrent threshold, 80V protection, Reverse input PFET driver, -1 Latchof | $1.40 (LTC4361CDC-1#TRPBF) |
| 21 | LTC4222 | 2 | 2.9V to 29V | 50mV | 5 | 3m | 10-bit ADC, Digital Interface | Dual Hot Swap Controller with I2C Compatible Monitoring | $5.85 (LTC4222CG#PBF) |
| 22 | LTC4224 | 2 | 1V to 6V | 25mV | 10 | 1.4m | - | Compact Dual Low Voltage Hot Swap Controller | $2.40 (LTC4224CDDB-1#TRPBF) |
| 23 | LTC4217 | 1 | 2.9V to 26.5V | 2A | 7.5 | 1.6m | Current Monitor Output, Integrated FET, Integrated Rsense | 2A Integrated Hot Swap Controller | $3.35 (LTC4217CDHC#PBF) |
| 24 | LTC4223 | 2 | 12, 3.3 aux | 50mV (12), 240mA (3.3 aux) | 5 | 800µ | Current Monitor Output | Dual Supply Hot Swap Controller for Advanced Mezzanine Card | $1.95 (LTC4223CDHD-1#PBF) |
| 25 | LTC4218 | 1 | 2.9V to 26.5V | 15mV | 5 | 1.6m | Current Monitor Output | Hot Swap Controller | $2.65 (LTC4218CDHC-12#PBF) |
| 26 | LTC4215-1/-3 | 1 | 2.9V to 15V | 25mV | 10 | 3m | 8-bit ADC, Digital Interface | I2C, 8-Bit ADC measures current & voltage, 3 GPIO, 20µs/420µs circuit breaker timeout | $3.95 (LTC4215CUFD-3#PBF) |
| 27 | ADM1178 | 1 | 3.15V to 16.5V | 100mV | 3 | 1.7m | 12-bit ADC, Digital Interface | Hot Swap Controller and Digital Power Monitor with ALERTB Output | $2.81 (ADM1178-1ARMZ-R7) |
| 28 | ADM1177 | 1 | 3.15V to 16.5V | 100mV | 3 | 1.7m | 12-bit ADC, Digital Interface | Hot Swap Controller and Digital Power Monitor with Soft Start Pin | $2.61 (ADM1177-1ARMZ-R7) |
| 29 | ADM1176 | 1 | 3.15V to 16.5V | 100mV | 3 | 1.7m | 12-bit ADC, Digital Interface | Hot Swap Controller and I2C® Power Monitor | $2.61 (ADM1176-1ARMZ-R7) |
| 30 | ADM1175 | 1 | 3.15V to 16.5V | 100mV | 3 | 1.7m | 12-bit ADC, Digital Interface | Hot Swap Controller and Digital Power Monitor with Convert Pin | $2.61 (ADM1175-1ARMZ-R7) |
| 31 | ADM4210 | 1 | 2.7V to 16.5V | 50mV | 12 | 650m | - | Low Voltage Hot Swap Controller in 6-pin TSOT Package | $2.05 (ADM4210-1AUJZ-RL7) |
| 32 | ADM1172 | 1 | 2.7 to 16.5 | 50mV | 12 | 650m | - | 2.7 V to 16.5 V Hot Swap Controller with Power-Good Comparator | $2.08 (ADM1172-1AUJZ-RL7) |
| 33 | ADM1171 | 1 | 2.7 to 16.5 | 50mV | 12 | 650m | Current Monitor | 2.7 V to 16 V Hot Swap Controller with Current Sense Output | $2.30 (ADM1171-1AUJZ-RL7) |
| 34 | ADM1170 | 1 | 1.6V to 16.5V | 50mV | 12 | 650m | - | 1.6 V to 16.5 V Hot Swap Controller | $2.19 (ADM1170-1AUJZ-RL7) |
| 35 | LTC1642A | 1 | 2.97V to 16.5V | 52.5mV | 20 | 1.25m | - | Protected against surges to 33V, output driver for SCR | $3.50 (LTC1642ACGN#PBF) |
| 36 | LTC4213 | 1 | 0V to 6V | 25mV, 50mV, 100mV | 10 | 1.6m | No Rsense | No RSENSE Electronic Circuit Breaker | $1.56 (LTC4213CDDB#TRPBF) |
| 37 | LTC4216 | 1 | 0V to 6V | 25mV | 14 | 1.6m | - | 0V to 6V load voltages, active current limiting on in-rush, 2.3V to 6V bias voltage required, timer | $1.85 (LTC4216CMS#PBF) |
| 38 | LTC4215/-2 | 1 | 2.9V to 15V | 25mV | 10 | 3m | 8-bit ADC, Digital Interface | I2C, 8-Bit ADC measures current & voltage, 1 GPIO, 20µs/420µs circuit breaker timeout | $3.75 (LTC4215CGN#PBF) |
| 39 | LTC4221 | 2 | (1) 1 to 13.5 (1) 2.7 to 13.5 | 25mV | 18 | 2.2m | - | Dual Hot Swap Controller/Power Sequencer with Dual Speed, Dual Level Fault Protection | $3.10 (LTC4221CGN#PBF) |
| 40 | LTC4244 | 4 | ±12, 3.3, 5 | 52mV | 14 | 4m | - | Rugged CompactPCI bus hot swap controllers, -1 option for applications without –12V | $3.90 (LTC4244CGN#PBF) |
| 41 | LTC4240 | 4 | ±12, 3.3, 5 | 55mV | 9 | 3m | Digital Interface | Controls 3.3V,5V with N-Channel FETs, ±12V supplies controlled with internal switches. I2C compatibl | $4.25 (LTC4240CGN#PBF) |
| 42 | LT4220 | 2 | ±2.7V to ±16.5V | 48mV, -52mV | 17 | 2.7m | - | Controls positive and negative voltages. Selectable tracking mode | $3.50 (LT4220CGN#PBF) |
| 43 | LTC4212 | 1 | 2.5V to 16.5V | 50mV | 20 | 1m | - | Power Good Input with Timer and Glitch Filter for assuring proper powering-up and monitoring of DC/D | $2.55 (LTC4212CMS#PBF) |
| 44 | LTC4241 | 5 | ±12, 3.3, 3.3 aux, 5 | 55mV (3.3,5), 850mA (12), 450mA (-12) | 27 | 2.5m | - | Controls 3.3V,5V, and 3.3V Aux with N-Channel FETs, ±12V supplies controlled with internal switches. | $1.75 (LTC4241CGN#PBF) |
| 45 | LTC4210 | 1 | 2.7V to 16.5V | 50mV | 12 | 650µ | - | Active current limiting with circuit breaker, -1 Auto-Retry, -2 Latchoff | $1.71 (LTC4210-1CS6#TRPBF) |
| 46 | LTC1643A | 4 | ±12V, 3.3, 5 | 53mV (5, 3.3), 850mA (12), 450mA (-12) | 24.5 | 3.5m | - | Controls 3.3V and 5V with N-Channel FETs, ±12V supplies controlled with internal switches for PCI an | $4.25 (LTC1643AHCGN#PBF) |
| 47 | LTC4214 | 1 | 0V to -16V | 50mV | 12 | 800µ | - | Multilevel current limiting, Controls -5V supplies if positive supply is available. -1 Latchoff, -2 | $2.35 (LTC4214-1CMS#PBF) |
| 48 | LTC4230 | 3 | (1) 1.7 to 15.5, (1) 2.375 to 16.5, (1) 2.7 to 16.5 | 50mV | 20 | 1.8m | - | Controls three supplies. active current limiting on in-rush, timed circuit breaker or fast response | $3.65 (LTC4230CGN#PBF) |
| 49 | LTC1644 | 4 | ±12V, 3.3, 5 | 55mV | 27 | 3m | - | 3.3V, 5V and ±12V supplies for CompactPCI, LOCAL_PCI_RST# logic, 1V precharge for data bus | $3.60 (LTC1644CGN#PBF) |
| 50 | LTC4211 | 1 | 2.5V to 16.5V | 50mV | 20 | 1m | - | Active current limiting on in-rush, timed circuit breaker or fast response to catastrophic faults | $1.95 (LTC4211CS8#PBF) |
| 51 | LTC1647 | 2 | 2.7V to 16.5V | 50mV | 20 | 1m | - | Dual hot swap controller, Options for separate or combined VCC, ON, FAULT pins | $2.95 (LTC1647-1CS8#PBF) |
| 52 | LTC1646 | 2 | 2.7V to 7V | 56mV | 16 | 1.5m | - | 3.3V and 5V supplies for CompactPCI, LOCAL_PCI_RST# logic, 1V precharge for data bus | $3.40 (LTC1646CGN#PBF) |
| 53 | LTC1645 | 2 | (1) 1.18 to 13.2, (1) 2.3 to 13.2 | 50mV | 12 | 1.1m | - | Power Supply Sequencing, Reset, Fault outputs and spare comparator in 14-pin version | $2.95 (LTC1645CS8#PBF) |
| 54 | LTC1642 | 1 | 2.97V to 16.5V | 52.5mV | 20 | 1.25m | - | Protected against surges to 33V, output driver for SCR | $3.50 (LTC1642CGN#PBF) |
| 55 | LTC1422 | 1 | 2.55V to 13.2V | 50mV | 28 | 650µ | - | System reset, programmable current limit | $2.50 (LTC1422CN8#PBF) |
| 56 | LTC1421 | 2 | (1) -5 to -12, (2) 2.6 to 13.2 | 50mV | 20 | 1.5m | - | Trip point of the ground sense comparator is set at 0.1V or 2.5V (LTC1421-2.5) | $4.90 (LTC1421CSW#PBF) |
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