Micropower Hot Swap Controller 4µA IQ Hot Swap Controller Protects Battery Against Voltage and Current Faults The LTC4231 Hot Swap™ controller delivers a micropower solution for safe insertion and removal of boards and batteries in energy conscious applications. Device IQ (quiescent current) is a mere 4µA while a strobed ground reduces the input voltage divider current by 50x. The system is completely protected against battery deep discharge, output overload or short-circuit, overvoltage and reverse battery connection. Placing the LTC4231 in shutdown mode reduces its IQ to 0.3µA and turns off the external N-channel power MOSFETs to disconnect downstream circuits, extending battery standby time. Features nn nn nn nn 5 Low 4μA Quiescent Current, 0.3μA in Shutdown 2.7V to 36V Operating Range Reverse Battery Protection to –40V Overcurrent Protection nn nn nn nn nn IQ vs Input Voltage Enables Safe Board or Battery Insertion and Removal Two Level: Circuit Breaker with Higher Current Limit Adjustable Circuit Breaker Delay 1µs (max) Fast Current Limit Response Automatic Retry or Latchoff After Current Fault Overvoltage and Undervoltage Protection Adjustable Undervoltage Hysteresis Divider Strobed Ground for Reduced Current Controls Single or Back-to-Back N-Channel MOSFETs NORMAL ON 4 IQ (µA) nn 3 2 nn nn nn nn nn MOSFET On Status Output 12-Pin MSOP and 3mm × 3mm QFN Packages 1 SHUTDOWN 0 0 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 10 20 VIN (V) 30 40 Micropower Devices for Building Battery Powered Systems LTC2955 Pushbutton On/Off Controller with Automatic Turn-On nn nn nn nn nn nn nn Automatic Turn-On with Voltage Monitor Input 1.2μA Quiescent Current 1.5V to 36V Operating Range PB Input: ±36V Range, ±25kV ESD HBM Simple Interface Allows Graceful μP Shutdown Adjustable Turn-Off Timer 10-Pin 3mm × 2mm DFN and 8-Pin ThinSOT™ Packages LTC4231 CIRCUIT LTC2955-1 VIN INT TO LTC4231 SHDN EN KILL FROM LTC4231 STATUS TIMER PB ON GND LTC2960 Nano-Current Two Input Voltage Supervisor for Reset Generation nn nn nn nn nn nn nn 850nA Quiescent Current 2.5V to 36V Operating Range ±1.5% (Max) Threshold Accuracy Adjustable Reset Threshold Manual Reset Input −40°C to 125°C Operation 8-Pin TSOT-23 and 2mm x 2mm DFN Packages LTC4231 CIRCUIT DC/DC VCC ADJ IN+/IN– LTC2960 MR BATTERY POWERED SYSTEM LOW BAT RESET GND LTC4359 Ideal Diode Controller for Lossless Solar Panel Isolation nn nn nn nn nn nn nn Low Loss Replacement for Power Schottky Diode 150μA Quiescent Current, 9μA in Shutdown 4V to 80V Operating Range On/Off Control of Forward Path Reverse Input Protection to –40V –40°C to 125°C Operation 8-Pin MSOP and 6-Pin 2mm x 3mm DFN Packages LTC4231 CIRCUIT IN SOURCE GATE OUT SOLAR PANEL SHUNT REGULATOR SHDN LTC4359 VSS Other Battery Friendly Devices Device VIN (V) VIN,REV (V) IQ (µA) ISHDN (µA) 1.5 Overcurrent and 80V Overvoltage Protection LTC4364 4 to 80 −40 483 10 Surge Stopper/Hot Swap with Ideal Diode MSOP-16, SO-16, 4 x 3 DFN-14 LTC4365 2.5 to 34 −40 125 10 OV, UV and Reverse Input Protection TSOT23-8, 3 x 2 DFN-8 LTC4417 2.5 to 36 −42 28 15 Prioritized Supply Selection from Three Inputs SSOP-24, 4 x 4 QFN-24 LTC4361 2.5 to 5.5 PFET 230 Function Package (mm × mm) TSOT23-8, 2 x 2 DFN-8 www.linear.com/4231 n 1-800-4-LINEAR 0714