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LTC4252-2 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4252-2 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LTC4223-1/LTC4223-2 1 422312f TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Dual Supply Hot Swap Controller for Advanced Mezzanine Card The LTC®4223 positive voltage Hot SwapTM controller allows a board to be safely inserted and removed from a live AMC or MicroTCA backplane. It controls the main 12V supply with an external N-channel MOSFET and the 3.3V auxiliary supply with an integrated switch. The 12V output ramp rate is adjustable and includes inrush current limiting. The 12V output is also protected against short circuit faults with a fast acting current limit and a 5% accurate timed circuit breaker. The 3.3V output includes both soft start and overcurrent protection. The LTC4223 features a current monitor output for the 12V supply, and reports fault and power-good status for both supplies. It also detects card presence and allows independent control of the 12V and auxiliary 3.3V sup- ply outputs. The LTC4223-1 features a latch-off circuit breaker, while the LTC4223-2 provides automatic retry after a fault. Advanced Mezzanine Card Application ■ Allows Safe Insertion into Live AMC or MicroTCA Backplane ■ Controls 12V Main and 3.3V Auxiliary Supplies ■ Limits Peak Fault Current in ≤1μs ■ Adjustable Current Limit with Circuit Breaker ■ Integrated 0.3Ω AUX Switch ■ High Side Current Sense ■ Gate Drive for External N-Channel MOSFET ■ Adjustable Response Time for Overcurrent Protection ■ Adjustable Supply Voltage Power-Up Rate ■ Thermal Shutdown Protection ■ LTC4223-1: Latch Off After Fault ■ LTC4223-2: Automatic Retry After Fault ■ 16-Lead SSOP and 5mm × 4mm DFN Packages ■ Advanced Mezzanine Card, MicroTCA Systems ■ Workstations and Server I/O ■ Telecom Networks , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Normal Power-Up Waveform 422312 TA01a 12VSENSE 12VGATE 12VOUT 12VIN VCC AUXIN AUXOUT EN AUXON 12ON AUXPGOOD 12PGOOD FAULT 12V 3.3V 6m Ω Si7336ADP CARRIER CONNECTOR MODULE CONNECTOR TIMER LTC4223-1/LTC4223-2 GND 12V 7.4A 3.3V 150mA 10 Ω 51 Ω 330nF 0.1 μF 47 Ω 15nF IPMC 12IMON ADC 20ms/DIV 12PGOOD 5V/DIV EN 5V/DIV AUXOUT 5V/DIV 12VOUT 5V/DIV AUXPGOOD 5V/DIV 422312 TA01b |
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