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LTC4413 Datasheet(PDF) 1 Page - Analog Devices |
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LTC4413 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 32 page  LTC4421 1 Rev. 0 For more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION High Power Prioritized PowerPath Controller The LTC®4421 connects one of two input supplies to a common output based on user-defined priority and valid- ity. By definition, the supply connected to V1 is the higher priority supply, although this can be changed dynamically. External resistive dividers set the undervoltage and over- voltage thresholds that bound the valid voltage window. Strong gate drivers switch the large external N-channel MOSFETs quickly. Fast switchover circuitry minimizes output droop when changing channels while preventing reverse and cross conduction. A fast comparator detects input short circuits and quickly turns off the N-channel MOSFETs to minimize disruption. External sense resistors set the maximum inrush and cur- rent limit currents. During current limiting, the LTC4421 controls the N-channel MOSFET gate to regulate 25mV across the sense resistor. When the sense resistor voltage has been regulated to 25mV for a user-settable time, the channel is disconnected and a fault is set. APPLICATIONS n 0V to 36V Wide Operating Range (60V Tolerant) n Drives Large External N-Channel MOSFETs for High Output Current Applications n Accurately Limits Inrush Current n Connects Highest Priority Valid Supply to Output Load n Changes Channel Priority in Real Time n ±2% OV, UV Input Comparators n Individually Adjustable Current Limit Time-Out for Each Channel n Adjustable Input Validation Time n Fast Switchover Minimizes VOUT Droop n 36-Lead 5mm × 6mm QFN and SSOP Packages n High Reliability Systems n Server Based Back-Up Systems n Industrial Handheld Instruments n Battery Back-Up Systems All registered trademarks and trademarks are the property of their respective owners. 4421 TA01 35.7k 12.7k 20k 1M 16.5k 3.92k 8.06k 1M 0.1µF 1µF 1.21 1µF 47nF 1µF 47nF 470pF 220µF 2.5m 2.5m GATE1 SOURCE1 OUT2 GATE2 SOURCE2 V1 EXTVCC INTVCC TMR1 OV1 OV2 V2 CPO SENSE1 SENSE2 VALID1 VALID2 GND FAULT1 FAULT2 CH1 CH2 DISABLE1 DISABLE2 SHDN UVF1 UVF2 UVR1 UVR2 OUT1 TMR2 CASIN CASOUT QUAL RETRY CPOREF 47nF 47nF PRIMARY ILIM1 = 10A ILIM2 = 10A 12V VOUT SECONDARY 28V LTC4421 DIGITAL STATUS OUTPUTS DIGITAL CONTROL INPUTS UV1FALLING = 7.81V UV1RISING = 11.04V OV1RISING = 14.96V UV2FALLING = 18.1V UV2RISING = 25.2V OV2RISING = 31.2V 2.8 1µF |
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