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LTC2952CF Datasheet(PDF) 1 Page - Linear Technology |
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LTC2952CF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LTC2952 1 2952f TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Push Button PowerPathTM Controller with Supervisor The LTC®2952 is a power management device that features three main functions: push-button on/off control of system power, ideal diode power paths and system monitoring. The LTC2952’s push-button input, which provides on/off control of system power, has independently adjustable ON and OFF debounce times. A simple microprocessor interface involving an interrupt signal allows for proper system housekeeping prior to power down. The ideal diode power paths provide automatic low loss switchover between two DC sources by regulating two external P-channel MOSFETs to have a small 20mV for- ward drop. High reliability systems may utilize the LTC2952’s monitor- ing features to ensure system integrity. These features in- clude: power-fail, voltage monitoring and µP watchdog. The LTC2952 operates over a wide operating voltage range to accommodate a large variety of input power supplies. The part’s combination of low 20mV external MOSFET regula- tion and very low standby current matches battery powered and power conscious application requirements. Push-Button Controller with Automatic Switchover Between Adapter and Battery , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Push-Button On/Off Control ■ Automatic Low Loss Switchover Between DC Sources ■ Wide Operating Voltage Range: 2.7V to 28V ■ Low 25µA Shutdown Current ■ Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature ■ Adjustable Push-Button On/Off Timers ■ Simple Interface Allows Graceful µP Shutdown ■ Extendable House Keeping Wait Time Prior to Shutdown ■ 200ms Reset Delay and 1.6s Watchdog Time Out ■ ±8kV HBM ESD on ⎯P⎯B Input ■ 20 pin TSSOP and QFN (4mm × 4mm) Packages ■ Desktop and Notebook Computers ■ Portable Instrumentations ■ Cell Phones, PDA and Handheld Computers ■ Servers and Computer Peripherals ■ Battery Backup Systems Ideal Diode vs Schottky Diode Forward Voltage Drop LTC2952 LT1767-2.5 SHDN VOUT VIN PFI G1 VM RST INT G1STAT PFO KILL WDE G2 V1 V2 M1 M2 PB EN VS ONT GND OFFT 2952 TA01 ADAPTER 3V TO 25V 2.5V 12V BATTERY Si6993DQ Si6993DQ µP 365k 511k 100k *68nF *OPTIONAL *22nF 100k 1k 1k 1k 10k D2 D3 D1 FORWARD VOLTAGE (V) 0.02 0.50 2952 TA01b 0 1 CONSTANT VOLTAGE SCHOTTKY DIODE IDEAL DIODE CONSTANT RON |
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