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LTC2952IFTRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC2952IFTRPBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 30 page LTC2952 1 2952fa TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Pushbutton PowerPathTM Controller with Supervisor The LTC®2952 is a power management device that features three main functions: pushbutton on/off control of system power, ideal diode PowerPath controllers and system moni- toring. The LTC2952’s pushbutton input, which provides on/off control of system power, has independently adjust- able 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 PowerPath controllers provide automatic low loss switchover between two DC sources by regulating two external P-channel MOSFETs to have a small 20mV forward 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. Pushbutton Controller with Automatic Switchover Between Adapter and Battery n Pushbutton On/Off Control n Automatic Low Loss Switchover Between DC Sources n Wide Operating Voltage Range: 2.7V to 28V n Low 25μA Shutdown Current n Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature n Adjustable Pushbutton On/Off Timers n Simple Interface Allows Graceful μP Shutdown n Extendable Housekeeping Wait Time Prior to Shutdown n 200ms Reset Delay and 1.6s Watchdog Timeout n ±8kV HBM ESD on PB Input n 20-pin TSSOP and QFN (4mm × 4mm) Packages n Desktop and Notebook Computers n Portable Instrumentations n Cell Phones, PDA and Handheld Computers n Servers and Computer Peripherals n 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 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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