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LTC2952 - Pushbutton PowerPath Controller with Supervisor

The LTC2952 is a power management device that features three main functions: pushbutton on/off control of system power, ideal diode PowerPath controllers and system monitoring. The LTC2952’s pushbutton 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 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 monitoring features to ensure system integrity. These features include: 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 regulation and very low standby current matches battery powered and power conscious application requirements.

Features Pushbutton 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 Pushbutton On/Off Timers Simple Interface Allows Graceful μP Shutdown Extendable Housekeeping Wait Time Prior to Shutdown 200ms Reset Delay and 1.6s Watchdog Timeout ±8kV HBM ESD on PB Input 20-pin TSSOP and QFN (4mm × 4mm) Packages Typical Application

Applications Desktop and Notebook Computers Portable Instrumentations Cell Phones, PDA and Handheld Computers Servers and Computer Peripherals Battery Backup Systems Packaging

Demo Boards