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.

Applications

* Desktop and Notebook Computers

* Portable Instrumentations

* Cell Phones, PDA and Handheld Computers

* Servers and Computer Peripherals

* Battery Backup Systems

* 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