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

Description

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.