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LTC2954 Datasheet(PDF) 6 Page - Linear Technology |
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LTC2954 Datasheet(HTML) 6 Page - Linear Technology |
6 / 16 page LTC2954 6 2954f VIN (Pin 1/Pin 4): Power Supply Input: 2.7V to 26.4V. PB (Pin 2/Pin 3): Push Button Input. Connecting PB to ground through a momentary switch provides On/Off control via the EN/EN and INT outputs. An internal 100k pull-up resistor connects to an internal 1.9V bias voltage. The rugged PB input withstands ±10kV ESD HBM and can be pulled up to 26.4V externally without consuming extra current. ONT (Pin 3/Pin 2): Turn On Time Input. Placing an external capacitor to ground determines the additional time (6.4 seconds/µF) the PB pin must be held low before the enable output is asserted. Floating this pin results in a default turn on debounce time of 32ms. GND (Pin 4/Pin 1): Device Ground. INT(Pin5/Pin8):OpenDrainInterruptOutput.Afterapush button turn off event is detected (tDB,OFF), the LTC2954 interrupts the system (µP) by asserting the INT pin low. The µP would perform power down and housekeeping tasks and then assert the KILL pin low, thus releasing the enable output. The INT pulse width is a minimum of 32ms and stays low as long as PB is asserted. If PB is asserted for longer than tPD,Min + tPDT, the INT and EN/EN outputs are immediately released. EN (LTC2954-1, Pin 6/Pin 7): Open Drain Enable Output. Thispinisintendedtoenablesystempower.ENisasserted high after a valid PB turn on event (tDB,ON + tONT). EN is released low if: a) KILL is not driven high (by μP) within 512ms of the initial valid PB power turn-on event, b) KILL is driven low during normal operation, c) PB is pressed and held low (tPD,Min + tPDT) during normal operation. The operating range for this low leakage pin is 0V to 26.4V. EN (LTC2954-2, Pin 6/Pin 7): Open Drain Enable Bar Output. This pin is intended to enable system power. EN is asserted low after a valid PB turn-on event (tDB,ON + tONT). ENreleaseshighif:a)KILLisnotdrivenhigh(byμP)within 512ms of the initial valid PB power turn-on event, b) KILL is driven low during normal operation, c) PB is pressed and held low (tPD, Min + tPDT) during normal operation. The operating range of this pin is 0V to 26.4V. PDT (Pin 7/Pin 6): Power Down Time Input. A capacitor to ground determines the additional time (6.4 seconds/µF) that the push button must be held low before immediately releasing the EN/EN and INT outputs. Floating this pin results in a push button power down time of 64ms. KILL (Pin 8/Pin 5): Kill Input. Forcing KILL low releases the enable output. During system turn on, this pin is blanked by a 512ms internal timer (tKILL, ON BLANK) to allow the system to pull KILL high. This pin has an accurate 0.6V threshold and can be used as a voltage monitor input. Exposed Pad (Pin 9 DFN Only): Exposed Pad may be left open or connected to device ground. (TSOT-23/DFN) PI FU CTIO S |
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Similar Description - LTC2954 |
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