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LTC2954 Datasheet(PDF) 6 Page - Linear Technology |
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LTC2954 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 18 page  LTC2954 6 2954fb VIN (Pin 1/Pin 4): Power Supply Input: 2.7V to 26.4V. PB (Pin 2/Pin 3): Pushbutton 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 (Pin 5/Pin 8): Open Drain Interrupt Output. After a pushbutton turn-off event is detected (tDB,OFF),theLTC2954 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. This pin is intended to enable system power. EN is asserted 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. This pin can connect directly to a DC/DC converter shutdown pin that provides an internal pull-up. Otherwise a pull-up resistor to an external supply is required. 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). EN releases high 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. This pin can connect directly to a DC/DC converter shutdown pin that provides an internal pull-up. Otherwise a pull-up resistor to an external supply is required. 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 pushbutton must be held low before immediately releasing the EN/EN and INT outputs. Floating this pin results in a pushbutton 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. If unused, connect to a low voltage output supply (see Figure 6). Exposed Pad (Pin 9 DFN Only): Exposed Pad may be left open or connected to device ground. (TSOT-23/DFN) PIN FUNCTIONS |
Similar Part No. - LTC2954_15 |
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Similar Description - LTC2954_15 |
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