LTC2954CDDB-2#TR

更新时间： 2024-02-12 14:50:56

品牌	Logo	应用领域
凌特 - Linear		电源电路电源管理电路微处理器控制器
页数	文件大小	规格书
16页	582K
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LTC2954CDDB-2#TR 数据手册

LTC2954

U U

PI FU CTIO S ^{(TSOT-23/DFN)}

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

V (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.

and held low (t

+ t ) during normal operation. The

PD, Min PDT

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 (t + t ).

DB, ON ONT

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

ONT(Pin3/Pin2):TurnOnTimeInput. Placinganexternal

capacitor to ground determines the additional time (6.4

seconds/µF)thePBpinmustbeheldlowbeforetheenable

outputisasserted. Floatingthispinresultsinadefaultturn

on debounce time of 32ms.

and held low (t

+ t ) during normal operation.

PDT

PD, Min

The operating range of this pin is 0V to 26.4V.

PDT (Pin 7/Pin 6): Power Down Time Input. A capacitor

togrounddeterminestheadditionaltime(6.4seconds/µF)

GND (Pin 4/Pin 1): Device Ground.

INT(Pin5/Pin8):OpenDrainInterruptOutput.Afterapush that the push button must be held low before immediately

button turn off event is detected (t

), the LTC2954 releasing the EN/EN and INT outputs. Floating this pin

DB,OFF

interrupts the system (µP) by asserting the INT pin low. results in a push button power down time of 64ms.

The µP would perform power down and housekeeping

KILL(Pin8/Pin5):KillInput.ForcingKILLlowreleasesthe

tasks and then assert the KILL pin low, thus releasing the

enable output. During system turn on, this pin is blanked

enable output. The INT pulse width is a minimum of 32ms

by a 512ms internal timer (t

system to pull KILL high. This pin has an accurate 0.6V

threshold and can be used as a voltage monitor input.

) to allow the

KILL, ON BLANK

and stays low as long as PB is asserted. If PB is asserted

for longer than t

+ t , the INT and EN/EN outputs

PDT

PD,Min

are immediately released.

Exposed Pad (Pin 9 DFN Only): Exposed Pad may be left

open or connected to device ground.

EN (LTC2954-1, Pin 6/Pin 7): Open Drain Enable Output.

Thispinisintendedtoenablesystempower.ENisasserted

high after a valid PB turn on event (t

+ t ). EN is

ONT

DB,ON

2954f

1...3 4 567 8 9...16

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