Datasheet > LTC2954CDDB-2#TRPBF

LTC2954CDDB-2#TRPBF

更新时间： 2024-02-16 02:22:08

品牌	Logo	应用领域
凌特 - Linear		光电二极管
页数	文件大小	规格书
18页	454K
描述
LTC2954 - Push Button On/Off Controller with µP Interrupt; Package: DFN; Pins: 8; Temperature Range: 0°C to 70°C

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技术参数
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LTC2954CDDB-2#TRPBF 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	HVSON,
针数：	8	Reach Compliance Code：	compliant
风险等级：	5.11	可调阈值：	YES
模拟集成电路 - 其他类型：	POWER SUPPLY SUPPORT CIRCUIT	JESD-30 代码：	R-PDSO-N8
JESD-609代码：	e3	长度：	3 mm
湿度敏感等级：	1	信道数量：	1
功能数量：	1	端子数量：	8
最高工作温度：	70 °C	最低工作温度：
封装主体材料：	PLASTIC/EPOXY	封装代码：	HVSON
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：	260	认证状态：	Not Qualified
座面最大高度：	0.8 mm	最大供电电压 (Vsup)：	26.4 V
最小供电电压 (Vsup)：	2.7 V	表面贴装：	YES
技术：	CMOS	温度等级：	COMMERCIAL
端子面层：	Matte Tin (Sn)	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	30	宽度：	2 mm
Base Number Matches：	1

LTC2954CDDB-2#TRPBF 数据手册

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LTC2954

PIN FUNCTIONS ^{(TSOT-23/DFN)}

V (Pin 1/Pin 4): Power Supply Input: 2.7V to 26.4V.

andheldlow(t

+t )duringnormaloperation.This

PD,MIN PDT

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 1V to 26.4V.

PB (Pin 2/Pin 3): Pushbutton Input. Connecting PB to

ground through a momentary switch provides on/off

control via the ꢀN/EN and INT outputs. An internal ±11k

pull-up resistor connects to an internal ±.9V bias voltage.

The rugged PB input withstands ±±1kV ꢀSD HBM and

can be pulled up to 26.4V externally without consuming

extra current.

EN (LTC2954-2, Pin 6/Pin 7): Open Drain ꢀnable 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

5±2ms of the initial valid PB power turn-on event, b) KILL

is driven low during normal operation, c) PB is pressed

ONT(Pin3/Pin2):Turn-OnTimeInput.Placinganexternal

capacitor to ground determines the additional time (6.4

seconds/μF)thePBpinmustbeheldlowbeforetheenable

output is asserted. Floating this pin results in a default

turn on debounce time of 32ms.

andheldlow(t

+t )duringnormaloperation.This

PD,MIN PDT

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 1V to 26.4V.

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

INT (Pin 5/Pin 8): Open Drain Interrupt Output. After a

pushbuttonturn-offeventisdetected(t

),theLTC2954

DB,OFF

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

togrounddeterminestheadditionaltime(6.4seconds/μF)

that the pushbutton must be held low before immediately

releasing the ꢀN/EN and INT outputs. Floating this pin

results in a pushbutton power-down time of 64ms.

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

KILL(Pin8/Pin5):KillInput.ForcingKILLlowreleasesthe

for longer than t

+ t , the INT and ꢀN/EN outputs

PD,MIN

are immediately released.

PDT

enableoutput.Duringsystemturn-on,thispinisblankedby

a5±2msinternaltimer(t

)toallowthesystem

KILL,ONBLANK

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

to pull KILL high. This pin has an accurate 1.6V threshold

and can be used as a voltage monitor input. If unused,

connect to a low voltage output supply (see Figure 6).

Thispinisintendedtoenablesystempower.ꢀNisasserted

high after a valid PB turn-on event (t

+ t ). ꢀN is

DB,ON

ONT

released low if: a) KILL is not driven high (by μP) within

5±2ms of the initial valid PB power turn-on event, b) KILL

is driven low during normal operation, c) PB is pressed

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

open or connected to device ground.

2954fb

1...3 4 567 8 9...18

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LTC2954CTS8-1#TRMPBF	Linear	LTC2954 - Push Button On/Off Controller with µP Interrupt; Package: SOT; Pins: 8;	获取价格
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