Datasheet > LTC2954CDDB-2#TRPBF

LTC2954CDDB-2#TRPBF

更新时间： 2024-02-21 07:57:08

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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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

APPLICATIONS INFORMATION

Description

maximum time required to power up the DC/DC converter

and the μP. If KILL is not brought high during this 5±2ms

time window, the enable output is released. The assump-

tion is that 5±2ms is sufficient time for the system to

power up.

TheLTC2954isapushbuttonon/offcontrollerthatprovides

control of system power via a pushbutton interface. An

enable output toggles system power while an interrupt

output provides debounced pushbutton status. The inter-

rupt output can be used in menu driven applications to

request a system power-down. A power kill input allows

a microprocessor or system to release the enable output,

effectively powering down the system. Independently ad-

justable on and off timers allow dependable pushbutton

control of the enable output and resistance to accidental

toggling of system power.

Turn Off

To initiate a power-down sequence, assert the INT output

low by pressing the pushbutton for a minimum of 32ms

). The interrupt signal serves as a power-down

DB,OFF

request to the μP. The μP would then perform power-down

and housekeeping tasks and assert KILL low when done.

This in turn releases the enable output, thus shutting off

system power.

The length of time the pushbutton input (PB) must be held

low in order to toggle the enable (ꢀN/EN) output on and

off is independently adjustable with external capacitors

at the ONT/PDT pins, respectively. During normal opera-

tion, the interrupt output (INT) is asserted 32ms after PB

goes low. INT then tracks PB until either PB or ꢀN/EN is

released. See Timing Diagrams on page 8.

Adjustable Power-Down Timer

The LTC2954 provides a failsafe feature that allows the

user to turn off system power (via PB) under system fault

conditions. For cases when the μP fails to respond to the

interrupt signal, the user can force an immediate power-

down by pressing and holding down the pushbutton. The

length of time that PB must be held low is given by a fixed

The KILL input is used to immediately release the enable

output. During a normal power-down sequence, INT re-

quests a system power-down. The μP then performs its

housekeeping tasks and then sets KILL low. If the μP fails

to set KILL low, the user can force a system shutdown by

pressing and holding the pushbutton until the PDT timer

expires.

internal 64ms delay (t

) plus an adjustable power-

PD,MIN

down timer delay (t , see Timing Diagrams on page 8).

PDT

The adjustable delay is set by placing an optional external

capacitor on the PDT pin. Use the following equation to

calculate the capacitance for the desired delay. C

PDT external capacitor (μF):

is the

PDT

Turn On

-4

= ±.56 × ±1 [μF/ms] • (t

– ±ms)

PDT

When power is first applied to the LTC2954, the part ini-

tializes the output pins. Any DC/DC converters connected

to the ꢀN/EN pin will therefore be held off. To assert the

enable output, PB must be held low for a minimum of

Simplified Power On/Off Sequence

Figure ± shows a simplified LTC2954-± power-on and

power-off sequence. A high to low transition on PB (t )

32ms (t , ). The LTC2954 provides additional turn-on

DB ON

initiates the power on sequence. In order to assert the

enable output, the PB pin must stay low continuously (PB

high resets timers) for a time controlled by the default

debounce time (t ) via an optional capacitor connected

ONT

to the ONT pin. The following equation describes the ad-

ditional time that PB must be held low before asserting the

32ms and the external ONT capacitor (t –t ). Once ꢀN

enable output. C

is the ONT external capacitor (μF):

ONT

–4

goeshigh(t ), aninternal5±2msblankingtimerisstarted.

ONT

= ±.56 × ±1 [μF/ms] • (t

– ±ms)

ONT

This blanking timer is designed to give sufficient time for

the DC/DC converter to reach its final voltage, and to allow

the μP enough time to perform power-on tasks.

Once the enable output is asserted, any DC/DC converters

connected to this pin are turned on. The KILL input from

the μP is ignored during a succeeding 5±2ms blanking

The KILL pin must be pulled high within 5±2ms of the ꢀN

time (t

). This blanking time represents the

KILL,ON BLANK

pin going high. Failure to do so results in the ꢀN pin going

2954fb

1...6 7 8910 11 12...18

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与LTC2954CDDB-2#TRPBF相关器件

型号	品牌	描述	获取价格	数据表
LTC2954CTS8-1	Linear	Push Button On/Off Controller with μP Interru	获取价格
LTC2954CTS8-1#TRM	Linear	LTC2954 - Push Button On/Off Controller with µP Interrupt; Package: SOT; Pins: 8;	获取价格
LTC2954CTS8-1#TRMPBF	Linear	LTC2954 - Push Button On/Off Controller with µP Interrupt; Package: SOT; Pins: 8;	获取价格
LTC2954CTS8-1#TRPBF	Linear	LTC2954 - Push Button On/Off Controller with µP Interrupt; Package: SOT; Pins: 8;	获取价格
LTC2954CTS8-2	Linear	Push Button On/Off Controller with μP Interru	获取价格
LTC2954CTS8-2#TRMPBF	Linear	LTC2954 - Push Button On/Off Controller with µP Interrupt; Package: SOT; Pins: 8;	获取价格

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