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LTC2954CTS8-1#TRM

更新时间： 2024-02-04 15:27:17

品牌	Logo	应用领域
凌特 - Linear		微处理器控制器
页数	文件大小	规格书
16页	582K
描述
LTC2954 - Push Button On/Off Controller with µP Interrupt; Package: SOT; Pins: 8; Temperature Range: 0°C to 70°C

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LTC2954CTS8-1#TRM 技术参数

是否Rohs认证：	符合	生命周期：	Transferred
零件包装代码：	SOT	包装说明：	VSSOP, TSSOP8,.1
针数：	8	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.08	Is Samacsys：	N
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-G8	JESD-609代码：	e3
长度：	2.9 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：	VSSOP	封装等效代码：	TSSOP8,.1
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	260	电源：	3/24 V
认证状态：	Not Qualified	座面最大高度：	1 mm
子类别：	Power Management Circuits	最大供电电流 (Isup)：	0.012 mA
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：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	1.625 mm	Base Number Matches：	1

LTC2954CTS8-1#TRM 数据手册

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LTC2954

U U

W U

APPLICATIO S I FOR ATIO

Description

maximum time required to power up the DC/DC converter

and the µP. If KILL is not brought high during this 512ms

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

tion is that 512ms is sufﬁcient time for the system to

power up.

The LTC2954 is a push button On/Off controller that pro-

vides control of system power via a push button interface.

An enable output toggles system power while an interrupt

output provides debounced push button 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 push button

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 push button 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 timethepush buttoninput (PB)must be held

low in order to toggle the enable (EN/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 EN/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 push button. 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 push button until the PDT

timer expires.

internal 64ms delay (t

) plus an adjustable power

PD,Min

down timer delay (t , see timing diagram 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

PDT

= 1.56 × 10 [µF/ms] • (t

– 1ms)

PDT

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

tializes the output pins. Any DC/DC converters connected

to the EN/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

Figure1showsasimpliﬁedLTC2954-1poweronandpower

offsequence.AhightolowtransitiononPB(t )initiatesthe

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

DB ON

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 32ms and the

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

external ONT capacitor (t –t ). Once EN goes high (t ),

enable output. C

is the ONT external capacitor (µF):

ONT

-4

an internal 512ms blanking timer is started. 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.

ONT

= 1.56 × 10 [μF/ms] • (t

– 1ms)

ONT

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 512ms blanking

The KILL pin must be pulled high within 512ms of the EN

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

time (t

). This blanking time represents the

KILL ON BLANK

2954f

1...6 7 8910 11 12...16

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与LTC2954CTS8-1#TRM相关器件

型号	品牌	描述	获取价格	数据表
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
LTC2954CTS8-2#TRPBF	Linear	LTC2954 - Push Button On/Off Controller with µP Interrupt; Package: SOT; Pins: 8;	获取价格
LTC2954IDDB-1	Linear	Push Button On/Off Controller with μP Interru	获取价格

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