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LTC2954CTS8-1 PDF预览

LTC2954CTS8-1

更新时间： 2024-01-08 10:00:49
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
Push Button On/Off Controller with μP Interrupt

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LTC2954CTS8-1 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：8Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.08Is 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-G8JESD-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 mmBase Number Matches：1

LTC2954CTS8-1 数据手册

 浏览型号LTC2954CTS8-1的Datasheet PDF文件第8页浏览型号LTC2954CTS8-1的Datasheet PDF文件第9页浏览型号LTC2954CTS8-1的Datasheet PDF文件第10页浏览型号LTC2954CTS8-1的Datasheet PDF文件第12页浏览型号LTC2954CTS8-1的Datasheet PDF文件第13页浏览型号LTC2954CTS8-1的Datasheet PDF文件第14页 
LTC2954  
U U  
W U  
APPLICATIO S I FOR ATIO  
low 512ms after it went high. Note that the LTC2954 does  
notsampleKILLandPBuntilafterthe512msinternaltimer  
has expired. The reason PB is ignored is to ensure that  
the system is not forced off while powering on. Once the  
system is now in its reset state where the LTC2954 is in  
low power mode (6µA) and PB is monitored for a high to  
low transition.  
Aborted Power On Sequence  
512ms timer expires (t ), the release of the PB pin is then  
4
debounced with an internal 32ms timer. The system has  
now properly powered on and the LTC2954 monitors PB  
and KILL for a turnoff command while consuming only  
6µA of supply current.  
The power on sequence is aborted when the KILL remains  
low at the end of the 512ms blanking time. Figure 2 is a  
simplified version of an aborted power on sequence. At  
time t  
, since KILL is still low, EN pulls low (thus  
ABORT  
turning off the DC/DC converter).  
A high to low transition on PB (t ) starts the power off  
5
sequence debounce timer. In order to assert the interrupt  
µP Turns Off Power During Normal Operation  
output (INT), PB must stay low continuously (PB high  
resets debounce timer) for 32ms (t –t ). At the comple-  
6
5
Once the system has powered on and is operating nor-  
mally, the µP can turn off power by setting KILL low, as  
tion of the power down debounce timer (t ), an internal  
6
interrupt timer keeps the interrupt output low for at least  
shown in (Figure 3). At time t  
, KILL is set low by the  
KILL  
32ms, even if PB is released between t and t . If PB is  
6
7
µP. This immediately pulls EN low, thus turning off the  
low at the end of this 32ms internal timer (t ), the external  
7
DC/DC converter.  
adjustable power down timer is started. The capacitor  
placed at the PDT pin will determine the time period of  
this timer. If the push button is released prior to 16 cycles  
DC/DC Turn Off Blanking  
When the DC/DC converter is turned off, it can take a sig-  
nificant amount of time for its output to decay to ground. It  
is desirable to wait until the output of the DC/DC converter  
is near ground before allowing the user (via PB) to restart  
the converter. This condition guarantees that the µP has  
always powered down completely before it is restarted.  
of the PDT pin, the interrupt output will go high (t ). Note  
8
that the enable output is not directly changed by this  
interrupt pulse. The function of the interrupt signal is to  
initiate a software shutdown. At t , the µP has performed  
9
its power down functions and asserted the KILL input low.  
This releases the enable output, which in turn shuts down  
system power. Note that if the push button is held long  
enough to count 16 cycles at the PDT pin, the enable pin  
would be released immediately after the 16th cycle. The  
Figure 4 shows the µP turning power off. After a low on  
KILLreleasesenable, theinternal256mstimerignoresthe  
PB pin. This is shown as t  
in (Figure 4).  
EN/EN, LOCKOUT  
t
EN/EN, Lockout  
PB IGNORED  
POWER ON  
PB  
t
KILL  
DC/DC  
TURNS OFF  
PB  
EN  
256ms  
PB BLANKING  
(INTERNAL  
SIGNAL)  
DC/DC  
TURNS OFF  
EN  
µP SETS  
KILL LOW  
µP SETS  
KILL LOW  
KILL  
XXX DON’T CARE  
KILL  
XXX DON’T CARE  
2954 F04  
2954 F03  
Figure 4. DC/DC Turn Off Blanking (LTC2954-1)  
Figure 3. µP Turns Off Power (LTC2954-1)  
2954f  
11  
1...891011121314...16

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