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LTC2954IDDB-1#TRMPBF

更新时间： 2024-01-18 03:50:48
品牌 Logo 应用领域
凌特 - Linear 电源电路电源管理电路微处理器光电二极管控制器
页数 文件大小 规格书
16页 582K
描述
LTC2954 - Push Button On/Off Controller with µP Interrupt; Package: DFN; Pins: 8; Temperature Range: -40°C to 85°C

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LTC2954IDDB-1#TRMPBF 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：8Reach 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 CIRCUITJESD-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：85 °C最低工作温度：-40 °C
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：INDUSTRIAL
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

LTC2954IDDB-1#TRMPBF 数据手册

 浏览型号LTC2954IDDB-1#TRMPBF的Datasheet PDF文件第8页浏览型号LTC2954IDDB-1#TRMPBF的Datasheet PDF文件第9页浏览型号LTC2954IDDB-1#TRMPBF的Datasheet PDF文件第10页浏览型号LTC2954IDDB-1#TRMPBF的Datasheet PDF文件第12页浏览型号LTC2954IDDB-1#TRMPBF的Datasheet PDF文件第13页浏览型号LTC2954IDDB-1#TRMPBF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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