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參數(shù)資料
| 型號(hào)： | LTC2951IDDB-1#TRMPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3 X 2 MM, LEAD FREE, PLASTIC, MO-229WEED-1, DFN-8 |
| 文件頁(yè)數(shù)： | 3/16頁(yè) |
| 文件大?。?/td> | 213K |
| 代理商： | LTC2951IDDB-1#TRMPBF |
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LTC2951-1/LTC2951-2
11
295112fa
P. This immediately pulls EN low, thus turning off the
DC/DC converter.
DC/DC Turn Off Blanking
When the DC/DC converter is turned off, it can take a sig-
nicant 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 P has
always powered down completely before it is restarted.
Figure 4 shows the P turning power off. After a low on
KILL releases enable, PB is ignored during the internal
256ms timer period. This is shown as tEN/EN, LOCKOUT in
Figure 4.
LTC2951-1, LTC2951-2 Versions
The LTC2951-1 (high true EN) and LTC2951-2 (low true
EN) differ only by the polarity of the EN/EN pin. Both ver-
sions allow the user to extend the amount of time that the
PB must be held low in order to begin a valid power off
sequence. An external capacitor placed on the OFFT pin
adds additional time to the turn off debounce time. If no
capacitor is placed on the OFFT pin, then the turn off de-
bounce time is given by an internally xed 32ms timer.
Both versions of the LTC2951 provide extendable KILL
turn off timer, t KILL, OFF DELAY, ADDITIONAL, by connecting
an optional external capacitor on the KILLT pin. The default
KILL turn off delay time is 128ms, tKILL, OFF DELAY.
Figure 3. P Turns Off Power (LTC2951-1)
PB & KILL IGNORED
tKILL
PB
EN
DC/DC
TURNS OFF
2951 F03
KILL
XXX DON’T CARE
P SETS
KILL LOW
PB & KILL IGNORED
PB
PB IGNORED
EN
KILL
PB BLANKING
XXX DON’T CARE
256ms
POWER ON
2951 F04
DC/DC
TURNS OFF
P SETS
KILL LOW
tEN/EN, LOCKOUT
Figure 4. DC/DC Turn Off Blanking (LTC2951-1)
APPLICATIO S I FOR ATIO
WU
U
and KILL (for a turnoff command) while consuming only
6A of supply current.
A high to low transition on PB (t5) initiates the power
off sequence. PB must stay low continuously (PB high
resets debounce timer) for a period controlled by the
default 32ms and the external OFFT capacitor (t6–t5). At
the completion of the OFFT timing (t6), an interrupt (INT)
is set, signifying that EN will be switched low after the
KILL turn off (tKILL,OFFDELAY + tKILL,OFFDELAY,ADDITIONAL)
timeout period. Once a system has nished performing
its power down operations, it can set KILL low (t7) and
thus immediately set EN low, terminating the KILL turn off
timer. The release of the PB pin is then debounced with
an internal 32ms timer.
The system is now in its reset state: where the LTC2951
is in low power mode (6A). PB is monitored for a high
to low transition.
Aborted Power On Sequence
The power on sequence is aborted when the KILL remains
low after the end of the 512ms blanking time. Figure 2 is
a simplied version of an aborted power on sequence.
At time tABORT, since KILL is still low, EN pulls low (thus
turning off the DC/DC converter).
P Turns Off Power During Normal Operation
Once the system has powered on and is operating nor-
mally, the P can turn off power by setting KILL low, as
shown in Figure 3. At time t KILL, KILL is set low by the
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| LTC2951IDDB-2#TRPBF | 功能描述:IC PUSH BUTTON ON/OFF CTRLR 8DFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
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