- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384633 > LTC1645CS8 (LINEAR TECHNOLOGY CORP) Low Power Timer 8-SOIC 0 to 70 PDF資料下載
參數(shù)資料
| 型號(hào)： | LTC1645CS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Low Power Timer 8-SOIC 0 to 70 |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 312K |
| 代理商： | LTC1645CS8 |
14
LTC1645
An external hard reset is initiated at time point 6. The ON
pin is forced below 0.8V but above 0.4V, and the GATEn
pin voltages start to ramp down. V
OUTn
also starts to ramp
down, and RESET goes low when V
OUT2
drops below the
power-good trip level at time point 7.
Time points 8 to 15 are similar to time points 1 to 7, except
the ON pin’s different voltage thresholds are used to ramp
V
OUT1
and V
OUT2
separately. At time point 8, the ON pin
goes above 0.8V but below 2V, and one timing cycle later
(time point 9) GATE1 begins to ramp up with V
OUT1
following one gate-to-source voltage drop lower. At time
point 10, the ON pin goes above 2V and GATE2 immedi-
ately begins ramping up with V
OUT2
following one gate-to-
source voltage drop lower. As soon as V
OUT2
reaches its
power-good trip level at time point 11, a timing cycle
starts. At the end of the timing cycle (time point 12),
RESET goes high and the power-up process is complete.
The ON pin is forced below 2V but above 0.8V at time point
13 and the GATE2 pin voltage starts to ramp down. V
OUT2
also starts to ramp down and RESET goes low when V
OUT2
drops below the power-good trip level at time point 14.
When the ON pin goes below 0.8V but above 0.4V at time
point 15, GATE1 and V
OUT1
ramp down.
Time points 16 to 19 show the same power-up sequence
as time points 2 to 5, while time point 20 demonstrates the
GATEnpins being pulled immediately to ground (instead
of ramping down) by the ON pin going below 0.4V.
Power Supply Tracking and Sequencing Applications
The LTC1645 is able to sequence V
OUTn
in a number of
ways, including ramping V
OUT1
up first and down last;
ramping V
OUT1
up first and down first; ramping V
OUT1
up
first and V
OUT1
and V
OUT2
down together; and ramping
V
OUT1
and V
OUT2
up and down together.
Figure 15 shows an application ramping V
OUT1
and V
OUT2
up and down together. The ON pin must reach 0.8V to
ramp up V
OUT1
and V
OUT2
. The spare comparator pulls the
ON pin low until V
CC2
is above 2.3V, and the ON pin cannot
reach 0.8V before V
CC1
is above 3V. Thus, both input
supplies must be within regulation before a timing cycle
can start. At the end of the timing cycle, the output voltages
ramp up together. If either input supply falls out of
regulation, the gates of Q1 and Q2 are pulled low together.
Figure 16 shows an oscilloscope photo of the circuit in
Figure 15.
APPLICATIOU
W
U
U
Figure 15. Ramping 3.3V and 2.5V Up and Down Together
Q1
1/2 Si4920DY
Q2
1/2 Si4920DY
0.01
*
0.01
*
10
10
1.18k
1%
10k
1.37k
1%
0.1
μ
F
25V
0.33
μ
F
*WSL1206-01-1% (VISHAY DALE)
C
LOAD1
C
LOAD2
D1
1N4002
D2
1N4002
D3
MBR0530T1
1
2
3
8
9
6
5
11
7
13
12
14
BOTH CURRENT LIMITS: 5A
10
4
V
CC1
ON
FAULT
TIMER
GND
SENSE1
GATE2
COMP
+
GATE1
V
CC2
TRIP
POINT:
3V
V
3.3V
V
2.5V
V
3.3V
2.5A
V
2.5V
2.5A
μ
P RESET
LTC1645
(14-LEAD)
COMPOUT
FB
SENSE2
1645 F15
RESET
+
+
1.18k
1%
4.99k
1%
10k
1.37k
1%
1.82k
1%
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1645I | Low Power Timer 8-SOIC 0 to 70 |
| LTC1645IS | Low Power Timer 8-SOIC 0 to 70 |
| LTC1645IS8 | Low Power Timer 8-PDIP 0 to 70 |
| LTC1649 | Low Power Timer 8-SOIC -40 to 85 |
| LTC1649CS | Low Power Timer 8-SOIC -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1645CS8#PBF | 功能描述:IC CTLR HOT SWAP SEQ DUAL 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC1645CS8#TR | 功能描述:IC CTRLR SEQ HOTSWAP DUAL 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| LTC1645CS8#TRPBF | 功能描述:IC CTRLR SEQ HOTSWAP DUAL 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| LTC1645IS | 功能描述:IC CTRLR SEQ HOTSWAP DUAL 14SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| LTC1645IS#PBF | 功能描述:IC CTLR HOT SWAP SEQ DUAL 14SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。