- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384633 > LTC1645CS (LINEAR TECHNOLOGY CORP) Low Power Timer 8-SOIC 0 to 70 PDF資料下載
參數(shù)資料
| 型號(hào)： | LTC1645CS |
| 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, PDSO14 |
| 封裝： | 0.150 INCH, PLASTIC, SO-14 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 312K |
| 代理商： | LTC1645CS |
12
LTC1645
nearly unlimited current flow. The LTC1645 discharges
the GATE pin in a few microseconds, but during this
discharge time current on the order of 150 amperes flows
from the V
CC
power supply. This current spike glitches the
power supply, causing V
CC
to dip (Figure 8a and 8b).
On recovery from overload, some supplies may over-
shoot. Other devices attached to this supply may reset or
malfunction and the overshoot may also damage some
components. An inductor (1
μ
H to 10
μ
H) in series with the
FET’s source limits the short-circuit di/dt, thereby limiting
the peak current and the supply glitch (Figure 8c and 8d).
Additional power supply bypass capacitance also reduces
the magnitude of the V
CC
glitch.
Reset
The LTC1645 uses an internal 1.238V bandgap reference,
a precision voltage comparator, and a resistive divider to
monitor the output supply voltage (Figure 9).
Whenever the voltage at the FB pin rises above its reset
threshold (1.238V), the comparator output goes high, and
a timing cycle starts (see Figure 10, time points 1 and 4).
After a complete timing cycle, RESET is released. An
external pull-up is required for the RESET pin to rise to a
logic high.
When the voltage at the FB pin drops below its reset
threshold, the comparator output goes low. After passing
through a glitch filter, RESET is pulled low (time point 2).
If the FB pin rises above the reset threshold for less than
a timing cycle, the RESET output remains low (time
point 3).
APPLICATIOU
W
U
U
Glitch Filter
The LTC1645 has a glitch filter to prevent RESET from
generating a spurious system reset in the presence of
transients on the FB pin. The filter is 20
μ
s for large
transients (greater than 150mV) and up to 80
μ
s for
smaller transients. The relationship between glitch filter
time and the transient voltage is shown in Typical Perfor-
mance Characteristics: Glitch Filter Time vs Feedback
Transient.
Timer
The system timing for the LTC1645 is generated by the
circuitry shown in Figure 11. The timer is used to set the
turn-on delay after the ON pin goes high. It also sets the
delay before the RESET pin goes high after the FB pin
exceeds 1.238V.
Whenever the timer is off, the internal N-channel shorts
the TIMER pin to ground (Figure 11). Activating the timer
connects a 2
μ
A current from V
CC1
to the TIMER pin and the
Figure 10. Supply Monitor Waveforms
Figure 9. Supply Monitor Block Diagram
Figure 11. System Timing Block Diagram
–
+
COMP
TIMER
C
TIMER
FB
RESET
V
OUT
ON
TIMER
μ
P
10k
1645 F09
RESET
LOGIC
1.238V
REFERENCE
V2
1
1.23V
1.23V
1645 F10
2
3
4
V1
V
OUT
TIMER
RESET
V2
V1
V2
–
+
COMP
TIMER
2
μ
A
C
TIMER
ON
1.23V
SUPPLY
MONITOR
1645 F11
LOGIC
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1645CS8 | Low Power Timer 8-SOIC 0 to 70 |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1645CS#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:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC1645CS#TR | 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 |
| LTC1645CS#TRPBF | 功能描述:IC CTRLR SEQ HOTSWAP 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 |
| LTC1645CS8 | 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#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) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。