- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44986 > LT3689EMSE-5#PBF (LINEAR TECHNOLOGY CORP) 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PDSO16 PDF資料下載
參數(shù)資料
| 型號： | LT3689EMSE-5#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件頁數(shù)： | 17/32頁 |
| 文件大?。?/td> | 2188K |
| 代理商： | LT3689EMSE-5#PBF |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁當前第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁
LT3689/LT3689-5
24
3689fd
In both watchdog modes, when WDO is asserted, the reset
timer is enabled. Any WDI pulses that appear while the
reset timer is running are ignored. When the reset timer
expires, the WDO is allowed to go high again. Therefore,
if no input is applied to the WDI pin, then the watchdog
circuitry produces a train of pulses on the WDO pin. The
high time of this pulse train is equal to the timeout period,
and low time is equal to the reset period. Also, WDO and
RST cannot be logic low simultaneously. If WDO is low
and RST goes low, then WDO will go high.
The WDE pin allows the user to turn on and off the watch-
dog function. Do not leave this pin open. Tie it high or
low to turn watchdog off or on, respectively. The W/T pin
enables/disables the window/timeout mode. Leaving this
pin open is fine and will put the watchdog in window mode.
It has a weak pull-down to ground. The WDI pin has an
internal 2A weak pull-up that keeps the WDI pin high. If
watchdog is disabled, leaving this pin open is acceptable.
Selecting the Reset Timing Capacitors
The reset timeout period is adjustable in order to accom-
modate a variety of microprocessor applications. The
reset timeout period, (tRST), is adjusted by connecting a
capacitor, CPOR, between the CPOR pin and ground. The
value of this capacitor is determined by:
CPOR = tRST 432
pF
ms
This equation is accurate for reset timeout periods of
5ms, or greater. To program faster timeout periods, see
the Reset Timeout Period vs Capacitance graph in the
Typical Performance Characteristics section. Leaving the
CPOR pin unconnected will generate a minimum reset
timeout of approximately 25s. Maximum reset timeout
APPLICATIONS INFORMATION
Figure 10. Reset Timer Waveforms
Figure 11. Window Watchdog Waveforms (W/T = Low)
Figure 12. Timeout Watchdog Waveforms (W/T = High)
50ms/DIV
VOUT
2V/DIV
CPOR
1V/DIV
RST
2V/DIV
3689 F10
tRST = 165ms
CPOR = 71nF
5ms/DIV
CWDT
1V/DIV
CPOR
1V/DIV
WDI
5V/DIV
WDO
2V/DIV
3689 F11
CWDT = 10nF, tWDL = 5.8ms
100ms/DIV
CWDT
1V/DIV
CPOR
1V/DIV
WDI
5V/DIV
WDO
2V/DIV
3689 F12
tRST = 165ms, CPOR = 71nF
tWDU = 180ms, CWDT = 10nF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT3689IUD-5#TRPBF | 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PQCC16 |
| LT3689IMSE-5#TRPBF | 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3692IUH#TRPBF | 5.8 A DUAL SWITCHING CONTROLLER, 2750 kHz SWITCHING FREQ-MAX, PQCC32 |
| LT3692IUH#PBF | 5.8 A DUAL SWITCHING CONTROLLER, 2750 kHz SWITCHING FREQ-MAX, PQCC32 |
| LT3692EUH#PBF | 5.8 A DUAL SWITCHING CONTROLLER, 2750 kHz SWITCHING FREQ-MAX, PQCC32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3689EMSE-5-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:700mA Step-Down Regulator with Power-On Reset and Watchdog Timer |
| LT3689EMSE-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:700mA Step-Down Regulator with Power-On Reset and Watchdog Timer |
| LT3689EMSE-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:700mA Step-Down Regulator with Power-On Reset and Watchdog Timer |
| LT3689EUD#PBF | 功能描述:IC REG BUCK ADJ 0.7A 16QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT3689EUD#TRPBF | 功能描述:IC REG BUCK ADJ 0.7A 16QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:10-MSOP 裸露焊盤 |
發(fā)布緊急采購，3分鐘左右您將得到回復。