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| 型号： | LT3689EMSE-5#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件页数： | 17/32页 |
| 文件大小： | 2188K |
| 代理商： | LT3689EMSE-5#TRPBF |
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LT3689/LT3689-5
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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
相关PDF资料 |
PDF描述 |
|---|---|
| LT3689EUD-5#TRPBF | 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PQCC16 |
| LT3689EMSE-5#PBF | 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PDSO16 |
| 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 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3689EMSE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Step-Down Regulator with Power-On Reset and Watchdog Timer |
| LT3689EMSE-TRPBF | 制造商:LINER 制造商全称: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 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3689EUD#TRPBF | 功能描述:IC REG BUCK ADJ 0.7A 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3689EUD-5#PBF | 功能描述:IC REG BUCK 5V 0.7A 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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