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| 型号： | LT3689IMSE-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： | 18/32页 |
| 文件大小： | 2188K |
| 代理商： | LT3689IMSE-5#TRPBF |
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LT3689/LT3689-5
25
3689fd
is limited by the largest available low leakage capacitor.
The accuracy of the timeout period will be affected by
capacitor leakage (the nominal charging current is 2A)
and capacitor tolerance. A low leakage ceramic capacitor
is recommended.
Selecting the Watchdog Timing Capacitor
The watchdog timeout period is adjustable and can be
optimized for software execution. The watchdog upper
boundary timeout period, tWDU is adjusted by connect-
ing a capacitor, CWDT, between the CWDT pin and ground.
Given a specified watchdog timeout period, the capacitor
is determined by:
CWDT = tWDU 55
pF
ms
This equation is accurate for upper boundary periods of
20ms, or greater. The watchdog lower boundary period
(tWDL) has a fixed relationship to tWDU for a given capaci-
tor. The tWDL period is related to tWDU by the following:
tWDL =
1
31
tWDU
In addition, the following equation can be used to calculate
the watchdog lower boundary period for a given CWDT
capacitor value.
CWDT = tWDL
1.7nF
ms
These lower boundary period equations are accurate for a
tWDL of 3ms, or greater. To program faster tWDU and tWDL
periods, see the Watchdog Upper and Lower Boundary
Periods vs Capacitance graphs in the Typical Performance
Characteristics section.
LeavingtheCWDTpinunconnectedwillgenerateaminimum
watchdog timeout of approximately 200s. Maximum
timeout is limited by the largest available low leakage
capacitor. The accuracy of the timeout period will be af-
fected by capacitor leakage (the nominal charging current
is 2A) and capacitor tolerance. A low leakage ceramic
capacitor is recommended.
Shorted and Reversed Input Protection
If an inductor is chosen to prevent excessive saturation,
the LT3689 will tolerate a shorted output. When operat-
ing in short-circuit condition, the LT3689 will reduce
its frequency until the valley current is at a typical value of
1.2A(seeFigure13).Thereisanothersituationtoconsider
in systems where the output will be held high when the
input to the LT3689 is absent. This may occur in battery
charging applications or in battery backup systems where
a battery or some other supply is diode ORed with the
APPLICATIONS INFORMATION
Figure 13. The LT3689 Reduces its Frequency to Below
100kHz to Protect Against Shorted Output with 36V Input
Figure 14. Diode D4 Prevents a Shorted Input from
Discharging a Backup Battery Tied to the Output; It Also
Protects the Circuit from a Reversed Input. The LT3689
Runs Only When the Input Is Present
VIN
3689 F14
EN/UVLO
BST
SW
LT3689
OUT
GND
DA
FB
VIN
VOUT
+
10s/DIV
VSW
20V/DIV
IL
0.5A/DIV
3689 F13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3689IMSE-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 |
| LT3689IMSE-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 |
| LT3689IUD#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 |
| LT3689IUD#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:- 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 |
| LT3689IUD-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:- 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 |
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