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参数资料
| 型号： | LT3686IDD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件页数： | 13/28页 |
| 文件大小： | 509K |
| 代理商： | LT3686IDD#TRPBF |
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LT3686
20
3686fc
ApplicAtions inForMAtion
Short and Reverse Protection
If the inductor is chosen so that it won’t saturate exces-
sively, the LT3686 will tolerate a shorted output. When
operatinginshort-circuitcondition,theLT3686willreduce
its frequency until the valley current is 1.7A (Figure 13).
There is another situation to consider in systems where
the output will be held high when the input to the LT3686
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 LT3686’s output. If
the VIN pin is allowed to float and the EN/UVLO pin is held
high (either by a logic signal or because it is tied to VIN),
then the LT3686’s internal circuitry will pull its quiescent
current through its SW pin. This is fine if your system
can tolerate a few mA in this state. If you ground the EN/
UVLO pin, the SW pin current will drop to essentially
zero. However, if the VIN pin is grounded while the output
is held high, then parasitic diodes inside the LT3686 can
pull large currents from the output through the SW pin
and the VIN pin. Figure 14 shows a circuit that will run
only when the input voltage is present and that protects
against a shorted or reversed input.
Hot-Plugging Safely
The small size, robustness and low impedance of ceramic
capacitors make them an attractive option for the input
bypasscapacitorofLT3686circuits.However,thesecapaci-
tors can cause problems if the LT3686 are plugged into a
live supply (see Linear Technology Application Note 88 for
a complete discussion). The low loss ceramic capacitor
combined with stray inductance in series with the power
sourceformsanunderdampedtankcircuit,andthevoltage
at the VIN pin of the LT3686 can ring to twice the nominal
input voltage, possibly exceeding the LT3686’s rating and
damaging the part. If the input supply is poorly controlled
or the user will be plugging the LT3686 into an energized
Figure 13. The LT3686 Reduces its Frequency from 2MHz to
160kHz to Protect Against Shorted Output
Figure 14. Input Diode Prevents a Shorted Input from
Discharging a Backup Battery Tied to the Output; it Also
Protects the Circuit from a Reversed Input. The LT3686
Runs Only When the Input is Present
SW
DA
FB
MODE
SS
RT
VIN
BD
VOUT
GND
LT3686
3686 F14
EN/UVLO
BOOST
VSW
20V/DIV
IL
500mA/DIV
2s/DIV
3686 F13
VIN = 35V
L = 6.8H
COUT = 22F
RT = 17.4k
VOUT = 0V
相关PDF资料 |
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| LT3688IFE#TRPBF | SWITCHING REGULATOR, PDSO24 |
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| LT3688IFE#PBF | SWITCHING REGULATOR, PDSO24 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3688 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 800mA Step-Down Switching Regulator with Power-On Reset |
| LT3688EFE#PBF | 功能描述:IC REG BUCK ADJ 0.8A DL 24TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LT3688EFE#TRPBF | 功能描述:IC REG BUCK ADJ 0.8A DL 24TSSOP 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 |
| LT3688EFEPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 800mA Step-Down Switching Regulator with Power-On Reset |
| LT3688EUF#PBF | 功能描述:IC REG BUCK ADJ 0.8A DL 24QFN 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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