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参数资料
| 型号： | LT3686AEDD#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： | 13/30页 |
| 文件大小： | 504K |
| 代理商： | LT3686AEDD#TRPBF |
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LT3686A
20
3686afa
ApplicAtions inForMAtion
Short and Reverse Protection
Iftheinductorischosensothatitwon’tsaturateexcessively,
the LT3686A will tolerate a shorted output. When operat-
ing in short-circuit condition, the LT3686A will reduce
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 LT3686A
is absent. This may occur in battery charging applications
or in battery backup systems where a battery or some
other supply is diode OR-ed with the LT3686A’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 LT3686A’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
theEN/UVLOpin,theSWpincurrentwilldroptoessentially
zero. However, if the VIN pin is grounded while the output
is held high, then parasitic diodes inside the LT3686A 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
bypass capacitor of LT3686A circuits. However, these
capacitors can cause problems if the LT3686A is 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 source forms an underdamped tank circuit,
and the voltage at the VIN pin of the LT3686A can ring
to twice the nominal input voltage, possibly exceeding
the LT3686A’s rating and damaging the part. If the input
supply is poorly controlled or the user will be plugging
Figure 13. The LT3686A 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 LT3686A
Runs Only When the Input is Present
SW
DA
FB
SYNC/MODE
SS
RT
VIN
BD
VOUT
GND
LT3686A
3686A F14
EN/UVLO
BOOST
VSW
20V/DIV
IL
500mA/DIV
2s/DIV
3686A F13
VIN = 35V
L = 6.8H
COUT = 22F
RT = 17.4k
VOUT = 0V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3686AEMSE#PBF | 功能描述:IC REG BUCK ADJ 1.2A 12MSOP 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3686AEMSE#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 12MSOP 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 |
| LT3686AHMSE#PBF | 功能描述:IC REG BUCK ADJ 1.2A 12MSOP 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 |
| LT3686AHMSE#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 12MSOP 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 |
| LT3686AIDD#PBF | 功能描述:IC REG BUCK ADJ 1.2A 10DFN 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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