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| 型号： | LT3502AIDC#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 2 X 2 MM, PLASTIC, DFN-10 |
| 文件页数： | 5/20页 |
| 文件大小： | 457K |
| 代理商： | LT3502AIDC#TR |
LT3502/LT3502A
13
3502f
APPLICATIONS INFORMATION
Short and Reverse Protection
If the inductor is chosen so that it won’t saturate excessively,
the LT3502/LT3502A will tolerate a shorted output. When
operating in short-circuit condition, the LT3502/LT3502A
will reduce their frequency until the valley current is 650mA
(Figure 8a). There is another situation to consider in sys-
tems where the output will be held high when the input to
the LT3502/LT3502A 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
LT3502/LT3502A’s output. If the VIN pin is allowed to oat
and the
SHDN pin is held high (either by a logic signal
or because it is tied to VIN), then the LT3502/LT3502A’s
internal circuitry will pull its quiescent current through
its SW pin. This is ne if your system can tolerate a few
mA in this state. If you ground the
SHDN 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 LT3502/LT3502A can pull large
currents from the output through the SW pin and the VIN
pin. Figure 8b 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 by-
pass capacitor of LT3502/LT3502A circuits. However, these
capacitors can cause problems if the LT3502/LT3502A
are plugged into a live supply (see Linear Technology
Figure 6
(6a) LT3502A Typical Minimum Input Voltage, VOUT = 3.3V
LOAD CURRENT (A)
0.001
7
6
5
4
3
2
1
0
3502 G19
0.01
0.1
1
V
IN
(V)
RUN
START
LOAD CURRENT (A)
0.001
4
V
IN
(V)
6
8
0.01
0.1
1
3502 G20
2
3
5
7
1
0
START
RUN
LOAD CURRENT (A)
0.001
7
6
5
4
3
2
1
0
3502 G21
0.01
0.1
1
V
IN
(V)
RUN
START
LOAD CURRENT (A)
0.001
4
V
IN
(V)
6
8
0.01
0.1
1
3502 G22
2
3
5
7
1
0
START
RUN
(6b) LT3502A Typical Minimum Input Voltage, VOUT = 5V
(6c) LT3502 Typical Minimum Input Voltage, VOUT = 3.3V
(6d) LT3502 Typical Minimum Input Voltage, VOUT = 5V
相关PDF资料 |
PDF描述 |
|---|---|
| LT3502AEDC#TRM | 1.1 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO10 |
| LT3502IDC#TR | 1.1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
| LT3502IDC#TRM | 1.1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
| LT3502AIDC | 1.1 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO10 |
| LT3502IDC | 1.1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
相关代理商/技术参数 |
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| LT3502AIDCTRMPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 3-40V DFN8EP |
| LT3502AIDC-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm × 2mm DFN and MS10 |
| LT3502AIMS#PBF | 功能描述:IC REG BUCK ADJ 0.5A 10MSOP 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 |
| LT3502AIMS#TRPBF | 功能描述:IC REG BUCK ADJ 0.5A 10MSOP 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 |
| LT3502AIMS-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm × 2mm DFN and MS10 |
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