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参数资料
| 型号： | LT3503EDCB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 6DFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.78 V ~ 16.2 V |
| 输入电压： | 3.6 V ~ 20 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.2MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 6-DFN-EP（2x3） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
| 其它名称： | LT3503EDCB#TRMPBFDKR |
LT3503
APPLICATIO S I FOR ATIO
Soft-Start
The SHDN pin can be used to soft-start the LT3503,
reducing the maximum input current during start-up. The
SHDN pin is driven through an external RC filter to create
a voltage ramp at this pin. Figure 8 shows the start-up
waveforms with and without the soft-start circuit. By
choosing a large RC time constant, the peak start up
current can be reduced to the current that is required to
regulate the output, with no overshoot. Choose the value
of the resistor so that it can supply 20 μ A when the SHDN
pin reaches 2.3V.
Shorted and Reversed Input Protection
If the inductor is chosen so that it won’t saturate exces-
sively, an LT3503 buck regulator will tolerate a shorted
output. There is another situation to consider in systems
where the output will be held high when the input to the
LT3503 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 LT3503’s
output. If the V IN pin is allowed to float and the SHDN pin
is held high (either by a logic signal or because it is tied to
V IN ), then the LT3503’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 SHDN pin, the SW pin current will drop to essentially
zero. However, if the V IN pin is grounded while the output
is held high, then parasitic diodes inside the LT3503 can
pull large currents from the output through the SW pin and
the V IN pin. Figure 9 shows a circuit that will run only when
the input voltage is present and that protects against a
shorted or reversed input.
V SW
5V/DIV
RUN
SHDN
I L
GND
1A/DIV
V OUT
2V/DIV
RUN
15k
SHDN
V SW
5V/DIV
V IN = 12V
V OUT = 3.3V
L = 3.3 μ H
C OUT = 10 μ F
10 μ s/DIV
3503 F08a
0.068 μ F
GND
I L
1A/DIV
V OUT
2V/DIV
V IN = 12V
10 μ s/DIV
3503 F08b
V OUT = 3.3V
L = 3.3 μ H
C OUT = 10 μ F
Figure 8. To Soft-Start the LT3503, Add a Resistor and Capacitor to the SHDN Pin. V IN = 12V, V OUT = 3.3V, C OUT = 10 μ F, R LOAD = 5 ?
3503f
14
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相关代理商/技术参数 |
参数描述 |
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| LT3504EUFD#PBF | 功能描述:IC REG BUCK ADJ 1A QUAD 28-QFN 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 |
| LT3504EUFD#TRPBF | 功能描述:IC REG BUCK ADJ 1A QUAD 28-QFN 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 |
| LT3504IUFD#PBF | 功能描述:IC REG BUCK ADJ 1A QUAD 28-QFN 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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