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参数资料
| 型号： | LT1933ES6#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.6A TSOT23-6 |
| 标准包装： | 500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 31.7 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 600mA |
| 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： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
| 其它名称： | LT1933ES6 LT1933ES6-ND |
LT1933
APPLICATIONS INFORMATION
cases the discharged output capacitor will present a load
to the switcher which will allow it to start. The plots show
the worst-case situation where V IN is ramping very slowly.
For lower start-up voltage, the boost diode can be tied to
V IN ; however, this restricts the input range to one-half of
the absolute maximum rating of the BOOST pin.
At light loads, the inductor current becomes discontinu-
ous and the effective duty cycle can be very high. This
reduces the minimum input voltage to approximately
300mV above V OUT . At higher load currents, the inductor
current is continuous and the duty cycle is limited by the
maximum duty cycle of the LT1933, requiring a higher
input voltage to maintain regulation.
RUN
5V/DIV
Soft-Start
The SHDN pin can be used to soft-start the LT1933, reducing
the maximum input current during start up. The SHDN pin
is driven through an external RC ?lter to create a voltage
ramp at this pin. Figure 4 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 60μA when the SHDN pin reaches 2.3V.
RUN
SHDN
GND
RUN
15k
SHDN
1933 F04a
I IN
100mA/DIV
V OUT
5V/DIV
RUN
5V/DIV
50μs/DIV
0.1μF
GND
I IN
100mA/DIV
1933 F04b
V OUT
5V/DIV
0.5ms/DIV
Figure 4. To Soft-Start the LT1933, Add a Resistor and Capacitor to
the SHDN Pin. V INI = 12V, V OUT = 3.3V, C OUT = 22μF, R LOAD = 10Ω
1933fe
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1933ES6TRMPBF | 制造商:Linear Technology 功能描述:LTC1933 adj 600mA PWM SD dc-dc converter |
| LT1933ES6-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages |
| LT1933HDCB | 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages |
| LT1933HDCB#PBF | 制造商:Linear Technology 功能描述: |
| LT1933HDCB#TRMPBF | 功能描述:IC REG BUCK ADJ 0.6A 6DFN 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 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:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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