参数资料
| 型号： | LT1935ES5#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BST FLYBK SEPIC TSOT23-5 |
| 标准包装： | 500 |
| 类型： | 升压（升压），回扫，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.27 V ~ 38 V |
| 输入电压： | 2.3 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 2A |
| 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-23-5 细型，TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-5 |
| 其它名称： | LT1935ES5 LT1935ES5-ND |
LT1935
APPLICATIO N S I N FOR M ATIO N
Soft Start
VOUT
100mV/DIV
ILOAD
200mA/DIV
The SHDN pin can be used to soft start the LT1935,
reducing the maximum input current during start up. The
SHDN pin is driven through an external RC filter to create
a ramp at this pin. Figure 6 shows the start-up waveforms
with and without the soft start circuit. Without soft start,
the input current peaks at ~3A. With soft start, the peak
50 μ s/DIV
OUT
1935 F05
current is reduced to 1A. By choosing a large RC time
constant, the peak start-up current can be reduced to the
FB
84.5k
10k
68pF
20 μ F
current that is required to regulate the output, with no
overshoot. Choose the value of the resistor so that it can
supply 100 μ A when the SHDN pin reaches 1.8V.
Figure 5. Transient Response with a 68pF Phase-Lead Capacitor
RUN
5V/DIV
VOUT
2V/DIV
IIN
1A/DIV
RUN
5V/DIV
VOUT
2V/DIV
IIN
1A/DIV
20 μ s/DIV
1935 F06a
200 μ s/DIV
1935 F06b
10k
RUN
SHDN
GND
RUN
0.22 μ F
SHDN
GND
Figure 6. Adding a Resistor and Capacitor to the SHDN Pin
Reduces the Peak Input Current During Start-Up. V IN = 3.3V,
V OUT = 5V, C2 = 20 μ F, Output Load = 10 ? .
Layout Hints
V OUT
+
GND
D1
C2
R2
L1
R1
C1
C3
V IN
SHDN
The high speed operation of the LT1935 demands careful
attention to board layout. You will not get advertised
performance with careless layout. Figure 7 shows the
recommended component placement. Make the ground
pin copper area large. This helps to lower the die
temperature.
1935 F03
Figure 7. Suggested Layout
1935f
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1935ES5TRMPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Up 2.3-16V TSOT23-5 |
| LT1936 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Dual Tracking 3A Step-Down Switching |
| LT1936EMS8E | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 36V 8-Pin MSOP EP 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, 36V, 1.4A, 500kHz. Step-Down in MS8E |
| LT1936EMS8E#PBF | 功能描述:IC REG BUCK ADJ 1.4A 8MSOP 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 |
| LT1936EMS8E#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 36V 8-Pin MSOP EP T/R |
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