参数资料
| 型号： | LT1935ES5#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 5/8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
Inductor Selection
Use inductors that are intended for high frequency power
applications. The saturation current rating should be at
least 2A. The RMS current rating, which is usually based
on heating of the inductor, should be higher than the
average current in the inductor in your application. For
best efficiency, the DC resistance should be less than
100m ? .
A good first choice for the inductor value results in a ripple
current that is 1/3 of the maximum switch current:
L = 3 (V IN /V OUT ) (V OUT – V IN )/(I MAX ? f)
I MAX is the maximum switch current of 2A and f is the
switching frequency. At lower duty cycles (less than 70%),
this value can be lowered somewhat in order to use a
physically smaller inductor.
Table 1 lists several inductor manufacturers, along with
part numbers for inductors that are a good match to the
LT1935.
Table 1. Inductor Suppliers
Use a 4.7 μ F ceramic capacitor to bypass the input of the
LT1935. Be aware that the switching regulators require a
low impedance input supply. Additional bulk capacitance
may be required if the LT1935 circuit is more than a few
inches away from the power source. If there are low ESR
capacitors nearby, the input bypass capacitor can be
reduced to 2.2 μ F.
The output capacitor supports the output under transient
loads and stabilizes the control loop of the LT1935. Look
at the typical application circuits as a starting point to
choose a value. Generally, a higher output capacitance is
required at higher load currents and lower input voltages.
Figure 3 shows transient response of the circuit in Fig-
ure 1. The load is stepped from 200mA to 400mA and back
to 200mA. The transient performance can be improved by
increasing the output capacitance, but may require a
phase lead capacitor between the output and the FB pin.
Figure 4 shows the transient response with the output
capacitor increased to 20 μ F. Figure 5 shows the additional
improvement resulting from the phase lead capacitor.
Supplier
Sumida
Model Prefix
CDRH4D18, CDRH4D28,
Coiltronics/Cooper
..
Wurth Elektronik
Coilcraft
Diode Selection
CDRH5D18, CDRH5D28, CR43
SD10, SD12, SD18, SD20
WE-PD2S, WE-PD3S, WE-PD4S
MSS5131, MSS6132, DO1608
VOUT
100mV/DIV
ILOAD
200mA/DIV
0
Use a Schottky rectifier with a 1A or higher current rating,
50 μ s/DIV
suchastheOnSemiconductorMBRM120.Its20Vreverse
voltage rating is adequate for most applications. Higher
output voltages may require a 30V of 40V diode.
Capacitor Selection
Use capacitors with low ESR (equivalent series resis-
tance). In most cases, multilayer ceramic capacitors are
the best choice. They offer high performance (very low
ESR) in a small package. Use only X5R or X7R types; they
maintain their capacitance over temperature and applied
voltage. Other suitable capacitor types include low-ESR
tantalum capacitors that are specified for power applica-
1935 F03
Figure 3. Transient Response of the Circuit in Figure 1,
C OUT = 10 μ F
VOUT
100mV/DIV
ILOAD
200mA/DIV
tions, and newer types of capacitors such as Sanyo’s
50 μ s/DIV
1935 F04
POSCAP and Panasonic’s SP CAP.
Figure 4. Transient Response with C OUT = 20 μ F
1935f
5
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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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