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| 型号： | LT1302CS8-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST 5V 0.6A 8SOIC |
| 标准包装： | 100 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2 V ~ 8 V |
| PWM 型： | 电流模式，混合 |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
| 产品目录页面： | 1326 (CN2011-ZH PDF) |
LT1302/LT1302-5
APPLICATIO N S I N FOR M ATIO N
V OUT
100mV/DIV
AC COUPLED
I T Pin
The I T pin is used to disable Burst Mode, forcing the
LT1302 to operate in current mode even at light load. To
disable Burst Mode, 3.3k resistor R1 is connected from I T
I LOAD
510mA
10mA
2ms/DIV 1302 F07c
Figure 7c. 0.01 μ F from V C to Ground.
Underdamped Response Requires Series R
to gound. More conservative frequency compensation
must be used when in this mode. A 0.1 μ F capacitor and
4.7k resistor from V C to ground has been found to be
adequate. Low frequency Burst Mode ripple can be
reduced or eliminated using this technique in many appli-
cations.
To illustrate, the transient load response of Figure 8’s
circuit is pictured without and with R1. Figure 8a shows
V OUT
100mV/DIV
AC COUPLED
output voltage and inductor current without the resistor.
Note the 6kHz burst rate when the converter is delivering
25mA. By adding the 3.3k resistor, the low frequency
I LOAD
510mA
10mA
bursting is eliminated, as shown in Figure 8b. This feature
is useful in systems that contain audio circuitry. At very
2ms/DIV
1302 F07d
light or zero load, switching frequency drops and eventu-
Figure 7d. 0.1 μ F with 10k Series RC.
Classic Overdamped Response
V IN
2.5V
10 μ H
V OUT
100mV/DIV
+
C1
330 μ F
MBRS130LT3
0.1 μ F
SW
V IN SENSE
LT1302-5
AC COUPLED
PGND
V C
I LOAD
510mA
10mA
+
220 μ F
10V
+
220 μ F
10V
GND
I T
R1
3.3k
4.7k
0.1 μ F
1302 F08
2ms/DIV
1302 F07e
V OUT
5V
Figure 7e. 0.01 μ F, 10k Series RC Shows Good
Transient Response. Slight Underdamping
Still Noticeable
V OUT
100mV/DIV
AC COUPLED
600mA
Figure 8. Addition of R1 Eliminates Low Frequency
Output Ripple in This 2.5V to 5V Boost Converter
V OUT
100mV/DIV
AC COUPLED
INDUCTOR
I LOAD 525mA
I LOAD
510mA
10mA
CURRENT
1A/DIV
25mA
2ms/DIV
1302 F07f
1ms/DIV
1302 F08a
Figure 7f. 0.01 μ F, 24k Series RC
Results in Optimum Response
Figure 8a. I T Pin Floating. Note 6kHz Burst Rate at
I LOAD = 25mA. 0.1 μ F/4.7k Compensation Network
Causes 220mV Undershoot
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1302CS8PBF | 制造商:Linear Technology 功能描述:Step up dc-dc converter,LT1302CS8 5V 2A |
| LT1303 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower High Efficiency DC/DC Converters with Low-Battery Detector Adjustable and Fixed 5V |
| LT1303-5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower High Efficiency DC/DC Converters with Low-Battery Detector Adjustable and Fixed 5V |
| LT1303CN8 | 功能描述:IC REG BOOST ADJ 0.2A 8DIP RoHS:否 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 |
| LT1303CN8#PBF | 功能描述:IC REG BOOST ADJ 0.2A 8DIP 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 |
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