参数资料
| 型号： | LT1302CS8-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST 5V 0.6A 8SOIC |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LT1302/LT1302-5
BLOCK DIAGRA S M
SENSE
4
V IN
6
SW
7
+
36mV
R4
1.75 ?
R1
315k
A2
–
R5
730 ?
1.24V
REFERENCE
+
CMP1
ENABLE
OFF
220kHz
OSCILLATOR
A3
Q3
Q4
160X
–
V OS
15mV
HYSTERETIC
COMPARATOR 2 μ A
V IN
DRIVER
R2
105k
–
Q5
V IN
A1
Q1
Q2
BIAS
SHDN
3
SHUTDOWN
+
ERROR
AMPLIFIER
300 ?
3.6k
1
2
5
8
GND
V C
I T
PGND
1302 F03
Figure 3. LT1302-5 Block Diagram
OPERATIO
The LT1302’s operation can best be understood by
examining the block diagram in Figure 2. The LT1302
operates in one of two modes, depending on load. With
light loads, comparator CMP1 controls the output; with
heavy loads, control is passed to error amplifier A1.
Burst Mode operation consists of monitoring the FB pin
voltage with hysteretic comparator CMP1. When the FB
voltage, related to the output voltage by external attenu-
ator R1 and R2, falls below the 1.24V reference voltage,
the oscillator is enabled. Switch Q4 alternately turns on,
causing current buildup in inductor L1, then turns off,
allowing the built-up current to flow into output capaci-
tor C3 via D1. As the output voltage increases, so does
the FB voltage; when it exceeds the reference plus
6
CMP1’s hysteresis (about 5mV) CMP1 turns the oscilla-
tor off. In this mode, peak switch current is limited to
approximately 1A by A2, Q2, and Q3. Q2’s current, set at
34 μ A, flows through R5, causing A2’s negative input to
be 25mV lower than V IN . This node must fall more than
36mV below V IN for A2 to trip and turn off the oscillator.
The remaining 11mV is generated by Q3’s current flow-
ing through R4. Emitter-area scaling sets Q3’s collector
current to 0.625% of switch Q4’s current. When Q4’s
current is 1A, Q3’s current is 6.25mA, creating an 11mV
drop across R4 which, added to R5’s 25mV drop, is
enough to trip A2.
When the output load is increased to the point where the
1A peak current cannot support the output voltage,
相关PDF资料 |
PDF描述 |
|---|---|
| LT1303IN8-5#PBF | IC REG BOOST 5V 0.2A 8DIP |
| LT1304CS8-5#TRPBF | IC REG BOOST 5V 0.2A 8SOIC |
| LT1305CS8#TRPBF | IC REG BOOST 5V 0.4A 8SOIC |
| LT1306ES8#TR | IC REG BOOST 5V 1A 8SOIC |
| LT1307BIS8#TRPBF | IC REG BOOST 3.3V/5V 0.1A 8SOIC |
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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