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| 型号： | LT1377IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压），升压（升压），反相，Cuk，回扫，正向转换器 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 35 V |
| 输入电压： | 2.7 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°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： | 1327 (CN2011-ZH PDF) |
LT1372/LT1377
500kHz and 1MHz
High Efficiency
1.5A Switching Regulators
FEATURES
DESCRIPTIO
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Faster Switching with Increased Efficiency
Uses Small Inductors: 4.7 μ H
All Surface Mount Components
Only 0.5 Square Inch of Board Space
Low Minimum Supply Voltage: 2.7V
Quiescent Current: 4mA Typ
Current Limited Power Switch: 1.5A
Regulates Positive or Negative Outputs
Shutdown Supply Current: 12 μ A Typ
Easy External Synchronization
8-Pin SO or PDIP Packages
The LT ? 1372/LT1377 are monolithic high frequency
switching regulators. They can be operated in all standard
switching configurations including boost, buck, flyback,
forward, inverting and “Cuk.” A 1.5A high efficiency switch
is included on the die, along with all oscillator, control and
protection circuitry. All functions of the LT1372/LT1377
are integrated into 8-pin SO/PDIP packages.
The LT1372/LT1377 typically consumes only 4mA quies-
cent current and has higher efficiency than previous parts.
High frequency switching allows for very small inductors
to be used. All surface mount components consume less
than 0.5 square inch of board space.
APPLICATIO S
New design techniques increase flexibility and maintain
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Boost Regulators
CCFL Backlight Driver
Laptop Computer Supplies
Multiple Output Flyback Supplies
Inverting Supplies
ease of use. Switching is easily synchronized to an exter-
nal logic level source. A logic low on the shutdown pin
reduces supply current to 12 μ A. Unique error amplifier
circuitry can regulate positive or negative output voltage
while maintaining simple frequency compensation tech-
niques. Nonlinear error amplifier transconductance re-
duces output overshoot on start-up or overload recovery.
Oscillator frequency shifting protects external compo-
nents during overload conditions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V-to-12V Boost Converter
12V Output Efficiency
5V
5
L1*
4.7 μ H
D1
MBRS120T3
V OUT ?
12V
100
90
V IN = 5V
22 μ F
+
V IN
OFF ON 4 S/S V SW
LT1372/LT1377
C1** FB
GND V C
8
2
R1
53.6k
1%
+
C4**
22 μ F
*FOR LT1372 USE 10 μ H
COILCRAFT DO1608-472 (4.7 μ H) OR
COILCRAFT DT3316-103 (10 μ H) OR
SUMIDA CD43-4R7 (4.7 μ H) OR
SUMIDA CD73-100KC (10 μ H) OR
80
70
MAX I OUT
6, 7
C2
0.047 μ F
R3
2k
1
C3
0.0047 μ F
R2
6.19k
1%
**AVX TPSD226M025R0200
?
L1 I OUT (LT1377) I OUT (LT1372)
4.7 μ H 0.25A NA
10 μ H 0.35A 0.29A
60
50
0.01
0.1
1
LT1372 ? TA01
OUTPUT CURRENT (A)
LT1372 ? TA02
1
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