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| 型号： | LTC1475IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.75A 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 输入电压： | 3 V ~ 18 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 750mA |
| 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： | 管件 |
| 供应商设备封装： | 8-SOIC |
LTC1474/LTC1475
Low Quiescent Current
High Efficiency Step-Down
Converters
FEATURES
DESCRIPTIO N
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High Efficiency: Over 92% Possible
Very Low Standby Current: 10 μ A Typ
Available in Space Saving 8-Lead MSOP Package
Internal 1.4 ? Power Switch (V IN = 10V)
Wide V IN Range: 3V to 18V Operation
Very Low Dropout Operation: 100% Duty Cycle
Low-Battery Detector Functional During Shutdown
Programmable Current Limit with Optional
Current Sense Resistor (10mA to 400mA Typ)
Short-Circuit Protection
Few External Components Required
Active Low Micropower Shutdown: I Q = 6 μ A Typ
Pushbutton On/Off (LTC1475 Only)
3.3V, 5V and Adjustable Output Versions
The LT C ? 1474/LTC1475 series are high efficiency step-
down converters with internal P-channel MOSFET power
switches that draw only 10 μ A typical DC supply current at
no load while maintaining output voltage. The LTC1474
uses logic-controlled shutdown while the LTC1475 fea-
tures pushbutton on/off.
The low supply current coupled with Burst Mode TM opera-
tion enables the LTC1474/LTC1475 to maintain high effi-
ciency over a wide range of loads. These features, along
with their capability of 100% duty cycle for low dropout
and wide input supply range, make the LTC1474/LTC1475
ideal for moderate current (up to 300mA) battery-powered
applications.
The peak switch current is user-programmable with an
APPLICATIO N S
optional sense resistor (defaults to 325mA minimum if not
used) providing a simple means for optimizing the design
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Cellular Telephones and Wireless Modems
4mA to 20mA Current Loop Step-Down Converter
Portable Instruments
Battery-Operated Digital Devices
Battery Chargers
Inverting Converters
Intrinsic Safety Applications
for lower current applications. The peak current control
also provides short-circuit protection and excellent start-
up behavior. A low-battery detector that remains functional
in shutdown is provided .
The LTC1474/LTC1475 series availability in 8-lead MSOP
and SO packages and need for few additional components
provide for a minimum area solution.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO N
100
LTC1474 Efficiency
V IN
4V TO 18V
+
10 μ F
25V
0.1 μ F
6
SENSE
7
V IN
V FB
1
LOW BATTERY OUT
V OUT
3.3V AT 250mA
90
80
V IN = 5V
V IN = 10V
V IN = 15V
8
3
LOW BATTERY IN
100k
RUN SHDN
L1 = SUMIDA CDRH74-101
LBI
RUN
LTC1474-3.3
GND
4
LBO
SW
2
5
L1 +
100 μ H
D1
MBR0530
100 μ F
6.3V
1474/75 F01
70
60
L = 100 μ H
V OUT = 3.3V
R SENSE = 0 ?
Figure 1. High Efficiency Step-Down Converter
50
0.03
0.3 3
LOAD CURRENT (mA)
30
300
1474/75 TA01
1
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