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参数资料
| 型号： | LTC1474IS8-3.3#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.75 A SWITCHING REGULATOR, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 1/20页 |
| 文件大小： | 237K |
| 代理商： | LTC1474IS8-3.3#TR |
1
LTC1474/LTC1475
Low Quiescent Current
High Efficiency Step-Down
Converters
LOAD CURRENT (mA)
EFFICIENCY
(%)
100
90
80
70
60
50
0.03
3
300
1474/75 TA01
0.3
30
VIN = 5V
VIN = 10V
VIN = 15V
L = 100
H
VOUT = 3.3V
RSENSE = 0
LTC1474 Efficiency
Figure 1. High Efficiency Step-Down Converter
VIN
GND
SENSE
LBI
RUN
VFB
LBO
SW
LTC1474-3.3
+
6
3
8
1
2
5
7
4
100k
LOW BATTERY IN
RUN SHDN
0.1
F
10
F
25V
VIN
4V TO 18V
LOW BATTERY OUT
1474/75 F01
L1
100
H
D1
MBR0530
+
100
F
6.3V
VOUT
3.3V AT 250mA
L1 = SUMIDA CDRH74-101
FEATURES
DESCRIPTION
U
s
High Efficiency: Over 92% Possible
s
Very Low Standby Current: 10
A Typ
s
Available in Space Saving 8-Lead MSOP Package
s
Internal 1.4
Power Switch (VIN = 10V)
s
Wide VIN Range: 3V to 18V Operation
s
Very Low Dropout Operation: 100% Duty Cycle
s
Low-Battery Detector Functional During Shutdown
s
Programmable Current Limit with Optional
Current Sense Resistor (10mA to 400mA Typ)
s
Short-Circuit Protection
s
Few External Components Required
s
Active Low Micropower Shutdown: IQ = 6A Typ
s
Pushbutton On/Off (LTC1475 Only)
s
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
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
optional sense resistor (defaults to 325mA minimum if not
used) providing a simple means for optimizing the design
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.
APPLICATIONS
U
s
Cellular Telephones and Wireless Modems
s
4mA to 20mA Current Loop Step-Down Converter
s
Portable Instruments
s
Battery-Operated Digital Devices
s
Battery Chargers
s
Inverting Converters
s
Intrinsic Safety Applications
TYPICAL APPLICATION
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1474IS8-5 | 功能描述:IC REG BUCK 5V 0.75A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC1474IS8-5#PBF | 功能描述:IC REG BUCK 5V 0.75A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC1474IS8-5#TR | 功能描述:IC REG BUCK 5V 0.75A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC1474IS8-5#TRPBF | 功能描述:IC REG BUCK 5V 0.75A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC1474IS8-5PBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 3-18V SOIC8 |
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