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LT1271CQ#TR PDF预览

LT1271CQ#TR

更新时间： 2024-11-26 21:12:23
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
8页 189K
描述
LT1271 - 4A High Efficiency Switching Regulators; Package: DD PAK; Pins: 5; Temperature Range: 0°C to 70°C

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中文翻译

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LT1271CQ#TR 技术参数

是否Rohs认证： 不符合生命周期：Transferred
零件包装代码：D2PAK针数：5
Reach Compliance Code：not_compliant风险等级：5.7
JESD-609代码：e0端子面层：Tin/Lead (Sn/Pb) - with Nickel (Ni) barrier
Base Number Matches：1

LT1271CQ#TR 数据手册

 浏览型号LT1271CQ#TR的Datasheet PDF文件第2页浏览型号LT1271CQ#TR的Datasheet PDF文件第3页浏览型号LT1271CQ#TR的Datasheet PDF文件第4页浏览型号LT1271CQ#TR的Datasheet PDF文件第5页浏览型号LT1271CQ#TR的Datasheet PDF文件第6页浏览型号LT1271CQ#TR的Datasheet PDF文件第7页 
LT1271/LT1269  
4A High Efficiency  
Switching Regulators  
U
DESCRIPTIO  
EATURE  
S
F
■
■
■
■
■
■
■
■
■
Wide Input Voltage Range 3.5V to 30V  
Low Quiescent Current: 7mA  
The LT®1271 and LT1269 are monolithic high power  
switching regulators. Identical to the popular LT1070,  
except for switching frequency (LT1271 = 60kHz, LT1269  
= 100kHz) and slightly lower switch current, they can be  
operated in all standard switching configurations includ-  
ingbuck, boost, flybackandinverting. Ahighcurrent, high  
efficiency switch is included on the die along with all  
oscillator, control and protection circuitry. Integration of  
all functions allows the LT1271/LT1269 to be built in a  
Internal 4A Switch  
Very Few External Parts Required  
Self Protected Against Overloads  
Shutdown Mode Draws Only 100µA Supply Current  
Flyback Regulated Mode Has Fully Floating Outputs  
Comes in Standard 5-Pin Package  
Can Be ExternallyO SyU nchronized (See LT1072 Data Sheet) standard TO-220 power package. This makes them ex-  
PPLICATI  
S
A
tremely easy to use and provides “bust proof” operation  
similar to that obtained with 3-pin linear regulators.  
■
Boost Converter  
■
High Efficiency Buck Converter  
PC Power Supply with Multiple Outputs  
Battery Up-Converter  
The LT1271/LT1269 operate with supply voltages from  
3.5V to 30V, and draw only 7mA quiescent current. By  
utilizing current mode switching techniques, they pro-  
vides excellent AC and DC load and line regulation.  
■
■
■
Negative-to-Positive Converter  
USER NOTE:  
A patented adaptive antisat switch drive allows very wide  
ranging load currents with no loss in efficiency. An exter-  
nally activated shutdown mode reduces total supply cur-  
rent to 100µA typical for standby operation.  
This data sheet is only intended to provide specifications, graphs, and a general functional  
description of the LT1271/LT1269. Application circuits are included to show the capability of the  
LT1271/LT1269. Acompletedesignmanual(AN-19)shouldbeobtainedtoassistindevelopingnew  
designs. This manual contains a comprehensive discussion of both the LT1070 and the external  
components used with it, as well as complete formulas for calculating the values of these  
components. The manual can also be used for the LT1271/LT1269 by factoring in the higher switch  
current rating and higher operating frequency.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
High Efficiency 5V Regulator with Burst ModeTM Operation  
Maximum Output Power  
50  
V
IN  
6.5V TO 25V  
V
V
SW  
IN  
BOOST  
BUCK-BOOST  
= 12V  
40  
30  
V
O
LT1271  
EFFICIENCY  
OUT  
≈ 90%  
(INVERTING)  
AT I = 0.4A TO 1.5A  
FB  
V
C
GND  
FLYBACK†  
1N4148  
0.02µF  
680Ω  
0.1µF  
20  
L1  
+
4.7µF  
0.03µF  
25µH  
TANT  
TO 50µH  
BUCK-BOOST  
0.015Ω  
10  
0
V
OUT  
5V, 3A  
V
= 5V  
O
(INVERTING)  
MBR  
330pF  
+
390µF  
16V  
0
5
15  
20  
25  
30  
10  
INPUT VOLTAGE (V)  
+
V
C
DIODE  
V
1271/69 TA02  
V
V
LIM  
BUCK MODE OUTPUT POWER  
≈
(3.5A)(V  
)
OUT  
IN  
+
C1  
†TRANSFORMER TURNS RATIO MUST BE  
OPTIMUM TO ACHIEVE FULL POWER.  
LT1432  
GND  
200µF  
V
OUT  
35V  
MODE  
<0.3V = NORMAL RUN MODE  
>2.5V = SHUTDOWN  
OPEN = BURST MODE OPERATION  
127/691 TA01  
1
12345678

中文翻译

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