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LT1268B PDF预览

LT1268B

更新时间： 2024-11-25 22:55:51
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
4页 67K
描述
7.5A, 150kHz Switching Regulators

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中文翻译

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LT1268B 数据手册

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LT1268B/ LT1268  
7.5A, 150kHz  
Switc hing Re g ula to rs  
U
DESCRIPTIO  
EATURE  
S
F
■
■
■
■
■
■
Wide Input Voltage Range: 3.5V to 30V  
Low Quiescent Current: 7mA  
Internal 7.5A Switch  
Very Few External Parts Required  
Self-Protected Against Overloads  
Available in Standard and Surface Mount  
5-Pin Packages  
The LT1268B and LT1268 are monolithic high power  
switching regulators. Identical to the popular LT1070,  
except for switching frequency (150kHz) and higher  
switch current, they can be operated in all standard  
switching configurations including buck, boost, flyback,  
and inverting. A high current, high efficiency switch is  
included on the die along with all oscillator, control, and  
protection circuitry. Integration of all functions allows  
the LT1268 to be built in standard 5-pin power packages.  
This makes it extremely easy to use and provides “bust  
proof” operations similar to that obtained with 3-pin  
linear regulators.  
■
Can Be Externally Synchronized  
(See LT1072 Data Sheet)  
O U  
PPLICATI  
S
A
■
High Efficiency Boost Converter  
PC Power Supply with Multiple Outputs  
Battery Upconverter  
■
■
■
The LT1268 operate with supply voltages from 3.5V to  
30V and draw only 7mA quiescent current. By utilizing  
current mode switching techniques, it provides excellent  
AC and DC load and line regulation.  
Negative-to-Positive Converter  
USER NOTE:  
This data sheet is only intended to provide specifications, graphs, and a general functional  
description of the LT1268B/LT1268. Application circuits are included to show the capability of the  
LT1268B/LT1268.Acompletedesignmanual(AN19)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 LT1268B/LT1268 factoring in the higher switch  
current rating and higher operating frequency.  
TheLT1268useanadaptiveanti-satswitchdrivetoallow  
verywiderangingloadcurrents withnoloss inefficiency.  
An externally activated shutdown mode reduces total  
supply current to 100µA typical for standby operation.  
U
O
TYPICAL APPLICATI  
Boost Regulator with 5.3V ±1% Output  
Efficiency of 5.3V Boost Converter  
D1  
MBR1035  
100  
L1  
8µH, 5A*  
L2  
2µH, 5A**  
V
V
OUT  
IN  
4.7V TO  
5.3V  
5.3V ±1%  
3.75A  
V
= 5.3V  
IN  
D2, D3†  
1N4001  
90  
80  
70  
60  
C3  
390µF  
16V  
+
V
IN  
= 4.7V  
C5  
0.02  
R1  
4.043k  
0.1%  
V
IN  
= 5V  
V
V
SW  
IN  
LT1268B FB  
CASE GND  
C4  
+
C1  
220µF  
16V  
+
390µF  
16V  
V
C
R2  
1.24k  
0.1%  
C2  
0.068  
R3  
220Ω  
2
LOAD CURRENT (A)  
0
1
3
4
LT1268 • TA01  
*COILTRONICS CTX8-5-52  
**COILTRONICS CTX2-5-52  
†OPTIONAL. D2 AND D3 ARE USED TO INCREASE  
LT1268 • TA02  
UNDERVOLTAGE LOCKOUT FROM 2.7V TO ≈4V.  
1
1234

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