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LT1270_15

更新时间： 2024-01-07 09:38:22
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8A and 10A High Efficiency Switching Regulators

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LT1270_15 数据手册

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LT1270A/LT1270  
8A and 10A High Efficiency  
Switching Regulators  
U
FEATURES  
DESCRIPTIO  
■
The LT1270A/LT1270 are monolithic high power switch-  
ing regulators. Identical to the popular LT1070, except for  
switching frequency (60kHz) and higher switch current,  
they can be operated in all standard switching configura-  
tions 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. Inte-  
gration of all functions allows the LT1270A/LT1270 to be  
built in a standard TO-220 power package. This makes it  
extremelyeasytouseandprovides“bustproof”operation  
similar to that obtained with 3-pin linear regulators.  
Wide Input Voltage Range: 3.5V to 30V  
■
Low Quiescent Current: 7mA  
■
Internal 8A Switch (10A for LT1270A)  
Very Few External Parts Required  
Self-Protected Against Overloads  
Shutdown Mode Draws Only 100µA Supply Current  
Flyback-Regulated Mode Has Fully Floating Outputs  
Can be Externally Synchronized  
(See LT1072 Data Sheet)  
Comes in Standard 5-Pin TO-220 Package  
■
■
■
■
■
■
U
APPLICATIO S  
The LT1270A/LT1270 operate with supply voltages from  
3.5V to 30V, and draw only 7mA quiescent current. By  
utilizing current-mode switching techniques, they provide  
excellent AC and DC load and line regulation.  
■
High Efficiency Buck Converter  
■
PC Power Supply with Multiple Outputs  
■
Battery Upconverter  
Negative-to-Positive Converter  
■
TheLT1270A/LT1270useadaptiveanti-satswitchdriveto  
allow very wide ranging load currents with no loss in  
efficiency. An externally activated shutdown mode re-  
duces total supply current to 100µA typical for standby  
operation.  
USER NOTE:  
This data sheet is only intended to provide specifications, graphs and a general functional  
description of the LT1270A/LT1270. Application circuits are included to show the capability of the  
LT1270A/LT1270. A complete design manual (AN-19) should be obtained to assist in developing  
new designs. AN-19 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. AN-19 can also be used for the LT1270A/LT1270 by factoring in the higher switch  
current rating and higher operating frequency.  
A comprehensive CAD program called SwitcherCad is also available. Contact the local sales office  
in your area or the factory direct.  
U
TYPICAL APPLICATIO  
Maximum Output Power*  
High Efficiency† Buck Converter  
100  
BOOST  
†EFFICIENCY IS ≈ 88% @ 2A, 86% @ 5A.  
V
IN  
(8V TO 25V)  
FOR µPOWER SHUTDOWN OPTION, CONSULT FACTORY.  
BUCK-BOOST,  
= 12V  
V
V
80  
60  
SW  
V
*THESE COMPONENTS RATED CONSERVATIVELY TO  
IMPROVE EFFICIENCY. MAXIMUM OUTPUT CURRENT  
CAN BE 7A. FOR HIGH EFFICIENCY, THE INDUCTOR SHOULD  
BE MOLYPERMALLOY OR FERRITE.  
O
1N5819  
LT1270*  
(INVERTING)  
FB  
IN  
FLYBACK†  
GND  
V
C
+
1µF  
0.047µF  
0.047µF  
40  
1k  
35µH, 8A*  
5V*  
5A  
BUCK-BOOST, V = 5V  
O
20  
0
(INVERTING)  
9.1k  
10k  
ANODE  
+
LT1431CZ REF  
CATHODE  
470µF  
35V  
MBR1035*  
2N3904  
0
5
15  
20  
25  
30  
10  
INPUT VOLTAGE (V)  
LT1270 • TA02  
1N4158  
560Ω  
1000µF  
*MULTIPLY BY 1.2 FOR LT1270A.  
360Ω  
25V  
BUCK MODE OUTPUT POWER ≈ (7.5A)(V  
)
OUT  
† TRANSFORMER TURNS RATIO MUST BE  
OPTIMUM TO ACHIEVE FULL POWER  
LT1270 • TA01  
1270afc  
1
1234

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