LT1070/LT1071
5A and 2.5A High Efficiency
Switching Regulators
U
FEATURES
DESCRIPTION
The LT®1070/LT1071 are monolithic high power switch-
ingregulators.Theycanbeoperatedinallstandardswitch-
ing configurations including buck, boost, flyback, for-
ward, inverting and “Cuk”. A high current, high efficiency
switch is included on the die along with all oscillator,
control and protection circuitry. Integration of all func-
tions allows the LT1070/LT1071 to be built in a standard
5-pin TO-3 or T0-220 power package. This makes it ex-
tremely easy to use and provides “bust proof” operation
similar to that obtained with 3-pin linear regulators.
■
Wide Input Voltage Range: 3V to 60V
■
Low Quiescent Current: 6mA
■
Internal 5A Switch (2.5A for LT1071)
■
Very Few External Parts Required
■
■
■
■
■
■
Self Protected Against Overloads
Operates in Nearly All Switching Topologies
Shutdown Mode Draws Only 50µA Supply Current
Flyback Regulated Mode Has Fully Floating Outputs
Comes in Standard 5-Pin Packages
Can be Externally Synchronized (Consult Factory)
TheLT1070/LT1071operatewithsupplyvoltagesfrom3V
to 60V, and draw only 6mA quiescent current. They can
deliver load power up to 100W with no external power
devices. By utilizing current mode switching techniques,
they provide excellent AC and DC load and line regulation.
U
APPLICATIONS
■
Logic Supply 5V at 10A
■
5V Logic to ±15V Op Amp Supply
■
Off-Line Converter Up to 200W
TheLT1070/LT1071havemanyuniquefeaturesnotfound
even on the vastly more difficult to use low power control
chipspresentlyavailable. Theyuseadaptiveantisatswitch
drive to allow very wide ranging load currents with no loss
in efficiency. An externally activated shutdown mode
reduces total supply current to 50µA typical for standby
operation. Totally isolated and regulated outputs can be
generatedbyusingtheoptional“flybackregulationmode”
built into the LT1070/LT1071, without the need for
optocouplers or extra transformer windings.
■
Battery Upconverter
■
Power Inverter (+ to –) or (– to +)
■
Fully Floating Multiple Outputs
■
For Lower Current Applications, See the LT1072
USER NOTE:
This data sheet is only intended to provide specifications, graphs and a general functional
description of the LT1070/LT1071. Application circuits are included to show the capability of the
LT1070/LT1071. A complete design manual (AN19) should be obtained to assist in developing new
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 LT1071 by factoring in the lower switch current
rating. A second Application Note, AN25, which details off-line applications is available.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATION
Maximum Output Power*
Boost Converter (5V to 12V)
100
L2
10µH
80
BOOST
BUCK/BOOST
O
5V
L1**
OUTPUT
FILTER
C3
V
= 30V
150µH
60
40
20
0
100µF
FLYBACK
D1
V
12V
1A
IN
V
SW
FB
ISOLATED
+
R1
C2
1000µF
+
LT1070
10.7k
C3*
1%
100µF
BUCK/BOOST
= 5V
V
GND
V
C
O
R2
1.24k
1%
0
10
20
30
40
50
R3
1k
C1
1µF
INPUT VOLTAGE (V)
1070/71 TA02
*ROUGH GUIDE ONLY. BUCK MODE P
= 5A • V
.
OUT
OUT
*REQUIRED IF INPUT LEADS ≥ 2"
**PULSE ENGINEERING 92113
SPECIAL TOPOLOGIES DELIVER MORE POWER
1070/71 TA01
**DIVIDE VERTICAL POWER SCALE BY 2 FOR LT1071
1
5秒后页面跳转
英伟达新AI芯片Rubin或提前半年亮相
苹果iPhone 17将全系采用三星/LG显示LTPO OLED面板
三星深化印度制造布局，供应链本地化进程加速
芯擎科技“星辰一号”自动驾驶芯片点亮成功，2025年量产在即
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
