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參數資料
| 型號： | LT1270AC |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 射頻放大器 |
| 文件頁數： | 1/4頁 |
| 文件大小： | 179K |
| 代理商： | LT1270AC |
1
LT1270A/LT1270
D
U
ESCRIPTIO
S
FEATURE
8A and 10A High Efficiency
Switching Regulators
I
Wide Input Voltage Range: 3.5V to 30V
I
Low Quiescent Current: 7mA
I
Internal 8A Switch (10A for LT1270A)
I
Very Few External Parts Required
I
Self-Protected Against Overloads
I
Shutdown Mode Draws Only 100
μ
A Supply Current
I
Flyback-Regulated Mode Has Fully Floating Outputs
I
Comes in Standard 5-Pin Package
I
Can be Externally Synchronized
(See LT1072 Data Sheet)
U
S
A
O
PPLICATI
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
extremely easy to use and provides “bust proof” operation
similar to that obtained with 3-pin linear regulators.
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.
The LT1270A/LT1270 use adaptive anti-sat switch drive to
allow very wide ranging load currents with no loss in
efficiency. An externally activated shutdown mode re-
duces total supply current to 100
μ
A typical for standby
operation.
I
High Efficiency Buck Converter
I
PC Power Supply with Multiple Outputs
I
Battery Upconverter
I
Negative-to-Positive Converter
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
A
O
PPLICATI
TYPICAL
V
SW
V
IN
FB
V
C
GND
MBR1035*
LT1270*
0.047
μ
F
1k
0.047
μ
F
1
μ
F
35
μ
H, 8A*
ANODE
LT1431CZ
CATHODE
REF
1N4158
560
9.1k
10k
+
470
μ
F
35V
V
IN
(8V TO 25V)
2N3904
360
1000
μ
F
25V
5V*
5A
+
EFFICIENCY IS
≈
88% @ 2A, 86% @ 5A.
FOR
μ
POWER SHUTDOWN OPTION, CONSULT FACTORY.
*THESE COMPONENTS RATED CONSERVATIVELY TO
MPROVE EFFICIENCY. MAXIMUM OUTPUT CURRENT
CAN BE 7A. FOR HIGH EFFICIENCY, THE INDUCTOR SHOULD
BE MOLYPERMALLOY OR FERRITE.
LT1270 TA01
1N5819
High Efficiency
Buck Converter
Maximum Output Power*
INPUT VOLTAGE (V)
0
0
O
20
40
60
5
10
15
20
LT1270 TA02
25
80
100
30
BOOST
FLYBACK
BUCK-BOOST, V
O
= 5V
(INVERTING)
BUCK-BOOST,
V
= 12V
(INVERTING)
*MULTIPLY BY 1.2 FOR LT1270A.
BUCK MODE OUTPUT POWER
≈
(7.5A)(V
OUT
)
TRANSFORMER TURNS RATIO MUST BE
OPTIMUM TO ACHIEVE FULL POWER
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LT1270ACT | 功能描述:IC REG MULTI CONFIG 10A TO220-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1270ACT#06PBF | 功能描述:IC REG MULTI CONFIG 10A TO220-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1270ACT#PBF | 功能描述:IC REG MULTI CONFIG 10A TO220-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關:2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應商設備封裝:6-SON（1.45x1） 產品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT1270C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:8A and 10A High Efficiency Switching Regulators |
| LT1270CT | 功能描述:IC REG MULTI CONFIG 8A TO220-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
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