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參數(shù)資料
| 型號： | LT1271CT |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 8 A SWITCHING REGULATOR, 70 kHz SWITCHING FREQ-MAX, PZFM5 |
| 封裝： | PLASTIC, TO-220, 5 PIN |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 212K |
| 代理商： | LT1271CT |
1
LT1271/LT1269
4A High Efficiency
Switching Regulators
TYPICAL APPLICATIO
N
U
High Efficiency 5V Regulator with Burst Mode
TM
Operation
D
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-
ing 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 LT1271/LT1269 to be built in a
standard TO-220 power package. This makes them ex-
tremely easy to use and provides “bust proof” operation
similar to that obtained with 3-pin linear regulators.
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.
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 100
μ
A typical for standby operation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
U
ESCRIPTIO
S
FEATURE
I
Wide Input Voltage Range 3.5V to 30V
I
Low Quiescent Current: 7mA
I
Internal 4A Switch
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
I
Boost Converter
I
High Efficiency Buck Converter
I
PC Power Supply with Multiple Outputs
I
Battery Up-Converter
I
Negative-to-Positive Converter
USER NOTE:
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. A complete design manual (AN-19) 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 LT1271/LT1269 by factoring in the higher switch
current rating and higher operating frequency.
INPUT VOLTAGE (V)
0
0
O
10
20
30
5
10
15
20
1271/69 TA02
25
40
50
30
BOOST
BUCK-BOOST
V
= 5V
(INVERTING)
FLYBACK
BUCK-BOOST
V
= 12V
(INVERTING)
BUCK MODE OUTPUT POWER
≈
(3.5A)(V
OUT
)
TRANSFORMER TURNS RATIO MUST BE
OPTIMUM TO ACHIEVE FULL POWER.
Maximum Output Power
V
SW
FB
GND
V
IN
V
C
LT1271
C1
200
μ
F
35V
0.02
μ
F
680
0.1
μ
F
0.03
μ
F
4.7
μ
F
TANT
1N4148
L1
25
μ
H
TO 50
μ
H
0.015
390
μ
F
16V
V
5V, 3A
<0.3V = NORMAL RUN MODE
>2.5V = SHUTDOWN
OPEN = BURST MODE OPERATION
V
IN
6.5V TO 25V
127/691 TA01
V
C
V
IN
MODE
V
OUT
V
LIM
V
+
LT1432
GND
DIODE
MBR
330pF
EFFICIENCY
≈
90%
AT I
OUT
= 0.4A TO 1.5A
+
+
+
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