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PDF LT1269CS Data sheet ( Hoja de datos )
| Número de pieza | LT1269CS | |
| Descripción | 4A High Efficiency Switching Regulators | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1271/LT1269
4A High Efficiency
Switching Regulators
FEATURES
DESCRIPTIO
s Wide Input Voltage Range 3.5V to 30V
The LT®1271 and LT1269 are monolithic high power
s Low Quiescent Current: 7mA
switching regulators. Identical to the popular LT1070,
s Internal 4A Switch
except for switching frequency (LT1271 = 60kHz, LT1269
s Very Few External Parts Required
= 100kHz) and slightly lower switch current, they can be
s Self Protected Against Overloads
operated in all standard switching configurations includ-
s Shutdown Mode Draws Only 100µA Supply Current
s Flyback Regulated Mode Has Fully Floating Outputs
ing buck, boost, flyback and inverting. A high current, high
efficiency switch is included on the die along with all
s Comes in Standard 5-Pin Package
oscillator, control and protection circuitry. Integration of
s Can Be Externally Synchronized (See LT1072 Data Sheet) all functions allows the LT1271/LT1269 to be built in a
APPLICATI S
standard TO-220 power package. This makes them ex-
tremely easy to use and provides “bust proof” operation
s Boost Converter
similar to that obtained with 3-pin linear regulators.
s High Efficiency Buck Converter
s PC Power Supply with Multiple Outputs
s Battery Up-Converter
s Negative-to-Positive Converter
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.
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.
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 100µA typical for standby operation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
High Efficiency 5V Regulator with Burst ModeTM Operation
VIN
6.5V TO 25V
C1 +
200µF
35V
VSW VIN
LT1271
FB
VC
GND
0.02µF
680Ω
0.1µF
+
0.03µF 4.7µF
TANT
MBR
330pF
EFFICIENCY ≈ 90%
AT IOUT = 0.4A TO 1.5A
1N4148
L1
25µH
TO 50µH
0.015Ω
VOUT
5V, 3A
+ 390µF
16V
VC DIODE
VIN
LT1432
MODE
GND
V+
VLIM
VOUT
< 0.3V = NORMAL RUN MODE
> 2.5V = SHUTDOWN
OPEN = BURST MODE OPERATION
127/691 TA01
Maximum Output Power
50
BOOST
BUCK-BOOST
40 VO = 12V
(INVERTING)
30
FLYBACK†
20
10
BUCK-BOOST
VO = 5V
(INVERTING)
0
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
1271/69 TA02
BUCK MODE OUTPUT POWER ≈ (3.5A)(VOUT)
†TRANSFORMER TURNS RATIO MUST BE
OPTIMUM TO ACHIEVE FULL POWER.
1
1 page  
TYPICAL APPLICATI S
Boost Converter (5V to 12V)
5V
100µH*
VIN VSW
LT1271
GND VC FB
1k
1µF
* COILTRONICS CTX100-2-52
MBR330
10.7k
+
1.24k
12V
0.5A
100µF
25V
1271/69 TA03
LT1271/LT1269
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
0.256
(6.502)
0.060
(1.524)
0.060
(1.524)
0.183
(4.648)
0.075
(1.905)
0.300
(7.620)
BOTTOM VIEW OF DD PAK
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
0.060
(1.524)
TYP
Q Package
5-Lead Plastic DD Pak
(LTC DWG # 05-08-1461)
0.390 – 0.415
(9.906 – 10.541)
15° TYP
0.330 – 0.370
(8.382 – 9.398)
0.165 – 0.180
(4.191 – 4.572)
0.059
(1.499)
TYP
0.143
+0.012
–0.020
( )3.632
+0.305
–0.508
0.057 – 0.077
(1.447 – 1.955)
0.028 – 0.038
(0.711 – 0.965)
0.013 – 0.023
(0.330 – 0.584)
0.045 – 0.055
(1.143 – 1.397)
0.004
+0.008
–0.004
( )0.102
+0.203
–0.102
0.095 – 0.115
(2.413 – 2.921)
0.050 ± 0.012
(1.270 ± 0.305)
Q(DD5) 0396
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LT1269CS.PDF ] | |
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