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PDF LT1120 Data sheet ( Hoja de datos )
| Número de pieza | LT1120 | |
| Descripción | Micropower Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1120
Micropower Regulator with
Comparator and Shutdown
FEATURES
■ 40μA Supply Current
■ 125mA Output Current
■ 2.5V Reference Voltage
■ Reference Output Sources 2mA and Sinks 2mA
■ Open Collector Comparator Sinks 10mA
■ Logic Shutdown
■ 0.2V Dropout Voltage
■ Thermal Limiting
■ Available in 8-Lead DIP and SO Packages
U
APPLICATIO S
■ Battery Systems
■ Battery-Backup System
■ Portable Terminals
■ Portable Instruments
■ Memory Keep-Alive
DESCRIPTIO
The LT®1120 is a combination micropower positive regu-
lator and free collector comparator on a single monolithic
chip. With only 40μA supply current, the LT1120 can
supply over 125mA of output current. Input voltage range
is from 4.5V to 36V and dropout voltage is 0.6V at 125mA.
Dropout voltage decreases with lower load currents. Also
included on the chip is a class B output 2.5V reference that
can either source or sink current. A shutdown pin allows
logic shutdown of the output.
The comparator can be used for system or battery moni-
toring. For example, the comparator can be used to warn
of low system voltage. Frequency compensation of the
comparator for amplifier applications can be obtained by
adding external output capacitance.
The 2.5V reference will source or sink current. This allows
it to be used as a supply splitter or auxiliary output.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
5V Regulator
VIN > 5.2V
IQ = 40μA
+
5
VIN
4
VOUT
10μF
LT1120
2
FB
SHDN
GND
31
0.001μF
5V
1M
+
25μF
1M
SHUTDOWN
1120 TA01
Dropout Voltage and Supply Current
1.00 10
0.10 1
0.01
0.1
1 10 100
OUTPUT CURRENT (mA)
0.1
1000
1120 TA02
1120fd
1
1 page  
LT1120
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current
10
IOUT = 100mA
1
IOUT = 10mA
0.1
IOUT = 1mA
VOUT = 5V
TJ = –55°C TO 125°C
0.01
1 5 10 15 20 25
REGULATOR INPUT-OUTPUT DIFFERENTIAL (V)
1120 G07
Reference Regulation
4
3
2
1
0
–1
–2
–3
–4
–1.5 –1.0 –0.5
0
0.5 1.0
REFERENCE OUTPUT CURRENT (mA)
1.5
1120 G09
Supply Current at Dropout
10
TJ = –55°C TO 125°C
IOUT = 100mA
1
IOUT = 10mA
0.1
IOUT = 1mA
0.01
1
0.1 0.2 0.3 0.4 0.5 0.6
REGULATOR INPUT-OUTPUT DIFFERENTIAL (V)
1120 G08
Feedback Pin Current
40
35
30 TJ = –55°C
25
20
15 TJ = 25°C
10
5 TJ = 125°C
0
0.1 1 10 100 1000
REGULATOR OUTPUT CURRENT (mA)
1120 G11
Regulator Thermal Regulation
0.1
VIN = 15V
VOUT = 5V
0
–0.1
50
0
0 20 40 60 80 100 120 140 160 180
TIME (ms)
1120 G12
LT1120 Turn-On Characteristic
5.5
5.0 VOUT = 5V
4.5
NO LOAD
4.0
RL = 500Ω
3.5
3.0
2.5
2.0
0 RL = 50Ω
012345678
INPUT VOLTAGE (V)
1120 G13
1120fd
5
5 Page 
PACKAGE DESCRIPTIO
LT1120
H Package
8-Lead TO-5 Metal Can (.230 Inch PCD)
(Reference LTC DWG # 05-08-1321)
.040
(1.016)
MAX
SEATING
PLANE
.010 – .045*
(0.254 – 1.143)
.335 – .370
(8.509 – 9.398)
DIA
.305 – .335
(7.747 – 8.509)
.050
(1.270)
MAX
GAUGE
PLANE
.165 – .185
(4.191 – 4.699)
REFERENCE
PLANE
.500 – .750
(12.700 – 19.050)
.016 – .021**
(0.406 – 0.533)
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND THE SEATING PLANE
**FOR
SOLDER
DIP
LEAD
FINISH,
LEAD
DIAMETER
IS
.016
(0.406
–
–
.024
0.610)
45°TYP
.028 – .034
(0.711 – 0.864)
.110 – .160
(2.794 – 4.064)
INSULATING
STANDOFF
.027 – .045
(0.686 – 1.143)
PIN 1
.230
(5.842)
TYP
H8 (TO-5) 0.230 PCD 0801
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.300 BSC
(7.62 BSC)
CORNER LEADS OPTION
(4 PLCS)
.200
(5.080)
MAX
.005
(0.127)
MIN
.008 – .018
(0.203 – 0.457)
0° – 15° .045 – .068
(1.143 – 1.650)
FULL LEAD
OPTION
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
.023 – .045
(0.584 – 1.143)
HALF LEAD
OPTION
.045 – .065
(1.143 – 1.651)
.014 – .026
(0.360 – 0.660)
.015 – .060
(0.381 – 1.524)
.025
(0.635)
RAD TYP
.100
(2.54)
BSC
.125
3.175
MIN
OBSOLETE PACKAGES
.405
(10.287)
MAX
8 765
.220 – .310
(5.588 – 7.874)
1 234
J8 0801
.300 – .325
(7.620 – 8.255)
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.400*
(10.160)
MAX
87 65
.008 – .015
(0.203 – 0.381)
+.035
.325 –.015
( )8.255
+0.889
–0.381
.065
(1.651)
TYP
.100
(2.54)
BSC
.255 ± .015*
(6.477 ± 0.381)
.120
(3.048)
MIN
.018 ± .003
.020
(0.508)
MIN
(0.457 ± 0.076)
NOTE:
1. DIMENSIONS
ARE
INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
12
34
N8 1002
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1120fd
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1120.PDF ] | |
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