LT1120 Linear Technology, LT1120 Datasheet

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LT1120

Manufacturer Part Number
LT1120
Description
Micropower Regulator with Comparator and Shutdown
Manufacturer
Linear Technology
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
V
I
IN
Q
40 A 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, SO and Metal Can Packages
Battery Systems
Battery-Backup System
Portable Terminals
Portable Instruments
Memory Keep-Alive
= 40 A
> 5.2V
+
10 F
5
SHUTDOWN
V
SHDN
IN
U
3
LT1120
5V Regulator
GND
V
OUT
FB
1
4
2
U
0.001 F
1M
1M
+
1120 TA01
25 F
5V
Comparator and Shutdown
Micropower Regulator with
DESCRIPTIO
The LT
lator and free collector comparator on a single monolithic
chip. With only 40 A 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1120 is a combination micropower positive regu-
1.00
0.10
0.01
Dropout Voltage and Supply Current
0.1
U
1
OUTPUT CURRENT (mA)
10
100
1120 TA02
1000
LT1120
1
10
0.1
1

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LT1120 Summary of contents

Page 1

... The LT 1120 is a combination micropower positive regu- lator and free collector comparator on a single monolithic chip. With only 40 A 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 ...

Page 2

... OUT I = 125mA OUT Feedback Sense Voltage V = 12V IN Shutdown Pin Voltage V 0.5V OUT 2 U (Note 1) Operating Temperature Range LT1120C ................................................ 100 C LT1120I ................................................ – 100 C Storage Temperature Range ................. – 150 ORDER PART NUMBER GND LT1120CJ8 FB 2 LT1120CN8 LT1120CS8 SHDN LT1120IN8 LT1120IS8 ...

Page 3

... 20k L 36V 36V 36V 2mA 12V IN 100 A OUT 100 A OUT = 125mA OUT ) 1V 1V 36V LT1120 MIN TYP MAX UNITS 300 400 2000 10000 V/V 80 ...

Page 4

... LT1120 ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T PARAMETER CONDITIONS Comparator Offset Voltage Bias Current V = 36V (Note 2) IN Gain V = 29V, R OUT Output Sink Current V = 4.5V (Note 3) IN Leakage Current V = 36V IN Note 1: Absolute Maximum Ratings are those values beyond which the life a device may be impaired ...

Page 5

... REGULATOR INPUT-OUTPUT DIFFERENTIAL (V) 1120 G08 Feedback Pin Current – 125 0 100 1000 REGULATOR OUTPUT CURRENT (mA) 1120 G11 LT1120 Turn-On Characteristic 5 OUT 5.0 4.5 NO LOAD R = 500 L 4.0 3.5 3.0 2.5 2 INPUT VOLTAGE (V) ...

Page 6

... For example, the comparator section of the LT1120 may be used as a battery checker to provide an indication of low battery. Another type of system applica- tion for the LT1120 would be to generate the equivalent of split supplies off of a single power input. The regulator section provides regulated output voltage and the refer- ...

Page 7

... U U APPLICATIO S I FOR ATIO Reference Internal to the LT1120 is a 2.5V trimmed class B output reference. The reference was designed to be able to source or sink current so it could be used in supply splitting applications as well as a general purpose reference for external circuitry. The design of the reference allows it to source typically 4mA or 5mA and sink 2mA ...

Page 8

... V OUT LT1120 500k – 7 –INPUT REF GND 6 1 DROPS BY 100mV OUT 2.2k 5 –6V LT1120 GND 1 1120 TA04 FOR CURRENT LIMIT 1.5A — † MUST HAVE LOW ESR. SEVERAL 100 F CAPACITORS CAN BE PARALLELED. — 100k — 10k V OUT 5V 0.001 F 98k + ...

Page 9

... Regulator with Feedback Shutdown > 5. OUT 0.001 F LT1120 2 FB GND 1 * TRANSISTOR USED BECAUSE OF LOW LEAKAGE CHARACTERISTICS. TO TURN OFF THE OUTPUT OF THE LT1120 FORCE FB (PIN 2) > 2.5V. LT1120 OUT 0.001 F 1M LT1120 + 2 FB 0.001 F GND 1M 1 22k MAIN ...

Page 10

... LT1120 W W SCHE ATIC DIAGRA 10 ...

Page 11

... MIN (0.508) MIN 0.018 0.003 0.100 0.010 (2.540 0.254) (0.457 0.076) LT1120 0.027 – 0.045 (0.686 – 1.143) PIN 1 0.200 (5.080) TYP * LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND 0.045" BELOW THE REFERENCE PLANE 0.016 – 0.024 ...

Page 12

... FAX: (408) 434-0507 www.linear-tech.com Current Limited 1A Regulator 0.5 * 2.2k MJE2955 OUT 0.22 F 100k LT1120 2 FB GND 270 100k 1 U Dimensions in inches (millimeters) unless otherwise noted. S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.053 – 0.069 0.004 – 0.010 (1.346 – ...

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