LT1120IS8 Linear Technology, LT1120IS8 Datasheet

IC REG MCRPWR COMP/SHUTDWN 8SOIC

LT1120IS8

Manufacturer Part Number
LT1120IS8
Description
IC REG MCRPWR COMP/SHUTDWN 8SOIC
Manufacturer
Linear Technology
Datasheet

Specifications of LT1120IS8

Regulator Topology
Positive Adjustable
Voltage - Output
2.5 ~ 35.15 V
Voltage - Input
4.5 ~ 36 V
Voltage - Dropout (typical)
0.4V @ 125mA
Number Of Regulators
1
Current - Output
125mA (Min)
Operating Temperature
-40°C ~ 100°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Limit (min)
-

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1120IS8
Manufacturer:
LT
Quantity:
10 000
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Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT1120IS8#PBF
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Quantity:
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Part Number:
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Manufacturer:
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Part Number:
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Manufacturer:
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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
V
I
Q
IN
= 40μA
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
Battery Systems
Battery-Backup System
Portable Terminals
Portable Instruments
Memory Keep-Alive
> 5.2V
+
10μF
5
SHUTDOWN
V
SHDN
IN
U
3
LT1120
5V Regulator
GND
V
OUT
FB
1
4
2
U
0.001μF
1M
1M
+
1120 TA01
25μF
5V
Comparator and Shutdown
Micropower Regulator with
DESCRIPTIO
The LT
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.
All other trademarks are the property of their respective owners.
, LT, LTC and LTM 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
1120fd
1

Related parts for LT1120IS8

LT1120IS8 Summary of contents

Page 1

... The 2.5V reference will source or sink current. This allows 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. 1.00 5V 0.001μ ...

Page 2

... LT1120I ................................................ – 100°C Storage Temperature Range ................. – 65°C to 150° ORDER PART NUMBER LT1120CN8 GND 1 LT1120CS8 LT1120IN8 2 FB LT1120IS8 SHDN S8 PART MARKING 1120 8-LEAD TO-5 METAL CAN 1120I = 150°C, θ T JMAX ORDER PART NUMBER LT1120CJ8 OBSOLETE PACKAGES Consider the N8 and S8 Packages for Alternate Source The ● ...

Page 3

ELECTRICAL CHARACTERISTICS operating temperature range, otherwise specifications are at T PARAMETER CONDITIONS Feedback Sense Voltage V = 12V IN Shutdown Pin Voltage ≤ 0.5V V OUT Shutdown Pin Current V = 1.4V IN Feedback Bias Current Minimum Load Current V ...

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 ΔV Gain = 29V, R OUT ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Supply Current 100mA OUT 10mA OUT 0 1mA OUT OUT T = –55°C TO 125° REGULATOR INPUT-OUTPUT ...

Page 6

LT1120 CTIO S GND (Pin 1): Ground. FB (Pin 2): Feedback. This is the feedback point of the regulator. When operating nominally at 2.5V. Opti- mum source resistance is 200k to 500k. The ...

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 ...

Page 8

LT1120 U TYPICAL APPLICATIO S 5V 500k LOGIC 7 LOGIC OUTPUT LOGIC OUTPUT GOES LOW WHEN V Compensating the Comparator Amp 50μ – 100, SLEW RATE = +0.05V/μ ...

Page 9

U TYPICAL APPLICATIO S 5V Regulator > 5. OUT I = 40μA Q LT1120 + 2 10μF FB GND 1 5 BATTERY V IN INPUT INTERNAL PARASITIC DIODES OF LT1120 ...

Page 10

LT1120 W W SCHE ATIC DIAGRA 10 1120fd ...

Page 11

... INCHES 1. DIMENSIONS ARE MILLIMETERS 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 Package 8-Lead TO-5 Metal Can (.230 Inch PCD) (Reference LTC DWG # 05-08-1321) 45° ...

Page 12

... RECOMMENDED SOLDER PAD LAYOUT COMMENTS 0.4V Dropout Voltage, Includes Shutdown, SOT-223, S8 Packages Lowest I Low Dropout Regulator, Q SOT-223, S8, MS8 Packages SOT-23, 20μV Noise, 20μA I ThinSOT Package RMS Q, LT 0907 REV D • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1989 .045 ±.005 .160 ±.005 1120fd ...

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