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LT1120IS8#TRPBF

P1-P3P4-P6P7-P9P10-P12
1
LT1120
1120fd
TYPICAL APPLICATIO
U
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
Micropower Regulator with
Comparator and Shutdown
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.
■
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
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
5V Regulator
Dropout Voltage and Supply Current
OUTPUT CURRENT (mA)
0.1 1
0.01
DROPOUT VOLTAGE (V)
SUPPLY CURRENT (mA)
0.10
1.00
0.1
1
10
10 100 1000
1120 TA02
+ +
V
IN
V
OUT
FB
GNDSHDN
SHUTDOWN
LT1120
4
0.001μF1M
1M
25μF
5V
V
IN
> 5.2V
I
Q
= 40μA
1120 TA01
10μF
2
13
5
2
LT1120
1120fd
1
2
3
4
8
7
6
5
TOP VIEW
GND
FB
SHDN
V
OUT
–INPUT
COMPOUT
REF
V
IN
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
Input Voltage ........................................................... 36V
NPN Collector Voltage ............................................. 36V
Output Short-Circuit Duration .......................... Indefinite
Power Dissipation............................... Internally Limited
ABSOLUTE AXI U RATI GS
W
WW
U
ELECTRICAL CHARACTERISTICS
PACKAGE/ORDER I FOR ATIO
UUW
J8 PACKAGE
8-LEAD CERDIP
T
JMAX
= 150°C, θ
JA
= 100°C/W (J)
ORDER PART
NUMBER
LT1120CN8
LT1120CS8
LT1120IN8
LT1120IS8
S8 PART MARKING
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. T
j
= 25°C.
1120
1120I
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference
Reference Voltage 4.5V ≤ V
IN
≤ 36V 2.46 2.50 2.54 V
Line Regulation 4.5V ≤ V
IN
≤ 36V 0.01 0.015 %/V
Load Regulation –2mA ≤ I
REF
≤ 2mA, V
IN
= 12V 0.3 0.6 %
Output Source Current V
IN
= 5V 2 4 mA
Output Sink Current V
IN
= 5V 2 4 mA
Temperature Stability 1%
Regulator
Supply Current V
IN
= 6V, I
OUT
≤ 100μA4580μA
V
IN
= 36V, I
OUT
≤ 100μA 75 100 μA
V
IN
= 12V, I
OUT
= 125mA 11 20 mA
Output Current (V
IN
– V
OUT
) ≥ 1V, V
IN
≥ 6V 125 mA
Load Regulation (V
IN
– V
OUT
) ≥ 1V, V
IN
≥ 6V 0.2 0.5 %
Line Regulation 6V ≤ V
IN
≤ 36V 0.01 0.015 %/V
Dropout Voltage I
OUT
= 100μA 0.02 0.05 V
I
OUT
= 125mA 0.4 0.65 V
(Note 1)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
T
JMAX
= 110°C, θ
JA
= 130°C/W (N)
T
JMAX
= 110°C, θ
JA
= 150°C/W (S)
LT1120CJ8
ORDER PART
NUMBER
OBSOLETE PACKAGES
Consider the N8 and S8 Packages for Alternate Source
Operating Temperature Range
LT1120C ................................................ 0°C to 100°C
LT1120I ................................................ –40 to 100°C
Storage Temperature Range ................. –65°C to 150°C
TOP VIEW
COMPOUT
–INPUT
GND
FB REF
V
IN
SHDN
V
OUT
8
7
6
5
3
2
1
4
H PACKAGE
8-LEAD TO-5 METAL CAN
ORDER PART
NUMBER
LT1120CH
T
JMAX
= 150°C, θ
JA
= 150°C/W, θ
JC
= 45°C/W
3
LT1120
1120fd
PARAMETER CONDITIONS MIN TYP MAX UNITS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference
Reference Voltage 4.5V ≤ V
IN
≤ 36V ● 2.40 2.50 2.55 V
Line Regulation 4.5V ≤ V
IN
≤ 36V ● 0.01 0.02 %/V
Load Regulation –2mA ≤ I
REF
≤ 2mA, V
IN
= 12V ● 0.4 0.8 %
Output Source Current V
IN
= 5V ● 2mA
Output Sink Current V
IN
= 5V ● 2mA
Regulator
Supply Current V
IN
= 6V, I
OUT
≤ 100μA ● 65 95 μA
V
IN
= 36V, I
OUT
≤ 100μA ● 85 100 μA
V
IN
= 12V, I
OUT
= 125mA ● 11 20 mA
Output Current (V
IN
– V
OUT
) ≥ 1V, V
IN
≥ 6V ● 125 mA
Load Regulation (V
IN
– V
OUT
) ≥ 1V, V
IN
≥ 6V ● 1%
Line Regulation 6V ≤ V
IN
≤ 36V ● 0.02 %/V
Dropout Voltage I
OUT
= 100μA ● 0.06 V
I
OUT
= 125mA ● 0.85 V
Feedback Sense Voltage V
IN
= 12V ● 2.38 2.5 2.57 V
Feedback Bias Current ● 50 nA
Minimum Load Current V
IN
= 36V ● 50 μA
Short-Circuit Current V
IN
= 36V ● 300 400 mA
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. T
j
= 25°C.
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
Feedback Sense Voltage V
IN
= 12V 2.44 2.5 2.56 V
Shutdown Pin Voltage Normal 0.4 V
V
OUT
≤ 0.5V Shutdown 2.2 1.4 V
Shutdown Pin Current V
IN
= 1.4V 25 μA
Feedback Bias Current 15 40 nA
Minimum Load Current V
IN
= 36V 15 μA
Short-Circuit Current V
IN
= 36V 300 400 mA
Comparator
Offset Voltage V
IN
= 36V 37mV
Bias Current V
IN
= 36V (Note 2) 15 40 nA
Gain ΔV
OUT
= 29V, R
L
= 20k 2000 10000 V/V
Power Supply Rejection 4.5V ≤ V
S
≤ 36V 80 96 dB
Output Sink Current V
IN
= 4.5V 10 18 mA
Saturation Voltage I
OUT
= 1mA 0.4 0.6 V
Input Voltage Range 0V
IN
– 1 V
Response Time 5 μs
Leakage Current 2 μA
P1-P3P4-P6P7-P9P10-P12

LT1120IS8#TRPBF

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Buy LT1120IS8#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LDO Voltage Regulators Micropower Regulator with Comparator and Shutdown
Lifecycle:
New from this manufacturer.
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