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LT1020 Datasheet

  • LT1020

  • Micropower Regulator and Comparator

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LT1020
Micropower Regulator
and Comparator
FEATURES
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
40碌A(chǔ) Supply Current
125mA Output Current
2.5V Reference Voltage
Reference Output Sources 1mA and Sinks 0.5mA
Dual Output Comparator
Comparator Sinks 10mA
Dropout Detector
0.2V Dropout Voltage
Thermal Limiting
Available in SO Package
The LT1020 is a combination micropower positive regula-
tor and free collector comparator on a single monolithic
chip. With only 40碌A(chǔ) supply current, the LT1020 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 dropout detector
provides an output current to indicate when the regulator
is about to drop out of regulation.
The dual output comparator can be used as a comparator
for system or battery monitoring. For example, the com-
parator can be used to warn of low system voltage while
the dropout detector shuts down the system to prevent
abnormal operation. Frequency compensation of the com-
parator for amplifier applications can be obtained by
adding external output capacitance. Dual output or posi-
tive and negative regulators can also be made.
The 2.5V reference will source or sink current. This allows
it to be used as a supply splitter or auxiliary output.
APPLICATI
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s
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Battery Systems
Battery Backup Systems
Portable Terminals
Portable Instruments
TYPICAL APPLICATI
5V Regulator
Dropout Voltage and Supply Current
1
10
LT1020
0.001碌F
FB
11
+
10碌F
GND
9
1M
+
10碌F
DROPOUT VOLTAGE (V)
V
IN
> 5.2V
I
Q
= 40碌A(chǔ)
3
V
IN
V
OUT
2
5V
SUPPLY CURRENT (mA)
1M
1020 TA01
0.1
0.01
0.1
U
1
10
1
100
OUTPUT CURRENT (mA)
0.1
1000
1020 TA02
UO
UO
1

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