LT1020 Datasheet, PDF (1/16 Pages) Linear Technology – Micropower Regulator and Comparator

LT1020
Micropower Regulator
and Comparator
FEATURES
s _{40µA Supply Current}
s _{125mA Output Current}
s _{2.5V Reference Voltage}
s _{Reference Output Sources 1mA and Sinks 0.5mA}
s _{Dual Output Comparator}
s _{Comparator Sinks 10mA}
s _{Dropout Detector}
s _{0.2V Dropout Voltage}
s _{Thermal Limiting}
s _{Available in SO Package}
APPLICATI S
s _{Battery Systems}
s _{Battery Backup Systems}
s _{Portable Terminals}
s _{Portable Instruments}
DESCRIPTIO
The LT1020 is a combination micropower positive regula-
tor and free collector comparator on a single monolithic
chip. With only 40µA 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.
TYPICAL APPLICATI
5V Regulator
V_IN > 5.2V
I_Q = 40µA
3
V_IN
10µF
LT1020
GND
9
2
V_OUT
FB ¹¹
0.001µF _1M
1M
5V
10µF
1020 TA01
Dropout Voltage and Supply Current
1
10
0.1
1
0.01
0.1
1
10
100
OUTPUT CURRENT (mA)
0.1
1000
1020 TA02
1