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Linear Technology Electronic Components Datasheet

LT1020 Datasheet

Micropower Regulator and Comparator

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LT1020 pdf
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
VIN > 5.2V
IQ = 40µA
3
VIN
+
10µF
LT1020
GND
9
2
VOUT
FB 11
0.001µF
5V
1M
+
10µF
1M
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


Linear Technology Electronic Components Datasheet

LT1020 Datasheet

Micropower Regulator and Comparator

No Preview Available !

LT1020 pdf
LT1020
ABSOLUTE AXI U RATI GS
Input Voltage .......................................................... 36V
NPN Collector Voltage ............................................ 36V
PNP Collector Voltage.............................. Supply – 36V
Output Short Circuit Duration ......................... Indefinite
Power Dissipation.............................. Internally Limited
Storage Temperature Range ................ – 65°C to 150°C
Operating Temperature Range
LT1020C ............................................. 0°C to 100°C
LT1020I ........................................ – 40°C to 100 °C
LT1020M ....................................... – 55°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NC 1
VOUT
VIN
REF OUT
2
3
4
COMP PNP 5
COMP NPN 6
+INPUT 7
14 NC
13
DROPOUT
DETECTOR
12 SHUTDOWN
11 FEEDBACK
10
CURRENT
LIMIT
9 GND
8 –INPUT
J PACKAGE
N PACKAGE
14-LEAD CERAMIC DIP 14-LEAD PLASTIC DIP
TJMAX = 150°C, θJA = 80°C/W (J)
TJMAX = 110°C, θJA = 130°C/W (N)
ORDER PART
NUMBER
LT1020CJ
LT1020CN
LT1020IJ
LT1020IN
LT1020MJ
NC 1
VOUT 2
VIN 3
REF OUT 4
COMP PNP 5
COMP NPN 6
+INPUT 7
NC 8
TOP VIEW
16 NC
15
DROPOUT
DETECTOR
14 SHUTDOWN
13
CURRENT
LIMIT
12 FEEDBACK
11 GND
10 –INPUT
9 NC
S PACKAGE
16-LEAD PLASTIC SOIC
TJMAX = 110°C, θJA = 150°C/W
ORDER PART
NUMBER
LT1020CS
LT1020IS
ELECTRICAL CHARACTERISTICS TJ = 25°C
PARAMETER
Reference
Reference Voltage
Line Regulation
Load Regulation
Output Source Current
Output Sink Current
Temperature Stability
Regulator
Supply Current
Output Current
Load Regulation
Line Regulation
Dropout Voltage
Feedback Sense Voltage
Dropout Detector Current
CONDITIONS
4.5V VIN 36V
4.5V VIN 36V
– 0.5mA IREF 1mA, VIN = 12V
VIN = 5V
VIN = 5V
VIN = 6V, IOUT 100µA
VIN = 36V, IOUT 100µA
VIN = 12V, IOUT = 125mA
(VIN – VOUT) 1V, VIN 6V
(VIN – VOUT) 1V, VIN 6V
6V VIN 36V
IOUT = 100µA
IOUT = 125mA
VIN = 12V
VOUT = – 0.05V, IOUT = 500µA
2
MIN TYP MAX
2.46 2.50 2.54
0.01 0.015
0.2 0.3
14
0.5 2
1
45 80
75 120
11 20
125
0.2 0.5
0.01 0.015
0.02 0.05
0.4 0.65
2.44 2.5 2.56
3 20
UNITS
V
%/V
%
mA
mA
%
µA
µA
mA
mA
%
%/ V
V
V
V
µA


Part Number LT1020
Description Micropower Regulator and Comparator
Maker Linear Technology
Total Page 16 Pages
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