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LT1020 の電気的特性と機能
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LT1020のメーカーはLinear Technologyです、この部品の機能は「Micropower Regulator and Comparator」です。 |
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製品の詳細 ( Datasheet PDF )
| 部品番号 LT1020 |
| 部品説明 Micropower Regulator and Comparator |
| メーカ Linear Technology |
ロゴ |
このページの下部にプレビューとLT1020ダウンロード（pdfファイル）リンクがあります。 Total 16 pages |
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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
1 Page
ELECTRICAL CHARACTERISTICS TJ = 25°C
PARAMETER
Regulator
Feedback Bias Current
Minimum Load Current
Short-Circuit Current
Comparator
Offset Voltage
Bias Current
Offset Current
Gain-NPN Pull-Down
Common-Mode Rejection
Power Supply Rejection
Output Sink Current
NPN Saturation Voltage
Output Source Current
Input Voltage Range
Response Time
Leakage Current (NPN)
CONDITIONS
VIN = 36V
VIN = 36V
Pins 9 and 10 Shorted, VIN = 4.5V
0V ≤ VCM ≤ 35V, VIN = 36V
0V ≤ VCM ≤ 35V, VIN = 36V
0V ≤ VCM ≤ 35V, VIN = 36V
∆VOUT = 29V, RL = 20k
0V ≤ VCM ≤ 35V, VIN = 36V
4.5V ≤ VS ≤ 36V
VIN = 4.5V
IOUT = 1mA
ELECTRICAL CHARACTERISTICS
PARAMETER
Reference
Reference Voltage
Line Regulation
Load Regulation
Output Source Current
Output Sink Current
Regulator
Supply Current
Output Current
Load Regulation
Line Regulation
Dropout Voltage
Feedback Sense Voltage
Dropout Detector Current
Feedback Bias Current
Minimum Load Current
Short-Circuit Current
Comparator
Offset Voltage
Bias Current
Offset Current
Gain-NPN Pull-Down
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
VIN = 36V
VIN = 36V
Pins 9 and 10 Shorted, VIN = 4.5V
0V ≤ VCM ≤ 35V, VIN = 36V
0V ≤ VCM ≤ 35V, VIN = 36V (Note 1)
0V ≤ VCM ≤ 35V, VIN = 36V
∆VOUT = 29V, RL = 20k
LT1020
MIN TYP MAX
15 40
15
300 400
3 30
37
15 40
4 15
2000 10000
80 94
80 96
10 18
0.4 0.6
60 200
0 VIN – 1
5
2
UNITS
nA
µA
mA
mA
mV
nA
nA
V/ V
dB
dB
mA
V
µA
V
µs
µA
MIN TYP MAX
q 2.40 2.50 2.55
q 0.01 0.02
q 0.3 0.4
q1
q 0.5
q 65 95
q 85 120
q 11 20
q 125
q1
q 0.02
q 0.06
q 0.85
q 2.38 2.5 2.57
q3
q 50
q 50
q 300 400
q 2.5
30
q
q
q
q 1000
15
10
60
20
UNITS
V
%/V
%
mA
mA
µA
µA
mA
mA
%
%/ V
V
V
V
µA
nA
µA
mA
mA
mV
nA
nA
V/ V
3
3Pages
LT1020
TYPICAL PERFOR A CE CHARACTERISTICS
Regulator Thermal Regulation
0.1
VIN = 15V
VOUT = 5V
0
–0.1
50
0
0 20 40 60 80 100 120 140 160 180
TIME (ms)
1020 G16
LT1020 Turn-On Characteristic
5.5
VOUT = 5V
5.0
4.5
4.0
NO LOAD RL = 50Ω
3.5
3.0
RL = 500Ω
2.5
2.0
0
01
2345 6
INPUT VOLTAGE (V)
78
1020 G17
PI FU CTIO S
Pins 1, 14: No internal connection.
Pin 2: Regulator Output. Main output, requires 10µF
output capacitor. Can be shorted to VIN or ground without
damaging the device.
Pin 3: Input Supply. Bypass with 10µF capacitor. Must
always be more positive than ground.
Pin 4: Reference. 2.5V can source or sink current. May be
shorted to ground or up to 5V. Voltages in excess of 5V can
damage the device.
Pin 5: Comparator PNP Output. Pull-up current source for
the comparator. May be connected to any voltage from VIN
to 36V more negative than VIN (operates below ground).
Short-circuit protected. For example, if VIN is 6V then pin
5 will operate to – 30V.
Pin 6: Comparator NPN Output. May be connected to any
voltage from ground to 36V more positive than ground
(operates above VIN). Short-circuit protected.
Pins 7, 8: Comparator Inputs. Operates from ground to
VIN – 1V. Comparator inputs will withstand 36V even with
VIN of 0V.
Pin 9: Ground.
Pin 10: Current Limit. Connecting this pin to ground
decreases the regulator current limit to 3mA minimum.
Leave open when not used.
Pin 11: Feedback. This is the feedback point of the regu-
lator. When operating, it is nominally at 2.5V. Optimum
source resistance is 200k to 500k. The feedback pin
should not be driven below ground or more positive than
5V.
Pin 12: Shutdown. Turns output off.
Pin 13: Dropout Detector. This pin acts like a current
source from VIN which turns on when the output transistor
goes into saturation. The magnitude of the current de-
pends on the magnitude of the output current and the
input/output voltage differential. Pin current ranges from
5µA to about 300µA.
6
6 Page
合計 : 16 ページ |
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データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
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| 部品番号 | 部品説明 | メーカ |
| LT102 | LT Series: 25/30 WATT Wide Input Range |  ETC |
| LT1020 | Micropower Regulator and Comparator | Linear Technology |
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