LT1020IN#PBF [Linear]
LT1020 - Micropower Regulator and Comparator; Package: PDIP; Pins: 14; Temperature Range: -40°C to 85°C;
| 型号： | LT1020IN#PBF |
| 厂家： | 
Linear |
| 描述： | LT1020 - Micropower Regulator and Comparator; Package: PDIP; Pins: 14; Temperature Range: -40°C to 85°C 光电二极管 输出元件 调节器 |
| 文件： | 总16页 (文件大小：263K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1020
Micropower Regulator
and Comparator
U
FEATURES
DESCRIPTIO
The LT®1020 is a combination micropower positive regu-
lator 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.
■
Input Voltage Range: 4.5V to 36V
■
40µA 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 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
abnormaloperation.Frequencycompensationofthecom-
parator for amplifier applications can be obtained by
adding external output capacitance. Dual output or posi-
tive and negative regulators can also be made.
U
APPLICATIO S
■
Battery Systems
■
Battery Backup Systems
■
Portable Terminals
Portable Instruments
■
The 2.5V reference will source or sink current. This allows
it to be used as a supply splitter or auxiliary output.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
5V Regulator
Dropout Voltage and Supply Current
1
10
2
3
V
Q
> 5.2V
IN
5V
10µF
V
IN
V
OUT
FB
I
= 40µA
0.001µF
LT1020
1M
1M
+
+
11
10µF
GND
9
0.1
1
1020 TA01
0.01
0.1
1000
0.1
1
10
100
OUTPUT CURRENT (mA)
1020 TA02
sn1020 1020fcs
1
LT1020
ABSOLUTE AXI U RATI GS
W W W
U
(Note 1)
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 (OBSOLETE).................. –55°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
W
U
/O
PACKAGE RDER I FOR ATIO
TOP VIEW
ORDER PART
ORDER PART
NUMBER
NUMBER
1
2
3
4
5
6
7
NC
DROPOUT
DETECTOR
SHUTDOWN
FEEDBACK
CURRENT
LIMIT
14
13
12
11
10
9
NC
TOP VIEW
V
OUT
LT1020CSW
LT1020ISW
LT1020CN
LT1020IN
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
DROPOUT
DETECTOR
SHUTDOWN
FEEDBACK
CURRENT
LIMIT
V
IN
V
OUT
REF OUT
COMP PNP
COMP NPN
+INPUT
VI
N
REF OUT
COMP PNP
COMP NPN
+INPUT
GND
–INPUT
8
GND
N PACKAGE
14-LEAD PDIP
–INPUT
NC
TJMAX = 110°C, θJA = 130°C/W
NC
J PACKAGE 14-LEAD CERDIP
LT1020CJ
LT1020IJ
LT1020MJ
SW PACKAGE
16-LEAD PLASTIC (WIDE) SO
TJMAX = 150°C, θJA = 80°C/W
T
JMAX = 110°C, θJA = 150°C/W
OBSOLETE PACKAGE
Consider the N14 Package for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TJ = 25°C
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference
Reference Voltage
Line Regulation
Load Regulation
Output Source Current
Output Sink Current
Temperature Stability
Regulator
4.5V ≤ V ≤ 36V
2.46
2.50
0.01
0.2
4
2.54
0.015
0.3
V
%/V
%
IN
4.5V ≤ V ≤ 36V
IN
–0.5mA ≤ I ≤ 1mA, V = 12V
REF
IN
V
V
= 5V
= 5V
1
mA
mA
%
IN
IN
0.5
2
1
Supply Current
V
V
V
= 6V, I
≤ 100µA
45
75
11
80
120
20
µA
µA
mA
IN
IN
IN
OUT
= 36V, I
= 12V, I
≤ 100µA
OUT
OUT
= 125mA
Output Current
Load Regulation
Line Regulation
Dropout Voltage
(V – V ) ≥ 1V, V ≥ 6V
125
mA
%
IN
OUT
IN
(V – V ) ≥ 1V, V ≥ 6V
0.2
0.5
IN
OUT
IN
6V ≤ V ≤ 36V
0.01
0.015
%/V
IN
I
I
= 100µA
= 125mA
0.02
0.4
0.05
0.65
V
V
OUT
OUT
sn1020 1020fcs
2
LT1020
TJ = 25°C
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Regulator
Feedback Sense Voltage
Dropout Detector Current
Feedback Bias Current
Minimum Load Current
Short-Circuit Current
V
= 12V
2.44
3
2.5
20
15
1
2.56
V
µA
nA
µA
IN
∆V
= –0.05V, I
= 500µA
OUT
OUT
40
5
V
V
= 36V
= 36V
IN
300
30
400
mA
mA
IN
Pins 9 and 10 Shorted, V = 4.5V
3
IN
Comparator
Offset Voltage
0V ≤ V ≤ 35V, V = 36V
3
15
7
mV
nA
nA
V/V
dB
dB
mA
V
CM
IN
Bias Current
0V ≤ V ≤ 35V, V = 36V
40
15
CM
IN
Offset Current
0V ≤ V ≤ 35V, V = 36V
4
CM
IN
Gain-NPN Pull-Down
Common Mode Rejection
Power Supply Rejection
Output Sink Current
NPN Saturation Voltage
Output Source Current
Input Voltage Range
Response Time
∆V
OUT
= 29V, R = 20k
2000
80
10000
94
L
0V ≤ V ≤ 35V, V = 36V
CM
IN
4.5V ≤ V ≤ 36V
80
96
S
V
IN
= 4.5V
10
18
I
= 1mA
0.4
200
0.6
OUT
60
0
µA
V
V
– 1
IN
5
µs
Leakage Current (NPN)
2
µA
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference
Reference Voltage
Line Regulation
Load Regulation
Output Source Current
Output Sink Current
Regulator
4.5V ≤ V ≤ 36V
●
●
●
●
●
2.40
2.50
0.01
0.3
2.55
0.02
0.4
V
%/V
%
IN
4.5V ≤ V ≤ 36V
IN
–0.5mA ≤ I ≤ 1mA, V = 12V
REF
IN
V
V
= 5V
= 5V
1
mA
mA
IN
IN
0.5
Supply Current
V
V
V
= 6V, I
≤ 100µA
●
●
●
65
85
11
95
120
20
µA
µA
mA
IN
IN
IN
OUT
= 36V, I
= 12V, I
≤ 100µA
OUT
OUT
= 125mA
Output Current
Load Regulation
Line Regulation
Dropout Voltage
(V – V ) ≥ 1V, V ≥ 6V
●
●
●
125
mA
%
IN
OUT
IN
(V – V ) ≥ 1V, V ≥ 6V
1
IN
OUT
IN
6V ≤ V ≤ 36V
0.02
%/V
IN
I
I
= 100µA
= 125mA
●
●
0.06
0.85
V
V
OUT
OUT
Feedback Sense Voltage
Dropout Detector Current
Feedback Bias Current
Minimum Load Current
Short-Circuit Current
V
= 12V
●
●
●
●
2.38
3
2.5
2.57
V
µA
nA
µA
IN
∆V
= –0.05V, I
= 500µA
OUT
OUT
50
50
V
V
= 36V
= 36V
IN
IN
●
●
300
30
400
mA
mA
Pins 9 and 10 Shorted, V = 4.5V
2.5
IN
Comparator
Offset Voltage
Bias Current
0V ≤ V ≤ 35V, V = 36V
●
●
10
60
mV
nA
CM
IN
0V ≤ V ≤ 35V, V = 36V (Note 2)
15
CM
IN
sn1020 1020fcs
3
LT1020
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Comparator
Offset Current
0V ≤ V ≤ 35V, V = 36V
●
●
●
●
●
●
●
●
20
nA
V/V
dB
dB
mA
µA
V
CM
IN
Gain-NPN Pull-Down
Common Mode Rejection
Power Supply Rejection
Output Sink Current
Output Source Current
Input Voltage Range
Leakage Current (NPN)
∆V
= 29V, R = 20k
1000
80
80
5
OUT
L
0V ≤ V ≤ 35V, V = 36V
CM
IN
4.5V ≤ V ≤ 36V
IN
V
IN
= 4.5V (Note 3)
10
40
0
120
V
– 1
IN
V
IN
= 36V
8
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
Note 2: For 0V ≤ V ≤ 0.1V and T > 85°C I
is 100nA.
CM
BIAS(MAX)
of a device may be impaired.
Note 3: For T ≤ –40°C output I
is 2.5mA.
A
SINK(MIN)
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Regulator Load Regulation
Supply Current
Regulator Short-Circuit Current
0.3
0.2
100
10
350
300
250
200
150
100
50
T = –55°C TO 125°C
J
PRELOAD = 100µA
T = –55°C
J
0.1
T = 25°C
J
0
1
T = 125°C
J
–0.1
–0.2
–0.3
0.1
0.01
CURRENT LIMIT TIED TO GROUND
0
0.1
1
10
100
1000
0.1
1
10
100
1000
–50
70
TEMPERATURE (°C)
110
150
–10
30
OUTPUT CURRENT (mA)
REGULATOR OUTPUT CURRENT (mA)
1020 G01
1020 G02
1020 G03
Dropout Voltage
Dropout Voltage
Dropout Voltage
1
1
1
∆V
= 100mV
DROPOUT DETECTOR = 5µA
OUT
I DROPOUT DETECTOR = 0.1% I
OUT
0.1
0.1
0.1
I DROPOUT DETECTOR = 1% I
OUT
0.01
0.01
0.01
0.1
1
10
100
1000
0.1
1
10
100
1000
0.1
1
10
100
REGULATOR OUTPUT CURRENT (mA)
REGULATOR OUTPUT CURRENT (mA)
REGULATOR OUTPUT CURRENT (mA)
1020 G06
1020 G04
1020 G05
sn1020 1020fcs
4
LT1020
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Dropout Detector Current
Dropout Detector Current
Regulator Minimum Load Current
1000
100
10
100
10
1
100
10
I
= 100mA
OUT
V
DIFF
= 500mV
I
= 25mA
OUT
1
I
= 5mA
OUT
0.1
I
= 1mA
OUT
V
= 1V
DIFF
0.01
1
0
0.1
0.2
0.3
0.4
0.5
0.6
70 80 90 100 110
140 150
10
100
REGULATOR OUTPUT CURRENT (mA)
1000
120 130
TEMPERATURE (°C)
REGULATOR INPUT/OUTPUT DIFFERENTIAL (V)
1020 G07
1020 G08
1020 G09
Supply Current
Supply Current at Dropout
Regulator Ripple Rejection
70
65
60
55
50
45
40
35
30
10
1
10
1
T = –55°C TO 125°C
J
I
= 100mA
OUT
I
= 100mA
= 10mA
OUT
I
= 100mA
= 10mA
OUT
I
= 10mA
OUT
I
= 1mA
OUT
I
OUT
I
OUT
0.1
0.01
0.1
0.01
I
= 1mA
I
= 1mA
OUT
OUT
V
V
C
= 100VDC, 1V
= 5V
IN
OUT
OUT
P-P
V
T
= 5V
OUT
= –55°C TO 125°C
= 10µF
J
10
100
1k
10k
100k
1
5
10
15
20
25
0
0.1
0.2
0.3
0.4
0.5
0.6
RIPPLE FREQUENCY (Hz)
REGULATOR INPUT/OUTPUT DIFFERENTIAL (V)
REGULATOR INPUT/OUTPUT DIFFERENTIAL (V)
1020 G10
1020 G11
1020 G12
Feedback Pin Current
Reference Regulation
Comparator Input Bias Current
40
35
30
25
20
15
10
5
4
100
90
80
70
60
50
40
30
20
10
0
3
2
T
= 125°C
J
T
= 25°C
J
T
= –55°C
J
1
T
= –55°C
J
0
–1
–2
–3
–4
T
= 25°C
J
T
= 125°C
J
0
0.5
REFERENCE OUTPUT CURRENT (mA)
1.0
–1.5 –1.0
0
1.5
0.1
1
10
100
1000
–0.5
–1.0
–0.6
–0.2
0.2
0.6
1.0
GND
REGULATOR OUTPUT CURRENT (mA)
COMMON MODE VOLTAGE (V)
REFERRED TO PIN 9 (GND)
1020 G15
1020 G13
1020 G14
sn1020 1020fcs
5
LT1020
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Regulator Thermal Regulation
LT1020 Turn-On Characteristic
0.1
0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
0
V
OUT
= 5V
V
V
= 15V
OUT
IN
= 5V
–0.1
NO LOAD
R = 50Ω
L
R = 500Ω
L
50
0
20 40
80
120
140
160 180
1
2
3
4
5
6
7
8
0
60
100
0
TIME (ms)
INPUT VOLTAGE (V)
1020 G16
1020 G17
U
U
U
PI FU CTIO S
Pins 1, 14: No Internal Connection.
Pin 9: Ground.
Pin 2: Regulator Output. Main output, requires 10µF
output capacitor. Can be shorted to VIN or ground without
damaging the device.
Pin 10: Current Limit. Connecting this pin to ground
decreases the regulator current limit to 3mA minimum.
Leave open when not used.
Pin 3: Input Supply. Bypass with 10µF capacitor. Must
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.
always be more positive than ground.
Pin 4: Reference. 2.5V can source or sink current. May be
shortedtogroundorupto5V.Voltagesinexcessof5Vcan
damage the device.
Pin 12: Shutdown. Turns output off.
Pin 5: Comparator PNP Output. Open Collector PNP
Output. Pull-upcurrentsourceforthecomparator. Maybe
connected to any voltage from VIN to 36V more negative
thanVIN (operatesbelowground).Short-circuitprotected.
For example, if VIN is 6V then pin 5 will operate to –30V.
Pin 13: Dropout Detector. This pin acts like a current
sourcefromVIN whichturnsonwhentheoutputtransistor
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.
Pin 6: Comparator NPN Output. Open Collector 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.
sn1020 1020fcs
6
LT1020
W
BLOCK DIAGRA
CURRENT
LIMIT
10
4
REF OUT
3
V
V
IN
–
2
OUT
PNP OUT
5
6
DROPOUT
DETECTOR
13
NPN OUT
+
REF
2.5V
NON-
FB
11
9
7
8
INVERTING
INVERTING
GND
1020 BD
W U U
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APPLICATIO S I FOR ATIO
The LT1020 is especially suited for micropower system
applications. For example, the comparator section of the
LT1020 may be used as a battery checker to provide an
indication of low battery. The dropout detector can shut
down the system when the battery voltage becomes too
low to regulate. Another type of system application for the
LT1020 would be to generate the equivalent of split
supplies from a single power input. The regulator section
providesregulatedoutputvoltageandthereference,which
can both source and sink current, is then an artificial
system ground providing a split supply for the system.
IfthePNPoutputisbeingused,tomaximizethegain a1µA
to 5µA load should be placed upon the NPN output
collector. This is easily done by connecting a resistor
between the NPN collector and the reference output.
(Providing this operating current to the NPN side in-
creases the internal emitter base voltages and maximizes
the gain of the PNP stage.) Without this loading on the
NPN collector, at temperatures in excess of 75°C, the gain
of the PNP collector can decrease by a factor of 2 or 3.
Reference
Internal to the LT1020 is a 2.5V trimmed class B output
reference.Thereferencewasdesignedtobeabletosource
or sink current so it could be used in supply splitting
applications as well as a general purpose reference for
external circuitry. The design of the reference allows it to
source typically 4mA or 5mA and sink 2mA. The available
source and sink current decreases as temperature in-
creases. It is sometimes desirable to decrease the AC
outputimpedancebyplacinganoutputcapacitoronthem.
The reference in the LT1020 becomes unstable with large
capacitive loads placed directly on it. When using an
output capacitor, about 20Ω should be used to isolate the
capacitor from the reference pin. This 20Ω resistor can be
placed directly in series with the capacitor or alternatively
thereferencelinecanhave20Ωplacedinserieswithitand
thenacapacitortoground.ThisisshowninFigure1.Other
For many applications the comparator can be frequency
compensated to operate as an amplifier. Compensation
values for various gains are given in the data sheet. The
comparator gain is purposely low to make it easier to
frequency compensate as an amplifier. Two outputs are
available on the comparator, the NPN output is capable of
sinking 10mA and can drive loads connected to voltages
in excess of the positive power supply. This is useful for
driving switches or linear regulators from a higher input
voltage. The PNP output, which is capable of sourcing
100µA can drive loads below ground. It can be used to
make negative regulators with the addition of an external
pass transistor. Both outputs can be tied together to
provide an output that swings from rail-to-rail for com-
parator or amplifier applications. Although it is not speci-
fied, the gain for the PNP output is about 500 to 1000.
sn1020 1020fcs
7
LT1020
W U U
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APPLICATIO S I FOR ATIO
than placing large capacitive loads on the reference, no
other precautions are necessary and the reference is
stable with nominal stray capacitances.
Like most other IC regulators, a minimum load is required
on the output of the LT1020 to maintain regulation. For
most standard regulators this is normally specified at
5mA. Of course, for a micropower regulator this would be
a tremendously large current. The output current must be
large enough to absorb all the leakage current of the pass
transistor at the maximum operating temperature. It also
affects the transient response; low output currents have
long recovery times from load transients. At high operat-
ingtemperaturestheminimumloadcurrentincreasesand
having too low of a load current may cause the output to
go unregulated. Devices are tested for minimum load
current at high temperature. The output voltage setting
resistors to the feedback terminal can usually be used to
provide the minimum load current.
REF
4
REF
4
OUTPUT
20Ω
OUTPUT
20Ω
OR
+
+
10µF
10µF
1020 F01
Figure 1. Bypassing Reference
Overload Protection
The main regulator in the LT1020 is current limited at
approximately350mA.Thecurrentlimitisstablewithboth
input voltage and temperature. A current limit pin, when
strapped to ground, decreases the output current. This
allows the output current to be set to a lower value than
250mA. The output current available with the current limit
pin strapped to ground is not well controlled so if precise
current limiting is desired it should be provided externally
as is shown in some of the application circuits.
Frequency Compensation
TheLT1020isfrequencycompensatedbyadominantpole
on the output. An output capacitor of 10µF is usually large
enough to provide good stability. Increasing the output
capacitor above 10µF further improves stability. In order
to insure stability, a feedback capacitor is needed between
the output pin and the feedback pin. This is because stray
capacitance can form another pole with the large value of
feedback resistors used with the LT1020. Also, a feedback
capacitor minimizes noise pickup and improves ripple
rejection.
Ifthedeviceisoverloadedforlongperiodsoftime,thermal
shutdownturnstheoutputoff. Inthermalshutdown, there
may be some oscillations which can disturb external
circuitry. A diode connected between the reference and
feedbackterminalprovideshysteresisunderthermalshut-
down, so that the device turns on and off with about a 5
second period and there are no higher frequency oscilla-
tions. This is shown in Figure 2. This diode is recom-
mended for most applications. Thermal shutdown
temperature is set at approximately 145°C.
With the large dynamic operating range of the output
current, 10000:1, frequency response changes widely.
Low AC impedance capacitors are needed to insure stabil-
ity. While solid tantalum are best, aluminum electrolytics
can be used but larger capacitor values may be needed.
The CURRENT LIMIT pin allows one of the internal nodes
toberolledoffwitha0.05µFcapacitortoground. Withthis
capacitor, lower values of regulator output capacitance
can be used (down to 1µF) for low (<20mA) output
currents. Values of capacitance greater than 0.05µF de-
grade the transient response, so are not recommended.
2
V
OUT
0.001µF
LT1020
+
11
FB
10µF
REF
4
*
If the CURRENT LIMIT pin is connected to GND, the
current limit is decreased and only a 1µF output capacitor
is needed.
1020 F02
* DIODE ADDS FEEDBACK
Figure 2. Minimizing Oscillation in Thermal Shutdown
When bypassing the reference, a 20Ω resistor must be
connected in series with the capacitor.
sn1020 1020fcs
8
LT1020
U
TYPICAL APPLICATIO S
Regulator with Output Voltage Monitor
3
V
V
IN
IN
2
5V
V
OUT
V
OUT
–
500k
LOGIC
5
6
0.001µF
100k
100k
LT1020
LOGIC
OUTPUT
+
11
2.5V
10µF
FB
+
LOGIC
OUTPUT
REF
8
GND
9
7
4
1020 TA03
20k
1M
LOGIC OUTPUT GOES LOW WHEN
DROPS BY 100mV
V
OUT
Driving Logic with Dropout Detector
5V Regulator
2
3
V
Q
> 5.2V
IN
5V
V
IN
V
OUT
FB
I
= 40µA
0.001µF
LT1020
LT1020
1M
+
+
11
10µF
10µF
GND
9
DROPOUT
1M
500k
TO
2M
1020 TA07
3M
1020 TA04
Regulator with Improved Transient Response
Compensating the Comparator As an Op Amp
2
3
V
> 5.2V
5V
V
V
IN
IN
OUT
FB
7
+
0.001µF
0.001µF
LT1020
1M
1M
5
6
+
11
10µF
GND
9
8
AT A = 100,
SLEW RATE = 0.05V/µs
–6V/µs
V
–
22k
1M
1020 TA08
R2
R1
C2
C1
A
1
R1
33Ω
10 100Ω 0.047µF
100 10k 0.002µF
C1
C2
R2
V
0.1µF 0.001µF
–
100k
10k
–
–
1020 TA05
sn1020 1020fcs
9
LT1020
U
TYPICAL APPLICATIO S
1 Amp Low Dropout Regulator
Dual Output Regulator
V
> 5.2V
IN
V
IN
2.2k
3
9
V
GND
–INPUT
IN
2
8
5
V
MJE2955
5V
OUT
3
*
2
V
V
LT1020
500k
500k
0.001µF
IN
LT1020
GND
OUT
COMP
PNP
+INPUT
V
OUT
5V
11
COMP
NPN
+
REF
OUT
+
0.001µF
FB
10k*
220µF†
100k
10µF
11
4
6
7
FB
C
L
0.001µF
1M
*
FOR CURRENT LIMIT ≈ 1.5A
10
9
+
150Ω* 100k
†MUST HAVE LOW ESR.
SEVERAL 100µF CAPACITORS
CAN BE PARALLELED
100k
500k
0.01µF
10µF
–5V REG
10mA
1020 TA09
2N3904
1020 TA06
SEE LT1129 DATA SHEET FOR 700mA OUTPUT
51k
–V
IN
Maintaining Lowest IQ at Dropout
Dual Output 150mA Regulator
V
> 5.2V
3
IN
2
3
5V
V
V
IN
OUT
FB
9
GND
V
IN
0.001µF
LT1020
1M
1M
2
8
5
+
V
5V
–INPUT
11
OUT
DROP-
OUT
13
10µF
GND
9
LT1020
500k
500k
0.001µF
COMP
PNP
11
COMP
NPN
+
REF
OUT
4
2N3904*
NC
FB
+INPUT
10µF
1020 TA11
1M
6
7
*TRANSISTOR USED BECAUSE OF
LOW LEAKAGE CHARACTERISTICS
0.001µF
200k
+
100k
100k
10µF
–5V REG
150mA
1020 TA10
2N3904
*FOR TEMPERATURES GREATER THAN
51k*
70°C, REDUCE 51k RESISTORS TO 15k.
2N3904
–V
I
WILL INCREASE
4.7k
Q
51k*
0.0047µF
IN
Dual Output Positive Regulator
V
≥ 12.3V
IN
3
51k
6
V
IN
2
5V
V
OUT
FB
2N2907
–
+
0.001µF
1M
1M
12V
OUT
LT1020
190k
50k
0.01µF
+
11
10µF
+
+IN –IN
REF GND
10µF
7
8
4
9
1020 TA12
sn1020 1020fcs
10
LT1020
U
TYPICAL APPLICATIO S
Battery Backup Regulator
V
OUT
5V
MAIN
POWER
INPUT
2
3
3
2
BATTERY
INPUT
V
V
V
IN
V
IN
OUT
OUT
FB
+
0.001µF
10µF
LT1020
1M
LT1020
11
11
FB
GND
9
GND
9
50k
1M
1020 TA13
INTERNAL PARASITIC
DIODES OF LT1020
V
V
OUT
IN
5V Regulator with Shutdown
2
3
V
Q
> 5.2V
IN
= 40µA
5V
10µF
V
IN
V
OUT
I
+
LT1020
GND
NC
0.001µF
1M
1M
FB
11
2N3904*
LOGIC INPUT
9
500k
100k
1020 TA14
*TRANSISTOR USED BECAUSE OF LOW LEAKAGE
CHARACTERISTICS. TO TURN OFF THE OUTPUT
OF THE LT1020, FORCE FB (PIN 11) > 2.5V
Turn-Off at Dropout
R1
1.5M
R2
1M
V
IN
8
2
3
9
V
V
*
OUT
OUT
–
+
1M
1M
0.001µF
LT1020
+
11
FB
10µF
DROP-
OUT
REF
13
5
6
4
7
1020 TA15
1M
1.5M
*V
V
TURNS OFF AT DROPOUT.
TURN ON WHEN:
OUT
OUT
V
0.047µF
× R2
IN
= 2.5V
R1 + R2
Current Limited 1 Amp Regulator
2.2k
0.5Ω*
V
V
IN
2N3906*
MJE2955
100k
3
OUT
5V, 1A
V
IN
0.22µF
270Ω
+
220µF†
V
OUT
2
LT1020
1020 TA16
11
FB
GND
*SETS CURRENT LIMIT BUT INCREASES
DROPOUT VOLTAGE BY 0.5V
9
100k
†MUST HAVE LOW ESR. SEVERAL 100µF
CAPACITORS CAN BE PARALLELED
sn1020 1020fcs
11
LT1020
U
TYPICAL APPLICATIO S
1 Amp Regulator with Precision Current Limit
V
IN
12V
2.2k
+
100µF
MJE2955
V
5V
1A
OUT
4
3
100k
+
8
LT1020
220µF†
0.22µF
–
100k
2
11
FB
7
1.2k
+
100k
270Ω
R
L
6
5
9
1N4148
ISC
SENSE
0.03Ω
1020 TA17
†MUST HAVE LOW ESR. SEVERAL 100µF
CAPACITORS CAN BE PARALLELED
Logic Output on Dropout
V
IN
4
3
8
7
LT1020
–
+
2
V
OUT
5V
1M
0.001µF
+
11
FB
10µF
1M
6
5
9
13
1020 TA18
1M
V
IN
TTL COMPATIBLE
“DROPOUT”
0V
Charge Pump Negative Voltage Generator
V
IN
1M
51k
8
7
3
9
–
+
5
0.0033µF
2N3904
22k
6
+
1M
10µF
–V
OUT
51k
20µF
V
V
I
(NL) – (V – 1V)
IN
OUT
OUT
Q
1N5819
OR EQUIVALENT
+
(5mA) – (V – 3V)
IN
300µA
1020 TA19
sn1020 1020fcs
12
LT1020
U
TYPICAL APPLICATIO S
Charge Pump Voltage Doubler
V
IN
1M
1N5819
OR EQUIVALENT
51k
V
OUT
+
20µF
8
7
3
9
–
+
5
0.0033µF
2N3904
22k
V
V
I
(NL) 2V – 1V
IN
10µF
OUT
OUT
6
(5mA) 2V – 3V
IN
300µA
Q
1M
1020 TA20
51k
50mA Battery Charger and Regulator
V
IN
*
+
+
51k
10µF
10µF
10µF
2N2905
+
20k
220k
8
4
3
V
IN
2
V
5V
OUT
–
+
+
6V
BATTERY
LT1020
1M
1M
0.001µF
6
10µF
2.5V
FB
11
9
7
*V MUST BE GREATER THAN THE
IN
BATTERY VOLTAGE PLUS 1.3V
3.9Ω
1020 TA21
Switching Preregulator for Wide Input Voltage Range
7.5V TO 30V
V
IN
100µF
30k
3.3M
SWITCHING
POST REGULATOR
REGULATOR
2N3906
10k
OUTPUT
2N3904
1k
2N2222
2M
4mH
V
TO
REF
(PIN4)
OUT
2
1.8M
3
V
V
IN
5V
LT1020
OUT
V
2N3904
100k
100mA
+
1M
LT1020
COMPARATOR
V
FB
11
REF
22µF
4
30k
8
–
220k
220k
0.01µF
R
A
6
1.5M
7
+
MAINTAINS LOW I (< 100µA)
Q
FOR ALL INPUT VOLTAGES
R
B
0.001µF
SWITCHER EFFICIENCY = 85%
1M
2M
1020 TA22
POST REGULATOR EFFICIENCY = 82%
OVERALL EFFICIENCY = 70%
+
100µF
SWITCHING REGULATOR OUTPUT =
30k
2.5 × (1 + R /R ). FOR A CLEAN OUTPUT
A
B
FROM THE LINEAR REGULATOR SET TO V
OUT
+ 1.2V
sn1020 1020fcs
13
LT1020
W
W
SCHE ATIC DIAGRA
sn1020 1020fcs
14
LT1020
U
PACKAGE DESCRIPTIO
J Package
14-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.785
(19.939)
MAX
.005
(0.127)
MIN
14
13
12
11
10
9
8
.220 – .310
.025
(5.588 – 7.874)
(0.635)
RAD TYP
2
3
4
5
6
1
7
.200
(5.080)
MAX
.300 BSC
(7.62 BSC)
.015 – .060
(0.381 – 1.524)
.008 – .018
(0.203 – 0.457)
0° – 15°
.045 – .065
(1.143 – 1.651)
.100
(2.54)
BSC
.125
(3.175)
MIN
.014 – .026
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
(0.360 – 0.660)
J14 0801
OBSOLETE PACKAGE
N Package
14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.770*
(19.558)
MAX
14
13
12
11
10
9
8
7
.255 ± .015*
(6.477 ± 0.381)
1
2
3
5
6
4
.300 – .325
(7.620 – 8.255)
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.020
(0.508)
MIN
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
+.035
.325
.005
(0.125)
MIN
–.015
.120
(3.048)
MIN
.018 ± .003
(0.457 ± 0.076)
.100
(2.54)
BSC
+0.889
8.255
(
)
–0.381
NOTE:
INCHES
MILLIMETERS
N14 1002
1. DIMENSIONS ARE
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
sn1020 1020fcs
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
15
LT1020
U
PACKAGE DESCRIPTIO
SW Package
16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 ±.005
.030 ±.005
.398 – .413
(10.109 – 10.490)
NOTE 4
TYP
15 14
12
10
9
N
16
N
13
11
.325 ±.005
.420
MIN
.394 – .419
(10.007 – 10.643)
NOTE 3
N/2
8
1
2
3
N/2
RECOMMENDED SOLDER PAD LAYOUT
2
3
5
7
1
4
6
.291 – .299
(7.391 – 7.595)
NOTE 4
.037 – .045
(0.940 – 1.143)
.093 – .104
(2.362 – 2.642)
.010 – .029
× 45°
(0.254 – 0.737)
.005
(0.127)
RAD MIN
0° – 8° TYP
.050
(1.270)
BSC
.004 – .012
.009 – .013
(0.102 – 0.305)
NOTE 3
(0.229 – 0.330)
.014 – .019
.016 – .050
(0.356 – 0.482)
TYP
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
S16 (WIDE) 0502
2. DRAWING NOT TO SCALE
3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
V : 4.5V to 36V; V
LT1120/LT1120A
125mA, Micropower Regulator and Comparators
: 2.50V, Dropout Voltage (V at I ): 0.40V;
OUT(MIN) OUT
IN
I (Supply): 40µA; V
Q
(V): Adj; I : 10µA; S8, N8; Comparator and
OUT
SD
Reference, Logic Shutdown, Ref Sources and Sinks 2/4mA
LT1121/LT1121HV 150mA, Micropower, LDO
V : 4.2V to 30/36V; V : 3.75V, Dropout Voltage (V at I ): 0.42V;
IN
OUT(MIN)
OUT
I (Supply): 30µA; V
(V): Adj, 3.3, 5; I : 16µA; SOT-223, S8, Z;
Q
OUT
SD
Reverse-Battery Protection
V : 4.2V to 30V; V : 3.75V, Dropout Voltage (V at I ): 0.40V;
OUT(MIN) OUT
LT1129
700mA, Micropower, LDO
IN
I (Supply): 50µA; V
Q
(V): Adj, 3.3, 5; I : 16µA; DD, SOT-223, S8,
OUT
SD
TO220-5, TSSOP20
LT1616
LT1676
LT1761
25V, 500mA (I ), 1.4MHz, High Efficiency
Step-Down DC/DC Converter
V : 3.6V to 25V, V
: 1.25V, I : 1.9mA, I : <1µA, ThinSOT
Q SD
OUT
IN
OUT(MIN)
OUT(MIN)
OUT(MIN)
60V, 440mA (I ), 100kHz, High Efficiency
V : 7.4V to 60V, V
IN
: 1.24V, I : 3.2mA, I : 2.5µA, S8
Q SD
OUT
Step-Down DC/DC Converter
100mA, Low Noise Micropower, LDO
V : 1.8V to 20V; V
: 1.22V, Dropout Voltage (V at I ): 0.30V;
OUT
IN
I (Supply): 20µA; V
Q
(V): Adj, 1.5, 1.8, 2, 2.5, 2.8, 3, 3.5, 5; I : <1µA;
OUT
SD
ThinSOT; Low Noise < 20µV
, Stable with 1µF Ceramic Capacitors
RMSP-P
sn1020 1020fcs
LT/TP 0203 1K REV C • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
LINEAR TECHNOLOGY CORPORATION 1993
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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