LINER LT1120C Micropower regulator with comparator and shutdown Datasheet

LT1120
Micropower Regulator with
Comparator and Shutdown
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FEATURES
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DESCRIPTIO
40µA Supply Current
125mA Output Current
2.5V Reference Voltage
Reference Output Sources 2mA and Sinks 2mA
Open Collector
Comparator Sinks 10mA
Logic Shutdown
0.2V Dropout Voltage
Thermal Limiting
Available in 8-Lead DIP, SO and Metal Can Packages
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APPLICATIO S
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Battery Systems
Battery-Backup System
Portable Terminals
Portable Instruments
Memory Keep-Alive
The LT®1120 is a combination micropower positive regulator and free collector comparator on a single monolithic
chip. With only 40µA supply current, the LT1120 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 shutdown pin allows
logic shutdown of the output.
The comparator can be used for system or battery monitoring. For example, the comparator can be used to warn
of low system voltage. Frequency compensation of the
comparator for amplifier applications can be obtained by
adding external output capacitance.
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.
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TYPICAL APPLICATIO
5V Regulator
VIN
VOUT
4
0.001µF
10µF
SHDN
3
SHUTDOWN
FB
GND
1
0.10
1
1M
+
2
25µF
1M
1120 TA01
0.01
0.1
10
100
1
OUTPUT CURRENT (mA)
SUPPLY CURRENT (mA)
LT1120
+
10
5V
DROPOUT VOLTAGE (V)
5
VIN > 5.2V
IQ = 40µA
Dropout Voltage and Supply Current
1.00
0.1
1000
1120 TA02
1
LT1120
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ABSOLUTE
AXI U RATI GS
(Note 1)
Input Voltage ........................................................... 36V
NPN Collector Voltage ............................................. 36V
Output Short-Circuit Duration .......................... Indefinite
Power Dissipation ............................... Internally Limited
Operating Temperature Range
LT1120C ................................................ 0°C to 100°C
LT1120I ................................................ – 40 to 100°C
Storage Temperature Range ................. – 65°C to 150°C
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PACKAGE/ORDER I FOR ATIO
TOP VIEW
GND 1
8
–INPUT
FB 2
7
COMPOUT
SHDN 3
6
REF
VOUT 4
5
VIN
J8 PACKAGE
8-LEAD CERDIP
LT1120CJ8
LT1120CN8
LT1120CS8
LT1120IN8
LT1120IS8
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART MARKING
TJMAX = 150°C, θJA = 100°C/W (J)
TJMAX = 110°C, θJA = 130°C/W (N)
TJMAX = 110°C, θJA = 150°C/W (S)
TOP VIEW
ORDER PART
NUMBER
ORDER PART
NUMBER
–INPUT
8
GND 1
7 COMPOUT
LT1120CH
6 REF
FB 2
SHDN 3
4
5 VIN
VOUT
H PACKAGE
8-LEAD TO-5 METAL CAN
TJMAX = 150°C, θJA = 150°C/W, θJC = 45°C/W
1120
1120I
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. Tj = 25°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference Voltage
4.5V ≤ VIN ≤ 36V
2.46
2.50
2.54
V
Line Regulation
4.5V ≤ VIN ≤ 36V
0.01
0.015
%/V
Load Regulation
–2mA ≤ IREF ≤ 2mA, VIN = 12V
0.3
0.6
Reference
%
Output Source Current
VIN = 5V
2
4
mA
Output Sink Current
VIN = 5V
2
4
mA
1
%
Temperature Stability
Regulator
Supply Current
VIN = 6V, IOUT ≤ 100µA
VIN = 36V, IOUT ≤ 100µA
VIN = 12V, IOUT = 125mA
Output Current
(VIN – VOUT) ≥ 1V, VIN ≥ 6V
Load Regulation
(VIN – VOUT) ≥ 1V, VIN ≥ 6V
Line Regulation
Dropout Voltage
Feedback Sense Voltage
VIN = 12V
80
100
20
125
µA
µA
mA
mA
0.2
0.5
6V ≤ VIN ≤ 36V
0.01
0.015
%/V
IOUT = 100µA
IOUT = 125mA
0.02
0.4
0.05
0.65
V
V
2.5
2.56
V
0.4
V
Shutdown Pin Voltage
2.44
Normal
VOUT ≤ 0.5V
2
45
75
11
Shutdown
2.2
1.4
%
V
LT1120
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. Tj = 25°C
PARAMETER
CONDITIONS
Shutdown Pin Current
VIN = 1.4V
MIN
TYP
MAX
UNITS
µA
25
Feedback Bias Current
15
40
nA
Minimum Load Current
VIN = 36V
1
5
µA
Short-Circuit Current
VIN = 36V
300
400
mA
Comparator
Offset Voltage
VIN = 36V
3
7
mV
Bias Current
VIN = 36V (Note 2)
15
40
nA
Gain
∆VOUT = 29V, RL = 20k
2000
10000
V/V
Power Supply Rejection
4.5V ≤ VS ≤ 36V
80
96
dB
Output Sink Current
VIN = 4.5V
10
18
mA
Saturation Voltage
IOUT = 1mA
0.4
Input Voltage Range
0
Response Time
0.6
V
VIN – 1
V
µs
5
Leakage Current
µA
2
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
2.40
2.50
2.55
V
Reference
Reference Voltage
4.5V ≤ VIN ≤ 36V
●
Line Regulation
4.5V ≤ VIN ≤ 36V
●
0.01
0.02
%/V
Load Regulation
– 2mA ≤ IREF ≤ 2mA, VIN = 12V
●
0.4
0.8
%
Output Source Current
VIN = 5V
●
2
mA
Output Sink Current
VIN = 5V
●
2
mA
Supply Current
VIN = 6V, IOUT ≤ 100µA
VIN = 36V, IOUT ≤ 100µA
VIN = 12V, IOUT = 125mA
●
●
●
Output Current
(VIN – VOUT) ≥ 1V, VIN ≥ 6V
●
Load Regulation
(VIN – VOUT) ≥ 1V, VIN ≥ 6V
●
1
Line Regulation
6V ≤ VIN ≤ 36V
●
0.02
%/V
Dropout Voltage
IOUT = 100µA
IOUT = 125mA
●
●
0.06
0.85
V
V
Feedback Sense Voltage
VIN = 12V
●
2.57
V
50
nA
Regulator
Feedback Bias Current
65
85
11
125
2.38
VIN = 36V
●
Short-Circuit Current
VIN = 36V
●
µA
µA
mA
mA
2.5
●
Minimum Load Current
95
100
20
300
%
50
µA
400
mA
3
LT1120
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Comparator
Offset Voltage
●
Bias Current
VIN = 36V (Note 2)
●
Gain
∆VOUT = 29V, RL = 20k
●
1000
Output Sink Current
VIN = 4.5V (Note 3)
●
5
Leakage Current
VIN = 36V
●
Note 1: Absolute Maximum Ratings are those values beyond which the life
a device may be impaired.
15
10
mV
60
nA
V/V
10
mA
µA
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Note 2: TA > 85°C, I bias maximum is 100nA.
Note 3: For TA ≤ – 40°C output current sink drops to 2.5mA.
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TYPICAL PERFOR A CE CHARACTERISTICS
Regulator Load Regulation
Supply Current
0.3
350
TJ = –55°C
TJ = –55°C TO 125°C
TJ = 25°C
0.1
0
TJ = 125°C
–0.1
SHORT-CIRCUIT CURRENT (mA)
0.2
SUPPLY CURRENT (mA)
OUTPUT VOLTAGE CHANGE (%)
Regulator Short-Circuit Current
100
10
1
0.1
–0.2
PRELOAD = 100µA
–0.3
0.1
10
100
1
OUTPUT CURRENT (mA)
0.01
0.1
1000
200
150
100
CURRENT LIMIT TIED TO GROUND
50
150
Regulator Ripple Rejection
70
100
∆VOUT = 100mV
RIPPLE REJECTION (dB)
MINIMUM LOAD CURRENT (µA)
65
0.1
10
IOUT = 100mA
60
55
IOUT = 10mA
50
IOUT = 1mA
45
40
VIN = 10VDC, 1VP–P
VOUT = 5V
COUT = 10µF
35
30
1
10
100
1000
1
REGULATOR OUTPUT CURRENT (mA)
1120 G04
4
30
70
110
TEMPERATURE (°C)
1120 G03
Regulator Minimum Load Current
1
0.01
0.1
–10
1120 G02
Dropout Voltage
REGULATOR INPUT-OUTPUT DIFFERENTIAL (V)
250
0
–50
10
100
1000
1
REGULATOR OUTPUT CURRENT (mA)
1120 G01
300
70
80
90
100 110 120 130 140 150
TEMPERATURE (°C)
1120 G05
10
100
1k
10k
RIPPLE FREQUENCY (Hz)
100k
1120 G06
LT1120
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TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current
Supply Current at Dropout
10
10
TJ = –55°C TO 125°C
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
IOUT = 100mA
1
IOUT = 10mA
0.1
IOUT = 1mA
IOUT = 100mA
1
IOUT = 10mA
0.1
IOUT = 1mA
VOUT = 5V
TJ = –55°C TO 125°C
0.01
0.01
1
5
10
15
20
25
REGULATOR INPUT-OUTPUT DIFFERENTIAL (V)
1
0.1
0.2
0.3
0.4
0.5
0.6
REGULATOR INPUT-OUTPUT DIFFERENTIAL (V)
1120 G07
1120 G08
Feedback Pin Current
4
40
3
35
FEEDBACK CURRENT (nA)
REFERENCE VOLTAGE CHANGE (mV)
Reference Regulation
2
1
0
–1
–2
30
TJ = –55°C
25
20
TJ = 25°C
15
10
TJ = 125°C
5
–3
–4
–1.5
–1.0 –0.5
0
0.5
1.0
REFERENCE OUTPUT CURRENT (mA)
0
0.1
1.5
1
10
100
1000
REGULATOR OUTPUT CURRENT (mA)
1120 G11
1120 G09
LT1120 Turn-On Characteristic
5.5
0.1
VIN = 15V
VOUT = 5V
0
–0.1
OUTPUT
CURRENT (mA)
VOUT = 5V
5.0
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE
CHANGE (%)
Regulator Thermal Regulation
50
4.5
NO LOAD
RL = 500Ω
4.0
3.5
3.0
2.5
2.0
RL = 50Ω
0
0
0
20 40 60 80 100 120 140 160 180
TIME (ms)
1120 G12
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
7
8
1120 G13
5
LT1120
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PI FU CTIO S
GND (Pin 1): Ground.
VIN (Pin 5): Input Supply. Bypass with a 10µF capacitor.
Must always be more positive than ground.
FB (Pin 2): Feedback. This is the feedback point of the
regulator. 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.
REF (Pin 6): 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.
COMPOUT (Pin 7): Comparator Output. May be connected to any voltage from ground to 36V more positive
than ground (operates above VIN). Short-circuit protected.
SHDN (Pin 3): Shutdown. A logic 1 shuts off the main
regulator. Caution: noise or leakage into the shutdown pin
can affect output voltage.
– INPUT (Pin 8): Comparator Input. Inverting comparator
input.
VOUT (Pin 4): Regulator Output. Main output, requires a
10µF output capacitor. Can be shorted to VIN or ground
without damaging the device.
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BLOCK DIAGRA
REF
6
VIN 5
COMPOUT 7
50k
+
–
4 VOUT
REF
2.5V
2 FB
60k
3 SHDN
1 GND
1120 BD
8
–INPUT
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APPLICATIO S I FOR ATIO
The LT1120 is especially suited for micropower system
applications. For example, the comparator section of the
LT1120 may be used as a battery checker to provide an
indication of low battery. Another type of system application for the LT1120 would be to generate the equivalent of
split supplies off of a single power input. The regulator
section provides regulated output voltage and the reference, which can both source and sink current, is then an
artificial system ground providing a split supply for the
system.
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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. 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 off of a
higher input voltage.
LT1120
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APPLICATIO S I FOR ATIO
Reference
Overload Protection
Internal to the LT1120 is a 2.5V trimmed class B output
reference. The reference was designed to be able to source
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 increases. It is sometimes desirable to decrease the AC
output impedance by placing an output capacitor on them.
The reference in the LT1120 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
the reference line can have 20Ω placed in series with it and
then a capacitor to ground. This is shown in Figure 1. Other
than placing large capacitive loads on the reference, no
other precautions are necessary and the reference is
stable with nominal stray capacitances.
The main regulator in the LT1120 is current limited at
approximately 250mA. The current limit is stable with both
input voltage and temperature.
Like most other IC regulators, a minimum load is required
on the output of the LT1120 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 must be large
enough to absorb all the leakage current of the pass
transistor at the maximum operating temperature. It also
effects the transient response; low output currents have
long recovery times from load transients. At high operating temperatures the minimum load current increases and
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.
Frequency Compensation
REF
6
REF
6
OUTPUT
20Ω
20Ω
+
OR
OUTPUT
+
10µF
10µF
1120 F01
Figure 1. Bypassing Reference
The LT1120 is frequency compensated by a dominant pole
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 ensure 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 LT1120. Also, a feedback
capacitor minimizes noise pickup and improves ripple
rejection.
With the large dynamic operating range of the output
current, 10000:1, frequency response changes widely.
Low AC impedance capacitors are needed to insure stability. While solid tantalum are best, aluminum electrolytics
can be used but larger capacitor values may be needed.
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LT1120
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TYPICAL APPLICATIO S
Regulator with Output Voltage Monitor
5
5V
VIN
VOUT
4
VOUT
5V
LT1120
500k
LOGIC
0.001µF
–
7
98k
–INPUT 8
+
+
LOGIC
OUTPUT
2k
FB
REF
6
10µF
2
GND
100k
1
1120 TA03
LOGIC OUTPUT GOES LOW WHEN VOUT DROPS BY 100mV
1A Low Dropout Regulator
Compensating the Comparator as an Op Amp
VIN
6
8
50µA
+
7
2.2k
–
AT Av = 100,
SLEW RATE = +0.05V/µs
–6V/µs
1M
MJE2955
5
VIN
VOUT
4
*
10k*
LT1120
R2
R1
FB
GND
1
C1
C2
VOUT
5V
100k
0.001µF
+
2
150Ω*
220µF†
100k
1120 TA04
Av
1
10
100
8
R1
33Ω
100Ω
10k
C1
0.1µF
0.047µF
0.002µF
C2
0.001µF
—
—
R2
—
100k
10k
1120 TA05
* FOR CURRENT LIMIT ≈ 1.5A
†
MUST HAVE LOW ESR. SEVERAL 100µF CAPACITORS CAN BE PARALLELED.
LT1120
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TYPICAL APPLICATIO S
Regulator with Improved Transient Response
5V Regulator
5
VIN > 5.2V
IQ = 40µA
VIN
VOUT
4
5V
0.001µF
LT1120
+
10µF
FB
5
VIN > 5.2V
VIN
VOUT
1M
5V
0.001µF
LT1120
+
2
4
FB
25µF
GND
+
25µF
0.001µF
GND
1M
1
1M
2
1
22k
1120 TA06
1M
1120 TA07
Battery-Backup Regulator
VOUT
5V
5
BATTERY
INPUT
VIN
VOUT
4
4
+
0.001µF
LT1120
FB
1M
10µF
GND
1
VIN
MAIN
POWER
INPUT
5
LT1120
2
2
VOUT
FB
GND
1
50k
1M
INTERNAL PARASITIC
DIODES OF LT1120
VIN
1120 TA08
VOUT
5V Regulator with Feedback Shutdown
VIN > 5.2V
IQ = 40µA
5
VIN
VOUT
4
+
0.001µF
LT1120
FB
5V
OUT
10µF
1M
2
GND
1
1M
2N3904*
LOGIC
INPUT
NC
* TRANSISTOR USED BECAUSE OF LOW LEAKAGE CHARACTERISTICS.
TO TURN OFF THE OUTPUT OF THE LT1120 FORCE FB (PIN 2) > 2.5V.
1120 TA09
9
R1
25Ω
Q7
Q6
R36
60k
Q8
Q9
R2
50k
Q12
Q10
R37
110.8k
R3
50k
Q11
8
–INPUT
Q17 Q18
Q15 Q16
Q14
R35
42k
R6
3k
Q21
Q19
R7
6.8k
C1
10pF
Q20
Q22
Q23
15k
281k
C2
25pF
R11
15k
Q28
R14
15k
Q32
Q27
Q31
R10
75k
Q63
Q30
Q26
Q62
R38
20k
Q61
Q60
Q24
Q25
R8
40k
Q34
Q33
R15
80k
Q35
R8
100k
R16
6k
C3
10pF
Q38
R17
100Ω
Q29
R19
40k
R18
15k
Q36
FB
2
Q41
Q39
Q59
Q37
Q40
R22
30k
125k
125k
R34
60k
100pF
SHDN
3
Q42
R23
30k
R26
15k
Q43
C5
100pF
Q45
R24
390k
Q47
R28
2k
R27
15k
Q46
Q44
Q51
C6
100pF
R29
5Ω
Q48
Q52
Q54
100pF
Q49
R30
2k
Q55
R33
47k
1120 Schem
R32
2k
R31
10Ω
1
Q56
GND
138.3k
VOUT
4
Q58
5
VIN
SCHE ATIC DIAGRA
W
W
10
Q5
COMPOUT
7
Q2
Q13
R4
42k
REF
6
LT1120
LT1120
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PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
H Package
8-Lead TO-5 Metal Can (0.200 PCD)
(LTC DWG # 05-08-1320)
0.335 – 0.370
(8.509 – 9.398)
DIA
0.305 – 0.335
(7.747 – 8.509)
0.027 – 0.045
(0.686 – 1.143)
45°TYP
PIN 1
0.028 – 0.034
(0.711 – 0.864)
0.040
(1.016)
MAX
0.050
(1.270)
MAX
SEATING
PLANE
GAUGE
PLANE
0.010 – 0.045*
(0.254 – 1.143)
0.200
(5.080)
TYP
0.165 – 0.185
(4.191 – 4.699)
REFERENCE
PLANE
0.110 – 0.160
(2.794 – 4.064)
INSULATING
STANDOFF
0.500 – 0.750
(12.700 – 19.050)
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND 0.045" BELOW THE REFERENCE PLANE
0.016 – 0.024
**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS
(0.406 – 0.610)
0.016 – 0.021**
(0.406 – 0.533)
H8(TO-5) 0.200 PCD 1197
J8 Package
8-Lead CERDIP (Narrow 0.300, Hermetic)
(LTC DWG # 05-08-1110)
0.200
(5.080)
MAX
0.300 BSC
(0.762 BSC)
0.015 – 0.060
(0.381 – 1.524)
0.008 – 0.018
(0.203 – 0.457)
0.005
(0.127)
MIN
0.405
(10.287)
MAX
8
6
CORNER LEADS OPTION
(4 PLCS)
5
0.025
(0.635)
RAD TYP
0° – 15°
0.045 – 0.068
(1.143 – 1.727)
2
3
0.045 – 0.068
(1.143 – 1.727)
FULL LEAD
OPTION
4
0.125
3.175
0.100 ± 0.010 MIN
(2.540 ± 0.254)
0.014 – 0.026
(0.360 – 0.660)
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD
OPTION
0.220 – 0.310
(5.588 – 7.874)
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NOTE: LEAD DIMENSIONS APPLY
TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
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J8 1197
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.300 – 0.325
(7.620 – 8.255)
0.009 – 0.015
(0.229 – 0.381)
(
+0.035
0.325 –0.015
+0.889
8.255
–0.381
)
0.045 – 0.065
(1.143 – 1.651)
0.130 ± 0.005
(3.302 ± 0.127)
0.065
(1.651)
TYP
0.100 ± 0.010
(2.540 ± 0.254)
0.400*
(10.160)
MAX
8
7
6
5
1
2
3
4
0.255 ± 0.015*
(6.477 ± 0.381)
0.125
(3.175) 0.020
MIN
(0.508)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
N8 1197
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LT1120
U
TYPICAL APPLICATIO
Current Limited 1A Regulator
0.5Ω*
VIN
2.2k
MJE2955
2N3906*
5
VIN
VOUT
5V
AT 1A
VOUT 4
0.22µF
LT1120
FB
100k
+
2
220µF†
GND
270Ω
1
100k
1120 TA10
* SETS CURRENT LIMIT BUT INCREASES DROPOUT VOLTAGE BY 0.5V.
†
MUST HAVE LOW ESR. SEVERAL 100µF CAPACITORS CAN BE PARALLELED.
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
8
7
6
5
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
0.050
(1.270)
TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
SO8 0996
1
2
3
4
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1121
150mA Micropower Low Dropout Regulator
0.4V Dropout Voltage, Includes Shutdown
LT1521
300mA Mircopower Low Dropout Regulator
Lowest IQ Low Dropout Regulator
LT1761
Micropower Low Noise, Low Dropout Regulator
SOT-23, 20µVRMS Noise, 20µA IQ
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com
1120b LT/TP 0499 2K REV B • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1989