LT1762 Series
150mA, Low Noise, LDO
Micropower Regulators
FEATURES
DESCRIPTION
Low Noise: 20µVRMS (10Hz to 100kHz)
nn Low Quiescent Current: 25µA
nn Wide Input Voltage Range: 1.8V to 20V
nn Output Current: 150mA
nn Very Low Shutdown Current: < 1µA
nn Low Dropout Voltage: 270mV
nn No Protection Diodes Needed
nn Fixed Output Voltages: 2.5V, 3V, 3.3V, 5V
nn Adjustable Output from 1.22V to 20V
nn Stable with 2.2µF Output Capacitor
nn Stable with Aluminum, Tantalum or Ceramic
Capacitors
nn Reverse Battery Protection
nn No Reverse Current
nn Overcurrent and Overtemperature Protected
nn 8-Lead MSOP Package
The LT®1762 series are micropower, low noise, low
dropout regulators. The devices are capable of supplying 150mA of output current with a dropout voltage of
270mV. Designed for use in battery-powered systems, the
low 25µA quiescent current makes them an ideal choice.
Quiescent current is well controlled; it does not rise in
dropout as it does with many other regulators.
nn
A key feature of the LT1762 regulators is low output noise.
With the addition of an external 0.01µF bypass capacitor,
output noise drops to 20µVRMS over a 10Hz to 100kHz
bandwidth. The LT1762 regulators are stable with output
capacitors as low as 2.2µF. Small ceramic capacitors can
be used without the series resistance required by other
regulators.
Internal protection circuitry includes reverse battery protection, current limiting, thermal limiting and reverse current protection. The parts come in fixed output voltages
of 2.5V, 3V, 3.3V and 5V, and as an adjustable device
with a 1.22V reference voltage. The LT1762 regulators
are available in the 8-lead MSOP package.
APPLICATIONS
Cellular Phones
Battery-Powered Systems
nn Frequency Synthesizers
nn Noise-Sensitive Instrumentation Systems
nn
nn
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
3.3V Low Noise Regulator
IN
1μF
OUT
+
SENSE
LT1762-3.3
SHDN
BYP
GND
1762 TA01a
400
3.3V AT 150mA
20μVRMS NOISE
350
10μF
0.01μF
DROPOUT VOLTAGE (mV)
VIN
3.7V TO
20V
Dropout Voltage
300
250
200
150
100
50
0
0
20
40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
1762 TA01b
Rev B
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1
LT1762 Series
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
(Note 1)
IN Pin Voltage..........................................................±20V
OUT Pin Voltage.......................................................±20V
Input to Output Differential Voltage.........................±20V
SENSE Pin Voltage ................................................. ±20V
ADJ Pin Voltage ....................................................... ±7V
BYP Pin Voltage......................................................±0.6V
SHDN Pin Voltage .................................................. ±20V
Output Short-Circuit Duration ......................... Indefinite
Operating Junction Temperature Range
(Note 2).............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
TOP VIEW
OUT
SENSE/ADJ*
BYP
GND
1
2
3
4
8
7
6
5
IN
NC
NC
SHDN
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 125°C/W
*PIN 2: SENSE FOR LT1762-2.5/LT1762-3/LT1762-3.3/LT1762-5 AND ADJ FOR LT1762
SEE THE APPLICATIONS SECTION.
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT1762EMS8#PBF
LT1762EMS8#TRPBF
LTHF
8-Lead Plastic MSOP
−40°C to 125°C
LT1762EMS8-2.5#PBF
LT1762EMS8-2.5#TRPBF LTHG
8-Lead Plastic MSOP
−40°C to 125°C
LT1762EMS8-3#PBF
LT1762EMS8-3#TRPBF
LTHH
8-Lead Plastic MSOP
−40°C to 125°C
LT1762EMS8-3.3#PBF
LT1762EMS8-3.3#TRPBF LTHJ
8-Lead Plastic MSOP
−40°C to 125°C
LT1762EMS8-5#PBF
LT1762EMS8-5#TRPBF
8-Lead Plastic MSOP
−40°C to 125°C
LTHK
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
2
Rev B
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LT1762 Series
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
PARAMETER
CONDITIONS
Minimum Operating Voltage
ILOAD = 150mA
Regulated Output Voltage
(Note 4)
LT1762-2.5
VIN = 3V, ILOAD = 1mA
3.5V < VIN < 20V, 1mA < ILOAD < 150mA
LT1762-3
l
VIN = 3.8V, ILOAD = 1mA
4.3V < VIN < 20V, 1mA < ILOAD < 150mA
LT1762-5
l
VIN = 3.5V, ILOAD = 1mA
4V < VIN < 20V, 1mA < ILOAD < 150mA
LT1762-3.3
MIN
TYP
MAX
1.8
2.3
V
2.475
2.5
2.525
V
2.435
2.5
2.565
V
2.970
3
3.030
V
2.925
3
3.075
V
3.267
3.3
3.333
V
3.220
3.3
3.380
V
4.950
5
5.050
V
4.875
5
5.125
V
1.208
1.22
1.232
V
1.190
l
l
VIN = 5.5V, ILOAD = 1mA
6V < VIN < 20V, 1mA < ILOAD < 150mA
l
UNITS
ADJ Pin Voltage
(Notes 3, 4)
LT1762
VIN = 2V, ILOAD = 1mA
2.22V < VIN < 20V, 1mA < ILOAD < 150mA
l
1.22
1.250
Line Regulation
LT1762-2.5
∆VIN = 3V to 20V, ILOAD = 1mA
l
1
5
mV
LT1762-3
∆VIN = 3.5V to 20V, ILOAD = 1mA
l
1
5
mV
LT1762-3.3
∆VIN = 3.8V to 20V, ILOAD = 1mA
l
1
5
mV
LT1762-5
∆VIN = 5.5V to 20V, ILOAD = 1mA
l
1
5
mV
l
1
5
mV
4
12
mV
25
mV
LT1762 (Note 3) ∆VIN = 2V to 20V, ILOAD = 1mA
Load Regulation
LT1762-2.5
VIN = 3.5V, ∆ILOAD = 1mA to 150mA
VIN = 3.5V, ∆ILOAD = 1mA to 150mA
LT1762-3
VIN = 4V, ∆ILOAD = 1mA to 150mA
VIN = 4V, ∆ILOAD = 1mA to 150mA
LT1762-3.3
4
l
VIN = 4.3V, ∆ILOAD = 1mA to 150mA
VIN = 4.3V, ∆ILOAD = 1mA to 150mA
LT1762-5
l
5
l
VIN = 6V, ∆ILOAD = 1mA to 150mA
VIN = 6V, ∆ILOAD = 1mA to 150mA
9
l
LT1762 (Note 3) VIN = 2.22V, ∆ILOAD = 1mA to 150mA
VIN = 2.22V, ∆ILOAD = 1mA to 150mA
Dropout Voltage
VIN = VOUT(NOMINAL)
(Notes 5, 6)
1
l
ILOAD = 1mA
0.09
ILOAD = 1mA
l
ILOAD = 10mA
0.15
ILOAD = 10mA
l
ILOAD = 50mA
0.21
ILOAD = 50mA
l
ILOAD = 150mA
GND Pin Current
VIN = VOUT(NOMINAL)
(Notes 5, 7)
0.27
V
15
mV
30
mV
17
mV
33
mV
25
mV
50
mV
6
mV
15
mV
0.15
V
0.19
V
0.21
V
0.25
V
0.27
V
0.31
V
0.33
V
0.40
V
ILOAD = 150mA
l
ILOAD = 0mA
l
25
65
µA
ILOAD = 1mA
l
70
120
µA
ILOAD = 10mA
l
350
500
µA
ILOAD = 50mA
l
1.3
1.8
mA
ILOAD = 150mA
l
4
7
mA
Rev B
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3
LT1762 Series
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
PARAMETER
CONDITIONS
MIN
Output Voltage Noise
COUT = 10µF, CBYP = 0.01µF, ILOAD = 150mA,
BW = 10Hz to 100kHz
ADJ Pin Bias Current
(Notes 3, 8)
Shutdown Threshold
VOUT = Off to On
l
VOUT = On to Off
l
TYP
MAX
20
0.25
UNITS
µVRMS
30
100
nA
0.8
2
V
0.65
V
SHDN Pin Current
(Note 9)
VSHDN = 0V
0.1
µA
VSHDN = 20V
1
µA
Quiescent Current in Shutdown
VIN = 6V, VSHDN = 0V
Ripple Rejection
VIN – VOUT = 1V (Avg), VRIPPLE = 0.5VP-P,
fRIPPLE = 120Hz, ILOAD = 150mA
Current Limit
VIN = 7V, VOUT = 0V
0.1
50
1
µA
65
dB
400
mA
VIN = VOUT(NOMINAL) + 1V, ∆VOUT = –0.1V
l
Input Reverse Leakage Current
VIN = –20V, VOUT = 0V
l
1
mA
Reverse Output Current
(Note 10)
LT1762-2.5
VOUT = 2.5V, VIN < 2.5V
10
20
µA
LT1762-3
VOUT = 3V, VIN < 3V
10
20
µA
LT1762-3.3
VOUT = 3.3V, VIN < 3.3V
10
20
µA
LT1762-5
VOUT = 5V, VIN < 5V
10
20
µA
5
10
µA
LT1762 (Note 3) VOUT = 1.22V, VIN < 1.22V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT1762 regulators are tested and specified under pulse
load conditions such that TJ ≈ TA. The LT1762 is 100% tested at 25°C.
Performance at –40°C and 125°C is assured by design, characterization
and correlation with statistical process controls.
Note 3: The LT1762 (adjustable version) is tested and specified for these
conditions with the ADJ pin connected to the OUT pin.
Note 4: Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply
for all possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range must be
limited. When operating at maximum output current, the input voltage
range must be limited.
4
160
mA
Note 5: To satisfy requirements for minimum input voltage, the LT1762
(adjustable version) is tested and specified for these conditions with an
external resistor divider (two 250k resistors) for an output voltage of
2.44V. The external resistor divider will add a 5µA DC load on the output.
Note 6: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout, the
output voltage will be equal to: VIN – VDROPOUT.
Note 7: GND pin current is tested with VIN = VOUT(NOMINAL) and a current
source load. This means the device is tested while operating in its dropout
region. This is the worst-case GND pin current. The GND pin current will
decrease slightly at higher input voltages.
Note 8: ADJ pin bias current flows into the ADJ pin.
Note 9: SHDN pin current flows into the SHDN pin.
Note 10: Reverse output current is tested with the IN pin grounded and the
OUT pin forced to the rated output voltage. This current flows into the OUT
pin and out the GND pin.
Rev B
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LT1762 Series
TYPICAL PERFORMANCE CHARACTERISTICS
Guaranteed Dropout Voltage
450
450
400
400
350
TJ = 125°C
300
250
200
TJ = 25°C
150
100
TJ = 25°C
200
150
100
0
60 80 100 120 140 160
LOAD CURRENT (mA)
TJ = 125°C
250
50
40
450
300
0
20
= TEST POINTS
350
50
0
2.54
0
20
2.53
VSHDN = VIN
20
15
10
5
60 80 100 120 140 160
LOAD CURRENT (mA)
0
25
50
75
100
2.51
2.50
2.49
2.48
0
25
50
75
100
3.000
2.985
2.970
2.940
–50 –25
125
3.300
3.285
3.270
3.255
75
100
125
TEMPERATURE (°C)
25
50
75
125
1762 G06
1.240
IL = 1mA
1.235
5.050
5.025
5.000
4.975
4.950
4.900
–50 –25
100
LT1762
ADJ Pin Voltage
4.925
50
0
TEMPERATURE (°C)
ADJ PIN VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.315
25
3.015
LT1762-5
Output Voltage
5.075
125
3.030
1762 G05
5.100
100
IL = 1mA
TEMPERATURE (°C)
3.330
50
25
0
75
TEMPERATURE (°C)
2.955
2.46
–50 –25
125
IL = 1mA
0
IL = 1mA
100
3.045
2.52
LT1762-3.3
Output Voltage
3.240
–50 –25
IL = 10mA
150
3.060
1762 G04
3.345
200
LT1762-3
Output Voltage
IL = 1mA
TEMPERATURE (°C)
3.360
IL = 50mA
1762 G03
2.47
0
–50 –25
250
0
–50 –25
40
OUTPUT VOLTAGE (V)
VIN = 6V
RL = ∞, IL = 0 (LT1762-2.5/-3/-3.3/-5)
RL = 250k, IL = 5μA (LT1762)
25
IL = 150mA
300
LT1762-2.5
Output Voltage
OUTPUT VOLTAGE (V)
QUIESCENT CURRENT (μA)
30
350
1762 G02
Quiescent Current
35
400
50
1762 G01
40
Dropout Voltage
500
DROPOUT VOLTAGE (mV)
500
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
Typical Dropout Voltage
500
IL = 1mA
1.230
1.225
1.220
1.215
1.210
1.205
0
25
50
75
100
125
TEMPERATURE (°C)
1762 G07
1.200
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
1762 G08
1762 G09
Rev B
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5
LT1762 Series
TYPICAL PERFORMANCE CHARACTERISTICS
LT1762-2.5
Quiescent Current
LT1762-3
Quiescent Current
400
400
TJ = 25°C
RL = ∞
250
200
150
100
VSHDN = VIN
0
1
2
VSHDN = 0V
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
300
250
200
150
100
VSHDN = VIN
50
0
10
0
1
2
VSHDN = 0V
3 4 5 6 7
INPUT VOLTAGE (V)
8
1762 G10
200
VSHDN = VIN
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
VSHDN = VIN
20
TJ = 25°C
RL = 250k
15
10
0
10
600
400
0
2
4
300
200
RL = 3k
IL = 1mA*
100
0
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
RL = 132Ω
IL = 25mA*
600
400
200
300
200
9
10
RL = 2.5k
IL = 1mA*
0
1
2
700
RL = 3.3k
IL = 1mA*
100
8
RL = 250Ω
IL = 10mA*
3 4 5 6 7
INPUT VOLTAGE (V)
8
0
0
1
2
9
10
800
RL = 330Ω
IL = 10mA*
300
10
1762 G15
TJ = 25°C
VIN = VSHDN
*FOR VOUT = 3.3V
500
400
9
LT1762-5
GND Pin Current
3 4 5 6 7
INPUT VOLTAGE (V)
RL = 200Ω
IL = 25mA*
600
TJ = 25°C
VIN = VSHDN
*FOR VOUT = 5V
500
400
300
200
RL = 5k
IL = 1mA*
100
8
1762 G16
6
500
0
6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
700
RL = 300Ω
IL = 10mA*
8
RL = 100Ω
IL = 25mA*
100
VSHDN = 0V
800
TJ = 25°C
VIN = VSHDN
*FOR VOUT = 3V
500
3 4 5 6 7
INPUT VOLTAGE (V)
TJ = 25°C
VIN = VSHDN
*FOR VOUT = 2.5V
600
LT1762-3.3
GND Pin Current
GND PIN CURRENT (μA)
GND PIN CURRENT (μA)
RL = 120Ω
IL = 25mA*
2
1762 G14
LT1762-3
GND Pin Current
700
1
700
1762 G13
800
0
VSHDN = 0V
LT1762-2.5
GND Pin Current
GND PIN CURRENT (μA)
1
VSHDN = VIN
1762 G12
5
VSHDN = 0V
0
100
0
10
GND PIN CURRENT (μA)
QUIESCENT CURRENT (μA)
QUIESCENT CURRENT (μA)
250
50
150
800
25
300
100
200
50
30
TJ = 25°C
RL = ∞
150
250
LT1762
Quiescent Current
400
0
9
300
1762 G11
LT1762-5
Quiescent Current
350
TJ = 25°C
RL = ∞
350
QUIESCENT CURRENT (μA)
300
50
400
TJ = 25°C
RL = ∞
350
QUIESCENT CURRENT (μA)
QUIESCENT CURRENT (μA)
350
0
LT1762-3.3
Quiescent Current
9
10
1762 G17
0
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
RL = 500Ω
IL = 10mA*
8
9
10
1762 G18
Rev B
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LT1762 Series
TYPICAL PERFORMANCE CHARACTERISTICS
800
600
RL = 48.8Ω
IL = 25mA*
500
400
RL = 122Ω
IL = 10mA*
300
200
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
4.0
3.5
RL = 25Ω
IL = 100mA*
2.0
1.5
9
0
10
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
5.0
8
2.5
RL = 33Ω
IL = 100mA*
2.0
1.5
1.0
0
0
1
3 4 5 6 7
INPUT VOLTAGE (V)
2
4.0
3.0
9
RL = 50Ω
IL = 100mA*
2.0
1.5
0
10
RL = 100Ω
IL = 50mA*
SHDN PIN THRESHOLD (V)
GND PIN CURRENT (mA)
0.9
3.0
2.5
2.0
1.5
1.0
0.5
0
20
40
60 80 100 120 140 160
OUTPUT CURRENT (mA)
8
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
4.0
RL = 8.07Ω
IL = 150mA*
3.5
3.0
RL = 12.2Ω
IL = 100mA*
2.5
2.0
RL = 24.4Ω
IL = 50mA*
1.5
0
10
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
10
9
1762 G24
SHDN Pin Threshold (Off-to-On)
1.0
IL = 1mA
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0
–50 –25
10
9
0.5
0.8
0.7
IL = 150mA
0.6
0.5
IL = 1mA
0.4
0.3
0.2
0.1
0.1
0
3 4 5 6 7
INPUT VOLTAGE (V)
TJ = 25°C
VIN = VSHDN
*FOR VOUT = 1.22V
1.0
SHDN PIN THRESHOLD (V)
VIN = VOUT(NOMINAL) + 1V
3.5
2
1762 G21
SHDN Pin Threshold (On-to-Off)
1.0
4.0
1
1762 G23
GND Pin Current vs ILOAD
4.5
0
4.5
2.5
0.5
8
RL = 60Ω
IL = 50mA*
5.0
1762 G22
5.0
1.5
LT1762
GND Pin Current
RL = 33.3Ω
IL = 150mA*
3.5
1.0
RL = 66Ω
IL = 50mA*
0.5
RL = 30Ω
IL = 100mA*
2.0
0
10
GND PIN CURRENT (mA)
RL = 22Ω
IL = 150mA*
3.0
9
TJ = 25°C
VIN = VSHDN
*FOR VOUT = 5V
4.5
GND PIN CURRENT (mA)
GND PIN CURRENT (mA)
3.5
2.5
LT1762-5
GND Pin Current
TJ = 25°C
VIN = VSHDN
*FOR VOUT = 3.3V
4.0
RL = 20Ω
IL = 150mA*
3.0
1762 G20
LT1762-3.3
GND Pin Current
4.5
3.5
0.5
1762 G19
5.0
4.0
1.0
RL = 50Ω
IL = 50mA*
0
TJ = 25°C
VIN = VSHDN
*FOR VOUT = 3V
4.5
2.5
0.5
8
5.0
RL = 16.7Ω
IL = 150mA*
3.0
1.0
RL = 1.22k
IL = 1mA*
100
LT1762-3
GND Pin Current
TJ = 25°C
VIN = VSHDN
*FOR VOUT = 2.5V
4.5
GND PIN CURRENT (mA)
GND PIN CURRENT (μA)
5.0
TJ = 25°C
VIN = VSHDN
*FOR VOUT = 1.22V
700
0
LT1762-2.5
GND Pin Current
GND PIN CURRENT (mA)
LT1762
GND Pin Current
50
25
0
75
TEMPERATURE (°C)
100
1762 G25
125
1762 G26
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
1762 G27
Rev B
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7
LT1762 Series
TYPICAL PERFORMANCE CHARACTERISTICS
SHDN Pin Input Current
SHDN Pin Input Current
1.6
SHDN PIN INPUT CURRENT (μA)
1.0
0.8
0.6
0.4
0.2
0
1
2
3 4 5 6 7 8
SHDN PIN VOLTAGE (V)
9
120
1.2
1.0
0.8
0.6
0.4
0
–50 –25
10
0
25
50
75
100
Current Limit
SHORT-CIRCUIT CURRENT (mA)
SHORT-CIRCUIT CURRENT (mA)
300
250
200
150
100
50
VIN = 7V
VOUT = 0V
400
350
300
250
200
150
100
0
–50 –25
7
6
20
15
LT1762-2.5/-3/-3.3/-5
10
5
0
–50 –25
LT1762
50
25
0
75
TEMPERATURE (°C)
100
50
20
0
125
100
125
LT1762
LT1762-3
30
LT1762-3.3
LT1762-5
0
1
2
3 4 5 6 7 8
OUTPUT VOLTAGE (V)
60
60
50
COUT = 10μF
30
IL = 150mA
VIN = VOUT(NOMINAL) +
1V + 50mVRMS RIPPLE
CBYP = 0
0
10
100
COUT = 2.2μF
1k
10k
FREQUENCY (Hz)
10
Input Ripple Rejection
70
20
9
1762 G33
70
40
125
LT1762-2.5
40
80
CBYP = 0.01μF
CBYP = 1000pF
50
CBYP = 100pF
40
30
20
IL = 150mA
VIN = VOUT(NOMINAL) +
1V + 50mVRMS RIPPLE
COUT = 10μF
10
100k
1M
1762 G35
1762 G34
8
60
80
10
50
25
0
75
TEMPERATURE (°C)
70
Input Ripple Rejection
RIPPLE REJECTION (dB)
REVERSE OUTPUT CURRENT (μA)
25
80
1762 G32
Reverse Output Current
VIN = 0V
VOUT = 1.22V (LT1762)
VOUT = 2.5V (LT1762-2.5)
VOUT = 3V (LT1762-3)
VOUT = 3.3V (LT1762-3.3)
VOUT = 5V (LT1762-5)
TJ = 25°C, VIN = 0V
CURRENT FLOWS
INTO OUTPUT PIN
VOUT = VSENSE
(LT1762-2.5/-3/-3.3/-5)
VOUT = VADJ (LT1762)
90
10
1762 G31
30
100
50
4
3
2
5
INPUT VOLTAGE (V)
100
Reverse Output Current
450
350
50
25
0
75
TEMPERATURE (°C)
1762 G30
Current Limit
400
1
40
0
–50 –25
125
500
VOUT = 0V
0
60
1762 G29
500
0
80
TEMPERATURE (°C)
1762 G28
450
100
20
0.2
REVERSE OUTPUT CURRENT (μA)
0
VSHDN = 20V
1.4
RIPPLE REJECTION (dB)
SHDN PIN INPUT CURRENT (μA)
1.2
ADJ PIN BIAS CURRENT (nA)
1.4
ADJ Pin Bias Current
140
0
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
1762 G36
Rev B
For more information www.analog.com
LT1762 Series
TYPICAL PERFORMANCE CHARACTERISTICS
LT1762
Minimum Input Voltage
66
2.25
64
62
60
58
0
IL = 150mA
1.75
1.50
IL = 1mA
1.25
1.00
0.75
0.50
75
100
0
–50 –25
125
50
25
0
75
TEMPERATURE (°C)
100
–10
LT1762-3.3
1
LT1762-2.5
LT1762-3
0.1
100k
1k
10k
FREQUENCY (Hz)
100
LT1762-5
–15
VIN = VOUT(NOMINAL) + 1V
∆IL = 1mA TO 150mA
–25
–50 –25
125
0
10
LT1762-3
80
60
LT1762
40
LT1762-2.5
20
0
10
CBYP = 1000pF
LT1762-5
CBYP = 100pF
LT1762
0.1
CBYP = 0.01μF
0.01
10
100
160
140
1k
10k
FREQUENCY (Hz)
COUT = 10μF
CBYP = 0
CBYP = 0.01μF
1000
100k
10000
LT1762-5
120
100
80
LT1762
60
40
LT1762-5
20
100
125
RMS Output Noise vs Load
Current (10Hz to 100kHz)
LT1762-3.3
100
100
1762 G41
COUT = 10μF
IL = 150mA
f = 10Hz TO 100kHz
LT1762-5
120
75
COUT = 10μF
IL = 150mA
1
RMS Output Noise vs Bypass
Capacitor
140
50
1762 G39
1762 G40
160
25
Output Noise Spectral Density
COUT = 10μF
IL = 150mA
LT1762
LT1762-3.3
1762 G38
Output Noise Spectral Density
CBYP = 0
LT1762-5
LT1762-2.5
TEMPERATURE (°C)
1762 G37
0.01
10
–5
–20
TEMPERATURE (°C)
10
LT1762-3
0.25
50
25
LT1762
0
2.00
OUTPUT NOISE SPECTRAL DENSITY (μV/√Hz)
52
–50 –25
VOUT = 1.22V
OUTPUT NOISE (μVRMS)
54
VIN = VOUT (NOMINAL) +
1V + 0.5VP-P RIPPLE
AT f = 120Hz
IL = 150mA
OUTPUT NOISE SPECTRAL DENSITY (μV/√Hz)
56
Load Regulation
5
LOAD REGULATION (mV)
2.50
MINIMUM INPUT VOLTAGE (V)
68
OUTPUT NOISE (μVRMS)
RIPPLE REJECTION (dB)
Ripple Rejection
0
0.01
CBYP (pF)
1762 G42
LT1762
0.1
10
100
1
LOAD CURRENT (mA)
1000
1762 G43
Rev B
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9
LT1762 Series
TYPICAL PERFORMANCE CHARACTERISTICS
LT1762-5
10Hz to 100kHz Output Noise
CBYP = 0
LT1762-5
10Hz to 100kHz Output Noise
CBYP = 100pF
VOUT
100μV/DIV
VOUT
100μV/DIV
1ms/DIV
1762 G44
1ms/DIV
COUT = 10μF
IL = 150mA
COUT = 10μF
IL = 150mA
LT1762-5
10Hz to 100kHz Output Noise
CBYP = 1000pF
LT1762-5
10Hz to 100kHz Output Noise
CBYP = 0.01µF
VOUT
100μV/DIV
VOUT
100μV/DIV
1ms/DIV
1762 G46
1ms/DIV
COUT = 10μF
IL = 150mA
1762 G47
COUT = 10μF
IL = 150mA
0.3
LT1762-5
Transient Response
CBYP = 0.01µF
VIN = 6V
CIN = 10μF
COUT = 10μF
0.2
0.1
0
–0.1
OUTPUT VOLTAGE
DEVIATION (V)
LT1762-5
Transient Response
CBYP = 0
OUTPUT VOLTAGE
DEVIATION (V)
1762 G45
VIN = 6V
CIN = 10μF
COUT = 10μF
0.04
0.02
0
–0.02
–0.2
–0.04
LOAD CURRENT
(mA)
LOAD CURRENT
(mA)
–0.3
150
100
50
0
0
400
800
1200
TIME (μs)
1600
2000
150
100
50
0
1762 G48
10
0
40
80
120
TIME (μs)
160
200
1762 G49
Rev B
For more information www.analog.com
LT1762 Series
PIN FUNCTIONS
OUT (Pin 1): Output. The output supplies power to the
load. A minimum output capacitor of 2.2µF is required
to prevent oscillations. Larger output capacitors will be
required for applications with large transient loads to limit
peak voltage transients. See the Applications Information
section for more information on output capacitance and
reverse output characteristics.
SENSE (Pin 2): Output Sense. For fixed voltage versions of the LT1762 (LT1762-2.5/LT1762-3/LT17623.3/LT1762-5), the SENSE pin is the input to the error
amplifier. Optimum regulation will be obtained at the point
where the SENSE pin is connected to the OUT pin of the
regulator. In critical applications, small voltage drops
are caused by the resistance (RP) of PC traces between
the regulator and the load. These may be eliminated by
connecting the SENSE pin to the output at the load as
shown in Figure 1 (Kelvin Sense Connection). Note that
the voltage drop across the external PC traces will add to
the dropout voltage of the regulator. The SENSE pin bias
current is 10µA at the nominal rated output voltage. The
SENSE pin can be pulled below ground (as in a dual supply system where the regulator load is returned to a negative supply) and still allow the device to start and operate.
ADJ (Pin 2): Adjust. For the adjustable LT1762, this is the
input to the error amplifier. This pin is internally clamped
to ±7V. It has a bias current of 30nA which flows into the
pin (see curve of ADJ Pin Bias Current vs Temperature
in the Typical Performance Characteristics). The ADJ pin
voltage is 1.22V referenced to ground and the output voltage range is 1.22V to 20V.
BYP (Pin 3): Bypass. The BYP pin is used to bypass the
reference of the LT1762 regulators to achieve low noise
performance from the regulator. The BYP pin is clamped
internally to ±0.6V (one VBE). A small capacitor from the
output to this pin will bypass the reference to lower the
output voltage noise. A maximum value of 0.01µF can
be used for reducing output voltage noise to a typical
20µVRMS over a 10Hz to 100kHz bandwidth. If not used,
this pin must be left unconnected.
GND (Pin 4): Ground.
SHDN (Pin 5): Shutdown. The SHDN pin is used to put
the LT1762 regulators into a low power shutdown state.
The output will be off when the SHDN pin is pulled low.
The SHDN pin can be driven either by 5V logic or opencollector logic with a pull-up resistor. The pull-up resistor is required to supply the pull-up current of the opencollector gate, normally several microamperes, and the
SHDN pin current, typically 1µA. If unused, the SHDN
pin must be connected to VIN. The device will be in low
power shutdown state if the SHDN pin is not connected.
IN (Pin 8): Input. Power is supplied to the device through
the IN pin. A bypass capacitor is required on this pin if
the device is more than six inches away from the main
input filter capacitor. In general, the output impedance
of a battery rises with frequency, so it is advisable to
include a bypass capacitor in battery-powered circuits. A
bypass capacitor in the range of 1µF to 10µF is sufficient.
The LT1762 regulators are designed to withstand reverse
voltages on the IN pin with respect to ground and the OUT
pin. In the case of a reverse input, which can happen if
a battery is plugged in backwards, the device will act as
if there is a diode in series with its input. There will be
no reverse current flow into the regulator and no reverse
voltage will appear at the load. The device will protect both
itself and the load.
8
VIN
+
IN
OUT
1
RP
LT1762
5
SHDN
SENSE
GND
+
2
LOAD
4
RP
1762 F01
Figure 1. Kelvin Sense Connection
Rev B
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11
LT1762 Series
APPLICATIONS INFORMATION
The LT1762 series are 150mA low dropout regulators
with micropower quiescent current and shutdown. The
devices are capable of supplying 150mA at a dropout
voltage of 270mV. Output voltage noise can be lowered
to 20µVRMS over a 10Hz to 100kHz bandwidth with
the addition of a 0.01µF reference bypass capacitor.
Additionally, the reference bypass capacitor will improve
transient response of the regulator, lowering the settling time for transient load conditions. The low operating quiescent current (25µA) drops to less than 1µA
in shutdown. In addition to the low quiescent current,
the LT1762 regulators incorporate several protection
features which make them ideal for use in battery-powered systems. The devices are protected against both
reverse input and reverse output voltages. In battery
backup applications where the output can be held up
by a backup battery when the input is pulled to ground,
the LT1762-X acts like it has a diode in series with its
output and prevents reverse current flow. Additionally,
in dual supply applications where the regulator load is
returned to a negative supply, the output can be pulled
below ground by as much as 20V and still allow the
device to start and operate.
Adjustable Operation
The adjustable version of the LT1762 has an output
voltage range of 1.22V to 20V. The output voltage is
set by the ratio of two external resistors as shown in
Figure 2. The device servos the output to maintain the
OUT
IN
VIN
LT1762
GND
R2
+
VOUT
ADJ
R1
1762 F02
⎛
R2 ⎞⎟
VOUT = 1.22V ⎜⎜ 1+
+ (I ADJ ) (R2 )
R1 ⎟⎠
⎝
V ADJ = 1.22V
I ADJ = 30nA AT 25°C
ADJ pin voltage at 1.22V referenced to ground. The current in R1 is then equal to 1.22V/R1 and the current in
R2 is the current in R1 plus the ADJ pin bias current. The
ADJ pin bias current, 30nA at 25°C, flows through R2
into the ADJ pin. The output voltage can be calculated
using the formula in Figure 2. The value of R1 should
be no greater than 250k to minimize errors in the output
voltage caused by the ADJ pin bias current. Note that in
shutdown the output is turned off and the divider current
will be zero. Curves of ADJ Pin Voltage vs Temperature
and ADJ Pin Bias Current vs Temperature appear in the
Typical Performance Characteristics section.
The adjustable device is tested and specified with the ADJ
pin tied to the OUT pin for an output voltage of 1.22V.
Specifications for output voltages greater than 1.22V will
be proportional to the ratio of the desired output voltage
to 1.22V: VOUT/1.22V. For example, load regulation for an
output current change of 1mA to 150mA is –1mV typical
at VOUT = 1.22V. At VOUT = 12V, load regulation is:
(12V/1.22V)(–1mV) = – 9.8mV
Bypass Capacitance and Low Noise Performance
The LT1762 regulators may be used with the addition
of a bypass capacitor from VOUT to the BYP pin to lower
output voltage noise. A good quality low leakage capacitor
is recommended. This capacitor will bypass the reference
of the regulator, providing a low frequency noise pole. The
noise pole provided by this bypass capacitor will lower the
output voltage noise to as low as 20µVRMS with the addition of a 0.01µF bypass capacitor. Using a bypass capacitor has the added benefit of improving transient response.
With no bypass capacitor and a 10µF output capacitor,
a 10mA to 150mA load step will settle to within 1% of
its final value in less than 100µs. With the addition of a
0.01µF bypass capacitor, the output will stay within 1%
for a 10mA to 150mA load step (see LT1762-5 Transient
Response in the Typical Performance Characteristics).
However, regulator start-up time is proportional to the size
of the bypass capacitor, slowing to 15ms with a 0.01µF
bypass capacitor and 10µF output capacitor.
OUTPUT RANGE = 1.22V TO 20V
Figure 2. Adjustable Operation
12
Rev B
For more information www.analog.com
LT1762 Series
APPLICATIONS INFORMATION
The LT1762 regulators are designed to be stable with a
wide range of output capacitors. The ESR of the output
capacitor affects stability, most notably with small capacitors. A minimum output capacitor of 2.2µF with an ESR of
3Ω or less is recommended to prevent oscillations. The
LT1762-X is a micropower device and output transient
response will be a function of output capacitance. Larger
values of output capacitance decrease the peak deviations
and provide improved transient response for larger load
current changes. Bypass capacitors, used to decouple
individual components powered by the LT1762-X, will
increase the effective output capacitor value. With larger
capacitors used to bypass the reference (for low noise
operation), larger values of output capacitors are needed.
For 100pF of bypass capacitance, 3.3µF of output capacitor is recommended. With a 330pF bypass capacitor or
larger, a 4.7µF output capacitor is recommended. The
shaded region of Figure 3 defines the range over which the
LT1762 regulators are stable. The minimum ESR needed
is defined by the amount of bypass capacitance used,
while the maximum ESR is 3Ω.
Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior across
temperature and applied voltage. The most common
dielectrics used are specified with EIA temperature characteristic codes of Z5U, Y5V, X5R and X7R. The Z5U and
Y5V dielectrics are good for providing high capacitances
in a small package, but they tend to have strong voltage
and temperature coefficients as shown in Figure 4 and
Figure 5. When used with a 5V regulator, a 16V 10µF Y5V
capacitor can exhibit an effective value as low as 1µF to
2µF for the DC bias voltage applied and over the operating
temperature range. The X5R and X7R dielectrics result in
more stable characteristics and are more suitable for use
as the output capacitor. The X7R type has better stability
across temperature, while the X5R is less expensive and
is available in higher values. Care still must be exercised
when using X5R and X7R capacitors; the X5R and X7R
codes only specify operating temperature range and maximum capacitance change over temperature. Capacitance
change due to DC bias with X5R and X7R capacitors
is better than Y5V and Z5U capacitors, but can still be
20
–40
–60
–100
Y5V
0
2
4
14
8
6
10 12
DC BIAS VOLTAGE (V)
16
1762 F04
Figure 4. Ceramic Capacitor DC Bias Characteristics
40
20
3.0
CHANGE IN VALUE (%)
3.5
STABLE REGION
2.5
ESR (Ω)
X5R
–20
–80
4.0
2.0
1.5
CBYP = 0
CBYP = 100pF
CBYP = 330pF
CBYP 3300pF
1.0
0.5
0
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
0
CHANGE IN VALUE (%)
Output Capacitance and Transient Response
1
–20
–40
Y5V
–60
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
–100
–50 –25
3
2
4 5 6 7 8 9 10
OUTPUT CAPACITANCE (μF)
50
25
75
0
TEMPERATURE (°C)
100
125
1762 F05
1762 F03
Figure 3. Stability
X5R
0
Figure 5. Ceramic Capacitor Temperature Characteristics
Rev B
For more information www.analog.com
13
LT1762 Series
APPLICATIONS INFORMATION
significant enough to drop capacitor values below appropriate levels. Capacitor DC bias characteristics tend to
improve as component case size increases, but expected
capacitance at operating voltage should be verified.
Voltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress,
similar to the way a piezoelectric accelerometer or microphone works. For a ceramic capacitor the stress can be
induced by vibrations in the system or thermal transients.
The resulting voltages produced can cause appreciable
amounts of noise, especially when a ceramic capacitor is
used for noise bypassing. A ceramic capacitor produced
Figure 6's trace in response to light tapping from a pencil.
VOUT
Table 1 lists thermal resistance for several different board
sizes and copper areas. All measurements were taken in
still air on 3/32" FR-4 board with one ounce copper.
COPPER AREA
TOPSIDE* BACKSIDE
500μV/DIV
1762 F06
Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor
Similar vibration induced behavior can masquerade as
increased output voltage noise.
Thermal Considerations
The power handling capability of the device will be limited
by the maximum rated junction temperature (125°C). The
power dissipated by the device will be made up of two
components:
1. Output current multiplied by the input/output voltage
differential: (IOUT)(VIN – VOUT), and
2. GND pin current multiplied by the input voltage:
(IGND)(VIN).
The GND pin current can be found by examining the
GND Pin Current curves in the Typical Performance
Characteristics. Power dissipation will be equal to the
sum of the two components listed above.
14
For surface mount devices, heat sinking is accomplished
by using the heat spreading capabilities of the PC board
and its copper traces. Copper board stiffeners and plated
through-holes can also be used to spread the heat generated by power devices.
Table 1. Measured Thermal Resistance
LT1762-5
COUT = 10μF
CBYP = 0.01μF
IL = 100mA
100ms/DIV
The LT1762 series regulators have internal thermal
limiting designed to protect the device during overload
conditions. For continuous normal conditions, the maximum junction temperature rating of 125°C must not be
exceeded. It is important to give careful consideration to
all sources of thermal resistance from junction to ambient. Additional heat sources mounted nearby must also
be considered.
BOARD AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
2500mm2
2500mm2
2500mm2
110°C/W
1000mm2
2500mm2
2500mm2
115°C/W
225mm2
2500mm2
2500mm2
120°C/W
100mm2
2500mm2
2500mm2
130°C/W
50mm2
2500mm2
2500mm2
140°C/W
*Device is mounted on topside.
Calculating Junction Temperature
Example: Given an output voltage of 3.3V, an input voltage range of 4V to 6V, an output current range of 0mA
to 50mA and a maximum ambient temperature of 50°C,
what will the maximum junction temperature be?
The power dissipated by the device will be equal to:
IOUT(MAX)(VIN(MAX) – VOUT) + IGND(VIN(MAX))
where,
IOUT(MAX) = 150mA
VIN(MAX) = 6V
IGND at (IOUT = 150mA, VIN = 6V) = 5mA
So,
P = 150mA(6V – 3.3V) + 5mA(6V) = 0.44W
Rev B
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LT1762 Series
APPLICATIONS INFORMATION
0.44W(125°C/W) = 55°C
The maximum junction temperature will then be equal to
the maximum junction temperature rise above ambient
plus the maximum ambient temperature or:
TJMAX = 50°C + 55°C = 105°C
Protection Features
The LT1762 regulators incorporate several protection features which make them ideal for use in battery-powered
circuits. In addition to the normal protection features
associated with monolithic regulators, such as current
limiting and thermal limiting, the devices are protected
against reverse input voltages, reverse output voltages
and reverse voltages from output to input.
Current limit protection and thermal overload protection
are intended to protect the device against current overload
conditions at the output of the device. For normal operation, the junction temperature should not exceed 125°C.
The input of the device will withstand reverse voltages of
20V. Current flow into the device will be limited to less
than 1mA (typically less than 100µA) and no negative
voltage will appear at the output. The device will protect
both itself and the load. This provides protection against
batteries which can be plugged in backward.
The output of the LT1762-X can be pulled below ground
without damaging the device. If the input is left open circuit or grounded, the output can be pulled below ground
by 20V. For fixed voltage versions, the output will act like
a large resistor, typically 500k or higher, limiting current
flow to less than 100µA. For adjustable versions, the output will act like an open circuit; no current will flow out of
the pin. If the input is powered by a voltage source, the
output will source the short-circuit current of the device
and will protect itself by thermal limiting. In this case,
grounding the SHDN pin will turn off the device and stop
the output from sourcing the short-circuit current.
The ADJ pin of the adjustable device can be pulled above
or below ground by as much as 7V without damaging the
device. If the input is left open circuit or grounded, the
ADJ pin will act like an open circuit when pulled below
ground and like a large resistor (typically 100k) in series
with a diode when pulled above ground.
In situations where the ADJ pin is connected to a resistor
divider that would pull the ADJ pin above its 7V clamp
voltage if the output is pulled high, the ADJ pin input
current must be limited to less than 5mA. For example, a
resistor divider is used to provide a regulated 1.5V output
from the 1.22V reference when the output is forced to 20V.
The top resistor of the resistor divider must be chosen to
limit the current into the ADJ pin to less than 5mA when
the ADJ pin is at 7V. The 13V difference between output
and ADJ pin divided by the 5mA maximum current into
the ADJ pin yields a minimum top resistor value of 2.6k.
In circuits where a backup battery is required, several
different input/output conditions can occur. The output
voltage may be held up while the input is either pulled
to ground, pulled to some intermediate voltage or is left
open circuit. Current flow back into the output will follow
the curve shown in Figure 7.
When the IN pin of the LT1762-X is forced below the OUT
pin or the OUT pin is pulled above the IN pin, input current will typically drop to less than 2µA. This can happen
if the input of the device is connected to a discharged
(low voltage) battery and the output is held up by either
a backup battery or a second regulator circuit. The state
of the SHDN pin will have no effect on the reverse output
current when the output is pulled above the input.
100
REVERSE OUTPUT CURRENT (μA)
The thermal resistance will be in the range of 110°C/W
to 140°C/W depending on the copper area. So the junction temperature rise above ambient will be approximately
equal to:
TJ = 25°C
VIN = 0V
CURRENT FLOWS
INTO OUTPUT PIN
VOUT = VSENSE
(LT1762-2.5/LT1762-3
LT1762-3.3/LT1762-5)
VOUT = VADJ
(LT1762)
90
80
70
60
50
40
30
LT1762-2.5
LT1762-3
20
LT1762-5
10
0
LT1762
LT1762-3.3
0
1
2
3 4 5 6 7 8
OUTPUT VOLTAGE (V)
9
10
1762 F07
Figure 7. Reverse Output Current
Rev B
For more information www.analog.com
15
LT1762 Series
PACKAGE DESCRIPTION
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev G)
0.889 ±0.127
(.035 ±.005)
5.10
(.201)
MIN
3.20 – 3.45
(.126 – .136)
3.00 ±0.102
(.118 ±.004)
(NOTE 3)
0.65
(.0256)
BSC
0.42 ± 0.038
(.0165 ±.0015)
TYP
8
7 6 5
0.52
(.0205)
REF
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
4.90 ±0.152
(.193 ±.006)
DETAIL “A”
0° – 6° TYP
GAUGE PLANE
0.53 ±0.152
(.021 ±.006)
DETAIL “A”
1
2 3
4
1.10
(.043)
MAX
0.86
(.034)
REF
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
TYP
0.65
(.0256)
BSC
0.1016 ±0.0508
(.004 ±.002)
MSOP (MS8) 0213 REV G
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
16
Rev B
For more information www.analog.com
LT1762 Series
REVISION HISTORY
(Revision history begins at Rev B)
REV
DATE
DESCRIPTION
B
07/18
Electrical Characteristics table, Load Regulation for the LT1762,
second line, Max value changed from 12mV to 15mV.
PAGE NUMBER
3
Rev B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No license For
is granted
implication or
otherwise under any patent or patent rights of Analog Devices.
more by
information
www.analog.com
17
LT1762 Series
TYPICAL APPLICATION
Paralleling of Regulators for Higher Output Current
R1
0.1Ω
VIN > 3.7V
+
IN
OUT
+
FB
C1
10μF
C4
0.01μF
LT1762-3.3
3.3V
300mA
C2
10μF
SHDN
BYP
GND
R2
0.1Ω
IN
OUT
C5
0.01μF
LT1762
BYP
SHDN
SHDN
ADJ
GND
R3
2.2k
R4
2.2k
3
2
R7
1.21k
8
+
1/2 LT1490
–
R6
2k
R5
10k
1
4
1762 TA02
C3
0.01μF
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
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125mA Low Dropout Regulator with 20µA IQ
Includes 2.5V Reference and Comparator
LT1121
150mA Micropower Low Dropout Regulator
30µA IQ, SOT-223 Package
LT1129
700mA Micropower Low Dropout Regulator
50µA Quiescent Current
LT1175
500mA Negative Low Dropout Micropower Regulator
45µA IQ, 0.26V Dropout Voltage, SOT-223 Package
LT1521
300mA Low Dropout Micropower Regulator with Shutdown
15µA IQ, Reverse Battery Protection
LT1529
3A Low Dropout Regulator with 50µA IQ
500mV Dropout Voltage
LT1611
Inverting 1.4MHz Switching Regulator
5V to –5V at 150mA, Low Output Noise, SOT-23 Package
LT1613
1.4MHz Single-Cell Micropower DC/DC Converter
SOT-23 Package, Internally Compensated
LTC1627
High Efficiency Synchronous Step-Down Switching Regulator
Burst Mode® Operation, Monolithic, 100% Duty Cycle
LT1761 Series
100mA, Low Noise, Low Dropout Micropower Regulators in SOT-23
20µA Quiescent Current, 20µVRMS Noise
LT1763 Series
500mA, Low Noise, LDO Micropower Regulators
30µA Quiescent Current, 20µVRMS Noise
18
Rev B
D17161-0-7/18(B)
www.analog.com
For more information www.analog.com
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