LT1762 Series
150mA, Low Noise, LDO
Micropower Regulators
U
Dropout Voltage
400
350
20
40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
1762 TA02
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
Low Noise: 20µV
RMS
(10Hz to 100kHz)
Low Quiescent Current: 25µA
Wide Input Voltage Range: 1.8V to 20V
Output Current: 150mA
Very Low Shutdown Current: < 1
µ
A
Low Dropout Voltage: 300mV
No Protection Diodes Needed
Fixed Output Voltages: 2.5V, 3V, 3.3V, 5V
Adjustable Output from 1.22V to 20V
Stable with 2.2µF Output Capacitor
Stable with Aluminum, Tantalum or
Ceramic Capacitors
Reverse Battery Protection
No Reverse Current
Overcurrent and Overtemperature Protected
8-Lead MSOP Package
APPLICATIO S
s
s
s
s
Cellular Phones
Battery-Powered Systems
Frequency Synthesizers
Noise-Sensitive Instrumentation Systems
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 300mV.
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.
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 20µV
RMS
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 pro-
tection, current limiting, thermal limiting and reverse
current protection. The parts come in fixed output volt-
ages 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
3.3V Low Noise Regulator
DROPOUT VOLTAGE (mV)
300
250
200
150
100
50
0
0
V
IN
3.7V TO
20V
IN
1µF
OUT
SENSE
LT1762-3.3
0.01µF
SHDN
BYP
GND
U
U
+
3.3V AT 150mA
20µV
RMS
NOISE
10µF
1762 TA01
1
LT1762 Series
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
OUT
SENSE/ADJ*
BYP
GND
1
2
3
4
8
7
6
5
IN
NC
NC
SHDN
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-Circut 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
ORDER PART
NUMBER
LT1762EMS8
LT1762EMS8-2.5
LT1762EMS8-3
LT1762EMS8-3.3
LT1762EMS8-5
MS8 PART MARKING
LTHF
LTHG
LTHH
LTHJ
LTHK
MS8 PACKAGE
8-LEAD PLASTIC MSOP
*PIN 2: SENSE FOR LT1762-2.5/
LT1762-3/LT1762-3.3/LT1762-5
ADJ FOR LT1762
T
JMAX
= 150°C,
θ
JA
= 125°C/ W
SEE THE APPLICATIONS
INFORMATION SECTION.
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C. (Note 2)
PARAMETER
Minimum Operating Voltage
Regulated Output Voltage
(Note 4)
CONDITIONS
I
LOAD
= 150mA
LT1762-2.5 V
IN
= 3V, I
LOAD
= 1mA
3.5V < V
IN
< 20V, 1mA < I
LOAD
< 150mA
LT1762-3
V
IN
= 3.5V, I
LOAD
= 1mA
4V < V
IN
< 20V, 1mA < I
LOAD
< 150mA
q
q
q
q
q
q
q
q
q
q
q
q
MIN
2.475
2.435
2.970
2.925
3.267
3.220
4.950
4.875
1.208
1.190
TYP
1.8
2.5
2.5
3
3
3.3
3.3
5
5
1.22
1.22
1
1
1
1
1
4
4
MAX
2.3
2.525
2.565
3.030
3.075
3.333
3.380
5.050
5.125
1.232
1.250
5
5
5
5
5
12
25
15
30
17
33
25
50
6
12
UNITS
V
V
V
V
V
V
V
V
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
LT1762-3.3 V
IN
= 3.8V, I
LOAD
= 1mA
4.3V < V
IN
< 20V, 1mA < I
LOAD
< 150mA
LT1762-5
ADJ Pin Voltage
(Notes 3, 4)
Line Regulation
LT1762
V
IN
= 5.5V, I
LOAD
= 1mA
6V < V
IN
< 20V, 1mA < I
LOAD
< 150mA
V
IN
= 2V, I
LOAD
= 1mA
2.3V < V
IN
< 20V, 1mA < I
LOAD
< 150mA
∆V
IN
= 3V to 20V, I
LOAD
= 1mA
∆V
IN
= 3.5V to 20V, I
LOAD
= 1mA
∆V
IN
= 3.8V to 20V, I
LOAD
= 1mA
∆V
IN
= 5.5V to 20V, I
LOAD
= 1mA
∆V
IN
= 2V to 20V, I
LOAD
= 1mA
V
IN
= 3.5V,
∆I
LOAD
= 1mA to 150mA
V
IN
= 3.5V,
∆I
LOAD
= 1mA to 150mA
V
IN
= 4V,
∆I
LOAD
= 1mA to 150mA
V
IN
= 4V,
∆I
LOAD
= 1mA to 150mA
V
IN
= 4.3V,
∆I
LOAD
= 1mA to 150mA
V
IN
= 4.3V,
∆I
LOAD
= 1mA to 150mA
V
IN
= 6V,
∆I
LOAD
= 1mA to 150mA
V
IN
= 6V,
∆I
LOAD
= 1mA to 150mA
V
IN
= 2.3V,
∆I
LOAD
= 1mA to 150mA
V
IN
= 2.3V,
∆I
LOAD
= 1mA to 150mA
LT1762-2.5
LT1762-3
LT1762-3.3
LT1762-5
LT1762 (Note 3)
LT1762-2.5
LT1762-3
LT1762-3.3
LT1762-5
LT1762 (Note 3)
Load Regulation
q
5
q
9
q
1
q
2
U
W
U
U
W W
W
LT1762 Series
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C. (Note 2)
PARAMETER
Dropout Voltage
V
IN
= V
OUT(NOMINAL)
(Notes 5, 6)
CONDITIONS
I
LOAD
= 1mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 50mA
I
LOAD
= 150mA
I
LOAD
= 150mA
GND Pin Current
V
IN
= V
OUT(NOMINAL)
(Notes 5, 7)
I
LOAD
= 0mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 150mA
C
OUT
= 10µF, C
BYP
= 0.01µF, I
LOAD
= 150mA, BW = 10Hz to 100kHz
(Notes 3, 8)
V
OUT
= Off to On
V
OUT
= On to Off
V
SHDN
= 0V
V
SHDN
= 20V
V
IN
= 6V, V
SHDN
= 0V
V
IN
– V
OUT
= 1.5V (Avg), V
RIPPLE
= 0.5V
P-P
, f
RIPPLE
= 120Hz,
I
LOAD
= 150mA
V
IN
= 7V, V
OUT
= 0V
V
IN
= V
OUT(NOMINAL)
+ 1V,
∆V
OUT
= – 0.1V
V
IN
= – 20V, V
OUT
= 0V
LT1762-2.5
LT1762-3
LT1762-3.3
LT1762-5
LT1762 (Note 3)
V
OUT
= 2.5V, V
IN
< 2.5V
V
OUT
= 3V, V
IN
< 3V
V
OUT
= 3.3V, V
IN
< 3.3V
V
OUT
= 5V, V
IN
< 5V
V
OUT
= 1.22V, V
IN
< 1.22V
q
q
q
q
q
MIN
TYP
0.09
0.15
MAX
0.15
0.19
0.21
0.25
0.27
0.31
0.33
0.40
65
120
500
1.8
7
100
2
UNITS
V
V
V
V
V
V
V
V
µA
µA
µA
mA
mA
µV
RMS
nA
V
V
µA
µA
q
0.21
q
0.27
q
q
q
q
q
q
25
70
350
1.3
4
20
30
0.25
0.8
0.65
0.1
1
0.1
50
65
300
160
Output Voltage Noise
ADJ Pin Bias Current
Shutdown Threshold
SHDN Pin Current
(Note 9)
Quiescent Current in Shutdown
Ripple Rejection
Current Limit
Input Reverse Leakage Current
Reverse Output Current
(Note 10)
1
µA
dB
mA
mA
1
10
10
10
10
5
20
20
20
20
10
mA
µA
µA
µA
µA
µA
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LT1762 regulators are tested and specified under pulse load
conditions such that T
J
≈
T
A
. 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.
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: V
IN
– V
DROPOUT
.
Note 7:
GND pin current is tested with V
IN
= V
OUT(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.
3
LT1762 Series
TYPICAL PERFORMANCE CHARACTERISTICS
Typical Dropout Voltage
500
450
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
400
350
300
250
200
150
100
50
0
0
20
40
60 80 100 120 140 160
LOAD CURRENT (mA)
1762 G01
T
J
= 125°C
T
J
= 25°C
Quiescent Current
40
35
QUIESCENT CURRENT (µA)
V
IN
= 6V
R
L
=
∞,
I
L
= 0 (LT1762-2.5/-3/-3.3/-5)
R
L
= 250k, I
L
= 5µA (LT1762)
OUTPUT VOLTAGE (V)
25
20
15
10
5
0
–50 –25
0
25
50
75
100
125
V
SHDN
= V
IN
2.51
2.50
2.49
2.48
2.47
2.46
–50 –25
0
25
50
75
100
125
OUTPUT VOLTAGE (V)
30
TEMPERATURE (°C)
1762 G04
LT1762-3.3
Output Voltage
3.360
I
L
= 1mA
3.345
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.315
3.300
3.285
3.270
3.255
3.240
–50 –25
0
25
50
75
100
125
5.025
5.000
4.975
4.950
4.925
4.900
–50 –25
0
25
50
75
100
125
ADJ PIN VOLTAGE (V)
3.330
TEMPERATURE (°C)
1762 G07
4
U W
Guaranteed Dropout Voltage
500
450
400
350
300
250
200
150
100
50
0
0
20
40
60 80 100 120 140 160
LOAD CURRENT (mA)
1762 G02
Dropout Voltage
500
450
= TEST POINTS
T
J
≤
125°C
400
350
300
250
200
150
100
50
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
I
L
= 1mA
I
L
= 50mA
I
L
= 10mA
I
L
= 150mA
T
J
≤
25°C
1762 G03
LT1762-2.5
Output Voltage
2.54
I
L
= 1mA
2.53
2.52
3.045
3.030
3.015
3.000
2.985
2.970
2.955
3.060
LT1762-3
Output Voltage
I
L
= 1mA
2.940
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
1762 G05
TEMPERATURE (°C)
1762 G06
LT1762-5
Output Voltage
5.100
I
L
= 1mA
5.075
5.050
1.235
1.230
1.225
1.220
1.215
1.210
1.205
1.240
LT1762
ADJ Pin Voltage
I
L
= 1mA
1.200
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
1762 G08
TEMPERATURE (°C)
1762 G09
LT1762 Series
TYPICAL PERFORMANCE CHARACTERISTICS
LT1762-2.5
Quiescent Current
400
350
T
J
= 25°C
R
L
=
∞
QUIESCENT CURRENT (µA)
QUIESCENT CURRENT (µA)
300
250
200
150
100
50
0
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
V
SHDN
= V
IN
V
SHDN
= 0V
QUIESCENT CURRENT (µA)
LT1762-5
Quiescent Current
400
350
T
J
= 25°C
R
L
=
∞
QUIESCENT CURRENT (µA)
30
25
20
15
10
5
QUIESCENT CURRENT (µA)
GND PIN CURRENT (µA)
300
250
200
150
V
SHDN
= V
IN
100
50
0
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
V
SHDN
= 0V
LT1762-3
GND Pin Current
800
700
T
J
= 25°C
V
IN
= V
SHDN
*FOR V
OUT
= 3V
800
700
GND PIN CURRENT (µA)
GND PIN CURRENT (µA)
GND PIN CURRENT (µA)
600
500
400
300
200
100
0
0
1
R
L
= 120Ω
I
L
= 25mA*
R
L
= 300Ω
I
L
= 10mA*
R
L
= 3k
I
L
= 1mA*
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
U W
1762 G10
1762 G13
1762 G16
LT1762-3
Quiescent Current
400
350
300
250
200
150
100
50
0
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
V
SHDN
= V
IN
V
SHDN
= 0V
T
J
= 25°C
R
L
=
∞
400
350
300
250
200
150
100
50
0
LT1762-3.3
Quiescent Current
T
J
= 25°C
R
L
=
∞
V
SHDN
= V
IN
0
1
2
V
SHDN
= 0V
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
1762 G11
1762 G12
LT1762
Quiescent Current
800
V
SHDN
= V
IN
LT1762-2.5
GND Pin Current
700
600
500
400
300
200
100
R
L
= 2.5k
I
L
= 1mA*
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
R
L
= 100Ω
I
L
= 25mA*
R
L
= 250Ω
I
L
= 10mA*
T
J
= 25°C
V
IN
= V
SHDN
*FOR V
OUT
= 2.5V
T
J
= 25°C
R
L
= 250k
V
SHDN
= 0V
0
0
2
4
6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
1762 G14
0
1762 G15
LT1762-3.3
GND Pin Current
T
J
= 25°C
V
IN
= V
SHDN
*FOR V
OUT
= 3.3V
LT1762-5
GND Pin Current
800
700
600
500
400
300
200
100
8
9
10
600
500
400
300
200
100
0
0
1
2
R
L
= 132Ω
I
L
= 25mA*
R
L
= 200Ω
I
L
= 25mA*
T
J
= 25°C
V
IN
= V
SHDN
*FOR V
OUT
= 5V
R
L
= 330Ω
I
L
= 10mA*
R
L
= 3.3k
I
L
= 1mA*
3 4 5 6 7
INPUT VOLTAGE (V)
R
L
= 5k
I
L
= 1mA*
R
L
= 500Ω
I
L
= 10mA*
0
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
1762 G17
1762 G18
5
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