LT1763 Series
500mA, Low Noise, LDO
Micropower Regulators
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
Low Noise: 20µV
RMS
(10Hz to 100kHz)
Output Current: 500mA
Low Quiescent Current: 30µA
Wide Input Voltage Range: 1.8V to 20V
Low Dropout Voltage: 300mV
Very Low Shutdown Current: < 1
µ
A
No Protection Diodes Needed
Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V
Adjustable Output from 1.22V to 20V
Stable with 3.3µF Output Capacitor
Stable with Aluminum, Tantalum or
Ceramic Capacitors
Reverse Battery Protection
No Reverse Current
Overcurrent and Overtemperature Protected
8-Lead SO Package
APPLICATIO S
s
s
s
Cellular Phones
Battery-Powered Systems
Noise-Sensitive Instrumentation Systems
The LT
®
1763 series are micropower, low noise, low
dropout regulators. The devices are capable of supplying
500mA of output current with a dropout voltage of 300mV.
Designed for use in battery-powered systems, the low
30µA 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 LT1763 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 LT1763 regulators are stable with output
capacitors as low as 3.3µF. 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 1.5V, 1.8V, 2.5V, 3V, 3.3V and 5V, and as an
adjustable device with a 1.22V reference voltage. The
LT1763 regulators are available in the 8-lead SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
3.3V Low Noise Regulator
IN
1µF
OUT
SENSE
LT1763-3.3
SHDN
BYP
GND
0.01µF
1763 TA01
400
350
V
IN
3.7V TO
20V
+
3.3V AT 500mA
20µV
RMS
NOISE
10µF
DROPOUT VOLTAGE (mV)
300
250
200
150
100
50
0
0
100
300
400
200
OUTPUT CURRENT (mA)
500
1763 TA02
U
Dropout Voltage
1763fa
U
U
1
LT1763 Series
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
OUT 1
SENSE/ADJ* 2
GND 3
BYP 4
8
7
6
5
IN
GND
GND
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
*PIN 2: SENSE FOR LT1763-1.5/
LT1763-1.8/LT1763-2.5/
LT1763-3/LT1763-3.3/LT1763-5
ADJ FOR LT1763
T
JMAX
= 150°C,
θ
JA
= 70°C/ W,
θ
JC
= 35°C/ W
SEE THE APPLICATIONS
INFORMATION SECTION.
S8 PACKAGE
8-LEAD PLASTIC SO
ORDER PART NUMBER
LT1763CS8
LT1763CS8-3
LT1763CS8-1.5 LT1763CS8-3.3
LT1763CS8-1.8 LT1763CS8-5
LT1763CS8-2.5
S8 PART MARKING
1763
17633
176315 176333
176318 17635
176325
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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
= 500mA (Notes 3, 11)
LT1763-1.5 V
IN
= 2V, I
LOAD
= 1mA
2.5V < V
IN
< 20V, 1mA < I
LOAD
< 500mA
LT1763-1.8 V
IN
= 2.3V, I
LOAD
= 1mA
2.8V < V
IN
< 20V, 1mA < I
LOAD
< 500mA
LT1763-2.5 V
IN
= 3V, I
LOAD
= 1mA
3.5V < V
IN
< 20V, 1mA < I
LOAD
< 500mA
LT1763-3
V
IN
= 3.5V, I
LOAD
= 1mA
4V < V
IN
< 20V, 1mA < I
LOAD
< 500mA
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
MIN
1.485
1.462
1.782
1.755
2.475
2.435
2.970
2.925
3.267
3.220
4.950
4.875
1.208
1.190
TYP
1.8
1.5
1.5
1.8
1.8
2.5
2.5
3
3
3.3
3.3
5
5
1.22
1.22
1
1
1
1
1
1
1
3
4
MAX
2.3
1.515
1.538
1.818
1.845
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
5
5
8
15
9
18
12
25
UNITS
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
1763fa
LT1763-3.3 V
IN
= 3.8V, I
LOAD
= 1mA
4.3V < V
IN
< 20V, 1mA < I
LOAD
< 500mA
LT1763-5
ADJ Pin Voltage
(Notes 3, 4)
Line Regulation
LT1763
V
IN
= 5.5V, I
LOAD
= 1mA
6V < V
IN
< 20V, 1mA < I
LOAD
< 500mA
V
IN
= 2V, I
LOAD
= 1mA
2.22V < V
IN
< 20V, 1mA < I
LOAD
< 500mA
∆V
IN
= 2V to 20V, I
LOAD
= 1mA
∆V
IN
= 2.3V to 20V, I
LOAD
= 1mA
∆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
= 2.5V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 2.5V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 2.8V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 2.8V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 3.5V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 3.5V,
∆I
LOAD
= 1mA to 500mA
LT1763-1.5
LT1763-1.8
LT1763-2.5
LT1763-3
LT1763-3.3
LT1763-5
LT1763 (Note 3)
LT1763-1.5
LT1763-1.8
LT1763-2.5
Load Regulation
q
5
q
2
U
W
U
U
W W
W
LT1763 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
Load Regulation
CONDITIONS
LT1763-3
LT1763-3.3
LT1763-5
LT1763 (Note 3)
Dropout Voltage
V
IN
= V
OUT(NOMINAL)
(Notes 5, 6, 11)
I
LOAD
= 10mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 100mA
I
LOAD
= 500mA
I
LOAD
= 500mA
GND Pin Current
V
IN
= V
OUT(NOMINAL)
(Notes 5, 7)
I
LOAD
= 0mA
I
LOAD
= 1mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 250mA
I
LOAD
= 500mA
C
OUT
= 10µF, C
BYP
= 0.01µF, I
LOAD
= 500mA, 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
= 500mA
V
IN
= 7V, V
OUT
= 0V
V
IN
= V
OUT(NOMINAL)
+ 1V,
∆V
OUT
= – 0.1V
V
IN
= – 20V, V
OUT
= 0V
LT1763-1.5
LT1763-1.8
LT1763-2.5
LT1763-3
LT1763-3.3
LT1763-5
LT1763 (Note 3)
V
OUT
= 1.5V, V
IN
< 1.5V
V
OUT
= 1.8V, V
IN
< 1.8V
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
MIN
V
IN
= 4V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 4V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 4.3V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 4.3V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 6V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 6V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 2.3V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 2.3V,
∆I
LOAD
= 1mA to 500mA
q
TYP
7
7
MAX
15
30
17
33
25
50
6
12
0.19
0.25
0.22
0.32
0.24
0.34
0.35
0.45
75
120
1.6
3
8
16
100
2
UNITS
mV
mV
mV
mV
mV
mV
mV
mV
V
V
V
V
V
V
V
V
µA
µA
mA
mA
mA
mA
µV
RMS
nA
V
V
µA
µA
q
12
q
2
q
0.13
q
0.17
q
0.20
q
0.30
q
q
q
q
q
q
q
30
65
1.1
2
5
11
20
30
0.25
0.8
0.65
0.1
1
0.1
50
65
700
520
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
10
10
5
20
20
20
20
20
20
10
mA
µA
µA
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 LT1763 regulators are tested and specified under pulse load
conditions such that T
J
≈
T
A
. The LT1763 is 100% tested at T
A
= 25°C.
Performance at – 40°C and 125°C is assured by design, characterization
and correlation with statistical process controls.
Note 3:
The LT1763 (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 LT1763
(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.
1763fa
3
LT1763 Series
ELECTRICAL CHARACTERISTICS
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)
or V
IN
= 2.3V
(whichever is greater) 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.
Note 11:
For the LT1763, LT1763-1.5 and LT1763-1.8 dropout voltage will
be limited by the minimum input voltage specification under some output
voltage/load conditions. See the curve of Minimum Input Voltage in the
Typical Performance Characteristics.
TYPICAL PERFORMANCE CHARACTERISTICS
Typical Dropout Voltage
500
GUARANTEED DROPOUT VOLTAGE (mV)
450
DROPOUT VOLTAGE (mV)
T
J
= 125°C
350
300
250
200
150
100
50
0
0
50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
1763 G01
350
300
250
200
150
100
50
0
0
T
J
≤
125°C
T
J
≤
25°C
DROPOUT VOLTAGE (mV)
400
T
J
= 25°C
Quiescent Current
50
45
1.528
1.521
QUIESCENT CURRENT (µA)
40
35
30
25
20
15
10
V
IN
= 6V
R
L
=
∞,
I
L
= 0 (LT1763-1.5/-1.8/-2.5/-3/-3.3/-5)
5
R
L
= 250k, I
L
= 5µA (LT1763)
0
0
25
50
75 100 125
–50 –25
TEMPERATURE (°C)
1763 G04
V
SHDN
= V
IN
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
4
U W
Guaranteed Dropout Voltage
500
450
400
Dropout Voltage
500
450
400
350
300
250
200
150
100
50
I
L
= 50mA
I
L
= 10mA
100
125
I
L
= 1mA
I
L
= 100mA
I
L
= 250mA
I
L
= 500mA
= TEST POINTS
50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
1763 G02
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
1763 G03
LT1763-1.5
Output Voltage
1.84
I
L
= 1mA
1.83
1.82
1.81
1.80
1.79
1.78
1.77
0
25
50
75
100
125
1.514
1.507
1.500
1.493
1.486
1.479
1.472
–50 –25
LT1763-1.8
Output Voltage
I
L
= 1mA
1.76
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
1763 G50
TEMPERATURE (°C)
1763 G51
1763fa
LT1763 Series
TYPICAL PERFORMANCE CHARACTERISTICS
LT1763-2.5
Output Voltage
2.54
I
L
= 1mA
2.53
3.045
2.52
2.51
2.50
2.49
2.48
2.47
2.46
–50 –25
0
25
50
75
100
125
3.030
3.015
3.000
2.985
2.970
2.955
2.940
–50 –25
0
25
50
75
100
125
3.060
I
L
= 1mA
3.345
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
1763 G05
LT1763-5
Output Voltage
5.100
I
L
= 1mA
5.075
OUTPUT VOLTAGE (V)
ADJ PIN VOLTAGE (V)
5.050
5.025
5.000
4.975
4.950
4.925
4.900
–50 –25
0
25
50
75
100
125
1.230
1.225
1.220
1.215
1.210
1.205
1.200
–50 –25
0
25
50
75
100
125
QUIESCENT CURRENT (µA)
TEMPERATURE (°C)
1763 G08
LT1763-1.8
Quiescent Current
250
225
T
J
= 25°C
R
L
=
∞
250
225
QUIESCENT CURRENT (µA)
QUIESCENT CURRENT (µA)
175
150
125
100
75
50
25
0
0
1
2
V
SHDN
= V
IN
V
SHDN
= 0V
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
175
150
125
100
75
50
25
0
0
1
2
V
SHDN
= V
IN
V
SHDN
= 0V
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
QUIESCENT CURRENT (µA)
200
U W
LT1763-3
Output Voltage
3.360
LT1763-3.3
Output Voltage
I
L
= 1mA
3.330
3.315
3.300
3.285
3.270
3.255
3.240
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
1763 G06
TEMPERATURE (°C)
1763 G07
LT1763
ADJ Pin Voltage
1.240
1.235
I
L
= 1mA
250
225
200
175
150
125
100
75
50
25
0
LT1763-1.5
Quiescent Current
T
J
= 25°C
R
L
=
∞
V
SHDN
= V
IN
V
SHDN
= 0V
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
TEMPERATURE (°C)
1763 G09
1763 G52
LT1763-2.5
Quiescent Current
250
T
J
= 25°C
R
L
=
∞
225
200
175
150
125
100
75
50
25
0
LT1763-3
Quiescent Current
T
J
= 25°C
R
L
=
∞
200
V
SHDN
= V
IN
V
SHDN
= 0V
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
1763 G53
1763 G10
1763 G11
1763fa
5
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