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Электронный компонент: LT1761-2

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1
LT1761 Series
sn1761 1761fas
100mA, Low Noise,
LDO Micropower
Regulators in SOT-23
s
Tiny 5-Lead SOT-23 Package
s
Low Noise: 20
V
RMS
(10Hz to 100kHz)
s
Low Quiescent Current: 20
A
s
Wide Input Voltage Range: 1.8V to 20V
s
Output Current: 100mA
s
Very Low Shutdown Current: < 0.1
A
s
Low Dropout Voltage: 300mV at 100mA
s
Fixed Output Voltages: 1.5V, 1.8V, 2V, 2.5V, 2.8V,
3V, 3.3V, 5V
s
Adjustable Output from 1.22V to 20V
s
Stable with 1
F Output Capacitor
s
Stable with Aluminum, Tantalum or
Ceramic Capacitors
s
Reverse Battery Protected
s
No Reverse Current
s
No Protection Diodes Needed
s
Overcurrent and Overtemperature Protected
The LT
1761 series are micropower, low noise, low
dropout regulators. With an external 0.01
F bypass
capacitor, output noise drops to 20
V
RMS
over a 10Hz to
100kHz bandwidth. Designed for use in battery-powered
systems, the low 20
A quiescent current makes them an
ideal choice. In shutdown, quiescent current drops to less
than 0.1
A. The devices are capable of operating over an
input voltage from 1.8V to 20V, and can supply 100mA of
output current with a dropout voltage of 300mV. Quies-
cent current is well controlled, not rising in dropout as it
does with many other regulators.
The LT1761 regulators are stable with output capacitors
as low as 1
F. 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 device is available in fixed output
voltages of 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V and 5V,
and as an adjustable device with a 1.22V reference voltage.
The LT1761 regulators are available in the 5-lead SOT-23
package.
10Hz to 100kHz Output Noise
5V Low Noise Regulator
s
Cellular Phones
s
Pagers
s
Battery-Powered Systems
s
Frequency Synthesizers
s
Wireless Modems
, LTC and LT are registered trademarks of Linear Technology Corporation.
IN
SHDN
0.01
F
10
F
1761 TA01
OUT
V
IN
5.4V TO
20V
BYP
GND
LT1761-5
5V AT100mA
20
V
RMS
NOISE
1
F
+
V
OUT
100
V/DIV
20
V
RMS
1761 G48
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LT1761 Series
sn1761 1761fas
(Note 1)
IN Pin Voltage ........................................................
20V
OUT Pin Voltage ....................................................
20V
Input to Output Differential Voltage .......................
20V
ADJ Pin Voltage ......................................................
7V
BYP Pin Voltage ....................................................
0.6V
SHDN Pin Voltage .................................................
20V
LT1761ES5-BYP
ORDER PART
NUMBER
T
JMAX
= 150
C,
JA
= 250
C/ W
SEE THE APPLICATIONS INFORMATION SECTION.
5 OUT
4 ADJ
IN 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
SHDN 3
5 OUT
4 ADJ
IN 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
BYP 3
5 OUT
4 BYP
IN 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
SHDN 3
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
S5 PART
MARKING
5 OUT
4 ADJ
IN 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
BYP 3
T
JMAX
= 150
C,
JA
= 250
C/ W
SEE THE APPLICATIONS INFORMATION SECTION.
LT1761ES5-SD
ORDER PART
NUMBER
S5 PART
MARKING
LTGC
LTGH
LT1761ES5-1.5
LT1761ES5-1.8
LT1761ES5-2
LT1761ES5-2.5
LT1761ES5-2.8
LT1761ES5-3
LT1761ES5-3.3
LT1761ES5-5
ORDER PART
NUMBER
S5 PART
MARKING
LTMT
LTJM
LTJE
LTGD
LTLB
LTGE
LTGF
LTGG
T
JMAX
= 150
C,
JA
= 250
C/ W
SEE THE APPLICATIONS INFORMATION SECTION.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage (Notes 3, 11) I
LOAD
= 100mA
q
1.8
2.3
V
Regulated Output Voltage
LT1761-1.5
V
IN
= 2V, I
LOAD
= 1mA
1.478
1.5
1.522
V
(Note 4)
2.5V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
q
1.457
1.5
1.538
V
2.5V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
q
1.436
1.5
1.555
V
LT1761-1.8
V
IN
= 2.3V, I
LOAD
= 1mA
1.775
1.8
1.825
V
2.8V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
q
1.750
1.8
1.845
V
2.8V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
q
1.725
1.8
1.860
V
LT1761-2
V
IN
= 2.5V, I
LOAD
= 1mA
1.970
2
2.030
V
3V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
q
1.945
2
2.045
V
3V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
q
1.920
2
2.060
V
LT1761-2.5
V
IN
= 3V, I
LOAD
= 1mA
2.465
2.5
2.535
V
3.5V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
q
2.435
2.5
2.565
V
3.5V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
q
2.415
2.5
2.575
V
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25
C. (Note 2)
Consult factory for parts specified with wider operating temperature ranges.
ABSOLUTE AXI U RATI GS
W
W
W
U
PACKAGE/ORDER I FOR ATIO
U
U
W
ELECTRICAL CHARACTERISTICS
3
LT1761 Series
sn1761 1761fas
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25
C. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Regulated Output Voltage
LT1761-2.8
V
IN
= 3.3V, I
LOAD
= 1mA
2.762
2.8
2.838
V
(Note 4)
3.8V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
q
2.732
2.8
2.868
V
3.8V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
q
2.706
2.8
2.884
V
LT1761-3
V
IN
= 3.5V, I
LOAD
= 1mA
2.960
3
3.040
V
4V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
q
2.930
3
3.070
V
4V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
q
2.900
3
3.090
V
LT1761-3.3
V
IN
= 3.8V, I
LOAD
= 1mA
3.250
3.3
3.350
V
4.3V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
q
3.230
3.3
3.370
V
4.3V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
q
3.190
3.3
3.400
V
LT1761-5
V
IN
= 5.5V, I
LOAD
= 1mA
4.935
5
5.065
V
6V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
q
4.900
5
5.100
V
6V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
q
4.850
5
5.120
V
ADJ Pin Voltage
LT1761
V
IN
= 2V, I
LOAD
= 1mA
1.205
1.220
1.235
V
(Note 3, 4)
2.3V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
q
1.190
1.220
1.250
V
2.3V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
q
1.170
1.220
1.260
V
Line Regulation
LT1761-1.5
V
IN
= 2V to 20V, I
LOAD
= 1mA
q
1
10
mV
LT1761-1.8
V
IN
= 2.3V to 20V, I
LOAD
= 1mA
q
1
10
mV
LT1761-2
V
IN
= 2.5V to 20V, I
LOAD
= 1mA
q
1
10
mV
LT1761-2.5
V
IN
= 3V to 20V, I
LOAD
= 1mA
q
1
10
mV
LT1761-2.8
V
IN
= 3.3V to 20V, I
LOAD
= 1mA
q
1
10
mV
LT1761-3
V
IN
= 3.5V to 20V, I
LOAD
= 1mA
q
1
10
mV
LT1761-3.3
V
IN
= 3.8V to 20V, I
LOAD
= 1mA
q
1
10
mV
LT1761-5
V
IN
= 5.5V to 20V, I
LOAD
= 1mA
q
1
10
mV
LT1761(Note 3)
V
IN
= 2V to 20V, I
LOAD
= 1mA
q
1
10
mV
Load Regulation
LT1761-1.5
V
IN
= 2.5V,
I
LOAD
= 1mA to 50mA
10
20
mV
V
IN
= 2.5V,
I
LOAD
= 1mA to 50mA
q
35
mV
V
IN
= 2.5V,
I
LOAD
= 1mA to 100mA
14
30
mV
V
IN
= 2.5V,
I
LOAD
= 1mA to 100mA
q
55
mV
LT1761-1.8
V
IN
= 2.8V,
I
LOAD
= 1mA to 50mA
10
20
mV
V
IN
= 2.8V,
I
LOAD
= 1mA to 50mA
q
35
mV
V
IN
= 2.8V,
I
LOAD
= 1mA to 100mA
15
30
mV
V
IN
= 2.8V,
I
LOAD
= 1mA to 100mA
q
60
mV
LT1761-2
V
IN
= 3V,
I
LOAD
= 1mA to 50mA
10
20
mV
V
IN
= 3V,
I
LOAD
= 1mA to 50mA
q
35
mV
V
IN
= 3V,
I
LOAD
= 1mA to 100mA
15
35
mV
V
IN
= 3V,
I
LOAD
= 1mA to 100mA
q
65
mV
LT1761-2.5
V
IN
= 3.5V,
I
LOAD
= 1mA to 50mA
10
20
mV
V
IN
= 3.5V,
I
LOAD
= 1mA to 50mA
q
35
mV
V
IN
= 3.5V,
I
LOAD
= 1mA to 100mA
20
40
mV
V
IN
= 3.5V,
I
LOAD
= 1mA to 100mA
q
80
mV
LT1761-2.8
V
IN
= 3.8V,
I
LOAD
= 1mA to 50mA
10
20
mV
V
IN
= 3.8V,
I
LOAD
= 1mA to 50mA
q
38
mV
V
IN
= 3.8V,
I
LOAD
= 1mA to 100mA
20
40
mV
V
IN
= 3.8V,
I
LOAD
= 1mA to 100mA
q
86
mV
LT1761-3
V
IN
= 4V,
I
LOAD
= 1mA to 50mA
10
20
mV
V
IN
= 4V,
I
LOAD
= 1mA to 50mA
q
40
mV
V
IN
= 4V,
I
LOAD
= 1mA to 100mA
20
40
mV
V
IN
= 4V,
I
LOAD
= 1mA to 100mA
q
90
mV
ELECTRICAL CHARACTERISTICS
4
LT1761 Series
sn1761 1761fas
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Load Regulation
LT1761-3.3
V
IN
= 4.3V,
I
LOAD
= 1mA to 50mA
10
20
mV
V
IN
= 4.3V,
I
LOAD
= 1mA to 50mA
q
40
mV
V
IN
= 4.3V,
I
LOAD
= 1mA to 100mA
20
40
mV
V
IN
= 4.3V,
I
LOAD
= 1mA to 100mA
q
100
mV
LT1761-5
V
IN
= 6V,
I
LOAD
= 1mA to 50mA
15
30
mV
V
IN
= 6V,
I
LOAD
= 1mA to 50mA
q
60
mV
V
IN
= 6V,
I
LOAD
= 1mA to 100mA
25
65
mV
V
IN
= 6V,
I
LOAD
= 1mA to 100mA
q
150
mV
LT1761 (Note 3) V
IN
= 2.3V,
I
LOAD
= 1mA to 50mA
1
6
mV
V
IN
= 2.3V,
I
LOAD
= 1mA to 50mA
q
12
mV
V
IN
= 2.3V,
I
LOAD
= 1mA to 100mA
1
12
mV
V
IN
= 2.3V,
I
LOAD
= 1mA to 100mA
q
50
mV
Dropout Voltage
I
LOAD
= 1mA
0.10
0.15
V
V
IN
= V
OUT(NOMINAL)
I
LOAD
= 1mA
q
0.19
V
(Notes 5, 6, 11)
I
LOAD
= 10mA
0.17
0.22
V
I
LOAD
= 10mA
q
0.29
V
I
LOAD
= 50mA
0.24
0.28
V
I
LOAD
= 50mA
q
0.38
V
I
LOAD
= 100mA
0.30
0.35
V
I
LOAD
= 100mA
q
0.45
V
GND Pin Current
I
LOAD
= 0mA
q
20
45
A
V
IN
= V
OUT(NOMINAL)
I
LOAD
= 1mA
q
55
100
A
(Notes 5, 7)
I
LOAD
= 10mA
q
230
400
A
I
LOAD
= 50mA
q
1
2
mA
I
LOAD
= 100mA
q
2.2
4
mA
Output Voltage Noise
C
OUT
= 10
F, C
BYP
= 0.01
F, I
LOAD
= 100mA, BW = 10Hz to 100kHz
20
V
RMS
ADJ Pin Bias Current
(Notes 3, 8)
30
100
nA
Shutdown Threshold
V
OUT
= Off to On
q
0.8
2
V
V
OUT
= On to Off
q
0.25
0.65
V
SHDN Pin Current
V
SHDN
= 0V
q
0
0.5
A
(Note 9)
V
SHDN
= 20V
q
1
3
A
Quiescent Current in Shutdown
V
IN
= 6V, V
SHDN
= 0V
0.01
0.1
A
Ripple Rejection (Note 3)
V
IN
V
OUT
= 1.5V (Avg), V
RIPPLE
= 0.5V
P-P
, f
RIPPLE
= 120Hz,
55
65
dB
I
LOAD
= 50mA
Current Limit
V
IN
= 7V, V
OUT
= 0V
200
mA
V
IN
= V
OUT(NOMINAL)
+ 1V,
V
OUT
= 5%
q
110
mA
Input Reverse Leakage Current
V
IN
= 20V, V
OUT
= 0V
q
1
mA
Reverse Output Current
LT1761-1.5
V
OUT
= 1.5V, V
IN
< 1.5V
10
20
A
(Note 10)
LT1761-1.8
V
OUT
= 1.8V, V
IN
< 1.8V
10
20
A
LT1761-2
V
OUT
= 2V, V
IN
< 2V
10
20
A
LT1761-2.5
V
OUT
= 2.5V, V
IN
< 2.5V
10
20
A
LT1761-2.8
V
OUT
= 2.8V, V
IN
< 2.8V
10
20
A
LT1761-3
V
OUT
= 3V, V
IN
< 3V
10
20
A
LT1761-3.3
V
OUT
= 3.3V, V
IN
< 3.3V
10
20
A
LT1761-5
V
OUT
= 5V, V
IN
< 5V
10
20
A
LT1761 (Note 3) V
OUT
= 1.22V, V
IN
< 1.22V
5
10
A
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25
C. (Note 2)
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 LT1761 (adjustable versions) are tested and specified for
these conditions with the ADJ pin connected to the OUT pin.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1761 regulators are tested and specified under pulse load
conditions such that T
J
T
A
. The LT1761 is 100% production tested at
ELECTRICAL CHARACTERISTICS
5
LT1761 Series
sn1761 1761fas
OUTPUT CURRENT (mA)
500
450
400
350
300
250
200
150
100
50
0
DROPOUT VOLTAGE (mV)
1761 G01
0
10 20 30 40
50 60 70
80 90 100
T
J
125
C
T
J
25
C
= TEST POINTS
TEMPERATURE (
C)
50
QUIESCENT CURRENT (
A)
100
1761 G03
0
50
40
35
30
25
20
15
10
5
0
25
25
75
125
V
IN
= 6V
R
L
=
(250k FOR LT1761-BYP, -SD)
I
L
= 0 (5
A FOR LT1761-BYP, -SD)
V
SHDN
= V
IN
V
SHDN
= 0V
TEMPERATURE (
C)
50
OUTPUT VOLTAGE (V)
100
1761 G06
0
50
1.84
1.83
1.82
1.81
1.80
1.79
1.78
1.77
1.76
25
25
75
125
I
L
= 1mA
Guaranteed Dropout Voltage
Quiescent Current
LT1761-1.8
Output Voltage
Dropout Voltage
TEMPERATURE (
C)
50
DROPOUT VOLTAGE (mV)
0
50
75
1761 G01.1
25
25
100
125
I
L
= 100mA
I
L
= 50mA
I
L
= 10mA
I
L
= 1mA
500
450
400
350
300
250
200
150
100
50
0
OUTPUT CURRENT (mA)
500
450
400
350
300
250
200
150
100
50
0
DROPOUT VOLTAGE (mV)
1761 G00
0
10 20 30 40
50 60 70
80 90 100
T
J
= 125
C
T
J
= 25
C
Typical Dropout Voltage
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 LT1761
(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 5
A 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
.
ELECTRICAL CHARACTERISTICS
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 or at the minimum input
voltage specification. 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 LT1761, LT1761-1.5, LT1761-1.8 and LT1761-2 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 PERFOR A CE CHARACTERISTICS
U
W
TEMPERATURE (
C)
50
OUTPUT VOLTAGE (V)
100
1761 G51
0
50
1.528
1.521
1.514
1.507
1.500
1.493
1.486
1.479
1.472
25
25
75
125
I
L
= 1mA
LT1761-1.5
Output Voltage