LT1761 Series
100mA, Low Noise,
LDO Micropower
Regulators in SOT-23
FEATURES
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
DESCRIPTIO
Low Noise: 20μV
RMS
(10Hz to 100kHz)
Low Quiescent Current: 20μA
Wide Input Voltage Range: 1.8V to 20V
Output Current: 100mA
Very Low Shutdown Current: < 0.1
μ
A
Low Dropout Voltage: 300mV at 100mA
Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2V, 2.5V,
2.8V, 3V, 3.3V, 5V
Adjustable Output from 1.22V to 20V
Stable with 1μF Output Capacitor
Stable with Aluminum, Tantalum or
Ceramic Capacitors
Reverse Battery Protected
No Reverse Current
No Protection Diodes Needed
Overcurrent and Overtemperature Protected
Available in Tiny 5-Lead SOT-23 Package
APPLICATIO S
■
■
■
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■
Cellular Phones
Pagers
Battery-Powered Systems
Frequency Synthesizers
Wireless Modems
The LT
®
1761 series are micropower, low noise, low
dropout regulators. With an external 0.01μF bypass
capacitor, output noise drops to 20μV
RMS
over a 10Hz to
100kHz bandwidth. Designed for use in battery-powered
systems, the low 20μA quiescent current makes them an
ideal choice. In shutdown, quiescent current drops to less
than 0.1μA. 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 1μF. 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 1.2V, 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
10Hz to 100kHz Output Noise
5V Low Noise Regulator
IN
1μF
OUT
LT1761-5
SHDN
GND
BYP
1761 TA01
V
IN
5.4V TO
20V
0.01μF
+
5V AT100mA
20μV
RMS
NOISE
10μF
V
OUT
100μV/DIV
U
20μV
RMS
1761 G48
U
U
1761sfc
1
LT1761 Series
ABSOLUTE
AXI U
RATI GS
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW
IN 1
GND 2
BYP 3
4 ADJ
5 OUT
IN 1
GND 2
SHDN 3
S5 PACKAGE
5-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/ W
SEE THE APPLICATIONS INFORMATION SECTION.
S5 PACKAGE
5-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/ W
SEE THE APPLICATIONS INFORMATION SECTION.
ORDER PART
NUMBER
LT1761ES5-BYP
S5 PART
MARKING
LTGC
ORDER PART
NUMBER
LT1761ES5-SD
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
U
U
W
W W
U
W
(Note 1)
Output Short-Circuit Duration ......................... Indefinite
Operating Junction Temperature Range
E Grade (Note 2) ............................... – 40°C to 125°C
MP Grade (Note 2) ........................... – 55°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
5 OUT
IN 1
GND 2
4 ADJ
SHDN 3
TOP VIEW
5 OUT
4 BYP
S5 PACKAGE
5-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/ W
SEE THE APPLICATIONS INFORMATION SECTION.
S5 PART
MARKING
LTGH
ORDER PART
NUMBER
LT1761ES5-1.2
LT1761ES5-1.5
LT1761ES5-1.8
LT1761MPS5-1.8
LT1761ES5-2
LT1761ES5-2.5
LT1761ES5-2.8
LT1761ES5-3
LT1761ES5-3.3
LT1761ES5-5
S5 PART
MARKING
LTCDS
LTMT
LTJM
LTDCH
LTJE
LTGD
LTLB
LTGE
LTGF
LTGG
1761sfc
LT1761 Series
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C. (Note 2)
PARAMETER
CONDITIONS
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
1.185
1.170
1.150
1.478
1.457
1.436
1.775
1.750
1.725
1.970
1.945
1.920
2.465
2.435
2.415
2.762
2.732
2.706
2.960
2.930
2.900
3.250
3.230
3.190
4.935
4.900
4.850
1.205
1.190
1.170
TYP
1.8
1.2
1.2
1.2
1.5
1.5
1.5
1.8
1.8
1.8
2
2
2
2.5
2.5
2.5
2.8
2.8
2.8
3
3
3
3.3
3.3
3.3
5
5
5
1.220
1.220
1.220
1
1
1
1
1
1
1
1
1
1
MAX
2.3
1.215
1.230
1.240
1.522
1.538
1.555
1.825
1.845
1.860
2.030
2.045
2.060
2.535
2.565
2.575
2.838
2.868
2.884
3.040
3.070
3.090
3.350
3.370
3.400
5.065
5.100
5.120
1.235
1.250
1.260
10
10
10
10
10
10
10
10
10
10
UNITS
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
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
Minimum Input Voltage (Notes 3, 11) I
LOAD
= 100mA
Regulated Output Voltage
LT1761-1.2
V
IN
= 2V, I
LOAD
= 1mA
(Note 4)
2.3V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
2.3V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
LT1761-1.5
V
IN
= 2V, I
LOAD
= 1mA
2.5V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
2.5V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
V
IN
= 2.3V, I
LOAD
= 1mA
2.8V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
2.8V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
V
IN
= 2.5V, I
LOAD
= 1mA
3V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
3V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
V
IN
= 3V, I
LOAD
= 1mA
3.5V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
3.5V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
V
IN
= 3.3V, I
LOAD
= 1mA
3.8V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
3.8V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
V
IN
= 3.5V, I
LOAD
= 1mA
4V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
4V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
V
IN
= 3.8V, I
LOAD
= 1mA
4.3V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
4.3V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
V
IN
= 5.5V, I
LOAD
= 1mA
6V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
6V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
V
IN
= 2V, I
LOAD
= 1mA
2.3V < V
IN
< 20V, 1mA < I
LOAD
< 50mA
2.3V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
LT1761-1.8
LT1761-2
LT1761-2.5
LT1761-2.8
LT1761-3
LT1761-3.3
LT1761-5
ADJ Pin Voltage
(Note 3, 4)
Line Regulation
LT1761
LT1761-1.2
ΔV
IN
= 2V to 20V, I
LOAD
= 1mA
LT1761-1.5
ΔV
IN
= 2V to 20V, I
LOAD
= 1mA
LT1761-1.8
ΔV
IN
= 2.3V to 20V, I
LOAD
= 1mA
LT1761-2
ΔV
IN
= 2.5V to 20V, I
LOAD
= 1mA
LT1761-2.5
ΔV
IN
= 3V to 20V, I
LOAD
= 1mA
LT1761-2.8
ΔV
IN
= 3.3V to 20V, I
LOAD
= 1mA
LT1761-3
ΔV
IN
= 3.5V to 20V, I
LOAD
= 1mA
LT1761-3.3
ΔV
IN
= 3.8V to 20V, I
LOAD
= 1mA
LT1761-5
ΔV
IN
= 5.5V to 20V, I
LOAD
= 1mA
LT1761 (Note 3)
ΔV
IN
= 2V to 20V, I
LOAD
= 1mA
1761sfc
3
LT1761 Series
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C. (Note 2)
PARAMETER
Load Regulation
CONDITIONS
LT1761-1.2
V
IN
= 2.3V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 2.3V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 2.3V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 2.3V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 2.5V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 2.5V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 2.5V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 2.5V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 2.8V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 2.8V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 2.8V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 2.8V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 3V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 3V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 3V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 3V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 3.5V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 3.5V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 3.5V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 3.5V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 3.8V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 3.8V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 3.8V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 3.8V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 4V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 4V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 4V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 4V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 4.3V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 4.3V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 4.3V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 4.3V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 6V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 6V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 6V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 6V,
ΔI
LOAD
= 1mA to 100mA
●
MIN
TYP
1
1
MAX
6
12
12
50
20
35
30
55
20
35
30
60
20
35
35
65
20
35
40
80
20
38
40
86
20
40
40
90
20
40
40
100
30
60
65
150
6
12
12
50
0.15
0.19
0.22
0.29
0.28
0.38
0.35
0.45
UNITS
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
V
V
V
V
V
V
V
V
●
LT1761-1.5
10
●
14
●
LT1761-1.8
10
●
15
●
LT1761-2
10
●
15
●
LT1761-2.5
10
●
20
●
LT1761-2.8
10
●
20
●
LT1761-3
10
●
20
●
LT1761-3.3
10
●
20
●
LT1761-5
15
●
25
●
LT1761 (Note 3) V
IN
= 2.3V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 2.3V,
ΔI
LOAD
= 1mA to 50mA
V
IN
= 2.3V,
ΔI
LOAD
= 1mA to 100mA
V
IN
= 2.3V,
ΔI
LOAD
= 1mA to 100mA
Dropout Voltage
V
IN
= V
OUT(NOMINAL)
(Notes 5, 6, 11)
I
LOAD
= 1mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 100mA
1
●
1
●
0.10
●
0.17
●
0.24
●
0.30
●
1761sfc
4
LT1761 Series
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C. (Note 2)
PARAMETER
GND Pin Current
V
IN
= V
OUT(NOMINAL)
(Notes 5, 7)
CONDITIONS
I
LOAD
= 0mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 100mA
C
OUT
= 10μF, C
BYP
= 0.01μF, I
LOAD
= 100mA, 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
= 50mA
V
IN
= 7V, V
OUT
= 0V
V
IN
= V
OUT(NOMINAL)
+ 1V or 2.3V (Note 12),
ΔV
OUT
= – 5%
V
IN
= – 20V, V
OUT
= 0V
LT1761-1.2
V
OUT
= 1.2V, V
IN
< 1.2V
LT1761-1.5
V
OUT
= 1.5V, V
IN
< 1.5V
LT1761-1.8
V
OUT
= 1.8V, V
IN
< 1.8V
LT1761-2
V
OUT
= 2V, V
IN
< 2V
LT1761-2.5
V
OUT
= 2.5V, V
IN
< 2.5V
LT1761-2.8
V
OUT
= 2.8V, V
IN
< 2.8V
LT1761-3
V
OUT
= 3V, V
IN
< 3V
LT1761-3.3
V
OUT
= 3.3V, V
IN
< 3.3V
LT1761-5
V
OUT
= 5V, V
IN
< 5V
LT1761 (Note 3) V
OUT
= 1.22V, V
IN
< 1.22V
●
●
●
●
●
●
●
●
●
●
●
MIN
TYP
20
55
230
1
2.2
20
30
MAX
45
100
400
2
4
100
2
0.5
3
0.1
UNITS
μA
μA
μA
mA
mA
μV
RMS
nA
V
V
μA
μA
μA
dB
mA
mA
Output Voltage Noise
ADJ Pin Bias Current
Shutdown Threshold
SHDN Pin Current
(Note 9)
Quiescent Current in Shutdown
Ripple Rejection (Note 3)
Current Limit
Input Reverse Leakage Current
Reverse Output Current
(Note 10)
0.25
0.8
0.65
0
1
0.01
55
65
200
110
1
10
10
10
10
10
10
10
10
10
5
20
20
20
20
20
20
20
20
20
10
mA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
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 LT1761 regulators are tested and specified under pulse load
conditions such that T
J
≈
T
A
. The LT1761E is 100% production tested at
T
A
= 25°C. Performance at – 40°C and 125°C is assured by design,
characterization and correlation with statistical process controls. The
LT1761MP is 100% tested and guaranteed over the – 55°C to 125°C
temperature range.
Note 3:
The LT1761 (adjustable versions) are 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 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 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)
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, LT1761-1.2, 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.
Note 12:
To satisfy requirements for minimum input voltage, current limit
is tested at V
IN
= V
OUT(NOMINAL)
+ 1V or V
IN
= 2.3V, whichever is greater.
1761sfc
5
嵌入式系统
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