LT3008 Series
3µA I
Q
, 20mA, 45V
Low Dropout Linear Regulators
FEATURES
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DESCRIPTION
The LT
®
3008 series are micropower, low dropout voltage
(LDO) linear regulators. The devices supply 20mA output
current with a dropout voltage of 300mV. No-load quiescent
current is 3μA. Ground pin current remains at less than
5% of output current as load increases. In shutdown,
quiescent current is less than 1μA.
The LT3008 regulators optimize stability and transient
response with low ESR ceramic capacitors, requiring a
minimum of only 2.2μF The regulators do not require
.
the addition of ESR as is common with other regulators.
Internal protection circuitry includes current limiting,
thermal limiting, reverse-battery protection and reverse-
current protection.
The LT3008 series are ideal for applications that require
moderate output drive capability coupled with ultralow
standby power consumption. The device is available in
fixed output voltages of 1.2V, 1.5V, 1.8V, 2.5V, 3.3V and
5V, and an adjustable version with an output voltage range
of 0.6V to 44.5V. The LT3008 is available in the thermally
enhanced 6-lead DFN and 8-lead TSOT-23 packages.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Ultralow Quiescent Current: 3μA
Input Voltage Range: 2.0V to 45V
Output Current: 20mA
Dropout Voltage: 300mV
Adjustable Output (V
ADJ
= V
OUT(MIN)
= 600mV)
Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V
Output Tolerance:
±2%
Over Load, Line and
Temperature
Stable with Low ESR, Ceramic Output Capacitors
(2.2μF Minimum)
Shutdown Current: <1μA
Current Limit Protection
Reverse-Battery Protection
Thermal Limit Protection
TSOT-23 and 2mm
×
2mm DFN Packages
APPLICATIONS
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Automotive
Low Current Battery-Powered Systems
Keep-Alive Power Supplies
Remote Monitoring
Utility Meters
Low Power Industrial Applications
TYPICAL APPLICATION
3.3V, 20mA Supply with Shutdown
500
IN
1μF
LT3008-3.3
SHDN
SENSE
OUT
2.2μF
V
OUT
3.3V
20mA
450
DROPOUT VOLTAGE (mV)
400
350
300
250
200
150
100
50
0
–50 –25
0
0
25 50 75 100 125 150
TEMPERATURE (°C)
3008 TA01b
3008fa
Dropout Voltage/Quiescent Current
I
LOAD
= 20mA
6
DROPOUT
VOLTAGE
5
QUIESCENT CURRENT (μA)
4
3
2
1
V
IN
3.8V TO
45V
GND
3008 TA01a
I
Q
1
LT3008 Series
ABSOLUTE MAXIMUM RATINGS
(Note 1)
IN Pin Voltage .........................................................±50V
OUT Pin Voltage ......................................................±50V
Input-to-Output Differential Voltage ........................±50V
ADJ Pin Voltage ......................................................±50V
SENSE Pin Voltage ..................................................±50V
SHDN
Pin Voltage (Note 8) .....................................±50V
Output Short-Circuit Duration .......................... Indefinite
Operating Junction Temperature Range (Notes 2, 3)
LT3008E .............................................–40°C to 125°C
LT3008I ..............................................–40°C to 125°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature: Soldering, 10 sec
TS8 Package Only ............................................. 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
**SENSE/ADJ 1
OUT 2
OUT 3
7
6 GND
5 SHDN
4 IN
SHDN
GND
GND
GND
1
2
3
4
8
7
6
5
NC
ADJ/SENSE**
OUT
IN
DC PACKAGE
6-LEAD (2mm 2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 65°C/W TO 85°C/W*
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C,
θ
JA
= 65°C/W TO 85°C/W*
* See the Applications Information Section.
** SENSE for Fixed Voltage Output Versions.
ORDER INFORMATION
LEAD FREE FINISH
LT3008EDC#PBF
LT3008IDC#PBF
LT3008EDC-1.2#PBF
LT3008IDC-1.2#PBF
LT3008EDC-1.5#PBF
LT3008IDC-1.5#PBF
LT3008EDC-1.8#PBF
LT3008IDC-1.8#PBF
LT3008EDC-2.5#PBF
LT3008IDC-2.5#PBF
TAPE AND REEL
LT3008EDC#TRPBF
LT3008IDC#TRPBF
LT3008EDC-1.2#TRPBF
LT3008IDC-1.2#TRPBF
LT3008EDC-1.5#TRPBF
LT3008IDC-1.5#TRPBF
LT3008EDC-1.8#TRPBF
LT3008IDC-1.8#TRPBF
LT3008EDC-2.5#TRPBF
LT3008IDC-2.5#TRPBF
PART MARKING*
LDPS
LDPS
LFHC
LFHC
LFHF
LFHF
LFHH
LFHH
LFHK
LFHK
PACKAGE DESCRIPTION
6-Lead (2mm
×
2mm) Plastic DFN
6-Lead (2mm
×
2mm) Plastic DFN
6-Lead (2mm
×
2mm) Plastic DFN
6-Lead (2mm
×
2mm) Plastic DFN
6-Lead (2mm
×
2mm) Plastic DFN
6-Lead (2mm
×
2mm) Plastic DFN
6-Lead (2mm
×
2mm) Plastic DFN
6-Lead (2mm
×
2mm) Plastic DFN
6-Lead (2mm
×
2mm) Plastic DFN
6-Lead (2mm
×
2mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
3008fa
2
LT3008 Series
ORDER INFORMATION
LEAD FREE FINISH
LT3008ETS8-1.2
LT3008ITS8-1.2
LT3008ETS8-1.5
LT3008ITS8-1.5
LT3008ETS8-1.8
LT3008ITS8-1.8
LT3008ETS8-2.5
LT3008ITS8-2.5
LT3008ETS8-3.3
LT3008ITS8-3.3
LT3008ETS8-5
LT3008ITS8-5
TAPE AND REEL
LT3008ETS8-1.2#TR
LT3008ITS8-1.2#TR
LT3008ETS8-1.5#TR
LT3008ITS8-1.5#TR
LT3008ETS8-1.8#TR
LT3008ITS8-1.8#TR
LT3008ETS8-2.5#TR
LT3008ITS8-2.5#TR
LT3008ETS8-3.3#TR
LT3008ITS8-3.3#TR
LT3008ETS8-5#TR
LT3008ITS8-5#TR
PART MARKING*
LTFHD
LTFHD
LTFHG
LTFHG
LTFHJ
LTFHJ
LTFHM
LTFHM
LTFHP
LTFHP
LTFHR
LTFHR
PACKAGE DESCRIPTION
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
PARAMETER
Operating Voltage
Regulated Output Voltage
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. (Note 2)
CONDITIONS
l
MIN
2
1.188
1.176
1.485
1.47
1.782
1.764
2.475
2.45
3.267
3.234
4.95
4.9
594
588
TYP
1.2
1.2
1.5
1.5
1.8
1.8
2.5
2.5
3.3
3.3
5
5
600
600
1.2
1.5
1.8
2.5
3.3
5
0.6
MAX
45
1.212
1.224
1.515
1.53
1.818
1.836
2.525
2.55
3.333
3.366
5.05
5.1
606
612
6
7.5
9
12.5
16.5
25
3
UNITS
V
V
V
V
V
V
V
V
V
V
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
LT3008-1.2: V
IN
= 2V, I
LOAD
= 100μA
2V < V
IN
< 45V, 1μA < I
LOAD
< 20mA
LT3008-1.5: V
IN
= 2.05V, I
LOAD
= 100μA
2.05V < V
IN
< 45V, 1μA < I
LOAD
< 20mA
LT3008-1.8: V
IN
= 2.35V, I
LOAD
= 100μA
2.35V < V
IN
< 45V, 1μA < I
LOAD
< 20mA
LT3008-2.5: V
IN
= 3.05V, I
LOAD
= 100μA
3.05V < V
IN
< 45V, 1μA < I
LOAD
< 20mA
LT3008-3.3: V
IN
= 3.85V, I
LOAD
= 100μA
3.85V < V
IN
< 45V, 1μA < I
LOAD
< 20mA
LT3008-5: V
IN
= 5.55V, I
LOAD
= 100μA
5.55V < V
IN
< 45V, 1μA < I
LOAD
< 20mA
l
l
l
l
l
l
l
l
l
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l
l
l
l
ADJ Pin Voltage (Notes 3, 4)
Line Regulation (Note 3)
V
IN
= 2V, I
LOAD
= 100μA
2V < V
IN
< 45V, 1μA < I
LOAD
< 20mA
LT3008-1.2:
ΔV
IN
= 2V to 45V, I
LOAD
= 1mA
LT3008-1.5:
ΔV
IN
= 2.05V to 45V, I
LOAD
= 1mA
LT3008-1.8:
ΔV
IN
= 2.35V to 45V, I
LOAD
= 1mA
LT3008-2.5:
ΔV
IN
= 3.05V to 45V, I
LOAD
= 1mA
LT3008-3.3:
ΔV
IN
= 3.85V to 45V, I
LOAD
= 1mA
LT3008-5:
ΔV
IN
= 5.55V to 45V, I
LOAD
= 1mA
LT3008:
ΔV
IN
= 2V to 45V, I
LOAD
= 1mA
3008fa
4
LT3008 Series
ELECTRICAL CHARACTERISTICS
PARAMETER
Load Regulation (Note 3)
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. (Note 2)
CONDITIONS
LT3008-1.2: V
IN
= 2V, I
LOAD
= 1μA to 10mA
V
IN
= 2V, I
LOAD
= 1μA to 20mA
LT3008-1.5: V
IN
= 2.05V, I
LOAD
= 1μA to 10mA
V
IN
= 2.05V, I
LOAD
= 1μA to 20mA
LT3008-1.8: V
IN
= 2.35V, I
LOAD
= 1μA to 10mA
V
IN
= 2.35V, I
LOAD
= 1μA to 20mA
LT3008-2.5: V
IN
= 3.05V, I
LOAD
= 1μA to 10mA
V
IN
= 3.05V, I
LOAD
= 1μA to 20mA
LT3008-3.3: V
IN
= 3.85V, I
LOAD
= 1μA to 10mA
V
IN
= 3.85V, I
LOAD
= 1μA to 20mA
LT3008-5:
LT3008:
V
IN
= 5.55V, I
LOAD
= 1μA to 10mA
V
IN
= 5.55V, I
LOAD
= 1μA to 20mA
V
IN
= 2V, I
LOAD
= 1μA to 10mA
V
IN
= 2V, I
LOAD
= 1μA to 20mA
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
TYP
0.8
1
1
1.3
1.2
1.5
1.7
2.1
2.2
2.8
3.4
4.2
0.4
0.5
115
170
MAX
4
10
5
13
6
15
8.3
21
11
28
17
42
2
5
180
250
250
350
340
470
365
500
6
UNITS
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
μA
μA
μA
μA
μA
μA
μA
μV
RMS
nA
V
V
μA
μA
μA
Dropout Voltage
V
IN
= V
OUT(NOMINAL)
(Notes 5, 6)
I
LOAD
= 100μA
I
LOAD
= 100μA
I
LOAD
= 1mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 10mA
I
LOAD
= 20mA
I
LOAD
= 20mA
l
270
l
300
l
Quiescent Current (Notes 6, 7)
GND Pin Current
V
IN
= V
OUT(NOMINAL)
+ 0.5V (Notes 6, 7)
I
LOAD
= 0μA
I
LOAD
= 0μA
I
LOAD
= 0μA
I
LOAD
= 100μA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 20mA
C
OUT
= 2.2μF I
LOAD
= 20mA, BW = 10Hz to 100kHz
,
3
l
l
l
l
l
l
3
6
21
160
350
92
–10
0.4
0.67
0.61
0.65
6
12
50
500
1200
10
1.5
±1
2
<1
Output Voltage Noise (Note 9)
ADJ Pin Bias Current
Shutdown Threshold
SHDN
Pin Current
Quiescent Current in Shutdown
Ripple Rejection (Note 3)
V
OUT
= Off to On
V
OUT
= On to Off
V
SHDN
= 0V, V
IN
= 45V
V
SHDN
= 45V, V
IN
= 45V
V
IN
= 6V, V
SHDN
= 0V
V
IN
– V
OUT
= 2V, V
RIPPLE
= 0.5V
P-P
,
f
RIPPLE
= 120Hz, I
LOAD
= 20mA
LT3008
LT3008-1.2
LT3008-1.5
LT3008-1.8
LT3008-2.5
LT3008-3.3
LT3008-5
l
l
l
l
l
0.25
58
54
53
52
49
47
42
70
66
65
64
61
59
54
dB
dB
dB
dB
dB
dB
dB
3008fa
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嵌入式系统
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