LT3007ITS8-2.5#PBF [ADI]
LT3007ITS8-2.5#PBF;型号: | LT3007ITS8-2.5#PBF |
厂家: | ADI |
描述: | LT3007ITS8-2.5#PBF |
文件: | 总20页 (文件大小:336K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT3007 Series
µA I , 20mA, 45V
3
Q
Low Dropout Fault Tolerant
Linear Regulators
DESCRIPTION
The LT®3007 series are micropower, low dropout voltage
(LDO) linear regulators. The devices supply 20mA output
current with a dropout voltage of 300mV. No-load quies-
cent 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.
FEATURES
n
FMEA Fault Tolerant:
Output Stays at or Below Regulation Voltage During
Adjacent Pin Short or if a Pin Is Left Floating
n
Ultralow Quiescent Current: 3µA
n
Input Voltage Range: 2.0V to 45V
n
Output Current: 20mA
n
Dropout Voltage: 300mV
The LT3007 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.
n
Adjustable Output (V
= V
= 600mV)
ADJ
OUT(MIN)
n
n
Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V
Output Tolerance: ±2% Over Load, Line and
Temperature
n
Stable with Low ESR, Ceramic Output Capacitors
(2.2µF Minimum)
Shutdown Current: <1µA
Current Limit Protection
Reverse-Battery Protection
Thermal Limit Protection
TSOT-23 Package
n
n
n
n
n
The LT3007 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, andanadjustableversionwithanoutputvoltagerange
of 0.6V to 44.5V. The LT3007 is available in the thermally
enhanced 8-lead TSOT-23 package.
APPLICATIONS
n
Automotive
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered and ThinSOT is a
trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
n
Low Current Battery-Powered Systems
n
Keep-Alive Power Supplies
Remote Monitoring
Utility Meters
n
n
n
Low Power Industrial Applications
Dropout Voltage/Quiescent Current
TYPICAL APPLICATION
500
450
400
350
300
250
200
150
100
50
6
5
4
3
2
1
0
I
= 20mA
LOAD
3.3V, 20mA Supply with Shutdown
DROPOUT
VOLTAGE
V
OUT
3.3V
IN
OUT
LT3007-3.3
V
IN
20mA
3.8V TO
45V
2.2µF
1µF
I
Q
SHDN SENSE
GND
3007 TA01a
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3007 TA01b
3007fa
1
For more information www.linear.com/LT3007
LT3007 Series
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
(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, 4)
E-, I-Grades .......................................–40°C to 125°C
H-Grade .............................................–40°C to 150°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature: Soldering, 10 sec....................300°C
LT3007-ADJUSTABLE
TOP VIEW
8
7
6
5
ADJ
OUT
NC
SHDN
GND
GND
GND
1
2
3
4
IN
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
= 150°C, θ = 65°C/W TO 85°C/W*
JMAX
JA
LT3007-FIXED OUTPUTS
TOP VIEW
8
7
6
5
SENSE
OUT
NC
SHDN
GND
GND
GND
1
2
3
4
IN
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
= 125°C, θ = 65°C/W TO 85°C/W*
JA
JMAX
* See the Applications Information Section.
ORDER INFORMATION
LEAD FREE FINISH
LT3007ETS8#PBF
TAPE AND REEL
PART MARKING*
LTGJW
LTGJW
LTGJW
LTGKB
LTGKB
LTGKD
LTGKD
LTGJZ
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
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 150°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
–40°C to 125°C
LT3007ETS8#TRPBF
LT3007ITS8#PBF
LT3007ITS8#TRPBF
LT3007HTS8#PBF
LT3007HTS8#TRPBF
LT3007ETS8-1.2#TRPBF
LT3007ITS8-1.2#TRPBF
LT3007ETS8-1.5#TRPBF
LT3007ITS8-1.5#TRPBF
LT3007ETS8-1.8#TRPBF
LT3007ITS8-1.8#TRPBF
LT3007ETS8-2.5#TRPBF
LT3007ITS8-2.5#TRPBF
LT3007ETS8-3.3#TRPBF
LT3007ITS8-3.3#TRPBF
LT3007ETS8-5#TRPBF
LT3007ITS8-5#TRPBF
LT3007ETS8-1.2#PBF
LT3007ITS8-1.2#PBF
LT3007ETS8-1.5#PBF
LT3007ITS8-1.5#PBF
LT3007ETS8-1.8#PBF
LT3007ITS8-1.8#PBF
LT3007ETS8-2.5#PBF
LT3007ITS8-2.5#PBF
LT3007ETS8-3.3#PBF
LT3007ITS8-3.3#PBF
LT3007ETS8-5#PBF
LT3007ITS8-5#PBF
LTGJZ
LTGJX
LTGJX
LTGKC
LTGKC
LTGJY
LTGJY
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/
3007fa
2
For more information www.linear.com/LT3007
LT3007 Series
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
l
l
l
l
l
l
Operating Voltage
2
45
V
Regulated Output Voltage
LT3007-1.2: V = 2V, I
= 100µA
< 20mA
1.188
1.176
1.2
1.2
1.212
1.224
V
V
IN
LOAD
LOAD
2V < V < 45V, 1µA < I
IN
LT3007-1.5: V = 2.05V, I
= 100µA
< 20mA
1.485
1.47
1.5
1.5
1.515
1.53
V
V
IN
LOAD
LOAD
2.05V < V < 45V, 1µA < I
IN
LT3007-1.8: V = 2.35V, I
= 100µA
< 20mA
1.782
1.764
1.8
1.8
1.818
1.836
V
V
IN
LOAD
LOAD
2.35V < V < 45V, 1µA < I
IN
LT3007-2.5: V = 3.05V, I
= 100µA
< 20mA
2.475
2.45
2.5
2.5
2.525
2.55
V
V
IN
LOAD
LOAD
3.05V < V < 45V, 1µA < I
IN
LT3007-3.3: V = 3.85V, I
= 100µA
< 20mA
3.267
3.234
3.3
3.3
3.333
3.366
V
V
IN
LOAD
LOAD
3.85V < V < 45V, 1µA < I
IN
LT3007-5: V = 5.55V, I
= 100µA
4.95
4.9
5
5
5.05
5.1
V
V
IN
LOAD
5.55V < V < 45V, 1µA < I
< 20mA
LOAD
IN
ADJ Pin Voltage (Notes 3, 4)
Line Regulation (Note 3)
V
= 2V, I
IN
IN
= 100µA
594
588
582
600
600
606
612
612
mV
mV
mV
IN
LOAD
l
l
2V < V < 45V, 1µA < I
< 20mA (E-, I-Grades)
LOAD
LOAD
2V < V < 45V, 20µA < I
< 20mA (H-Grade)
l
l
l
l
l
l
l
l
LT3007-1.2: ∆V = 2V to 45V, I
= 1mA
1.2
1.5
1.8
2.5
3.3
5
6
7.5
9
mV
mV
mV
mV
mV
mV
mV
mV
IN
IN
IN
IN
LOAD
LT3007-1.5: ∆V = 2.05V to 45V, I
= 1mA
LOAD
LOAD
LOAD
LOAD
LT3007-1.8: ∆V = 2.35V to 45V, I
= 1mA
= 1mA
= 1mA
LT3007-2.5: ∆V = 3.05V to 45V, I
12.5
16.5
25
3
LT3007-3.3: ∆V = 3.85V to 45V, I
IN
LT3007-5: ∆V = 5.55V to 45V, I
= 1mA
IN
LOAD
LT3007 (E-, I-Grades): ∆V = 2V to 45V, I
= 1mA
0.6
0.6
IN
LOAD
LT3007 (H-Grade): ∆V = 2V to 45V, I
= 1mA
LOAD
9
IN
l
l
Load Regulation (Note 3)
LT3007-1.2: V = 2V, I
= 1µA to 10mA
= 1µA to 20mA
0.8
1
4
10
mV
mV
IN
LOAD
LOAD
V
= 2V, I
IN
l
l
LT3007-1.5: V = 2.05V, I
= 1µA to 10mA
= 1µA to 20mA
1
1.3
5
13
mV
mV
IN
LOAD
LOAD
V
= 2.05V, I
IN
l
l
LT3007-1.8: V = 2.35V, I
= 1µA to 10mA
= 1µA to 20mA
1.2
1.5
6
15
mV
mV
IN
LOAD
LOAD
V
= 2.35V, I
IN
l
l
LT3007-2.5: V = 3.05V, I
= 1µA to 10mA
= 1µA to 20mA
1.7
2.1
8.3
21
mV
mV
IN
LOAD
LOAD
V
= 3.05V, I
IN
l
l
LT3007-3.3: V = 3.85V, I
= 1µA to 10mA
= 1µA to 20mA
2.2
2.8
11
28
mV
mV
IN
LOAD
LOAD
V
= 3.85V, I
IN
l
l
LT3007-5:
V
IN
V
IN
= 5.55V, I
= 5.55V, I
= 1µA to 10mA
= 1µA to 20mA
3.4
4.2
17
42
mV
mV
LOAD
LOAD
l
l
l
l
LT3007 (E-, I-Grades): V = 2V, I
= 1µA to 10mA
= 1µA to 20mA
= 20µA to 10mA
= 20µA to 20mA
0.4
0.5
0.4
0.5
2
5
5
9
mV
mV
mV
mV
IN
LOAD
LOAD
LOAD
LOAD
V
IN
V
IN
V
IN
= 2V, I
= 2V, I
= 2V, I
LT3007 (H-Grade):
Dropout Voltage
= V
I
I
I
= 100µA
115
170
270
300
180
250
290
mV
mV
mV
LOAD
LOAD
LOAD
l
l
V
(Notes 5, 6)
OUT(NOMINAL)
= 100µA (E-, I-Grades)
= 100µA (H-Grade)
IN
I
I
I
= 1mA
= 1mA (E-, I-Grades)
= 1mA (H-Grade)
250
350
390
mV
mV
mV
LOAD
LOAD
LOAD
l
l
I
I
I
= 10mA
= 10mA (E-, I-Grades)
= 10mA (H-Grade)
340
470
510
mV
mV
mV
LOAD
LOAD
LOAD
l
l
I
I
I
= 20mA
= 20mA (E-, I-Grades)
= 20mA (H-Grade)
365
500
540
mV
mV
mV
LOAD
LOAD
LOAD
l
l
3007fa
3
For more information www.linear.com/LT3007
LT3007 Series
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
l
Quiescent Current (Notes 6, 7)
I
I
= 0µA (E-, I-Grades)
= 0µA (H-Grade)
3
6
7
µA
µA
LOAD
LOAD
l
l
l
l
l
l
l
GND Pin Current
IN
I
I
I
I
I
I
I
= 0µA (E-, I-Grades)
= 0µA (H-Grade)
= 100µA (E-, I-Grades)
= 100µA (H-Grade)
= 1mA
3
6
6
7
µA
µA
µA
µA
µA
µA
µA
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
V
= V
+ 0.5V (Notes 6, 7)
OUT(NOMINAL)
12
14
50
500
1200
21
160
350
= 10mA
= 20mA
Output Voltage Noise (Note 9)
ADJ Pin Bias Current
C
= 2.2µF, I
= 20mA, BW = 10Hz to 100kHz
92
µV
RMS
OUT
LOAD
–10
0.4
10
nA
l
l
Shutdown Threshold
V
OUT
V
OUT
= Off to On
= On to Off
0.67
0.61
1.5
V
V
0.25
l
l
SHDN Pin Current
V
SHDN
V
SHDN
= 0V, V = 45V
±1
2
µA
µA
IN
= 45V, V = 45V
0.65
IN
l
l
Quiescent Current in Shutdown
Ripple Rejection (Note 3)
V
V
= 6V, V
= 0V (E-, I-Grades)
<1
<9
µA
µA
IN
IN
SHDN
SHDN
= 6V, V
= 0V (H-Grade)
= 0.5V
V
– V
= 2V, V
,
P-P
IN
OUT
= 120Hz, I
RIPPLE
f
= 20mA
RIPPLE
LT3007
LOAD
58
54
53
52
49
47
42
70
66
65
64
61
59
54
dB
dB
dB
dB
dB
dB
dB
LT3007-1.2
LT3007-1.5
LT3007-1.8
LT3007-2.5
LT3007-3.3
LT3007-5
Current Limit (Note 3)
V
V
= 45V, V
= 0
75
mA
mA
IN
IN
OUT
OUT(NOMINAL)
l
l
= V
+ 1V, ∆V
= –5%
22
OUT
Input Reverse-Leakage Current
Reverse-Output Current
V
V
= –45V, V
= 0
OUT
1
30
10
µA
µA
IN
= 1.2V, V = 0
0.6
OUT
IN
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 5: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout,
the output voltage equals (V – V
). For the LT3007-1.2 and
DROPOUT
IN
LT3007-1.5, dropout voltage will be limited by the minimum input voltage.
Note 2: The LT3007 is tested and specified under pulse load conditions
Note 6: To satisfy minimum input voltage requirements, the LT3007
adjustable version is tested and specified for these conditions with an
such that T @ T . The LT3007E regulators are 100% tested at T = 25°C
J
A
A
and performance is guaranteed from 0°C to 125°C. Performance at
−40°C to 125°C is assured by design, characterization and correlation
with statistical process controls. The LT3007I regulators are guaranteed
over the full −40°C to 125°C operating junction temperature range.
The LT3007H regulator is 100% tested at the 150°C operating junction
temperature. High junction temperatures degrade operating lifetimes.
Operating lifetime is derated at junction temperature greater than 125°C.
H-grade is available only in the adjustable version.
external resistor divider (61.9k bottom, 280k top) which sets V
The external resistor divider adds 9.69µA of DC load on the output. This
external current is not factored into GND pin current.
to 3.3V.
OUT
Note 7: GND pin current is tested with V = V
+ 0.55V and
IN
OUT(NOMINAL)
a current source load. GND pin current will increase in dropout. For the
fixed output voltage versions, an internal resistor divider will add about
1μA to the GND pin current. See the GND Pin Current curves in the Typical
Performance Characteristics section.
Note 3: The LT3007 adjustable version is tested and specified for these
conditions with the ADJ pin connected to the OUT pin.
Note 8: The SHDN pin can be driven below GND only when tied to the IN
pin directly or through a pull-up resistor. If the SHDN pin is driven below
GND by more than –0.3V while IN is powered, the output will turn on.
Note 9: Output noise is listed for the adjustable version with the ADJ pin
connected to the OUT pin. See the RMS Output Noise vs Load Current
curve in the Typical Performance Characteristics Section.
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 the maximum input voltage, the output current range must be
limited. When operating at the maximum output current, the input voltage
must be limited.
3007fa
4
For more information www.linear.com/LT3007
LT3007 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Dropout Voltage
Dropout Voltage
Minimum Input Voltage
450
400
350
300
250
200
150
100
50
450
400
350
300
250
200
150
100
50
2.0
1.8
1.6
1.4
1.2
1
I
= 20mA
LOAD
T = 125°C
J
T = 150°C
J
20mA
1mA
10mA
100µA
T = 25°C
J
0.8
0.6
0.4
0.2
0
0
0
0
5
10
15
20
–50 –25
0
25 50 75 100 125 150
–50 –25
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
TEMPERATURE (°C)
3007 G01
3007 G03
3007 G02
ADJ Pin Voltage
Output Voltage LT3007-1.2
Output Voltage LT3007-1.5
0.612
0.610
0.608
0.606
0.604
0.602
0.600
0.598
0.596
0.594
0.592
0.590
0.588
1.224
1.220
1.216
1.212
1.208
1.204
1.200
1.196
1.192
1.188
1.184
1.180
1.176
1.530
1.525
1.520
1.515
1.510
1.505
1.500
1.495
1.490
1.485
1.480
1.475
1.470
I
= 100µA
I
= 100µA
LOAD
I
= 100µA
LOAD
LOAD
–50 –25
0
25 50 75 100 125 150
–50 –25
0
25 50 75 100 125 150
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
3007 G05
3007 G06
3007 G04
Output Voltage LT3007-1.8
Output Voltage LT3007-2.5
Output Voltage LT3007-3.3
3.366
1.836
1.830
1.824
1.816
1.812
1.806
1.800
1.794
1.788
1.782
1.776
1.770
1.764
2.550
2.540
I
= 100µA
I
= 100µA
I
= 100µA
LOAD
LOAD
LOAD
3.355
3.344
2.530
2.520
3.333
3.322
3.311
3.300
3.289
3.278
3.267
3.256
3.245
3.234
2.510
2.500
2.490
2.480
2.470
2.460
2.450
–50 –25
0
25 50 75 100 125 150
–50 –25
0
25 50 75 100 125 150
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
3007 G09
3007 G07
3007 G08
3007fa
5
For more information www.linear.com/LT3007
LT3007 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Output Voltage LT3007-5
ADJ Pin Bias Current
Adjustable Quiescent Current
5.100
5.075
5.050
5.025
10
8
6
5
4
3
2
1
0
I
= 100µA
LOAD
6
4
2
5.000
4.975
4.950
4.925
4.900
0
–2
–4
–6
–8
–10
–50 –25
0
25 50 75 100 125 150
–50 –25
0
25 50 75 100 125 150
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
3007 G10
3007 G11
3007 G12
Quiescent Current
GND Pin Current LT3007-1.2
GND Pin Current LT3007-1.5
30
27
24
21
18
15
12
9
500
450
400
350
300
250
200
150
100
50
500
450
400
350
300
250
200
150
100
50
LT3007-1.2
LT3007-1.5
LT3007-1.8
LT3007-2.5
LT3007-3.3
LT3007-5
R
= 75Ω, I = 20mA
L
L
R
= 60Ω, I = 20mA
L
L
R
L
= 150Ω, I = 10mA
L
R
L
= 120Ω, I = 10mA
L
6
R
L
= 15k, I = 100µA
L
R
L
= 12k, I = 100µA
L
3
R
L
= 1.5k, I = 1mA
L
R
L
= 1.2k, I = 1mA
L
0
0
0
0
1
2
3
4
5
6
7
8
9 10
0
2
3
4
5
6
7
8
9
10
0
2
3
4
5
6
7
8
9
10
1
1
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3007 G15
3007 G14
3007 G13
GND Pin Current LT3007-1.8
GND Pin Current LT3007-2.5
GND Pin Current LT3007-3.3
500
450
400
350
300
250
200
150
100
50
500
450
400
350
300
250
200
150
100
50
500
450
400
350
300
250
200
150
100
50
R
= 165Ω, I = 20mA
L
L
R
L
= 90Ω, I = 20mA
R
= 125Ω, I = 20mA
L
L
L
R
L
= 330Ω, I = 10mA
L
R
L
= 180Ω, I = 10mA
L
R = 250Ω, I = 10mA
L L
R
L
= 33k, I = 100µA
L
R
2
= 25k, I = 100µA
L
R
L
= 18k, I = 100µA
L
L
R
L
= 1.8k, I = 1mA
R = 3.3k, I = 1mA
L L
R
L
= 2.5k, I = 1mA
L
L
0
0
0
0
2
3
4
5
6
7
8
9
10
0
3
4
5
6
7
8
9
10
0
2
3
4
5
6
7
8
9
10
1
1
1
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3007 G16
3007 G17
3007 G18
3007fa
6
For more information www.linear.com/LT3007
LT3007 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
GND Pin Current vs ILOAD
SHDN Pin Thresholds
GND Pin Current LT3007-5
500
450
400
350
300
250
200
150
100
50
1000
100
10
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
V
= 3.8V
IN
OUT
= 3.3V
R
= 250Ω, I = 20mA
L
L
OFF TO ON
ON TO OFF
R
L
= 500Ω, I = 10mA
L
R
L
= 50k, I = 100µA
L
R
L
= 5k, I = 1mA
L
0
1
0
2
3
4
5
6
7
8
9
10
0.001
0.01
0.1
1
10
100
–50
0
25 50 75 100
TEMPERATURE (°C)
125 150
1
–25
INPUT VOLTAGE (V)
LOAD (mA)
3007 G19
3007 G21
3007 G20
Current Limit
SHDN Pin Input Current
SHDN Pin Input Current
2.0
1.8
1.6
1.4
1.2
1
2.0
1.8
1.6
1.4
1.2
1
100
90
80
70
60
50
40
30
20
10
0
V
OUT
= 0V
V
= 45V
IN
V = 2V
IN
V
= 45V
0.8
0.6
0.4
0.2
0
SHDN
0.8
0.6
0.4
0.2
0
–50
–25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3007 G23
0
5
10 15 20 25 30 35 40 45
SHDN PIN VOLTAGE (V)
3007 G22
–50
0
25 50 75 100 125 150
TEMPERATURE (°C)
3007 G24
–25
Reverse-Output Current
Input Ripple Rejection
Input Ripple Rejection
50
45
40
35
30
25
20
15
10
5
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
V
V
= 2.1V + 50mV
RMS
OUT
LOAD
OUT = ADJ = 1.2V
IN = SHDN = GND
IN
= 600mV
= 20mA
I
C
OUT
= 10µF
ADJ
V
= V
(NOMINAL) + 2V + 0.5V
OUT P-P
C
OUT
= 2.2µF
IN
RIPPLE AT f = 120Hz
= 20mA
OUT
I
LOAD
0
25 50 75 100 125 150
TEMPERATURE (°C)
3007 G25
10
100
1000
10000 100000 1000000
–50
0
–25
125 150
–50
0
25 50 75 100
TEMPERATURE (°C)
–25
FREQUENCY (Hz)
3007 G26
3007 G27
3007fa
7
For more information www.linear.com/LT3007
LT3007 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
RMS Output Noise
vs Load Current
Load Regulation
Output Noise Spectral Density
5
4
500
450
100
10
1
C
OUT
= 10µF
V
V
= 0.6V
C
I
= 2.2µF
= 20mA
5V
5V
OUT
IN
OUT
= 2.1V
3.3V
2.5V
1.8V
1.5V
1V
LOAD
400
350
3.3V
3
300
250
200
150
0.6V
2.5V
1.8V
2
1
1.5V
∆I = 1μA TO 20mA
L
1.2V
0.6V
100
50
0
0
∆I = 20μA TO 20mA
L
–1
–50 –25
0.1
0
25 50 75 100 125 150
0.01
0.1
I
1
100
0.001
10
10
100
1k
10k
100k
TEMPERATURE (°C)
(mA)
FREQUENCY (Hz)
LOAD
3007 G28
3007 G29
3007 G30
Transient Response
Transient Response
Transient Response (Load Dump)
I
= 1mA TO 20mA
= 5.5V
OUT
IN
I
= 1mA TO 20mA
= 5.5V
OUT
IN
V
V
C
V
V
C
V
= 5V
OUT
OUT
OUT
= 5V
OUT
OUT
50mV/DIV
= 2.2µF
= 10µF
V
OUT
V
OUT
45V
12V
50mV/DIV
50mV/DIV
V
I
= 5V
= 20mA
= 4.7µF
OUT
OUT
C
OUT
V
IN
I
10V/DIV
OUT
I
OUT
20mA/DIV
20mA/DIV
3007 G31
3007 G32
3007 G33
500µs/DIV
500µs/DIV
1ms/DIV
3007fa
8
For more information www.linear.com/LT3007
LT3007 Series
PIN FUNCTIONS
SHDN (Pin 1): Shutdown. Pulling the SHDN pin low puts
ADJ(Pin8):Adjust.Thispinistheerroramplifier’sinverting
terminal. Its 400pA typical input bias current flows out of
the pin (see curve of ADJ Pin Bias Current vs Temperature
in the Typical Performance Characteristics section). The
ADJ pin voltage is 600mV referenced to GND and the
output voltage range is 600mV to 44.5V.
the LT3007 into a low power state and turns the output
off. If unused, tie the SHDN pin to V . The LT3007 does
IN
not function if the SHDN pin is not connected. The SHDN
pin cannot be driven below GND unless tied to the IN pin.
If the SHDN pin is driven below GND while IN is powered,
the output will turn on. SHDN pin logic cannot be refer-
enced to a negative rail.
SENSE (Pin 8): Sense. For fixed voltage versions of the
LT3007 (LT3007-1.2, LT3007-1.5, LT3007-1.8, LT3007-
2.5, LT3007-3.3, LT3007-5), the SENSE pin is the input to
the error amplifier. Optimum regulation is obtained at the
point where the SENSE pin is connected to the OUT pin of
the regulator. In critical applications, small voltage drops
are caused by the resistance (RP) of PC traces between
the regulator and the load. These may be eliminated by
connecting the SENSE pin to the output at the load as
shown in Figure 1 (Kelvin Sense Connection). Note that
the voltage drop across the external PC traces add to the
dropoutvoltageoftheregulator.TheSENSEpinbiascurrent
is 1µA at the nominal rated output voltage. The SENSE pin
can be pulled below ground (as in a dual supply system
where the regulator load is returned to a negative supply)
and still allow the device to start and operate.
GND (Pins 2, 3, 4): Ground. Connect the bottom of the
resistor divider that sets output voltage directly to GND
for the best regulation.
IN (Pin 5): Input. The IN pin supplies power to the device.
The LT3007 requires a bypass capacitor at IN if the device
is more than six inches away from the main input filter
capacitor. In general, the output impedance of a battery
rises with frequency, so it is advisable to include a bypass
capacitor in battery-powered circuits. A bypass capacitor
in the range of 0.1µF to 10µF will suffice. The LT3007
withstands reverse voltages on the IN pin with respect to
ground and the OUT pin. In the case of a reversed input,
which occurs with a battery plugged in backwards, the
LT3007 acts as if a blocking diode is in series with its
input. No reverse current flows into the LT3007 and no
reverse voltage appears at the load. The device protects
both itself and the load.
R
P
IN
OUT
LT3007
+
+
SHDN SENSE
LOAD
V
IN
NC (Pin 6): No Connect. Pin 6 is an NC pin in the TSOT-23
package. This pin is not tied to any internal circuitry. LTC
recommends that the NC pin be floated for fault tolerant
operation.
GND
3007 F01
R
P
Figure 1. Kelvin Sense Connection
OUT (Pin 7): Output. This pin supplies power to the load.
Use a minimum output capacitor of 2.2µF to prevent os-
cillations. Large load transient applications require larger
output capacitors to limit peak voltage transients. See the
Applications Information section for more information on
output capacitance and reverse-output characteristics.
3007fa
9
For more information www.linear.com/LT3007
LT3007 Series
APPLICATIONS INFORMATION
The LT3007 is a low dropout linear regulator with ultra-
low quiescent current and shutdown. Quiescent current is
extremely low at 3µA and drops well below 1µA in shut-
down. The device supplies up to 20mA of output current.
Dropout voltage at 20mA is typically 300mV. The LT3007
incorporatesseveralprotectionfeatures,makingitidealfor
useinbattery-poweredsystems.Thedeviceprotectsitself
against both reverse-input and reverse-output voltages.
In battery backup applications, where a backup battery
holds up the output when the input is pulled to ground,
the LT3007 acts as if a blocking diode is in series with its
output and prevents reverse current flow. In applications
where the regulator load returns to a negative supply, the
output can be pulled below ground by as much as 50V
without affecting start-up or normal operation.
and the divider current is zero. Curves of ADJ Pin Voltage vs
TemperatureandADJPinBiasCurrentvsTemperatureappear
in the Typical Performance Characteristics.
Specifications for output voltages greater than 0.6V are
proportional to the ratio of the desired output voltage to
0.6V:V /0.6V.Forexample,loadregulationforanoutput
OUT
current change of 100µA to 20mA is –0.5mV typical at
V
= 0.6V. At V
= 5V, load regulation is:
OUT
OUT
5V
0.6V
• (−0.5mV)= −4.17mV
Table 1 shows resistor divider values for some common
outputvoltageswitharesistordividercurrentofabout1µA.
Table 1. Output Voltage Resistor Divider Values
V
R1
R2
OUT
Care must be taken when designing LT3007 applications
to operate at temperatures greater than 125°C. See the
HighTemperatureOperationSectionformoreinformation.
1V
1.2V
1.5V
1.8V
2.5V
3V
604k
590k
590k
590k
590k
590k
619k
590k
402k
590k
887k
Adjustable Operation
1.18M
1.87M
2.37M
2.8M
4.32M
The LT3007 has an output voltage range of 0.6V to 44.5V.
Figure 2 shows that output voltage is set by the ratio of two
external resistors. The IC regulates the output to maintain the
ADJ pin voltage at 600mV referenced to ground. The current
in R1 equals 600mV/R1 and the current in R2 is the current
in R1 minus the ADJ pin bias current. The ADJ pin bias cur-
rent, typically 400pA at 25°C, flows out of the pin. Calculate
the output voltage using the formula in Figure 2. An R1 value
of 619k sets the divider current to 0.97µA. Do not make R1’s
value any greater than 619kto minimize output voltage errors
due to the ADJ pin bias current and to insure stability under
minimum load conditions. In shutdown, the output turns off
3.3V
5V
Because the ADJ pin is relatively high impedance (de-
pendingontheresistordividerused),straycapacitances
atthispinshouldbeminimized.Specialattentionshould
be given to any stray capacitances that can couple ex-
ternal signals onto the ADJ pin, producing undesirable
output transients or ripple.
Extra care should be taken in assembly when using high
valuedresistors.Smallamountsofboardcontamination
canleadtosignificantshiftsinoutputvoltage.Appropriate
post-assembly board cleaning measures should be
implemented to prevent board contamination. If the
board is to be subjected to humidity cycling or if board
cleaningmeasurescannotbeguaranteed,consideration
shouldbegiventousingresistorsanorderofmagnitude
smaller than in Table 1 to prevent contamination from
causing unwanted shifts in the output voltage. A fixed
voltage option in the LT3007 series does not need these
special considerations.
V
OUT
IN
OUT
V
IN
LT3007
R2
R1
SHDN
GND
ADJ
3007 F02
V
V
= 600mV • (1 + R2/R1) – (I
• R2)
ADJ
OUT
ADJ
= 600mV
I
= 0.4nA at 25°C
OUTPUT RANGE = 0.6V to 44.5V
ADJ
Figure 2. Adjustable Operation
3007fa
10
For more information www.linear.com/LT3007
LT3007 Series
APPLICATIONS INFORMATION
Output Capacitance and Transient Response
over the operating temperature range. The X5R and X7R
dielectrics yield more stable characteristics and are more
suitable for use as the output capacitor. The X7R type has
better stability across temperature, while the X5R is less
expensive and is available in higher values. One must still
exercise care when using X5R and X7R capacitors; the
X5R and X7R codes only specify operating temperature
rangeandmaximumcapacitancechangeovertemperature.
Capacitance change due to DC bias with X5R and X7R
capacitors is better than Y5V and Z5U capacitors, but can
still be significant enough to drop capacitor values below
appropriate levels. Capacitor DC bias characteristics tend
toimproveascomponentcasesizeincreases,butexpected
capacitance at operating voltage should be verified.
The LT3007 is stable with a wide range of output capaci-
tors.TheESRoftheoutputcapacitoraffectsstability,most
notably with small capacitors. Use a minimum output
capacitor of 2.2µF with an ESR of 3Ω or less to prevent
oscillations.TheLT3007isamicropowerdeviceandoutput
loadtransientresponseisafunctionofoutputcapacitance.
Larger values of output capacitance decrease the peak
deviations and provide improved transient response for
larger load current changes.
Give extra consideration to the use of ceramic capacitors.
Manufacturers make ceramic capacitors with a variety of
dielectrics,eachwithdifferentbehavioracrosstemperature
and applied voltage. The most common dielectrics are
specified with EIA temperature characteristic codes of
Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics
provide high C-V products in a small package at low cost,
but exhibit strong voltage and temperature coefficients as
shown in Figures 3 and 4. When used with a 5V regulator,
a 16V 10µF Y5V capacitor can exhibit an effective value
as low as 1µF to 2µF for the DC bias voltage applied and
Voltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress,
similar to the way a piezoelectric accelerometer or micro-
phone works. For a ceramic capacitor, the stress can be
induced by vibrations in the system or thermal transients.
40
20
20
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
0
X5R
X5R
0
–20
–20
–40
–40
Y5V
–60
–60
Y5V
–80
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
–100
–100
–50 –25
0
25
50
TEMPERATURE (°C)
75
100 125
0
8
12 14
2
4
6
10
16
DC BIAS VOLTAGE (V)
3007 F04
3007 F03
Figure 3. Ceramic Capacitor DC Bias Characteristics
Figure 4. Ceramic Capacitor Temperature Characteristics
3007fa
11
For more information www.linear.com/LT3007
LT3007 Series
APPLICATIONS INFORMATION
The resulting voltages produced can cause appreciable
amounts of noise, especially when a ceramic capacitor is
used for noise bypassing. A ceramic capacitor produced
Figure 5’s trace in response to light tapping from a pencil.
Similar vibration induced behavior can masquerade as
increased output voltage noise.
Table 2. Feedforward Capacitor Values
NOMINAL V FEEDFORWARD CAPACITANCE
OUT
1.2 < V
2.5 < V
≤ 2.5
≤ 7.5
470pF/μA • I
220pF/μA • I
100pF/μA • I
(μA)
(μA)
(μA)
OUT
OUT
FB-DIVIDER
FB-DIVIDER
FB-DIVIDER
V
OUT
> 7.5
For example, a 5V output with a 1μA current flowing in
the feedback resistor divider:
V
C
LOAD
= 0.6V
= 22µF
= 10µA
OUT
OUT
I
C = 220pF/μA • 1μA = 220pF
FF
V
OUT
500µV/DIV
C
= 0
FF
V
OUT
C
FF
= 220pF
100mV/DIV
3007 F05
100ms/DIV
V
C
= 5V
OUT
OUT
= 10µF
Figure 5. Noise Resulting from Tapping
on a Ceramic Capacitor
I
= 1µA
FB-DIVIDER
LOAD CURRENT
2mA TO 20mA
3007 F07
500µs/DIV
Feedforward Capacitance
Using a feedforward capacitor (C ) from V
Figure 7. Transient Response with
Feedforward Capacitor
to the ADJ
OUT
FF
pin of the LT3007 improves transient response for output
voltages greater than 0.6V. With no feedforward capaci-
tor, the settling time will increase as the output voltage
is raised above 0.6V. A 4.7μF minimum output capacitor
with an ESR of no more than 3Ω is required when using
a feedforward capacitor. Use Table 2 to determine the
Start-uptimeisaffectedbytheuseofafeedforwardcapaci-
tor. Start-up time is directly proportional to the size of the
feedforward capacitorand outputvoltage, andis inversely
proportional to the feedback resistor divider current.
Theuseofafeedforwardcapacitorisrequiredforoperation
at junction temperatures above 135°C in order to ensure
good transient response.
recommended value of C to achieve optimal transient
FF
response while maintaining stability. Round up to the
nearest standard capacitor value.
C
= 0
FF
V
IN
OUT
ADJ
OUT
V
C
C
IN
FF
OUT
LT3007
V
OUT
C
FF
= 4700pF
R2
R1
200mV/DIV
SHDN
GND
V
C
= 5V
OUT
OUT
= 10µF
VOUT
R1+R2
IFB-DIVIDER
=
I
= 20µA
FB-DIVIDER
LOAD CURRENT
2mA TO 20mA
3007 F06
3007 F08
500µs/DIV
Figure 6. Feedforward Capacitor
Figure 8. Transient Response with
Feedforward Capacitor at 150°C
3007fa
12
For more information www.linear.com/LT3007
LT3007 Series
APPLICATIONS INFORMATION
Thermal Considerations
layer GND planes achieves 45°C/W thermal resistance.
This is approximately a 30% improvement over the lowest
numbers shown in Table 3.
The LT3007’s maximum rated junction temperature of
125°C limits its power-handling capability. Two compo-
nents comprise the power dissipated by the device:
Table 3: Measured Thermal Resistance for TSOT-23 Package
COPPER AREA
1. Output current multiplied by the input/output voltage
BOARD
AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
TOPSIDE*
BACKSIDE
differential: I
• (V – V
)
OUT
IN
OUT
2
2
2
2
2
2
2
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
65°C/W
67°C/W
70°C/W
75°C/W
85°C/W
2. GND pin current multiplied by the input voltage:
• V
2
2
1000mm
2500mm
I
GND
IN
2
2
225mm
2500mm
GND pin current is found by examining the GND Pin Cur-
rent curves in the Typical Performance Characteristics
section. Power dissipation is equal to the sum of the two
components listed prior.
2
2
100mm
2500mm
2
2
50mm
2500mm
*Device is mounted on the topside.
Calculating Junction Temperature
TheLT3007regulatorhasinternalthermallimitingdesigned
to protect the device during overload conditions. For con-
tinuous normal conditions, do not exceed the maximum
junction temperature rating of 125°C. Carefully consider
all sources of thermal resistance from junction to ambi-
ent including other heat sources mounted in proximity to
the LT3007. For surface mount devices, heat sinking is
accomplished by using the heat spreading capabilities of
the PC board and its copper traces. Copper board stiffen-
ers and plated through-holes can also be used to spread
the heat generated by power devices.
Example: Given an output voltage of 3.3V, an input volt-
age range of 12V 5%, an output current range of 0mA
to 20mA and a maximum ambient temperature of 85°C,
what will the maximum junction temperature be?
The power dissipated by the device is equal to:
I
(V
– V ) + I
(V
)
OUT(MAX) IN(MAX)
OUT
GND IN(MAX)
where,
I
= 20mA
= 12.6V
OUT(MAX)
The following tables list thermal resistance for several
different board sizes and copper areas. All measurements
were taken in still air on 3/32" FR-4 two-layer boards with
one ounce copper.
V
IN(MAX)
I
at (I = 20mA, V = 12.6V) = 0.3mA
OUT IN
GND
So,
P = 20mA(12.6V – 3.3V) + 0.3mA(12.6V) = 189.8mW
PCB layers, copper weight, board layout and thermal vias
affect the resultant thermal resistance. Although Table 2
provides thermal resistance numbers for 2-layer boards
with1ouncecopper,modernmultilayerPCBsprovidebet-
ter performance than found in these tables. For example,
a 4-layer, 1 ounce copper PCB board with three thermal
vias from the three fused TSOT-23 GND pins to inner
The thermal resistance ranges from 65°C/W to 85°C/W
dependingonthecopperarea.So,thejunctiontemperature
rise above ambient approximately equals:
0.1898W(75°C/W) = 14.2°C
3007fa
13
For more information www.linear.com/LT3007
LT3007 Series
APPLICATIONS INFORMATION
The maximum junction temperature equals the maximum
junctiontemperatureriseaboveambientplusthemaximum
ambient temperature or:
Operation of the LT3007 at temperatures above 125°C
requires careful selection of external components to
ensure output regulation, stability and optimal transient
response. Figures 9 and 10 have curves showing power
device leakage (from IN to OUT) for the LT3007 in both
active and shutdown states. The minimum external load
must be greater than this leakage to prevent the OUT pin
from rising out of regulation due to power device leakage.
Power device leakage decreases if the LT3007 is active;
if IN is tied directly to SHDN, the minimum required load
is reduced. The recommended minimum external load is
20µA. The use of a feedforward capacitor is required for
operation at temperatures above 135°C (see Feedforward
Capacitance section). For output voltages of 1.2V and
above, the feedforward capacitor ensures good transient
response. UseoftheLT3007attemperaturesabove135°C
and output voltages under 1.2V is not advised.
T
= 85°C + 14.2°C = 99.2°C
J(MAX)
High Temperature Operation
CaremustbetakenwhendesigningLT3007applicationsto
operate at high ambient temperatures. The LT3007 works
at elevated temperatures but erratic operation can occur
due to unforeseen variations in external components.
Some tantalum capacitors are available for high tempera-
ture operation, but ESR is often several Ohms; capacitor
ESR above 3Ω is unsuitable for use with the LT3007.
Ceramic capacitor manufacturers (Murata, AVX, TDK,
and Vishay at the time of this writing) now offer ceramic
capacitorsthatareratedto150°CusinganX8Rdielectric.
Device instability will occur if the output capacitor value
and ESR are outside design limits at elevated tempera-
ture and operating DC voltage bias (see information on
capacitor characteristics under Output Capacitance and
Transient Response). Check each passive component
for absolute value and voltage ratings over the operating
temperature range.
Leakage in capacitors, or from solder flux left after insuf-
ficient board cleaning, adversely affects the low quiescent
currentoperation.Considerjunctiontemperatureincrease
due to power dissipation in both the junction and nearby
components to ensure maximum specifications are not
violated for the LT3007 or external components.
10
2.0
V
V
= 0V
= 0V
OUT
ADJ
V
V
= 0V
= 0.7V
OUT
ADJ
9
8
7
6
5
4
3
2
1
0
1.8
1.6
1.4
1.2
1
V
= 45V
IN
V
IN
= 45V
0.8
0.6
0.4
0.2
0
V
= 2.1V
IN
V
IN
= 2.1V
100
110
120
130
140
150
100
110
120
130
140
150
TEMPERATURE (°C)
TEMPERATURE (°C)
3007 F09
3007 F10
Figure 9. Power Device Leakage, SHDN = 0V
Figure 10. Power Device Leakage, SHDN = 1.5V
3007fa
14
For more information www.linear.com/LT3007
LT3007 Series
APPLICATIONS INFORMATION
Protection Features
The LT3007 incurs no damage if OUT is pulled below
ground. If IN is left open circuit or grounded, OUT can be
pulled below ground by 50V. No current flows from the
pass transistor connected to OUT. However, current flows
in (but is limited by) the resistor divider that sets output
voltage. Current flows from the bottom resistor in the
divider and from the ADJ pin’s internal clamp through the
top resistor in the divider to the external circuitry pulling
OUT below ground. If IN is powered by a voltage source,
OUT sources current equal to its current limit capability
andtheLT3007protectsitselfbythermallimitingifneces-
sary. In this case, grounding the SHDN pin turns off the
LT3007 and stops OUT from sourcing current.
The LT3007 incorporates several protection features that
make it ideal for use in battery-powered circuits. In ad-
dition to the normal protection features associated with
monolithicregulators,suchascurrentlimitingandthermal
limiting, the device also protects against reverse-input
voltages, reverse-output voltages and reverse output-to-
input voltages.
Current limit protection and thermal overload protection
protect the device against current overload conditions at
the output of the device. For normal operation, do not ex-
ceed a junction temperature of 125°C. The typical thermal
shutdown circuitry temperature threshold is 160°C.
The LT3007 incurs no damage if the ADJ pin is pulled
above or below ground by 50V. If IN is left open circuit or
grounded, ADJ acts like a 100k resistor in series with a
diode when pulled above or below ground.
The IN pin withstands reverse voltages of 50V. The de-
vice limits current flow to less than 30µA (typically less
than 1µA) and no negative voltage appears at OUT. The
device protects both itself and the load against batteries
that are plugged in backwards.
In circuits where a backup battery is required, several
different input/output conditions can occur. The output
voltage may be held up while the input is either pulled
to ground, pulled to some intermediate voltage or is left
open circuit. Current flow back into the output follows the
curve shown in Figure 11.
The SHDN pin cannot be driven below GND unless tied to
the IN pin. If the SHDN pin is driven below GND while IN
is powered, the output will turn on. SHDN pin logic cannot
be referenced to a negative rail.
100
90
80
70
60
50
40
30
20
10
0
ADJ CURRENT
OUT CURRENT
0
1
2
3
4
5
6
7
8
9
10
OUTPUT AND ADJ VOLTAGE (V)
3007 F11
Figure 11. Reverse-Output Current
3007fa
15
For more information www.linear.com/LT3007
LT3007 Series
APPLICATIONS INFORMATION
If the LT3007 IN pin is forced below the OUT pin or the
OUT pin is pulled above the IN pin, input current typically
drops to less than 1µA. This occurs if the LT3007 input is
connected to a discharged (low voltage) battery and either
a backup battery or a second regulator circuit holds up
the output. The state of the SHDN pin has no effect in the
reverse current if OUT is pulled above IN.
Fault Tolerance
The LT3007 regulators tolerate single fault conditions.
Shorting two adjacent pins together or leaving one single
pin floating does not increase V
value or cause damage to the LT3007 regulators. How-
ever, the application circuit must meet the requirements
discussed in this section to achieve this tolerance level.
Tables 4 and 5 show the effects that result from shorting
adjacent pins or from a floating pin, respectively.
above its regulated
OUT
Table 4: Effects of Pin-to-Pin Shorts
PIN
NUMBERS PIN NAMES EFFECT
COMMENT
1-2
2-3
3-4
5-6
6-7
7-8
SHDN-GND LT3007 is in Micropower Shutdown, V
is Off
OUT
GND-GND No Effect. Pins 2, 3 and 4 are Normally Tied to GND
GND-GND No Effect. Pins 2, 3 and 4 are Normally Tied to GND
IN-NC
NC-OUT
OUT-ADJ
No Effect as Long as NC is Floating
No Effect as Long as NC is Floating
V
OUT
V
OUT
Decreases to 600mV as the Top Resistor in the
Divider is Shorted
LT3007 Adjustable Version
7-8
OUT-SENSE No Effect as These Two Pins are Normally Shorted Together
LT3007 Fixed Voltage version.
Table 5: Effects of Floating Pins
PIN
NUMBER PIN NAME EFFECT
COMMENT
1
2
3
4
5
6
7
8
8
SHDN
GND
GND
GND
IN
LT3007 is in Micropower Shutdown, V
is Off
OUT
No Effect as Long as Pins 3 or 4 are Tied to GND
No Effect as Long as Pins 2 or 4 are Tied to GND
No Effect as Long as Pins 2 or 3 are Tied to GND
LT3007 Has No Input Power, V
No Effect
is Off
OUT
NC
OUT
ADJ
V
OUT
V
OUT
V
OUT
Internal to LT3007 is @ V . V
Externally Decreases to 0V
IN OUT
Decreases to Less Than Regulated V
LT3007 Adjustable Version
OUT
SENSE
Increases to @ V Unless an External Clamp is Added
LT3007 Fixed Voltage version.
IN
3007fa
16
For more information www.linear.com/LT3007
LT3007 Series
TYPICAL APPLICATIONS
Keep-Alive Power Supply
NO PROTECTION
DIODES NEEDED!
3.3V
V
IN
12V
IN
OUT
LT3007-3.3
1µF
2.2µF
LOAD:
SHDN SENSE
SYSTEM MONITOR,
VOLATILE MEMORY, ETC.
GND
3007 TA02
Last-Gasp Circuit
LINE POWER
V
LINE
12V TO 15V
SENSE
D
CHARGE
LINE
INTERRUPT
DETECT
R
LIMIT
TO
5V
PWR
FAULT
MONITORING
CENTER
IN
OUT
GND
SUPERCAP
1µF
2.2µF
LT3007-5
3007 TA03
SHDN SENSE
GND
3007fa
17
For more information www.linear.com/LT3007
LT3007 Series
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
TS8 Package
8-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1637 Rev A)
2.90 BSC
(NOTE 4)
0.40
MAX
0.65
REF
1.22 REF
1.4 MIN
1.50 – 1.75
(NOTE 4)
2.80 BSC
3.85 MAX 2.62 REF
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.22 – 0.36
8 PLCS (NOTE 3)
0.65 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.95 BSC
TS8 TSOT-23 0710 REV A
0.09 – 0.20
(NOTE 3)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
3007fa
18
For more information www.linear.com/LT3007
LT3007 Series
REVISION HISTORY
REV
DATE
11/14 Added H-grade
Modified Conditions for Current Limit graph
DESCRIPTION
PAGE NUMBER
A
2 to 5
7
Updated Load Regulation graph
8
Modified High Temperature section in Applications Information
Added Feedforward Capacitance section
10
12
14
Added High Temperature Operation section
3007fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
19
LT3007 Series
TYPICAL APPLICATION
Average Power Savings for Low Duty Cycle Applications
0mA to 10mA Pulsed Load, IN = 12V
Low Duty Cycle Applications
100
90
80
70
60
3.3V
V
IN
IN
OUT
LT3007-3.3
12V
1µF
2.2µF
LOW DUTY CYCLE
PULSED LOAD
0mA TO 10mA
SHDN SENSE
100µA I
GND
Q
50
40
30
20
10
0
30µA I
Q
3007 TA04a
10µA I
Q
1
10
0.1
DUTY CYCLE (%)
3007 TA04b
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1761
100mA, Low Noise Micropower LDO V : 1.8V to 20V, V
= 1.22V, V = 0.3V, I = 20µA, I < 1µA, Low Noise: < 20µV
,
IN
OUT
DO
Q
SD
RMS
Stable with 1µF Ceramic Capacitors, ThinSOTTM Package
LT1762
LT1763
150mA, Low Noise Micropower LDO V : 1.8V to 20V, V
= 1.22V, V = 0.3V, I = 25µA, I < 1µA, Low Noise: < 20µV
,
IN
OUT
OUT
OUT
DO
Q
SD
RMS
MS8 Package
500mA, Low Noise Micropower LDO V : 1.8V to 20V, V
= 1.22V, V = 0.3V, I = 30µA, I < 1µA, Low Noise: < 20µV
,
IN
DO
Q
SD
RMS
S8 Package
LT1764/LT1764A 3A, Low Noise, Fast Transient
Response LDOs
V : 2.7V to 20V, V
= 1.21V, V = 0.34V, I = 1mA, I < 1µA, Low Noise: < 40µV
,
IN
DO
Q
SD
RMS
LT1764A Version Stable with Ceramic Capacitors, DD and TO220-5 Packages
LT1962
300mA, Low Noise Micropower LDO V : 1.8V to 20V, V
= 1.22V, V = 0.27V, I = 30µA, I < 1µA,
OUT(MIN) DO Q SD
RMS
IN
Low Noise: < 20µV
, MS8 Package
LT1963/LT1963A 1.5A, Low Noise, Fast Transient
Response LDOs
V : 2.1V to 20V, V
= 1.21V, V = 0.34V, I = 1mA, I < 1µA,
OUT(MIN) DO Q SD
RMS
IN
Low Noise: < 40µV
, LT1963A Version Stable with Ceramic Capacitors, DD, TO220-5,
SOT223 and S8 Packages
LT3008
20mA, 45V, 3µA I Micropower LDO 300mV Dropout Voltage, Low I : 3µA, V : 2V to 45V, V : 0.6V to 39.5V, ThinSOT and
Q Q IN OUT
2mm × 3mm DFN-6 Packages
LT3009
LT3020
20mA, 3µA I Micropower LDO
V : 1.6V to 20V, Low I : 3µA, V = 0.28V, 2mm × 2mm DFN and SC70-8 Packages
Q
IN
Q
DO
100mA, Low Voltage VLDO
V : 0.9V to 10V, V
= 0.20V, V = 0.15V, I = 120µA, I < 1µA, 3mm × 3mm DFN
OUT(MIN) DO Q SD
IN
and MS8 Packages
LT3021
500mA, Low Voltage VLDO
V : 0.9V to 10V, V
= 0.20V, V = 0.16V, I = 120µA, I < 3µA, 5mm × 5mm DFN
OUT(MIN) DO Q SD
IN
and SO8 Packages
LT3080/LT3080-1 1.1A, Parallelable, Low Noise,
Low Dropout Linear Regulator
300mV Dropout Voltage (2-Supply Operation), Low Noise: 40µV
, V : 1.2V to 36V,
RMS IN
V
: 0V to 35.7V, Current-Based Reference with 1-Resistor V
Set; Directly Parallelable
OUT
OUT
(No Op Amp Required), Stable with Ceramic Caps, TO-220, SOT-223, MSOP and 3mm ×
3mm DFN Packages; LT3080-1 Version Has Integrated Internal Ballast Resistor
LT3085
500mA, Parallelable, Low Noise,
Low Dropout Linear Regulator
275mV Dropout Voltage (2-Supply Operation), Low Noise: 40µV
OUT
(No Op Amp Required), Stable with Ceramic Caps, MSOP-8 and 2mm × 3mm DFN Packages
, V : 1.2V to 36V,
RMS IN
V
: 0V to 35.7V, Current-Based Reference with 1-Resistor V
Set; Directly Parallelable
OUT
3007fa
LT 1114 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
20
●
●
LINEAR TECHNOLOGY CORPORATION 2013
(408)432-1900 FAX: (408) 434-0507 www.linear.com/LT3007
相关型号:
SI9130DB
5- and 3.3-V Step-Down Synchronous ConvertersWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1-E3
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135_11
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9136_11
Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130CG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130LG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130_11
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137LG
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
©2020 ICPDF网 联系我们和版权申明