FEATURES
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LT3012
250mA, 4V to 80V
Low Dropout
Micropower Linear Regulator
DESCRIPTION
The LT
®
3012 is a high voltage, micropower low dropout
linear regulator. The device is capable of supplying 250mA of
output current with a dropout voltage of 400mV. Designed
for use in battery-powered or high voltage systems, the low
quiescent current (40μA operating and 1μA in shutdown)
makes the LT3012 an ideal choice. Quiescent current is
also well controlled in dropout.
Other features of the LT3012 include the ability to operate
with very small output capacitors. The regulator is stable
with only 3.3μF on the output while most older devices
require between 10μF and 100μF for stability. Small ce-
ramic capacitors can be used without any need for series
resistance (ESR) as is common with other regulators.
Internal protection circuitry includes reverse-battery
protection, current limiting, thermal limiting and reverse
current protection.
The device is available with an adjustable output with a
1.24V reference voltage. The LT3012 regulator is available
in the 16-lead TSSOP and 12 pin low profile (0.75mm)
(4mm
×
3mm) DFN packages with an exposed pad for
enhanced thermal handling capability.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Wide Input Voltage Range: 4V to 80V
Low Quiescent Current: 40μA
Low Dropout Voltage: 400mV
Output Current: 250mA
No Protection Diodes Needed
Adjustable Output from 1.24V to 60V
1μA Quiescent Current in Shutdown
Stable with 3.3μF Output Capacitor
Stable with Aluminum, Tantalum or Ceramic
Capacitors
Reverse-Battery Protection
No Reverse Current Flow from Output to Input
Thermal Limiting
Thermally Enhanced 16-Lead TSSOP and
12-Pin (4mm
×
3mm) DFN Packages
APPLICATIONS
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Low Current High Voltage Regulators
Regulator for Battery-Powered Systems
Telecom Applications
Automotive Applications
TYPICAL APPLICATION
5V Supply with Shutdown
400
IN
V
IN
5.4V TO
80V
1μF
OUT
LT3012
SHDN
GND
ADJ
249k
3012 TA01
Dropout Voltage
V
OUT
5V
250mA
3.3μF
350
DROPOUT VOLTAGE (mV)
300
250
200
150
100
50
0
0
50
200
OUTPUT CURRENT (mA)
100
150
250
3012 TA02
750k
V
SHDN
<0.3V
>2.0V
OUTPUT
OFF
ON
3012fd
1
LT3012
ABSOLUTE MAXIMUM RATINGS
(Note 1)
IN Pin Voltage .........................................................±80V
OUT Pin Voltage ......................................................±60V
IN to OUT Differential Voltage .................................±80V
ADJ Pin Voltage ........................................................±7V
SHDN
Pin Input Voltage ..........................................±80V
Output Short-Circuit Duration .......................... Indefinite
Storage Temperature Range
TSSOP Package ................................. –65°C to 150°C
DFN Package...................................... –65°C to 125°C
Operating Junction Temperature Range
(Notes 3, 10, 11)
LT3012E ............................................. –40°C to 125°C
LT3012HFE......................................... –40°C to 140°C
Lead Temperature (FE16 Soldering, 10 sec) ......... 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
GND
NC
OUT
OUT
ADJ
GND
NC
1
2
3
4
5
6
13
12 NC
11 IN
10 IN
9
8
7
NC
SHDN
NC
NC
OUT
OUT
ADJ
GND
NC
GND
DE PACKAGE
12-LEAD (4mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 40°C/W,
θ
JC
= 16°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
17
16 GND
15 NC
14 IN
13 IN
12 NC
11
SHDN
10 NC
9
GND
FE PACKAGE
16-LEAD PLASTIC TSSOP
T
JMAX
= 140°C,
θ
JA
= 40°C/W,
θ
JC
= 16°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3012EDE#PBF
LT3012EFE#PBF
LT3012HFE#PBF
LEAD BASED FINISH
LT3012EDE
LT3012EFE
LT3012HFE
TAPE AND REEL
LT3012EDE#TRPBF
LT3012EFE#TRPBF
LT3012HFE#TRPBF
TAPE AND REEL
LT3012EDE#TR
LT3012EFE#TR
LT3012HFE#TR
PART MARKING
3012
3012EFE
3012HFE
PART MARKING
3012
3012EFE
3012HFE
PACKAGE DESCRIPTION
12-Lead (4mm
×
3mm) Plastic DFN
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
PACKAGE DESCRIPTION
12-Lead (4mm
×
3mm) Plastic DFN
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 140°C
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 140°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
3012fd
2
LT3012
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage
ADJ Pin Voltage (Notes 2, 3)
Line Regulation
Load Regulation (Note 2)
Dropout Voltage
V
IN
= V
OUT(NOMINAL)
(Notes 4, 5)
CONDITIONS
I
LOAD
= 250mA
V
IN
= 4V, I
LOAD
= 1mA
4.75V < V
IN
< 80V, 1mA < I
LOAD
< 250mA
ΔV
IN
= 4V to 80V, I
LOAD
= 1mA (Note 2)
V
IN
= 4.75V,
ΔI
LOAD
= 1mA to 250mA
V
IN
= 4.75V,
ΔI
LOAD
= 1mA to 250mA
I
LOAD
= 10mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 50mA
I
LOAD
= 250mA
I
LOAD
= 250mA
GND Pin Current
V
IN
= 4.75V (Notes 4, 6)
Output Voltage Noise
ADJ Pin Bias Current
Shutdown Threshold
SHDN
Pin Current (Note 8)
Quiescent Current in Shutdown
Ripple Rejection
Current Limit
Reverse Output Current (Note 9)
I
LOAD
= 0mA
I
LOAD
= 100mA
I
LOAD
= 250mA
C
OUT
= 10μF I
LOAD
= 250mA, BW = 10Hz to 100kHz
,
(Note 7)
V
OUT
= Off to On
V
OUT
= On to Off
V
SHDN
= 0V
V
SHDN
= 6V
V
IN
= 6V, V
SHDN
= 0V
V
IN
= 7V(Avg), V
RIPPLE
= 0.5V
P-P,
f
RIPPLE
= 120Hz, I
LOAD
= 250mA
V
IN
= 7V, V
OUT
= 0V
V
IN
= 4.75V,
ΔV
OUT
= –0.1V (Note 2)
V
OUT
= 1.24V, V
IN
< 1.24V (Note 2)
l
l
l
l
l
l
l
l
l
l
l
l
(LT3012E)
The
l
denotes the specifications which apply over the –40°C to 125°C operating temperature range, otherwise specifications are at T
J
= 25°C.
MIN
1.225
1.2
TYP
4
1.24
1.24
0.1
7
160
250
400
40
3
10
100
30
0.3
1.3
0.8
0.3
0.1
1
65
250
12
25
75
400
100
2
2
1
5
MAX
4.75
1.255
1.28
5
12
25
230
300
340
420
490
620
100
18
UNITS
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
μA
mA
mA
μV
RMS
nA
V
V
μA
μA
μA
dB
mA
mA
μA
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage
ADJ Pin Voltage (Notes 2, 3)
Line Regulation
Load Regulation (Note 2)
Dropout Voltage
V
IN
= V
OUT(NOMINAL)
(Notes 4, 5)
CONDITIONS
I
LOAD
= 200mA
(LT3012H)
The
l
denotes the specifications which apply over the –40°C to 140°C operating temperature range, otherwise specifications are at T
J
= 25°C.
MIN
l
l
l
l
l
l
l
l
l
TYP
4
1.24
1.24
0.1
6
160
250
360
40
3
7
MAX
4.75
1.255
1.28
5
12
30
230
320
340
450
490
630
110
18
UNITS
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
μA
mA
mA
3012fd
V
IN
= 4V, I
LOAD
= 1mA
4.75V < V
IN
< 80V, 1mA < I
LOAD
< 200mA
ΔV
IN
= 4V to 80V, I
LOAD
= 1mA (Note 2)
V
IN
= 4.75V,
ΔI
LOAD
= 1mA to 200mA
V
IN
= 4.75V,
ΔI
LOAD
= 1mA to 200mA
I
LOAD
= 10mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 50mA
I
LOAD
= 200mA
I
LOAD
= 200mA
1.225
1.2
GND Pin Current
V
IN
= 4.75V (Notes 4, 6)
I
LOAD
= 0mA
I
LOAD
= 100mA
I
LOAD
= 200mA
3
LT3012
ELECTRICAL CHARACTERISTICS
PARAMETER
Output Voltage Noise
ADJ Pin Bias Current
Shutdown Threshold
SHDN
Pin Current (Note 8)
Quiescent Current in Shutdown
Ripple Rejection
Current Limit
Reverse Output Current (Note 9)
CONDITIONS
C
OUT
= 10μF, I
LOAD
= 200mA, BW = 10Hz to 100kHz
(Note 7)
V
OUT
= Off to On
V
OUT
= On to Off
V
SHDN
= 0V
V
SHDN
= 6V
V
IN
= 6V, V
SHDN
= 0V
V
IN
= 7V(Avg), V
RIPPLE
= 0.5V
P-P
, f
RIPPLE
= 120Hz, I
LOAD
= 200mA
V
IN
= 7V, V
OUT
= 0V
V
IN
= 4.75V,
ΔV
OUT
= –0.1V (Note 2)
V
OUT
= 1.24V, V
IN
< 1.24V (Note 2)
l
l
l
(LT3012H)
The
l
denotes the specifications which apply over the –40°C to 140°C operating temperature range, otherwise specifications are at T
J
= 25°C.
MIN
TYP
100
30
0.3
1.3
0.8
0.3
0.1
1
65
200
12
25
75
400
100
2
2
1
5
MAX
UNITS
μV
RMS
nA
V
V
μA
μA
μA
dB
mA
mA
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 LT3012 is tested and specified for these conditions with the
ADJ pin connected to the OUT pin.
Note 3:
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 4:
To satisfy requirements for minimum input voltage, the LT3012
is tested and specified for these conditions with an external resistor
divider (249k bottom, 649k top) for an output voltage of 4.5V. The external
resistor divider will add a 5μA DC load on the output.
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 will be equal to (V
IN
– V
DROPOUT
).
Note 6:
GND pin current is tested with V
IN
= 4.75V and a current source
load. This means the device is tested while operating close to its dropout
region. This is the worst-case GND pin current. The GND pin current will
decrease slightly at higher input voltages.
Note 7:
ADJ pin bias current flows into the ADJ pin.
Note 8:
SHDN
pin current flows out of the
SHDN
pin.
Note 9:
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 10:
The LT3012E is guaranteed to meet performance specifications
from 0°C to 125°C operating junction temperature. Specifications over
the –40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LT3012H is tested to the LT3012H Electrical Characteristics table at
140°C operating junction temperature. High junction temperatures degrade
operating lifetimes. Operating lifetime is derated at junction temperatures
greater than 125°C.
Note 11:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C (LT3012E) or 140°C (LT3012H) when
overtemperature protection is active. Continuous operation above the
specified maximum operating junction temperature may impair device
reliability.
3012fd
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LT3012
TYPICAL PERFORMANCE CHARACTERISTICS
Typical Dropout Voltage
600
GUARANTEED DROPOUT VOLTAGE (mV)
500
DROPOUT VOLTAGE (mV)
400
300
200
100
0
T
J
= 25°C
T
J
= 125°C
600
500
DROPOUT VOLTAGE (mV)
400
300
200
100
0
0
50
100
150
200
OUTPUT CURRENT (mA)
250
3012 G01
Guaranteed Dropout Voltage
= TEST POINTS
600
T
J
≤ 125°C
500
400
300
200
100
Dropout Voltage
I
L
= 250mA
I
L
= 100mA
T
J
≤ 25°C
I
L
= 50mA
I
L
= 10mA
I
L
= 1mA
0
50
150
100
200
OUTPUT CURRENT (mA)
250
3012 G02
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3012 G03
Quiescent Current
100
V
IN
= 6V
90 R
L
= ∞
I =0
80
L
70
60
50
40
30
20
10
0
–50 –25
0
V
SHDN
= GND
25 50 75 100 125 150
TEMPERATURE (°C)
3012 G04
ADJ Pin Voltage
1.260
1.255
ADJ PIN VOLTAGE (V)
1.250
1.245
1.240
1.235
1.230
1.225
1.220
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3012 G05
Quiescent Current
80
70
QUIESCENT CURRENT (μA)
60
50
40
30
20
10
V
SHDN
= GND
0
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
V
SHDN
= V
IN
T
J
= 25°C
R
L
=
∞
V
OUT
= 1.24V
I
L
= 1mA
QUIESCENT CURRENT (μA)
V
SHDN
= V
IN
3012 G06
Quiescent Current
250
T
J
= 25°C
225 R
L
=
∞
V
OUT
= 1.24V
200
GND PIN CURRENT (mA)
175
150
125
100
75
50
25
0
0
10
20
30 40 50 60
INPUT VOLTAGE (V)
70
80
0
V
SHDN
= GND
V
SHDN
= V
IN
1.2
1.0
0.8
0.6
0.4
0.2
GND Pin Current
T
J
= 25°C
*FOR V
OUT
= 1.24V
GND PIN CURRENT (mA)
R
L
= 49.6Ω
I
L
= 25mA*
R
L
= 124Ω
I
L
= 10mA*
10
9
8
7
6
5
4
3
2
1
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
0
GND Pin Current
T
J
= 25°C, *FOR V
OUT
= 1.24V
QUIESCENT CURRENT(μA)
R
L
= 4.96Ω
I
L
= 250mA*
R
L
= 12.4Ω
I
L
= 100mA*
R
L
= 1.24k
I
L
= 1mA*
R
L
= 24.8Ω, I
L
= 50mA*
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
3012 G07
3012 G08
3012 G09
3012fd
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