LT3012
250mA, 4V to 80V
Low Dropout
Micropower Linear Regulator
FEATURES
n
Wide Input Voltage Range: 4V to 80V
n
Low Quiescent Current: 40μA
n
Low Dropout Voltage: 400mV
n
Output Current: 250mA
n
No Protection Diodes Needed
n
Adjustable Output from 1.24V to 60V
n
1μA Quiescent Current in Shutdown
n
Stable with 3.3μF Output Capacitor
n
Stable with Aluminum, Tantalum or Ceramic
Capacitors
n
Reverse-Battery Protection
n
No Reverse Current Flow from Output to Input
n
Thermal Limiting
n
Thermally Enhanced 16-Lead TSSOP and
12-Pin (4mm × 3mm) DFN Packages
APPLICATIONS
n
Low Current High Voltage Regulators
n
Regulator for Battery-Powered Systems
n
Telecom Applications
n
Automotive Applications
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 ceramic 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 profi le (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.
TYPICAL APPLICATION
5V Supply with Shutdown
IN
SHDN
OUT
LT3012
ADJ
GND
V
IN
5.4V TO
80V
V
SHDN
<0.3V
>2.0V
1μF
OUTPUT
OFF
ON
750k
249k
3012 TA01
V
5V
250mA
3.3μF
OUT
400
350
300
250
200
150
100
DROPOUT VOLTAGE (mV)
50
0
0
Dropout Voltage
50 100 150 250
OUTPUT CURRENT (mA)
200
3012 TA02
3012fd
1
LT3012
ABSOLUTE MAXIMUM RATINGS
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 .......................... Indefi nite
PIN CONFIGURATION
TOP VIEW
1
NC
2
OUT
3
OUT
4
ADJ
5
GND
6
NC
12-LEAD (4mm × 3mm) PLASTIC DFN
T
JMAX
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
DE PACKAGE
= 125°C, θJA = 40°C/W, θJC = 16°C/W
12
NC
11
IN
10
13
IN
9
NC
8
SHDN
7
NC
(Note 1)
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
TOP VIEW
1
GND
2
NC
3
OUT
4
OUT
ADJ
GND
NC
GND
16-LEAD PLASTIC TSSOP
T
= 140°C, θJA = 40°C/W, θJC = 16°C/W
JMAX
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
5
6
7
8
FE PACKAGE
17
GND
16
NC
15
IN
14
IN
13
NC
12
SHDN
11
NC
10
GND
9
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3012EDE#PBF LT3012EDE#TRPBF 3012 12-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C
LT3012EFE#PBF LT3012EFE#TRPBF 3012EFE 16-Lead Plastic TSSOP –40°C to 125°C
LT3012HFE#PBF LT3012HFE#TRPBF 3012HFE 16-Lead Plastic TSSOP –40°C to 140°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3012EDE LT3012EDE#TR 3012 12-Lead (4mm × 3mm) Plastic DFN –40°C to 125°C
LT3012EFE LT3012EFE#TR 3012EFE 16-Lead Plastic TSSOP –40°C to 125°C
LT3012HFE LT3012HFE#TR 3012HFE 16-Lead Plastic TSSOP –40°C to 140°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
For more information on lead free part marking, go to:
For more information on tape and reel specifi cations, go to:
http://www.linear.com/leadfree/
http://www.linear.com/tapeandreel/
3012fd
2
LT3012
ELECTRICAL CHARACTERISTICS
The l
denotes the specifi cations which apply over the –40°C to 125°C operating temperature range, otherwise specifi cations are at TJ = 25°C.
(LT3012E)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage I
ADJ Pin Voltage (Notes 2, 3) V
= 250mA
LOAD
= 4V, I
IN
4.75V < V
= 1mA
LOAD
< 80V, 1mA < I
IN
Line Regulation ΔVIN = 4V to 80V, I
Load Regulation (Note 2) V
Dropout Voltage
V
= V
IN
OUT(NOMINAL)
(Notes 4, 5)
GND Pin Current
V
= 4.75V (Notes 4, 6)
IN
Output Voltage Noise C
= 4.75V, ΔI
IN
V
= 4.75V, ΔI
IN
= 10mA
I
LOAD
I
= 10mA
LOAD
I
= 50mA
LOAD
I
= 50mA
LOAD
= 250mA
I
LOAD
I
= 250mA
LOAD
= 0mA
I
LOAD
I
= 100mA
LOAD
I
= 250mA
LOAD
= 10μF, I
OUT
LOAD
LOAD
LOAD
< 250mA
LOAD
= 1mA (Note 2)
LOAD
= 1mA to 250mA
= 1mA to 250mA
= 250mA, BW = 10Hz to 100kHz 100 μV
l
1.225
l
1.2
l
4 4.75 V
1.24
1.24
1.255
1.28
0.1 5 mV
71225mV
l
160 230
l
300
250 340
l
420
400 490
l
l
40
620
100
3
l
10
18
mV
mV
mV
mV
mV
mV
mV
μA
mA
mA
RMS
ADJ Pin Bias Current (Note 7) 30 100 nA
Shutdown Threshold V
SHDN Pin Current (Note 8) V
Quiescent Current in Shutdown V
Ripple Rejection V
Current Limit V
Reverse Output Current (Note 9) V
= Off to On
OUT
V
= On to Off
OUT
= 0V
SHDN
V
= 6V
SHDN
= 6V, V
IN
= 7V(Avg), V
IN
= 7V, V
IN
V
= 4.75V, ΔV
IN
= 1.24V, VIN < 1.24V (Note 2) 12 25 μA
OUT
= 0V 1 5 μA
SHDN
OUT
RIPPLE
= 0V
OUT
= 0.5V
P-P, fRIPPLE
= –0.1V (Note 2)
= 120Hz, I
= 250mA 65 75 dB
LOAD
l
l
0.3
1.3
0.8
0.3
0.1
2V
2
1
μA
μA
400 mA
l
250
mA
V
V
V
ELECTRICAL CHARACTERISTICS
The l
denotes the specifi cations which apply over the –40°C to 140°C operating temperature range, otherwise specifi cations are at TJ = 25°C.
(LT3012H)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage I
ADJ Pin Voltage (Notes 2, 3) V
= 200mA
LOAD
= 4V, I
IN
4.75V < V
= 1mA
LOAD
< 80V, 1mA < I
IN
Line Regulation ΔVIN = 4V to 80V, I
Load Regulation (Note 2) V
Dropout Voltage
VIN = V
OUT(NOMINAL)
(Notes 4, 5)
GND Pin Current
V
= 4.75V (Notes 4, 6)
IN
= 4.75V, ΔI
IN
V
= 4.75V, ΔI
IN
= 10mA
I
LOAD
I
= 10mA
LOAD
I
= 50mA
LOAD
I
= 50mA
LOAD
I
= 200mA
LOAD
I
= 200mA
LOAD
= 0mA
I
LOAD
I
= 100mA
LOAD
I
= 200mA
LOAD
LOAD
LOAD
< 200mA
LOAD
= 1mA (Note 2)
LOAD
= 1mA to 200mA
= 1mA to 200mA
l
1.225
l
1.2
l
4 4.75 V
1.24
1.24
1.255
1.28
0.1 5 mV
61230mV
l
160 230
l
320
250 340
l
450
360 490
l
l
40
630
110
3
l
7
18
mV
mV
mV
mV
mV
mV
mV
μA
mA
mA
3012fd
3
V
V
LT3012
ELECTRICAL CHARACTERISTICS
The l
denotes the specifi cations which apply over the –40°C to 140°C operating temperature range, otherwise specifi cations are at TJ = 25°C.
(LT3012H)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage Noise C
= 10μF, I
OUT
= 200mA, BW = 10Hz to 100kHz 100 μV
LOAD
RMS
ADJ Pin Bias Current (Note 7) 30 100 nA
Shutdown Threshold V
SHDN Pin Current (Note 8) V
Quiescent Current in Shutdown V
Ripple Rejection V
Current Limit V
Reverse Output Current (Note 9) V
= Off to On
OUT
V
= On to Off
OUT
= 0V
SHDN
V
= 6V
SHDN
= 6V, V
IN
= 7V(Avg), V
IN
= 7V, V
IN
V
= 4.75V, ΔV
IN
= 1.24V, VIN < 1.24V (Note 2) 12 25 μA
OUT
= 0V 1 5 μA
SHDN
OUT
RIPPLE
= 0V
OUT
= 0.5V
= –0.1V (Note 2)
P-P
, f
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 specifi ed 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 specifi cation 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 specifi ed 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 specifi ed output current. In dropout, the
output voltage will be equal to (V
IN
– V
DROPOUT
).
RIPPLE
= 120Hz, I
= 200mA 65 75 dB
LOAD
Note 6: GND pin current is tested with V
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 fl ows into the ADJ pin.
Note 8: SHDN pin current fl ows 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 fl ows into the OUT
pin and out the GND pin.
Note 10: The LT3012E is guaranteed to meet performance specifi cations
from 0°C to 125°C operating junction temperature. Specifi cations 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
l
l
0.3
1.3
0.8
0.3
0.1
400 mA
l
200
= 4.75V and a current source
IN
2V
2
1
μA
μA
mA
temperature will exceed 125°C (LT3012E) or 140°C (LT3012H) when
overtemperature protection is active. Continuous operation above the
specifi ed maximum operating junction temperature may impair device
reliability.
V
4
3012fd
TYPICAL PERFORMANCE CHARACTERISTICS
Typical Dropout Voltage Guaranteed Dropout Voltage Dropout Voltage
600
500
400
300
200
DROPOUT VOLTAGE (mV)
100
0
0
TJ = 125°C
TJ = 25°C
10050
OUTPUT CURRENT (mA)
250
200150
3012 G01
600
500
400
300
200
100
GUARANTEED DROPOUT VOLTAGE (mV)
0
= TEST POINTS
OUTPUT CURRENT (mA)
TJ ≤ 125°C
TJ ≤ 25°C
100 200
250500 150
3012 G02
Quiescent Current ADJ Pin Voltage Quiescent Current
100
VIN = 6V
90
= ∞
R
L
= 0
I
L
80
70
60
50
40
30
QUIESCENT CURRENT (μA)
20
10
0
–50 0
–25
V
SHDN
V
SHDN
25
TEMPERATURE (°C)
= V
= GND
50
IN
75
100
150125
3012 G04
1.260
IL = 1mA
1.255
1.250
1.245
1.240
1.235
ADJ PIN VOLTAGE (V)
1.230
1.225
1.220
–50 0
–25
50
25
TEMPERATURE (°C)
75
100
150125
3012 G05
600
500
400
300
200
DROPOUT VOLTAGE (mV)
100
0
–50
80
TJ = 25°C
R
70
V
60
50
40
30
20
QUIESCENT CURRENT (μA)
10
0
0
L
OUT
= ∞
–25
= 1.24V
0
21
LT3012
IL = 250mA
IL = 100mA
IL = 10mA
IL = 1mA
50
25
TEMPERATURE (°C)
INPUT VOLTAGE (V)
V
43
SHDN
5
75
V
SHDN
= GND
67 9
IL = 50mA
100
= V
8
150125
3012 G03
IN
10
3012 G06
Quiescent Current GND Pin Current GND Pin Current
250
TJ = 25°C
=
R
225
200
175
150
125
100
QUIESCENT CURRENT(μA)
∞
L
V
= 1.24V
OUT
V
75
50
25
0
0
2010
INPUT VOLTAGE (V)
SHDN
= V
4030
IN
V
= GND
SHDN
60 70
50
80
3012 G07
1.2
1.0
0.8
0.6
0.4
GND PIN CURRENT (mA)
0.2
0
0
RL = 49.6Ω
I
21
INPUT VOLTAGE (V)
= 25mA*
L
RL = 1.24k
I
43
TJ = 25°C
*FOR V
= 1mA*
L
67 9
5
= 1.24V
OUT
RL = 124Ω
= 10mA*
I
L
8
3012 G08
10
TJ = 25°C, *FOR V
9
8
7
6
5
4
3
GND PIN CURRENT (mA)
2
1
0
10
0
OUT
RL = 24.8Ω, IL = 50mA*
21
43
INPUT VOLTAGE (V)
= 1.24V
RL = 4.96Ω
= 250mA*
I
L
RL = 12.4Ω
= 100mA*
I
L
67 9
5
8
10
3012 G09
3012fd
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