LINEAR TECHNOLOGY LT3012B Technical data
FEATURES
■
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
■
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
U
APPLICATIO S
■
Low Current High Voltage Regulators
■
Regulator for Battery-Powered Systems
■
Telecom Applications
■
Automotive Applications
LT3012B
250mA, 4V to 80V
Low Dropout
Micropower Linear Regulator
U
DESCRIPTIO
The LT®3012B 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) makes
the LT3012B an ideal choice. Quiescent current is also well
controlled in dropout.
Other features of the LT3012B include the ability to operate with very small output capacitors. The regulators are
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 LT3012B 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
5V Supply
IN
V
IN
5.4V TO
80V
1µF
OUT
LT3012B
ADJ
GND
U
750k
249k
3012B TA01
V
5V
250mA
3.3µF
OUT
Dropout Voltage
400
350
300
250
200
150
100
DROPOUT VOLTAGE (mV)
50
0
50 100 150 250
0
OUTPUT CURRENT (mA)
200
3012B TA02
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1
LT3012B
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
17
GND
NC
OUT
OUT
ADJ
GND
NC
GND
GND
NC
IN
IN
NC
NC
NC
GND
WWWU
ABSOLUTE AXI U RATI GS
(Note 1)
IN Pin Voltage ................................................... ±80V
OUT Pin Voltage ............................................... ±60V
IN to OUT Differential Voltage ........................... ± 80V
ADJ Pin Voltage .................................................. ±7V
Output Short-Circuit Duration ..................... Indefinite
UU
W
PACKAGE/ORDER I FOR ATIO
TOP VIEW
1
NC
2
OUT
3
OUT
4
ADJ
5
GND
6
NC
12-LEAD (4mm × 3mm) PLASTIC DFN
T
JMAX
DE PACKAGE
= 125°C, θJA = 40°C/ W, θJC = 16°C/ W
EXPOSED PAD (PIN 13) IS GND
MUST BE SOLDERED TO PCB
12
NC
11
IN
10
13
IN
9
NC
8
NC
7
NC
Storage Temperature Range
TSSOP Package ........................... –65°C to 150°C
DFN Package ............................... –65°C to 125°C
Operating Junction Temperature Range
(Notes 3, 9, 10) ........................... –40°C to 125°C
Lead Temperature (Soldering, 10 sec)............ 300°C
T
= 125°C, θJA = 40°C/ W, θJC = 16°C/ W
JMAX
EXPOSED PAD (PIN 17) IS GND
MUST BE SOLDERED TO PCB
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.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage I
ADJ Pin Voltage (Notes 2, 3) V
Line Regulation ∆V
Load Regulation (Note 2) V
2
ORDER PART NUMBER
LT3012BEDE 3012B
DE PART MARKING
= 250mA
LOAD
= 4V, I
IN
4.5V < V
= 4V to 80V, I
IN
= 4.5V, ∆I
IN
V
= 4.5V, ∆I
IN
= 1mA 1.225 1.24 1.255 V
LOAD
< 80V, 1mA < I
IN
LOAD
= 1mA to 250mA 7 12 mV
LOAD
= 1mA to 250mA
LOAD
< 250mA
LOAD
= 1mA (Note 2)
ORDER PART NUMBER FE PART MARKING
LT3012BEFE 3012BEFE
●
●
1.2 1.24 1.28 V
●
●
4 4.5 V
0.1 5 mV
25 mV
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LT3012B
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Dropout Voltage I
= V
V
IN
OUT(NOMINAL)
(Notes 4, 5) I
GND Pin Current I
V
= 4.5V I
IN
(Notes 4, 6) I
Output Voltage Noise C
ADJ Pin Bias Current (Note 7) 30 100 nA
Ripple Rejection V
Current Limit V
Reverse Output Current (Note 8) V
= 10mA 160 230 mV
LOAD
I
= 10mA
LOAD
= 50mA 250 340 mV
LOAD
= 50mA
I
LOAD
I
= 250mA 400 490 mV
LOAD
= 250mA
I
LOAD
= 0mA
LOAD
= 100mA 3 mA
LOAD
= 250mA
LOAD
= 10µF, I
OUT
= 7V(Avg), V
IN
= 7V, V
IN
= 4.5V, ∆V
V
IN
= 1.24V, V
OUT
= 250mA, BW = 10Hz to 100kHz 100 µV
LOAD
= 0.5V
RIPPLE
= 0V 400 mA
OUT
= –0.1V (Note 2) ● 270 mA
OUT
< 1.24V (Note 2) 12 25 µA
IN
P-P
, f
RIPPLE
= 120Hz, I
= 250mA 65 75 dB
LOAD
●
●
●
●
●
40 100 µA
10 18 mA
300 mV
420 mV
620 mV
RMS
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 LT3012B 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 LT3012B
is tested and specified for these conditions with an external resistor divider
(249k bottom, 549k top) for an output voltage of 4V. 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
= 4.5V and a current source
IN
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: 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 9: The LT3012BE 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.
Note 10: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is
active. Continuous operation above the specified maximum operating
junction temperature may impair device reliability.
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LT3012B
UW
TYPICAL PERFOR A CE CHARACTERISTICS
Typical Dropout Voltage Guaranteed Dropout Voltage Dropout Voltage
600
500
400
300
200
DROPOUT VOLTAGE (mV)
100
0
0
OUTPUT CURRENT (mA)
10050
TJ = 125°C
TJ = 25°C
200150
250
3012B G01
600
= TEST POINTS
500
400
300
200
100
GUARANTEED DROPOUT VOLTAGE (mV)
0
OUTPUT CURRENT (mA)
TJ ≤ 125°C
TJ ≤ 25°C
100 200
250500 150
301B2 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
–25 0 50
–50
25
TEMPERATURE (°C)
75 100 125
3012B 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
–25 0 50
–50
25
TEMPERATURE (°C)
75 100 125
3012B G05
600
500
400
300
200
DROPOUT VOLTAGE (mV)
100
0
–50
–25
80
TJ = 25°C
=
R
L
70
V
OUT
60
50
40
30
20
QUIESCENT CURRENT (µA)
10
0
0
IL = 250mA
0
TEMPERATURE (°C)
∞
= 1.24V
21
INPUT VOLTAGE (V)
25
43
5
IL = 100mA
IL = 50mA
IL = 10mA
IL = 1mA
50
75
100
67 9
8
125
3012B G03
10
3012B G06
GND Pin Current
1.2
1.0
0.8
0.6
0.4
GND PIN CURRENT (mA)
0.2
0
21
0
4
TJ = 25°C
*FOR V
RL = 49.6Ω
= 25mA*
I
L
RL = 1.24k
= 1mA*
I
L
67 9
43
5
INPUT VOLTAGE (V)
= 1.24V
OUT
RL = 124Ω
= 10mA*
I
L
8
3012B G07
GND Pin Current GND Pin Current vs I
10
TJ = 25°C, *FOR V
9
8
7
6
5
4
3
GND PIN CURRENT (mA)
2
1
10
0
21
0
= 1.24V
OUT
RL = 4.96Ω
I
L
RL = 12.4Ω
I
L
RL = 24.8Ω, IL = 50mA*
67 9
43
5
INPUT VOLTAGE (V)
= 250mA*
= 100mA*
8
10
3012B G08
10
VIN = 4.5V
9
= 25°C
T
J
= 1.24V
V
OUT
8
7
6
5
4
3
GND PIN CURRENT (mA)
2
1
0
0
LOAD CURRENT (mA)
10050
LOAD
250
200150
3012B G09
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TEMPERATURE (°C)
–50
0
CURRENT LIMIT (mA)
0
50
75
3012B G15
–25
25
100
125
VIN = 7V
V
OUT
= 0V
600
400
200
500
700
300
100
TEMPERATURE (°C)
–50
60
RIPPLE REJECTION (dB)
68
92
80
84
88
0
50
75
3012B G18
64
76
72
–25
25
100
125
VIN = 4.5V + 0.5V
P-P
RIPPLE AT f = 120Hz
I
L
= 250mA
V
OUT
= 1.24V
UW
TYPICAL PERFOR A CE CHARACTERISTICS
LT3012B
ADJ Pin Bias Current
50
45
40
35
30
25
20
15
ADJ PIN BIAS CURRENT (nA)
10
5
0
–25 0 50
–50
25
TEMPERATURE (°C)
Reverse Output Current
200
TJ = 25°C
= 0V
V
180
IN
= V
V
OUT
160
140
120
100
80
60
40
REVERSE OUTPUT CURRENT (µA)
20
0
ADJ
CURRENT FLOWS
INTO OUTPUT PIN
21
0
OUTPUT VOLTAGE (V)
43
75 100 125
ADJ
PIN CLAMP
(SEE APPLICATIONS
INFORMATION)
67 9
5
8
3012B G13
3012B G16
Current Limit
1000
V
= 0V
OUT
900
800
700
600
500
400
300
CURRENT LIMIT (mA)
200
100
0
TJ = 125°C
0
2010
TJ = 25°C
4030
50
INPUT VOLTAGE (V)
60 70
80
3012B G14
Current Limit
Input Ripple RejectionReverse Output Current
35
VIN = 0V
= V
V
OUT
30
25
20
15
10
REVERSE OUTPUT CURRENT (µA)
5
0
10
–50
= 1.24V
ADJ
–25 0 50
25
TEMPERATURE (°C)
75 100 125
3012B G17
100
RIPPLE REJECTION (dB)
Input Ripple Rejection
VIN = 4.5V + 50mV
90
= 250mA
I
LOAD
80
70
60
50
40
30
20
10
0
10
100 1k 10k 100k 1M
RMS
FREQUENCY (Hz)
RIPPLE
C
C
OUT
= 10µF
OUT
= 3.3µF
3012B G19
Minimum Input Voltage
4.0
I
= 250mA
LOAD
3.5
3.0
2.5
2.0
1.5
1.0
MINIMUM INPUT VOLTAGE (V)
0.5
0
–25 0 50
–50
25
TEMPERATURE (°C)
75 100 125
3012B G20
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