LT3010/LT3010-5
50mA, 3V to 80V
Low Dropout
Micropower Linear Regulator
DESCRIPTION
FEATURES
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Wide Input Voltage Range: 3V to 80V
Low Quiescent Current: 30µA
Low Dropout Voltage: 300mV
Output Current: 50mA
Thermally Enhanced 8-Lead MSOP Package
No Protection Diodes Needed
Fixed Output Voltage: 5V (LT3010-5)
Adjustable Output from 1.275V to 60V (LT3010)
1µA Quiescent Current in Shutdown
Stable with 1µF Output Capacitor
Stable with Aluminum, Tantalum or Ceramic
Capacitors
n Reverse-Battery Protection
n No Reverse Current Flow from Output
n Thermal Limiting
The LT®3010 is a high voltage, micropower low dropout
linear regulator. The device is capable of supplying 50mA
output current with a dropout voltage of 300mV. Designed
for use in battery-powered or high voltage systems, the low
quiescent current (30µA operating and 1µA in shutdown)
makes the LT3010 an ideal choice. Quiescent current is
also well controlled in dropout.
APPLICATIONS
The device is available in a fixed output voltage of 5V and
as an adjustable device with a 1.275V reference voltage.
The LT3010 regulator is available in the 8-lead MSOP package with an exposed pad for enhanced thermal handling
capability.
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Low Current High Voltage Regulators
Regulator for Battery-Powered Systems
Telecom Applications
Automotive Applications
Other features of the LT3010 include the ability to operate
with very small output capacitors. The regulators are stable
with only 1µF on the output while most older devices require between 10µF and 100µF for stability. Small ceramic
capacitors can be used without the necessary addition of
ESR as is common with other regulators. Internal protection circuitry includes reverse-battery protection, current
limiting, thermal limiting and reverse current protection.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
TYPICAL APPLICATION
Dropout Voltage
350
5V Supply with Shutdown
VIN
5.4V TO
80V
1µF
OUT
LT3010-5
SHDN SENSE
GND
30105 TA01
VSHDN (PIN 5) OUTPUT
2.0V
ON
VOUT
5V
50mA
1µF
DROPOUT VOLTAGE (mV)
IN
300
250
200
150
100
50
0
0
10
40
20
30
OUTPUT CURRENT (mA)
50
30105 TA02
30105fe
1
LT3010/LT3010-5
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
(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................... –65°C to 150°C
Operating Junction Temperature Range
(Notes 3, 10, 11)
LT3010E.............................................. –40°C to 125°C
LT3010H............................................. –40°C to 140°C
LT3010MP.......................................... –55°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
OUT
SENSE/ADJ*
NC
GND
1
2
3
4
9
GND
8
7
6
5
IN
NC
NC
SHDN
MS8E PACKAGE
8-LEAD PLASTIC MSOP
*SENSE FOR LT3010-5, ADJ FOR LT3010
TJMAX = 125°C (LT3010E/LT3010MP), θJA = 40°C/W, θJC = 16°C/W†
TJMAX = 140°C (LT3010H), θJA = 40°C/W, θJC = 16°C/W†
SEE APPLICATIONS INFORMATION SECTION.
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
†MEASURED AT BOTTOM PAD
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3010EMS8E#PBF
LT3010EMS8E#TRPBF
LTZF
8-Lead Plastic MSOP
–40°C to 125°C
LT3010EMS8E-5#PBF
LT3010EMS8E-5#TRPBF
LTAEF
8-Lead Plastic MSOP
–40°C to 125°C
LT3010HMS8E#PBF
LT3010HMS8E#TRPBF
LTCLP
8-Lead Plastic MSOP
–40°C to 140°C
LT3010HMS8E-5#PBF
LT3010HMS8E-5#TRPBF
LTCLQ
8-Lead Plastic MSOP
–40°C to 140°C
LT3010MPMS8E#PBF
LT3010MPMS8E#TRPBF
LTZF
8-Lead Plastic MSOP
–55°C to 125°C
LT3010MPMS8E-5#PBF
LT3010MPMS8E-5#TRPBF
LTAEF
8-Lead Plastic MSOP
–55°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3010EMS8E
LT3010EMS8E#TR
LTZF
8-Lead Plastic MSOP
–40°C to 125°C
LT3010EMS8E-5
LT3010EMS8E-5#TR
LTAEF
8-Lead Plastic MSOP
–40°C to 125°C
LT3010HMS8E
LT3010HMS8E #TR
LTCLP
8-Lead Plastic MSOP
–40°C to 140°C
LT3010HMS8E-5
LT3010HMS8E-5 #TR
LTCLQ
8-Lead Plastic MSOP
–40°C to 140°C
LT3010MPMS8E
LT3010MPMS8E#TR
LTZF
8-Lead Plastic MSOP
–55°C to 125°C
LT3010MPMS8E-5
LT3010MPMS8E-5#TR
LTAEF
8-Lead Plastic MSOP
–55°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
(LT3010E, LT3010MP) The l denotes the specifications which apply over
the –40°C to 125°C (LT3010E) or –55°C to 125°C (LT3010MP) operating temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage
LT3010 ILOAD = 50mA
l
3
4
V
Regulated Output Voltage
(Note 3)
LT3010-5 VIN = 5.5V, ILOAD = 1mA
6V < VIN < 80V, 1mA < ILOAD < 50mA
4.925
l 4.850
5.000
5.000
5.075
5.150
V
V
ADJ Pin Voltage (Notes 2, 3)
LT3010 VIN = 3V, ILOAD = 1mA
4V < VIN < 80V, 1mA < ILOAD < 50mA
l
1.258
1.237
1.275
1.275
1.292
1.313
V
V
30105fe
2
LT3010/LT3010-5
ELECTRICAL
CHARACTERISTICS
(LT3010E, LT3010MP) The l denotes the specifications which apply over
the –40°C to 125°C (LT3010E) or –55°C to 125°C (LT3010MP) operating temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
Line Regulation
LT3010-5
ΔVIN = 5.5V to 80V, ILOAD = 1mA
LT3010 (Note 2) ΔVIN = 3V to 80V, ILOAD = 1mA
Load Regulation
LT3010-5 VIN = 6V, ΔILOAD = 1mA to 50mA
VIN = 6V, ΔILOAD = 1mA to 50mA
l
LT3010 (Note 2) VIN = 4V, ΔILOAD = 1mA to 50mA
VIN = 4V, ΔILOAD = 1mA to 50mA
l
ILOAD = 1mA
ILOAD = 1mA
l
ILOAD = 10mA
ILOAD = 10mA
l
ILOAD = 50mA
ILOAD = 50mA
l
GND Pin Current
VIN = VOUT(NOMINAL)
(Notes 4, 6)
ILOAD = 0mA
ILOAD = 1mA
ILOAD = 10mA
ILOAD = 50mA
l
l
l
l
Output Voltage Noise
COUT = 10µF, ILOAD = 50mA, BW = 10Hz to 100kHz
100
ADJ Pin Bias Current
(Note 7)
50
100
nA
Shutdown Threshold
VOUT = Off to On
VOUT = On to Off
1.3
1.1
2
V
V
SHDN Pin Current
(Note 8)
VSHDN = 0V
VSHDN = 6V
0.5
0.1
2
0.5
µA
µA
1
5
µA
Dropout Voltage
VIN = VOUT(NOMINAL)
(Notes 4, 5)
MIN
l
l
l
0.3
Quiescent Current in Shutdown VIN = 6V, VSHDN = 0V
Ripple Rejection
LT3010 VIN = 7V(Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 50mA
LT3010-5 VIN = 7V(Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 50mA
Current Limit
VIN = 7V, VOUT = 0V
LT3010-5 VIN = 6V, ΔVOUT = –0.1V
LT3010 (Note 2) VIN = 4V, ΔVOUT = –0.1V
Input Reverse Leakage Current VIN = –80V, VOUT = 0V
LT3010-5 VOUT = 5V, VIN < 5V
Reverse Output Current
LT3010 (Note 2) VOUT = 1.275V, VIN < 1.275V
(Note 9)
65
60
l
l
60
60
TYP
MAX
3
3
15
13
UNITS
mV
mV
25
50
90
mV
mV
10
20
32
mV
mV
100
150
190
mV
mV
200
260
350
mV
mV
300
370
550
mV
mV
30
100
400
1.8
60
180
700
3.3
µA
µA
µA
mA
µVRMS
75
68
dB
dB
140
mA
mA
mA
l
10
8
6
mA
20
15
µA
µA
(LT3010H) The l denotes the specifications which apply over the –40°C to 140°C operating temperature range, otherwise
specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN
Minimum Input Voltage
LT3010 ILOAD = 50mA
l
Regulated Output Voltage
(Note 3)
LT3010-5 VIN = 5.5V, ILOAD = 1mA
6V < VIN < 80V, 1mA < ILOAD < 50mA
l
ADJ Pin Voltage (Notes 2, 3)
LT3010 VIN = 3V, ILOAD = 1mA
4.25V < VIN < 80V, 1mA < ILOAD < 50mA
l
Line Regulation
LT3010-5
ΔVIN = 5.5V to 80V, ILOAD = 1mA
LT3010 (Note 2) ΔVIN = 3V to 80V, ILOAD = 1mA
l
l
Load Regulation
LT3010-5 VIN = 6V, ΔILOAD = 1mA to 50mA
VIN = 6V, ΔILOAD = 1mA to 50mA
l
LT3010 (Note 2) VIN = 4V, ΔILOAD = 1mA to 50mA
VIN = 4.25V, ΔILOAD = 1mA to 50mA
l
TYP
MAX
UNITS
3
4.25
V
4.925
4.825
5.000
5.000
5.075
5.15
V
V
1.258
1.230
1.275
1.275
1.292
1.313
V
V
3
3
20
15
mV
mV
25
50
100
mV
mV
10
20
45
mV
mV
30105fe
3
LT3010/LT3010-5
ELECTRICAL
CHARACTERISTICS
(LT3010H) The l denotes the specifications which apply over the –40°C to
140°C operating temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
Dropout Voltage
VIN = VOUT(NOMINAL)
(Notes 4, 5)
ILOAD = 1mA
ILOAD = 1mA
MIN
l
ILOAD = 10mA
ILOAD = 10mA
l
ILOAD = 50mA
ILOAD = 50mA
l
GND Pin Current
VIN = VOUT(NOMINAL)
(Notes 4, 6)
ILOAD = 0mA
ILOAD = 1mA
ILOAD = 10mA
ILOAD = 50mA
l
l
l
l
Output Voltage Noise
COUT = 10µF, ILOAD = 250mA, BW = 10Hz to 100kHz
ADJ Pin Bias Current
(Note 7)
Shutdown Threshold
VOUT = Off to On
VOUT = On to Off
SHDN Pin Current
(Note 8)
VSHDN = 0V
VSHDN = 6V
0.3
Quiescent Current in Shutdown VIN = 6V, VSHDN = 0V
LT3010 VIN = 7V(Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 50mA
LT3010-5 VIN = 7V(Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 50mA
Current Limit
VIN = 7V, VOUT = 0V
LT3010-5 VIN = 6V, ΔVOUT = –0.1V
LT3010 (Note 2) VIN = 4.25V, ΔVOUT = –0.1V
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 LT3010 (adjustable version) 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 LT3010
(adjustable version) is tested and specified for these conditions with an
external resistor divider (249k bottom, 392k top) for an output voltage of
3.3V. 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 (VIN – VDROPOUT).
Note 6: GND pin current is tested with VIN = VOUT (nominal) and a current
source load. This means the device is tested while operating in its dropout
region. This is the worst-case GND pin current. The GND pin current will
decrease slightly at higher input voltages.
65
60
l
l
l
Input Reverse Leakage Current VIN = –80V, VOUT = 0V
LT3010-5 VOUT = 5V, VIN < 5V
Reverse Output Current
LT3010 (Note 2) VOUT = 1.275V, VIN < 1.275V
(Note 9)
MAX
UNITS
100
150
220
mV
mV
200
260
380
mV
mV
300
370
600
mV
mV
30
100
400
1.8
80
200
750
3.5
µA
µA
µA
mA
100
l
l
Ripple Rejection
TYP
55
55
µVRMS
50
100
nA
1.3
0.8
2
V
V
0.5
0.1
2
0.5
µA
µA
1
5
µA
75
68
dB
dB
140
mA
mA
mA
l
10
8
6
mA
20
15
µA
µA
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 LT3010E 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 LT3010H is tested to the LT3010H Electrical Characteristics table at
140°C operating junction temperature. The LT3010MP is 100% tested and
guaranteed over the –55°C to 125°C operating junction temperature range.
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 (LT3010E and LT3010MP) or 140°C
(LT3010H) when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
may impair device reliability.
30105fe
4
LT3010/LT3010-5
TYPICAL PERFORMANCE CHARACTERISTICS
Typical Dropout Voltage
Guaranteed Dropout Voltage
600
500
= TEST POINTS
450
400
350
TJ = 125°C
300
250
200
TJ = 25°C
150
100
400
DROPOUT VOLTAGE (mV)
500
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
450
Dropout Voltage
500
TJ ≤ 125°C
300
TJ ≤ 25°C
200
100
0
5
0
10 15 20 25 30 35 40 45 50
OUTPUT CURRENT (mA)
0
5
250
150
0
–50 –25
10 15 20 25 30 35 40 45 50
OUTPUT CURRENT (mA)
LT3010 ADJ Pin Voltage
5.06
1.285
5.04
10
5
0
1.280
1.275
1.270
1.265
1.260
VSHDN = 0V
0
–50 –25
IL = 1mA
OUTPUT VOLTAGE (V)
15
25 50 75 100 125 150
TEMPERATURE (°C)
1.255
–50 –25
0
QUIESCENT CURRENT (µA)
25
20
15
10
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
30105 G07
0
120
100
80
60
0
VSHDN = VIN
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
1.6
RL = 25.5Ω
IL = 50mA*
1.4
1.2
RL = 51Ω
IL = 25mA*
1.0
0.8
RL = 127Ω
IL = 10mA*
0.6
0.4
RL = 1.27k IL = 1mA*
0.2
VSHDN = 0V
0
TJ = 25°C
*FOR VOUT = 1.275V
1.8
140
40
25 50 75 100 125 150
TEMPERATURE (°C)
LT3010 GND Pin Current
2.0
160
20
VSHDN = 0V
0
4.96
30105 G06
TJ = 25°C
180 RL = ∞
30
5
4.98
LT3010-5 Quiescent Current
VSHDN = VIN
35
5.00
4.92
–50 –25
25 50 75 100 125 150
TEMPERATURE (°C)
200
TJ = 25°C
RL = ∞
40
5.02
30105 G05
LT3010 Quiescent Current
45
IL = 1mA
4.94
30105 G04
50
5.08
GND PIN CURRENT (mA)
20
25 50 75 100 125 150
TEMPERATURE (°C)
LT3010-5 Output Voltage
1.290
VIN > 6V
RL = ∞, IL = 0 (LT3010-5)
RL = 250k, IL = 5µA (LT3010)
0
30105 G03
35
25
IL = 1mA
100
1.295
VSHDN = VIN
IL = 10mA
200
40
ADJ PIN VOLTAGE (V)
QUIESCENT CURRENT (µA)
Quiescent Current
QUIESCENT CURRENT (µA)
300
30105 G02
30105 G01
30
IL = 50mA
350
50
50
0
400
9
10
30105 G08
0
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
30105 G09
30105fe
5
LT3010/LT3010-5
TYPICAL PERFORMANCE CHARACTERISTICS
LT3010-5 GND Pin Current
GND Pin Current vs ILOAD
2.0
2.0
1.6
1.6
VIN = VOUT(NOMINAL) + 1V
1.8 TJ = 25°C
RL = 200Ω
IL = 25mA*
1.0
0.8
RL = 500Ω
IL = 10mA*
0.6
0.4
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
1.0
0.8
0.6
9
0
10
SHDN PIN CURRENT (µA)
SHDN PIN CURRENT (µA)
0.1
1.5 2 2.5 3 3.5 4
SHDN PIN VOLTAGE (V)
4.5
5
0.3
0.2
180
CURRENT LIMIT (mA)
100
80
60
0
100
80
60
40
0
–50 –25
25 50 75 100 125 150
TEMPERATURE (°C)
VIN = 7V
VOUT = 0V
100
80
60
40
20
9
10
0
–50 –25
25 50 75 100 125 150
TEMPERATURE (°C)
Reverse Output Current
120
20
8
0
30105 G15
100
140
40
3 4 5 6 7
INPUT VOLTAGE (V)
120
20
160
2
140
Current Limit
200
160
1
160
30105 G14
VOUT = 0V
180 TJ = 25°C
CURRENT LIMIT (mA)
180
0.4
Current Limit
120
25 50 75 100 125 150
TEMPERATURE (°C)
ADJ Pin Bias Current
0.5
30105 G13
140
0
200
0.6
0
–50 –25
200
0
0.4
30105 G12
0.1
0 0.5 1
0.6
0
–50 –25
10 15 20 25 30 35 40 45 50
OUTPUT CURRENT (mA)
VSHDN = 0V
0.7 CURRENT FLOWS
OUT OF SHDN PIN
0.2
ON-TO-OFF
0.8
SHDN Pin Current
0.3
0
5
0.8
0.4
0
1.0
30105 G11
TJ = 25°C
CURRENT FLOWS
OUT OF SHDN PIN
0.5
0
30105 G10
SHDN Pin Current
0.6
OFF-TO-ON
1.2
0.2
0.2
REVERSE OUTPUT CURRENT (µA)
0
1.2
0.4
RL = 5k, IL = 1mA*
0.2
1.4
ADJ PIN BIAS CURRENT (nA)
1.2
1.4
SHDN PIN THRESHOLD (V)
RL = 100Ω
IL = 50mA*
GND PIN CURRENT (mA)
GND PIN CURRENT (mA)
TJ = 25°C
1.8 *FOR VOUT = 5V
1.4
SHDN Pin Threshold
1.6
TJ = 25°C
VIN = 0V
CURRENT FLOWS
INTO OUTPUT PIN
VOUT = VADJ (LT3010)
VOUT = VSENSE
(LT3010-5)
90
80
70
60
50
40
ADJ
PIN CLAMP
(SEE APPLICATIONS
INFORMATION)
LT3010
30
20
LT3010-5
10
0
25 50 75 100 125 150
TEMPERATURE (°C)
30105 G17
0
0
1
2
3 4 5 6 7 8
OUTPUT VOLTAGE (V)
9
10
30105 G18
30105 G16
30105fe
6
LT3010/LT3010-5
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Output Current
50
40
30
20
0
–50 –25
90
76
80
74
72
70
68
66
62
LT3010
0
78
64
LT3010-5
10
100
RIPPLE REJECTION (dB)
60
VIN = 0V
VOUT = VADJ = 1.275V (LT3010)
VOUT = VSENSE = 5V (LT3010-5)
0
ILOAD = 50mA
–5
LOAD REGULATION (mV)
2.0
1.5
1.0
0.5
LT3010
–10
–15
–20
LT3010-5
–25
–30
–35
–40
–45
0
25 50 75 100 125 150
TEMPERATURE (°C)
–50
–50 –25
30105 G22
0
25 50 75 100 125 150
TEMPERATURE (°C)
LT3010-5 10Hz to 100kHz
Output Noise
COUT = 1µF
IL = 50mA
0
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
30105 G21
10
COUT = 1µF
IL = 50mA
1
0.1
0.01
100
10
1k
10k
FREQUENCY (Hz)
100k
30105 G24
LT3010-5 Transient Response
VOUT
100µV/DIV
1ms/DIV
COUT = 1µF
30105 G23
OUTPUT VOLTAGE
DEVIATION (V)
0
–50 –25
40
30
Output Noise Spectral Density
ΔIL = 1mA TO 50mA
30105 G25
LOAD CURRENT (mA)
MINIMUM INPUT VOLTAGE (V)
3.5
2.5
50
Load Regulation
0
3.0
COUT = 10µF
60
30105 G20
LT3010 Minimum Input Voltage
4.0
70
10
25 50 75 100 125 150
TEMPERATURE (°C)
3010 G19
VIN = 7V + 50mVRMS RIPPLE
IL = 50mA
20
VIN = 7V + 0.5VP-P RIPPLE AT f = 120Hz
IL = 50mA
VOUT = 1.275V
60
–50 –25
25 50 75 100 125 150
TEMPERATURE (°C)
Input Ripple Rejection
80
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
70
Input Ripple Rejection
RIPPLE REJECTION (dB)
REVERSE OUTPUT CURRENT (µA)
80
0.2
0.1
0
–0.1
VIN = 6V
CIN = 1µF CERAMIC
COUT = 1µF CERAMIC
ΔILOAD = 1mA TO 50mA
–0.2
50
25
0
0
200
400
600
TIME (µs)
800
1000
30105 G26
30105fe
7
LT3010/LT3010-5
PIN FUNCTIONS
OUT (Pin 1): Output. The output supplies power to the load.
A minimum output capacitor of 1µF is required to prevent
oscillations. Larger output capacitors will be required for
applications with large transient loads to limit peak voltage transients. See the Applications Information section
for more information on output capacitance and reverse
output characteristics.
SENSE (Pin 2): Sense. For the LT3010-5, the SENSE pin
is the input to the error amplifier. Optimum regulation will
be 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 will add to the dropout voltage of the regulator.
The SENSE pin bias current is 10µA at the nominal rated
output voltage.
ADJ (Pin 2): Adjust. For the adjustable LT3010, this is the
input to the error amplifier. This pin is internally clamped
to ±7V. It has a bias current of 50nA which flows into the
pin (see curve of ADJ Pin Bias Current vs Temperature
8
VIN
+
5
IN
OUT
LT3010
SHDN SENSE
1
2
RP
+
LOAD
GND
4, 9
30105 F01
Figure 1. Kelvin Sense Connection
in the Typical Performance Characteristics). The ADJ pin
voltage is 1.275V referenced to ground, and the output
voltage range is 1.275V to 60V.
NC (Pins 3, 6, 7): No Connection. May be floated, tied to
IN or tied to GND.
GND (Pin 4, Pin 9): Ground. The exposed backside (pin 9)
of the package is an electrical connection for GND. As
such, to ensure optimum device operation, pin 9 must be
connected directly to pin 4 on the PC board.
SHDN (Pin 5): Shutdown. The SHDN pin is used to put
the LT3010 into a low power shutdown state. The output
will be off when the SHDN pin is pulled low. The SHDN
pin can be driven either by 5V logic or open-collector logic
with a pull-up resistor. The pull-up resistor is only required
to supply the pull-up current of the open-collector gate,
normally several microamperes. If unused, the SHDN pin
must be tied to a logic high or VIN.
IN (Pin 8): Input. Power is supplied to the device through
the IN pin. A bypass capacitor is required on this pin 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 1µF to 10µF is sufficient. The
LT3010 is designed to withstand reverse voltages on the IN
pin with respect to ground and the OUT pin. In the case of
a reversed input, which can happen if a battery is plugged
in backwards, the LT3010 will act as if there is a diode in
series with its input. There will be no reverse current flow
into the LT3010 and no reverse voltage will appear at the
load. The device will protect both itself and the load.
30105fe
8
LT3010/LT3010-5
APPLICATIONS INFORMATION
The LT3010 is a 50mA high voltage low dropout regulator
with micropower quiescent current and shutdown. The
device is capable of supplying 50mA at a dropout voltage
of 300mV. The low operating quiescent current (30µA)
drops to 1µA in shutdown. In addition to the low quiescent current, the LT3010 incorporates several protection
features which make it ideal for use in battery-powered
systems. The device is protected against both reverse
input and reverse output voltages. In battery backup applications where the output can be held up by a backup
battery when the input is pulled to ground, the LT3010 acts
like it has a diode in series with its output and prevents
reverse current flow.
Adjustable Operation
The adjustable version of the LT3010 has an output voltage
range of 1.275V to 60V. The output voltage is set by the
ratio of two external resistors as shown in Figure 2. The
device servos the output to maintain the voltage at the
adjust pin at 1.275V referenced to ground. The current
in R1 is then equal to 1.275V/R1 and the current in R2 is
the current in R1 plus the ADJ pin bias current. The ADJ
pin bias current, 50nA at 25°C, flows through R2 into the
ADJ pin. The output voltage can be calculated using the
formula in Figure 2. The value of R1 should be less than
250k to minimize errors in the output voltage caused by
the ADJ pin bias current. Note that in shutdown the output
is turned off and the divider current will be zero.
A small capacitor (C1) placed in parallel with the top resistor
(R2) of the output divider is necessary for stability and transient performance of the adjustable LT3010. The impedance
of C1 at 10kHz should be less than the value of R1.
IN
VIN
OUT
R2
LT3010
C1
+
VOUT
ADJ
GND
R1
( )
VOUT = 1.275V 1 + R2 + (IADJ)(R2)
R1
VADJ = 1.275V
IADJ = 50nA AT 25°C
OUTPUT RANGE = 1.275V TO 60V
Figure 2. Adjustable Operation
30105 F02
The adjustable device is tested and specified with the
ADJ pin tied to the OUT pin and a 5µA DC load (unless
otherwise specified) for an output voltage of 1.275V. Specifications for output voltages greater than 1.275V will be
proportional to the ratio of the desired output voltage to
1.275V; (VOUT/1.275V). For example, load regulation for an
output current change of 1mA to 50mA is –10mV typical
at VOUT = 1.275V. At VOUT = 12V, load regulation is:
(12V/1.275V) • (–10mV) = –94mV
Output Capacitance and Transient Response
The LT3010 is designed to be stable with a wide range
of output capacitors. The ESR of the output capacitor
affects stability, most notably with small capacitors. A
minimum output capacitor of 1µF with an ESR of 3Ω or
less is recommended to prevent oscillations. The LT3010
is a micropower device and output transient response
will be a function of output capacitance. Larger values
of output capacitance decrease the peak deviations and
provide improved transient response for larger load current
changes. Bypass capacitors, used to decouple individual
components powered by the LT3010, will increase the
effective output capacitor value.
Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior across
temperature and applied voltage. The most common
dielectrics used are specified with EIA temperature characteristic codes of Z5U, Y5V, X5R and X7R. The Z5U and
Y5V dielectrics are good for providing high capacitances
in a small package, but they tend to have 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 over the operating temperature range. The X5R and X7R dielectrics result in 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. Care still must be exercised when
using X5R and X7R capacitors; the X5R and X7R codes
only specify operating temperature range and maximum
30105fe
9
LT3010/LT3010-5
APPLICATIONS INFORMATION
20
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
0
CHANGE IN VALUE (%)
X5R
–20
–40
–60
Y5V
0
2
4
6
8
10 12
DC BIAS VOLTAGE (V)
14
16
30105 F03
Figure 3. Ceramic Capacitor DC Bias Characteristics
40
CHANGE IN VALUE (%)
X5R
–20
–40
Y5V
–60
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
–100
25
75
–50 –25
0
50
TEMPERATURE (°C)
2. GND pin current multiplied by the input voltage:
IGND • VIN
The GND pin current can be found by examining the GND
Pin Current curves in the Typical Performance Characteristics. Power dissipation will be equal to the sum of the
two components listed above.
The LT3010 series regulators have internal thermal limiting
designed to protect the device during overload conditions.
For continuous normal conditions the maximum junction
temperature rating of 125°C (LT3010E/LT3010MP) or
140°C (LT3010H) must not be exceeded. It is important
to give careful consideration to all sources of thermal resistance from junction to ambient. Additional heat sources
mounted nearby must also be considered.
20
0
The power handling capability of the device will be limited by the maximum rated junction temperature (125°C,
LT3010E/LT3010MP or 140°C, LT3010H). The power dissipated by the device will be made up of two components:
1. Output current multiplied by the input/output voltage
differential: IOUT • (VIN – VOUT) and,
–80
–100
Thermal Considerations
100
125
30105 F04
Figure 4. Ceramic Capacitor Temperature Characteristics
capacitance change over temperature. 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 to improve as component
case size increases, but expected capacitance at operating
voltage should be verified.
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 microphone
works. For a ceramic capacitor the stress can be induced
by vibrations in the system or thermal transients.
For surface mount devices, heat sinking is accomplished
by using the heat spreading capabilities of the PC board
and its copper traces. Copper board stiffeners and plated
through-holes can also be used to spread the heat generated by power devices.
The following table lists thermal resistance for several
different board sizes and copper areas. All measurements
were taken in still air on 3/32" FR-4 board with one ounce
copper.
Table 1. Measured Thermal Resistance
COPPER AREA
TOPSIDE
BACKSIDE
THERMAL RESISTANCE
BOARD AREA (JUNCTION-TO-AMBIENT)
2500 sq mm 2500 sq mm
2500 sq mm
40°C/W
1000 sq mm 2500 sq mm
2500 sq mm
45°C/W
225 sq mm
2500 sq mm
2500 sq mm
50°C/W
100 sq mm
2500 sq mm
2500 sq mm
62°C/W
30105fe
10
LT3010/LT3010-5
APPLICATIONS INFORMATION
The thermal resistance junction-to-case (θJC), measured
at the exposed pad on the back of the die, is 16°C/W.
Continuous operation at large input/output voltage differentials and maximum load current is not practical
due to thermal limitations. Transient operation at high
input/output differentials is possible. The approximate
thermal time constant for a 2500sq mm 3/32" FR-4 board
with maximum topside and backside area for one ounce
copper is 3 seconds. This time constant will increase as
more thermal mass is added (i.e. vias, larger board, and
other components).
For an application with transient high power peaks, average
power dissipation can be used for junction temperature
calculations as long as the pulse period is significantly less
than the thermal time constant of the device and board.
Calculating Junction Temperature
Example 1: Given an output voltage of 5V, an input voltage range of 24V to 30V, an output current range of 0mA
to 50mA, and a maximum ambient temperature of 50°C,
what will the maximum junction temperature be?
The power dissipated by the device will be equal to:
IOUT(MAX) • (VIN(MAX) – VOUT) + (IGND • VIN(MAX))
where:
IOUT(MAX) = 50mA
VIN(MAX) = 30V
IGND at (IOUT = 50mA, VIN = 30V) = 1mA
The maximum junction temperature will then be equal to
the maximum junction temperature rise above ambient
plus the maximum ambient temperature or:
TJMAX = 50°C + 65.5°C = 115.5°C
Example 2: Given an output voltage of 5V, an input voltage
of 48V that rises to 72V for 5ms(max) out of every 100ms,
and a 5mA load that steps to 50mA for 50ms out of every
250ms, what is the junction temperature rise above ambient? Using a 500ms period (well under the time constant
of the board), power dissipation is as follows:
P1(48V in, 5mA load) = 5mA • (48V – 5V)
+ (200µA • 48V) = 0.23W
P2(48V in, 50mA load) = 50mA • (48V – 5V)
+ (1mA • 48V) = 2.20W
P3(72V in, 5mA load) = 5mA • (72V – 5V)
+ (200µA • 72V) = 0.35W
P4(72V in, 50mA load) = 50mA • (72V – 5V)
+ (1mA • 72V) = 3.42W
Operation at the different power levels is as follows:
76% operation at P1, 19% for P2, 4% for P3, and
1% for P4.
PEFF = 76%(0.23W) + 19%(2.20W) + 4%(0.35W)
+ 1%(3.42W) = 0.64W
With a thermal resistance in the range of 40°C/W to
62°C/W, this translates to a junction temperature rise above
ambient of 26°C to 38°C.
So:
High Temperature Operation
P = 50mA • (30V – 5V) + (1mA • 30V) = 1.28W
Care must be taken when designing LT3010H applications to
operate at high ambient temperatures. The LT3010H works
at elevated temperatures but erratic operation can occur
due to unforeseen variations in external components. Some
tantalum capacitors are available for high temperature
operation, but ESR is often several ohms; capacitor ESR
The thermal resistance will be in the range of 40°C/W to
62°C/W depending on the copper area. So the junction
temperature rise above ambient will be approximately
equal to:
1.31W • 50°C/W = 65.5°C
30105fe
11
LT3010/LT3010-5
APPLICATIONS INFORMATION
above 3Ω is unsuitable for use with the LT3010H. Ceramic
capacitor manufacturers (Murata, AVX, TDK, and Vishay
Vitramon at this writing) now offer ceramic capacitors that
are rated to 150°C using an X8R dielectric. Device instability
will occur if output capacitor value and ESR are outside
design limits at elevated temperature 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.
Leakages in capacitors or from solder flux left after insufficient board cleaning adversely affects low quiescent
current operation. Consider junction temperature increase
due to power dissipation in both the junction and nearby
components to ensure maximum specifications are not
violated for the LT3010H or external components.
Protection Features
The LT3010 incorporates several protection features which
make it ideal for use in battery-powered circuits. In addition to the normal protection features associated with
monolithic regulators, such as current limiting and thermal
limiting, the device is protected against reverse-input voltages, and reverse voltages from output to input.
Current limit protection and thermal overload protection
are intended to protect the device against current overload
conditions at the output of the device. For normal operation, the junction temperature should not exceed 125°C
(LT3010E/LT3010MP) or 140°C (LT3010H).
The input of the device will withstand reverse voltages
of 80V. Current flow into the device will be limited to less
than 6mA (typically less than 100µA) and no negative
voltage will appear at the output. The device will protect
both itself and the load. This provides protection against
batteries which can be plugged in backward.
The ADJ pin of the adjustable device can be pulled above
or below ground by as much as 7V without damaging the
device. If the input is left open circuit or grounded, the
ADJ pin will act like an open circuit when pulled below
ground, and like a large resistor (typically 100k) in series
with a diode when pulled above ground. If the input is
powered by a voltage source, pulling the ADJ pin below
the reference voltage will cause the device to try and force
the current limit current out of the output. This will cause
the output to go to a unregulated high voltage. Pulling
the ADJ pin above the reference voltage will turn off all
output current.
In situations where the ADJ pin is connected to a resistor
divider that would pull the ADJ pin above its 7V clamp voltage if the output is pulled high, the ADJ pin input current
must be limited to less than 5mA. For example, a resistor
divider is used to provide a regulated 1.5V output from the
1.22V reference when the output is forced to 60V. The top
resistor of the resistor divider must be chosen to limit the
current into the ADJ pin to less than 5mA when the ADJ
pin is at 7V. The 53V difference between the OUT and ADJ
pins divided by the 5mA maximum current into the ADJ
pin yields a minimum top resistor value of 10.6k.
30105fe
12
LT3010/LT3010-5
APPLICATIONS INFORMATION
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 will follow
the curve shown in Figure 5. The rise in reverse output
current above 7V occurs from the breakdown of the 7V
clamp on the ADJ pin. With a resistor divider on the
regulator output, this current will be reduced depending
on the size of the resistor divider.
When the IN pin of the LT3010 is forced below the OUT
pin or the OUT pin is pulled above the IN pin, input current will typically drop to less than 2µA. This can happen
if the input of the LT3010 is connected to a discharged
(low voltage) battery and the output is held up by either
a backup battery or a second regulator circuit. The state
of the SHDN pin will have no effect on the reverse output
current when the output is pulled above the input.
REVERSE OUTPUT CURRENT (µA)
100
TA = 25°C
90 VIN = 0V
CURRENT FLOWS
80
INTO OUTPUT PIN
70 VOUT = VADJ (LT3010)
VOUT = VSENSE
60 (LT3010-5)
ADJ
PIN CLAMP
(SEE ABOVE)
50
40
LT3010
30
20
LT3010-5
10
0
0
1
2
3 4 5 6 7 8
OUTPUT VOLTAGE (V)
9
10
30105 F05
Figure 5. Reverse Output Current
30105fe
13
LT3010/LT3010-5
TYPICAL APPLICATIONS
5V Buck Converter with Low Current Keep Alive Backup
D2
D1N914
6
VIN
5.5V*
TO 60V
4
C3
4.7µF
100V
CERAMIC
VIN
BOOST
SW
2
14
SHDN
BIAS
SYNC
FB
GND
OPERATING
CURRENT
5
IN
LT3010-5
SHDN
LOW HIGH
OUT
SENSE
VOUT
5V
1A/50mA
10
R1
15.4k
12
R2
4.99k
VC
1, 8, 9, 16 11
8
L1†
15µH
D1
10MQ060N
LT1766
15
C2
0.33µF
+
C1
100µF 10V
SOLID
TANTALUM
CC
1nF
1
30105 TA03
* FOR INPUT VOLTAGES BELOW 7.5V,
SOME RESTRICTIONS MAY APPLY
†
INCREASE L1 TO 30µH FOR LOAD
CURRENTS ABOVE 0.6A AND TO
60μH ABOVE 1A
2
GND
4
Buck Converter
Efficiency vs Load Current
100
VOUT = 5V
L = 68µH
EFFICIENCY (%)
90
VIN = 10V
VIN = 42V
80
70
60
50
0
0.25
1.00
0.50
0.75
LOAD CURRENT (A)
1.25
30105 TA04
30105fe
14
LT3010/LT3010-5
TYPICAL APPLICATIONS
LT3010 Telecom Application
VIN
48V
(72V TRANSIENT)
IN
1µF
OUT
LT3010-5
SHDN
NO PROTECTION
DIODE NEEDED!
SENSE
1µF
GND
+
LOAD:
SYSTEM MONITOR
ETC
OFF ON
–
BACKUP
BATTERY
30105 TA05b
Constant Brightness for Indicator LED over Wide Input Voltage Range
RETURN
OFF ON
OUT
IN
1µF
LT3010
SHDN
GND
–48V
1µF
ADJ
ILED = 1.275V/RSET
–48V CAN VARY FROM –4V TO –80V
RSET
30105 TA06
30105fe
15
LT3010/LT3010-5
PACKAGE DESCRIPTION
MS8E Package
8-Lead Plastic MSOP, Exposed Die Pad
(Reference LTC DWG # 05-08-1662 Rev I)
BOTTOM VIEW OF
EXPOSED PAD OPTION
1.88
(.074)
1
1.88 ± 0.102
(.074 ± .004)
0.29
REF
1.68
(.066)
0.889 ± 0.127
(.035 ± .005)
0.05 REF
5.23
(.206)
MIN
DETAIL “B”
CORNER TAIL IS PART OF
DETAIL “B” THE LEADFRAME FEATURE.
FOR REFERENCE ONLY
NO MEASUREMENT PURPOSE
1.68 ± 0.102 3.20 – 3.45
(.066 ± .004) (.126 – .136)
8
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.65
(.0256)
BSC
0.42 ± 0.038
(.0165 ± .0015)
TYP
8
7 6 5
0.52
(.0205)
REF
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
4.90 ± 0.152
(.193 ± .006)
DETAIL “A”
0° – 6° TYP
GAUGE PLANE
0.53 ± 0.152
(.021 ± .006)
DETAIL “A”
1
2 3
4
1.10
(.043)
MAX
0.86
(.034)
REF
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
TYP
0.65
(.0256)
BSC
0.1016 ± 0.0508
(.004 ± .002)
MSOP (MS8E) 0910 REV I
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
6. EXPOSED PAD DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD
SHALL NOT EXCEED 0.254mm (.010") PER SIDE.
30105fe
16
LT3010/LT3010-5
REVISION HISTORY
(Revision history begins at Rev D)
REV
DATE
DESCRIPTION
PAGE NUMBER
D
5/10
Added MP-Grade to All Sections
Updated Related Parts List
18
E
4/11
Update MSOP Package Drawing
16
2 to 4, 10, 12
30105fe
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
17
LT3010/LT3010-5
TYPICAL APPLICATION
LT3010 Automotive Application
VIN
12V
(LATER 42V)
+
NO PROTECTION
DIODE NEEDED!
1µF
IN
OUT
LT3010-5
SENSE
SHDN
GND
1µF
LOAD: CLOCK,
SECURITY SYSTEM
ETC
OFF ON
30105 TA05a
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
LT1676
60V, 440mA (IOUT), 100kHz, High Efficiency
Step-Down DC/DC Converter
VIN: 7.4V to 60V, VOUT = 1.24V, IQ = 3.2mA, ISD = 2.5µA, S8 Package
LT1761
100mA, Low Noise Micropower, LDO
VIN: 1.8V to 20V, VOUT = 1.22V, VDO = 0.3V, IQ = 20µA, ISD =
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