LINEAR TECHNOLOGY LT3010, LT3010-5 Technical data

LT3010/LT3010-5

50mA, 3V to 80V

Low Dropout

Micropower Linear Regulator

FEATURES

n

Wide Input Voltage Range: 3V to 80V

n

Low Quiescent Current: 30μA

n

Low Dropout Voltage: 300mV

n

Output Current: 50mA

n

Thermally Enhanced 8-Lead MSOP Package

n

No Protection Diodes Needed

n

Fixed Output Voltage: 5V (LT3010-5)

n

Adjustable Output from 1.275V to 60V (LT3010)

n

1μA Quiescent Current in Shutdown

n

Stable with 1μF Output Capacitor

n

Stable with Aluminum, Tantalum or Ceramic

Capacitors

n

Reverse-Battery Protection

n

No Reverse Current Flow from Output

n

Thermal Limiting

APPLICATIONS

n

Low Current High Voltage Regulators

n

Regulator for Battery-Powered Systems

n

Telecom Applications

n

Automotive Applications

DESCRIPTION

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.

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.

The device is available in a fi xed 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.

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

LT3010-5

SHDN

OUT

SENSE

GND

30105 TA01

V

SHDN

V

IN

5.4V TO
80V

(PIN 5)

<0.3V
>2.0V

1μF

OUTPUT

OFF

ON

1μF

V

OUT

5V
50mA

350

300

250

200

150

100

DROPOUT VOLTAGE (mV)

50

0

0

Dropout Voltage

10 20 30 50

OUTPUT CURRENT (mA)

40

30105 TA02

30105fc

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 ......................... Indefi nite

Storage Temperature Range .................. –65°C to 150°C

Operating Junction Temperature Range

(Notes 3, 10, 11)

OUT

SENSE/ADJ*

GND

*SENSE FOR LT3010-5, ADJ FOR LT3010

= 125°C (LT3010E), θJA = 40°C/W, θJC = 16°C/W†

T

JMAX

= 140°C (LT3010H), θJA = 40°C/W, θJC = 16°C/W†

T

JMAX

SEE APPLICATIONS INFORMATION SECTION.

EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB

TOP VIEW

1
2

NC

3
4

MS8E PACKAGE

8-LEAD PLASTIC MSOP

†MEASURED AT BOTTOM PAD

8
7

9

6
5

IN
NC
NC

SHDN

LT3010E ............................................. –40°C to 125°C

LT3010H ............................................–40°C to 140°C

Lead Temperature (Soldering, 10 sec) ................. 300°C

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

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
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/

(LT3010E) The

ELECTRICAL CHARACTERISTICS

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.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage LT3010 I
Regulated Output Voltage

(Note 3)
ADJ Pin Voltage (Notes 2, 3) LT3010 VIN = 3V, I

Line Regulation LT3010-5 ΔVIN = 5.5V to 80V, I

Load Regulation LT3010-5 VIN = 6V, ΔI

LT3010-5 V
6V < V

4V < V

LT3010 (Note 2) ΔV

V

= 50mA

LOAD

= 5.5V, I

IN

IN

IN

= 3V to 80V, I

IN

= 6V, ΔI

IN

= 1mA

LOAD

< 80V, 1mA < I

= 1mA

LOAD

< 80V, 1mA < I

= 1mA to 50mA

LOAD

= 1mA to 50mA l

LOAD

LOAD

LOAD

< 50mA l

LOAD

< 50mA l

LOAD

= 1mA

= 1mA

l

4.925

4.850

1.258

1.237

l

34 V

5.000

5.000

1.275

1.275

5.075

5.150

1.292

1.313

3

15

3

13

25 50

90

mV
mV

mV
mV

30105fc

2

V
V

V
V

LT3010/LT3010-5

ELECTRICAL CHARACTERISTICS

(LT3010E) The l denotes the specifi cations which apply over the –40°C to

= 0.5V
= 0.5V

= 25°C.

J

, f

P-P

RIPPLE

, f

P-P

RIPPLE

= 120Hz, I
= 120Hz, I

LOAD
LOAD

= 50mA
= 50mA

10 20

32

100 150

190

200 260

350

300 370

550

l
l
l
l

l
l

0.3

30
100
400

1.8

1.3

1.1

60
180
700

3.3

2V

0.5

0.120.5

65

75

60

68

mV
mV

mV
mV

mV
mV

mV
mV

μA
μA
μA

mA

RMS

μA
μA

dB
dB

140 mA

l

60

l

60

l

10

8

6mA

20

15

mA
mA

μA
μA

125°C operating temperature range, otherwise specifi cations are at T

PARAMETER CONDITIONS MIN TYP MAX UNITS

= 4V, ΔI

IN

= 4V, ΔI

IN

= 50mA, BW = 10Hz to 100kHz 100 μV

LOAD

Dropout Voltage
V

= V

IN

OUT(NOMINAL)

(Notes 4, 5)

GND Pin Current
V

= V

IN

OUT(NOMINAL)

(Notes 4, 6)

Output Voltage Noise C

LT3010 (Note 2) V
V

= 1mA

I

LOAD

I

= 1mA l

LOAD

I

= 10mA

LOAD

I

= 10mA l

LOAD

I

= 50mA

LOAD

I

= 50mA l

LOAD

= 0mA

I

LOAD

I

= 1mA

LOAD

I

= 10mA

LOAD

I

= 50mA

LOAD

= 10μF, I

OUT

ADJ Pin Bias Current (Note 7) 50 100 nA
Shutdown Threshold V

SHDN Pin Current
(Note 8)

Quiescent Current in Shutdown V
Ripple Rejection LT3010 V

Current Limit V

Input Reverse Leakage Current VIN = –80V, V
Reverse Output Current

(Note 9)

= Off to On

OUT

V

= On to Off

OUT

= 0V

V

SHDN

V

= 6V

SHDN

= 6V, V

IN

= 0V 1 5 μA

SHDN

LT3010-5 V

= 7V, V

IN

OUT

= 0V
LT3010-5 V
LT3010 (Note 2) V

= 0V

OUT

LT3010-5 V
LT3010 (Note 2) V

= 7V(Avg), V

IN

= 7V(Avg), V

IN

= 6V, ΔV

IN

= 4V, ΔV

IN

= 5V, VIN < 5V

OUT

= 1.275V, VIN < 1.275V

OUT

= 1mA to 50mA

LOAD

= 1mA to 50mA l

LOAD

RIPPLE
RIPPLE

= –0.1V

OUT

= –0.1V

OUT

V

(LT3010H) 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.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage LT3010 I
Regulated Output Voltage

(Note 3)

LT3010-5 V
6V < V

ADJ Pin Voltage (Notes 2, 3) LT3010 VIN = 3V, I

4.25V < V

LOAD

= 5.5V, I

IN

= 50mA

= 1mA

LOAD

< 80V, 1mA < I

IN

= 1mA

LOAD

< 80V, 1mA < I

IN

Line Regulation LT3010-5 ΔVIN = 5.5V to 80V, I

LT3010 (Note 2) ΔV

Load Regulation LT3010-5 VIN = 6V, ΔI

V
LT3010 (Note 2) VIN = 4V, ΔI

V

= 3V to 80V, I

IN

= 6V, ΔI

IN

= 4.25V, ΔI

IN

= 1mA to 50mA

LOAD

= 1mA to 50mA l

LOAD

= 1mA to 50mA

LOAD

LOAD

< 50mA l

LOAD

< 50mA l

LOAD

= 1mA

LOAD

= 1mA

LOAD

= 1mA to 50mA l

l

4.925

4.825

1.258

1.230

l
l

3 4.25 V

5.000

5.000

1.275

1.275

5.075

5.15

1.292

1.313

3

20

3

15

25 50

100

10 20

45

mV
mV

mV
mV

mV
mV

30105fc

3

V
V

V
V

LT3010/LT3010-5

ELECTRICAL CHARACTERISTICS

(LT3010H) The l denotes the specifi cations which apply over the –40°C to

= 0.5V
= 0.5V

= 25°C.

J

, f

P-P

RIPPLE

, f

P-P

RIPPLE

= 120Hz, I
= 120Hz, I

LOAD
LOAD

= 50mA
= 50mA

100 150

220

200 260

380

300 370

600

l
l
l
l

l
l

0.3

30
100
400

1.8

1.3

0.8

80
200
750

3.5

2V

0.5

0.120.5

65
60

l
l

55

l

55

l

75
68

140 mA

6mA

10

20

8

15

mV
mV

mV
mV

mV
mV

μA
μA
μA

mA

RMS

μA
μA

dB
dB

mA
mA

μA
μA

140°C operating temperature range, otherwise specifi cations are at T

PARAMETER CONDITIONS MIN TYP MAX UNITS

Dropout Voltage

= V

V

IN

OUT(NOMINAL)

(Notes 4, 5)

GND Pin Current
V

= V

IN

OUT(NOMINAL)

(Notes 4, 6)

Output Voltage Noise C
ADJ Pin Bias Current (Note 7) 50 100 nA
Shutdown Threshold V

SHDN Pin Current
(Note 8)

Quiescent Current in Shutdown V
Ripple Rejection LT3010 V

Current Limit V

Input Reverse Leakage Current VIN = –80V, V
Reverse Output Current

(Note 9)

= 1mA

I

LOAD

I

= 1mA l

LOAD

I

= 10mA

LOAD

I

= 10mA l

LOAD

I

= 50mA

LOAD

I

= 50mA l

LOAD

= 0mA

I

LOAD

I

= 1mA

LOAD

I

= 10mA

LOAD

I

= 50mA

LOAD

= 10μF, I

OUT

= Off to On

OUT

V

= On to Off

OUT

= 0V

V

SHDN

V

= 6V

SHDN

= 6V, V

IN

LT3010-5 V

= 7V, V

IN

LT3010-5 V
LT3010 (Note 2) V

LT3010-5 V
LT3010 (Note 2) V

= 250mA, BW = 10Hz to 100kHz 100 μV

LOAD

= 0V 1 5 μA

SHDN

= 7V(Avg), V

OUT

= 0V

OUT

IN

= 7V(Avg), V

IN

= 6V, ΔV

IN

= 4.25V, ΔV

IN

= 0V

= 5V, VIN < 5V

OUT

= 1.275V, VIN < 1.275V

OUT

OUT

RIPPLE
RIPPLE

= –0.1V

= –0.1V

OUT

V

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 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 LT3010
(adjustable version) is tested and specifi ed 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 specifi ed output current. In dropout, the
output voltage will be equal to (V

Note 6: GND pin current is tested with V

IN

– V

DROPOUT

= V

IN

).

(nominal) and a current

OUT

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.

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 LT3010E 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 LT3010H is tested to the LT3010H 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 (LT3010E) or 140°C (LT3010H) when
overtemperature protection is active. Continuous operation above the
specifi ed maximum operating junction temperature may impair device
reliability.

30105fc

4

LT3010/LT3010-5

TYPICAL PERFORMANCE CHARACTERISTICS

Typical Dropout Voltage Guaranteed Dropout Voltage Dropout Voltage

500

450

400

350

300

250

200

150

DROPOUT VOLTAGE (mV)

100

50

0

0

TJ = 125°C

= 25°C

T

J

1052015 30 35 4525 50

OUTPUT CURRENT (mA)

40

30105 G01

600

500

400

300

200

DROPOUT VOLTAGE (mV)

100

0

= TEST POINTS

TJ ≤ 125°C

TJ ≤ 25°C

10 20 30 40

OUTPUT CURRENT (mA)

505015253545

30105 G02

Quiescent Current LT3010 ADJ Pin Voltage LT3010-5 Output Voltage

40

35

V

30

25

VIN > 6V

= ∞, IL = 0 (LT3010-5)

R

20

L

= 250k, IL = 5μA (LT3010)

R

L

15

10

QUIESCENT CURRENT (μA)

5

0

–25 0 50

–50

SHDN

V

25

TEMPERATURE (°C)

SHDN

= V

= 0V

IN

75 100 125 150

30105 G04

1.295
IL = 1mA

1.290

1.285

1.280

1.275

1.270

ADJ PIN VOLTAGE (V)

1.265

1.260

1.255

–50 0 50 75–25 25 100 150125

TEMPERATURE (°C)

30105 G05

500

450

400

350

300

250

200

150

DROPOUT VOLTAGE (mV)

100

50

0

–50 0 50 75–25 25 100 150125

5.08
IL = 1mA

5.06

5.04

5.02

5.00

4.98

OUTPUT VOLTAGE (V)

4.96

4.94

4.92

–50 0 50 75–25 25 100 150125

IL = 50mA

IL = 10mA

IL = 1mA

TEMPERATURE (°C)

TEMPERATURE (°C)

30105 G03

30105 G06

LT3010 Quiescent Current LT3010-5 Quiescent Current LT3010 GND Pin Current

50

TJ = 25°C

45

= ∞

R

L

40

35

30

25

20

15

QUIESCENT CURRENT (μA)

10

5

0

0

2143679510

INPUT VOLTAGE (V)

V

V

SHDN

SHDN

= V

= 0V

IN

8

30105 G07

200

TJ = 25°C

180

= ∞

R

L

160

140

120

100

80

60

QUIESCENT CURRENT (μA)

40

20

0

0

2143679510

INPUT VOLTAGE (V)

V

V

SHDN

SHDN

= V

= 0V

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

IN

8

30105 G08

GND PIN CURRENT (mA)

0.4

0.2

0

0

2143679510

RL = 25.5Ω

I

I

RL = 1.27k IL = 1mA*

INPUT VOLTAGE (V)

TJ = 25°C
*FOR V

= 50mA*

L

RL = 127Ω

= 10mA*

L

= 1.275V

OUT

RL = 51Ω

= 25mA*

I

L

8

30105 G09

30105fc

5

LT3010/LT3010-5

TYPICAL PERFORMANCE CHARACTERISTICS

LT3010-5 GND Pin Current GND Pin Current vs I

2.0
TJ = 25°C

1.8

*FOR V

1.6

1.4

1.2

1.0

0.8

0.6

GND PIN CURRENT (mA)

0.4

0.2

0

0

= 5V

OUT

2143679510

INPUT VOLTAGE (V)

RL = 100Ω

= 50mA*

I

L

RL = 200Ω

= 25mA*

I

L

RL = 500Ω

= 10mA*

I

L

RL = 5k, IL = 1mA*

8

30105 G10

2.0
VIN = V

1.8

1.6

1.4

1.2

1.0

0.8

0.6

GND PIN CURRENT (mA)

0.4

0.2

0

OUT(NOMINAL)

= 25°C

T

J

0

1052015 30 35 4525 50

OUTPUT CURRENT (mA)

LOAD

+ 1V

40

30105 G11

SHDN Pin Threshold

1.6

1.4

1.2

1.0

0.8

0.6

0.4

SHDN PIN THRESHOLD (V)

0.2

0

–50 25–25 0 50 75 100 125 150

SHDN Pin Current SHDN Pin Current ADJ Pin Bias Current

0.6

0.5

0.4

0.3

0.2

SHDN PIN CURRENT (μA)

0.1

0

1234

TJ = 25°C
CURRENT FLOWS
OUT OF SHDN PIN

SHDN PIN VOLTAGE (V)

30105 G13

50.50 1.5 2.5 3.5 4.5

0.8
V

= 0V

SHDN

CURRENT FLOWS

0.7
OUT OF SHDN PIN

0.6

0.5

0.4

0.3

0.2

SHDN PIN CURRENT (μA)

0.1

0

–50 25–25 0 50 75 100 125 150

TEMPERATURE (°C)

30105 G14

200

180

160

140

120

100

80

60

ADJ PIN BIAS CURRENT (nA)

40

20

0

–50 0 50 75–25 25 100 150125

OFF-TO-ON

ON-TO-OFF

TEMPERATURE (°C)

TEMPERATURE (°C)

30105 G12

30105 G15

Current Limit Current Limit Reverse Output Current

200

V

= 0V

OUT

180

= 25°C

T

J

160

140

120

100

80

60

CURRENT LIMIT (mA)

40

20

0

0

2143679510

8

INPUT VOLTAGE (V)

30105 G16

200

VIN = 7V

180

160

140

120

100

CURRENT LIMIT (mA)

= 0V

V

OUT

80

60

40

20

0

–50 0 50 75–25 25 100 150125

TEMPERATURE (°C)

30105 G17

100

TJ = 25°C

90

= 0V

V

IN

CURRENT FLOWS

80

INTO OUTPUT PIN

= V

V

70

OUT

ADJ

= V

V

OUT

60

50

40

30

20

REVERSE OUTPUT CURRENT (μA)

10

0

0

SENSE

(LT3010-5)

LT3010

2143679510

6

(LT3010)

PIN CLAMP

(SEE APPLICATIONS

INFORMATION)

LT3010-5

OUTPUT VOLTAGE (V)

ADJ

8

30105 G18

30105fc

LT3010/LT3010-5

TYPICAL PERFORMANCE CHARACTERISTICS

Reverse Output Current Input Ripple Rejection Input Ripple Rejection

80

VIN = 0V

= V

V

OUT

70

V

OUT

60

50

40

30

20

REVERSE OUTPUT CURRENT (μA)

10

0

–50 0 50 75–25 25 100 150125

= 1.275V (LT3010)

ADJ

= V

= 5V (LT3010-5)

SENSE

LT3010-5

LT3010

TEMPERATURE (°C)

3010 G19

80

78

76

74

72

70

68

66

RIPPLE REJECTION (dB)

64

VIN = 7V + 0.5V

= 50mA

I

L

62

= 1.275V

V

OUT

60

–50 0 50 75–25 25 100 150125

RIPPLE AT f = 120Hz

P-P

TEMPERATURE (°C)

30105 G20

100

VIN = 7V + 50mV

90

= 50mA

I

L

80

70

60
50

40

30

RIPPLE REJECTION (dB)

20

10

0

10

100 1k 10k 100k 1M

RIPPLE

RMS

C

C

= 1μF

OUT

FREQUENCY (Hz)

OUT

= 10μF

30105 G21

LT3010 Minimum Input Voltage Load Regulation Output Noise Spectral Density

4.0
I

= 50mA

LOAD

3.5

3.0

2.5

2.0

1.5

1.0

MINIMUM INPUT VOLTAGE (V)

0.5

0

–50 0 50 75–25 25 100 150125

TEMPERATURE (°C)

30105 G22

0

ΔIL = 1mA TO 50mA

–5

–10

–15

–20

–25

–30

–35

LOAD REGULATION (mV)

–40

–45

–50

–50 0 50 75–25 25 100 150125

TEMPERATURE (°C)

LT3010-5

LT3010

30105 G23

10

C

= 1μF

OUT

= 50mA

I

L

1

0.1

OUTPUT NOISE SPECTRAL DENSITY (μV/√Hz)

0.01
10 1k 10k 100k

100

FREQUENCY (Hz)

LT3010-5 10Hz to 100kHz
Output Noise LT3010-5 Transient Response

0.2

0.1

V

OUT

100μV/DIV

C

OUT

= 50mA

I

L

= 1μF

1ms/DIV

30105 G25

0

–0.1

DEVIATION (V)

OUTPUT VOLTAGE

–0.2

50

25

0

LOAD CURRENT (mA)

0

200 400 600 1000

VIN = 6V

= 1μF CERAMIC

C

IN

= 1μF CERAMIC

C

OUT

= 1mA TO 50mA

ΔI

LOAD

TIME (μs)

800

30105 G26

30105 G24

30105fc

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 amplifi er. 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 (R

) of

P

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 amplifi er. This pin is internally clamped
to ±7V. It has a bias current of 50nA which fl ows into the
pin (see curve of ADJ Pin Bias Current vs Temperature

R

P

GND

OUT

SENSE

4, 9

1

2

LOAD

30105 F01

8

IN

LT3010

5

+ +

V

IN

Figure 1. Kelvin Sense Connection

SHDN

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 fl oated, 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 V

IN

.

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 fi lter 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 suffi cient. 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 fl ow
into the LT3010 and no reverse voltage will appear at the
load. The device will protect both itself and the load.

8

30105fc

APPLICATIONS INFORMATION

LT3010/LT3010-5

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 fl ow.

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, fl ows 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

OUT

LT3010

V

IN

V

V
I
OUTPUT RANGE = 1.275V TO 60V

Figure 2. Adjustable Operation

GND

= 1.275V

OUT

= 1.275V

ADJ

= 50nA AT 25°C

ADJ

ADJ

R2 C1

R1

R2

+ (I

)(R2)1 +

()

ADJ

R1

V

OUT

+

30105 F02

The adjustable device is tested and specifi ed with the
ADJ pin tied to the OUT pin and a 5μA DC load (unless
otherwise specifi ed) for an output voltage of 1.275V. Speci­fi cations for output voltages greater than 1.275V will be
proportional to the ratio of the desired output voltage to

1.275V; (V

/1.275V). For example, load regulation for an

OUT

output current change of 1mA to 50mA is –10mV typical
at V

= 1.275V. At V

OUT

= 12V, load regulation is:

OUT

(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 specifi ed 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 coeffi cients 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

30105fc

9

LT3010/LT3010-5

APPLICATIONS INFORMATION

20

0

–20

–40

–60

CHANGE IN VALUE (%)

–80

–100

04 8102 6 12 14

Figure 3. Ceramic Capacitor DC Bias Characteristics

40

20

0

–20

–40

–60

CHANGE IN VALUE (%)

–80

BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF

–100

Figure 4. Ceramic Capacitor Temperature Characteristics

–25 0 50 100 125

–50

BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF

X5R

Y5V

DC BIAS VOLTAGE (V)

X5R

Y5V

25 75

TEMPERATURE (°C)

16

30105 F03

30105 F04

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 signifi cant 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 verifi ed.

Voltage and temperature coeffi cients 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.

Thermal Considerations

The power handling capability of the device will be lim­ited by the maximum rated junction temperature (125°C,
LT3010E 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: I

OUT

IN

– V

OUT

) and,

• (V

2. GND pin current multiplied by the input voltage:

• V

I

GND

IN

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) 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.

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

BOARD AREA

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

THERMAL RESISTANCE

(JUNCTION-TO-AMBIENT)TOPSIDE BACKSIDE

The thermal resistance junction-to-case (θJC), measured
at the exposed pad on the back of the die, is 16°C/W.

10

30105fc

APPLICATIONS INFORMATION

LT3010/LT3010-5

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 signifi cantly 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:
I

OUT(MAX)

• (V

IN(MAX)

– V

OUT

) + (I

GND

• V

IN(MAX)

)
where:
I

OUT(MAX)

= 50mA

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.

= 76%(0.23W) + 19%(2.20W) + 4%(0.35W)

P

EFF

+ 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.

at (I

= 30V

= 50mA, VIN = 30V) = 1mA

OUT

V

IN(MAX)

I

GND

So:
P = 50mA • (30V – 5V) + (1mA • 30V) = 1.28W
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
The maximum junction temperature will then be equal to

the maximum junction temperature rise above ambient
plus the maximum ambient temperature or:

T

= 50°C + 65.5°C = 115.5°C

JMAX

High Temperature Operation

Care must be taken when designing LT3010/LT3010-5
applications to operate at high ambient temperatures.
The LT3010/LT3010-5 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 above 3Ω is unsuit­able for use with the LT3010/LT3010-5. 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

30105fc

11

LT3010/LT3010-5

APPLICATIONS INFORMATION

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 fl ux left after insuffi ­cient 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 specifi cations are not violated
for the LT3010/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) or 140°C (LT3010H).

The input of the device will withstand reverse voltages
of 80V. Current fl ow 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.

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 fl ow 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.

100

TA = 25°C

90

= 0V

V

IN

CURRENT FLOWS

80

INTO OUTPUT PIN

= V

V

70

OUT

V

OUT

60

(LT3010-5)

50

40

30

20

REVERSE OUTPUT CURRENT (μA)

10

0

01234567 8910

(LT3010)

ADJ

= V

SENSE

LT3010

LT3010-5

OUTPUT VOLTAGE (V)

ADJ

PIN CLAMP

(SEE ABOVE)

30105 F05

12

Figure 5. Reverse Output Current

30105fc

TYPICAL APPLICATIONS

5V Buck Converter with Low Current Keep Alive Backup

LT3010/LT3010-5

D2

D1N914

V

IN

5.5V*
TO 60V

OPERATING

CURRENT

HIGH

LOW

C3

4.7μF
100V
CERAMIC

6

BOOST

4

V

IN

15

SHDN

14

SYNC

GND

1, 8, 9, 16

8

5

SHDN

LT1766

LT3010-5

GND

4

SW

BIAS

V

C

OUTIN

SENSE

FB

11

C
1nF

C2

0.33μF

2

D1
10MQ060N

10

12

C

1

2

†

L1

15μH

R1

15.4k

R2

4.99k

*

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

+

C1
100μF 10V
SOLID
TANTALUM

30105 TA03

V

OUT

5V
1A/50mA

Buck Converter

Effi ciency vs Load Current

100

90

80

= 5V

V

OUT

L = 68μH

VIN = 10V

VIN = 42V

70

EFFICIENCY (%)

60

50

0

0.25 0.50 0.75
LOAD CURRENT (A)

1.00

1.25

30105 TA04

30105fc

13

LT3010/LT3010-5

TYPICAL APPLICATIONS

LT3010 Automotive Application

V

IN

12V

(LATER 42V)

OFF

ON

V

OFF

48V

ON

(72V TRANSIENT)

OUTIN

LT3010-5

SENSE

GND

+

1μF

NO PROTECTION

DIODE NEEDED!

SHDN

LT3010 Telecom Application

IN

1μF

SHDN

LT3010-5

GND

OUTIN

SENSE

NO PROTECTION

DIODE NEEDED!

1μF

Constant Brightness for Indicator LED over Wide Input Voltage Range

1μF

LOAD: CLOCK,

SECURITY SYSTEM

SYSTEM MONITOR

ETC

LOAD:

ETC

30105 TA05

+

BACKUP
BATTERY

–

RETURN

1μF

OFF ON

–48V

I

= 1.275V/R

LED

–48V CAN VARY FROM –4V TO –80V

SET

IN

LT3010

SHDN

GND

OUT

ADJ

R

SET

30105 TA06

1μF

14

30105fc

PACKAGE DESCRIPTION

2.794 ± 0.102
(.110 ± .004)

MS8E Package

8-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1662)

EXPOSED PAD OPTION

0.889 ± 0.127
(.035 ± .005)

BOTTOM VIEW OF

1

LT3010/LT3010-5

2.06 ± 0.102
(.081 ± .004)

1.83 ± 0.102

(.072 ± .004)

5.23

(.206)

MIN

0.42 ± 0.038

(.0165 ± .0015)

TYP

RECOMMENDED SOLDER PAD LAYOUT

0.254
(.010)

GAUGE PLANE

0.18

(.007)

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

2.083 ± 0.102

(.082 ± .004)

0.65

(.0256)

BSC

DETAIL “A”

0° – 6° TYP

DETAIL “A”

3.20 – 3.45

(.126 – .136)

0.53 ± 0.152

(.021 ± .006)

SEATING

PLANE

3.00 ± 0.102

(.118 ± .004)

(NOTE 3)

4.90 ± 0.152
(.193 ± .006)

(.043)

0.22 – 0.38

(.009 – .015)

TYP

1.10

MAX

8

8

12

0.65

(.0256)

BSC

7

0.52

5

4

(.0205)

REF

3.00 ± 0.102

(.118 ± .004)

(NOTE 4)

0.86

(.034)

REF

0.1016 ± 0.0508
(.004 ± .002)

MSOP (MS8E) 0307 REV D

6

3

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.

30105fc

15

LT3010/LT3010-5

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VIN: 3.6V to 25V, V

VIN: 7.4V to 60V, V

Low Noise < 20μV

: 1.8V to 20V, V

IN

Low Noise < 20μV

: 1.8V to 20V, V

IN

Low Noise < 20μV

: 2.7V to 20V, V

IN

Low Noise < 40μV

OUT

OUT

OUT

RMS

OUT

RMS

OUT

RMS

OUT

RMS

DD, TO220-5 Packages
VIN: 5.5V to 60V, V

VIN: 7.4V to 40V, V

OUT

OUT

90% Effi ciency, VIN: 3.2V to 34V, V
ThinSOT Package

VIN: 5.5V to 60V, V

Low Noise < 20μV

: 2.1V to 20V, V

IN

Low Noise < 40μV

OUT

OUT

RMS

OUT

RMS

DD, TO220-5, S0T-223, S8 Packages

Low Noise < 30μV

RMS

= 2.5V, VDO = 0.4V, IQ = 40μA, ISD = 40μA, Comparator and

= 2.5V, VDO = 0.4V, IQ = 40μA, ISD = 10μA, Comparator and

= 3.75V, VDO = 0.42V, IQ = 30μA, ISD = 16μA, Reverse

OUT

= 3.75V, VDO = 0.4V, IQ = 50μA, ISD = 16μA, DD, S0T-223, S8,

= 1.25V, IQ = 1.9mA, ISD = <1μA, ThinSOT™ Package

= 1.24V, IQ = 3.2mA, ISD = 2.5μA, S8 Package

= 1.22V, VDO = 0.3V, IQ = 20μA, ISD = <1μA,

, Stable with 1μF Ceramic Capacitors, ThinSOT Package

= 1.22V, VDO = 0.3V, IQ = 25μA, ISD = <1μA,

, MS8 Package

= 1.22V, VDO = 0.3V, IQ = 30μA, ISD = <1μA,

, S8 Package

= 1.21V, VDO = 0.34V, IQ = 1mA, ISD = <1μA,

, “A” Version Stable with Ceramic Capacitors,

= 1.20V, IQ = 2.5mA, ISD = 25μA, TSSOP16/E Package

= 1.24V, IQ = 3.2mA, ISD = 30μA, N8, S8 Packages

= 1.25V, IQ = 14μA, ISD = <1μA,

OUT

= 1.20V, IQ = 2.5mA, ISD = 25μA, TSSOP16/E Package

= 1.22V, VDO = 0.27V, IQ = 30μA, ISD = <1μA,

, MS8 Package

= 1.21V, VDO = 0.34V, IQ = 1mA, ISD = <1μA,

, “A” Version Stable with Ceramic Capacitors,

= –1.21V, VDO = 0.34V, IQ = 30μA, ISD = 3μA,

OUT

, Stable with Ceramic Capacitors, ThinSOT Package

16

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LT 0208 REV C • PRINTED IN USA

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