Datasheet LND2931-9.0, LND2931-8.0, LND2931-5.0, LND2931-3.3, LND2931-15 Datasheet (Linear Dimensions)

DATA SHEET

LND2931

100mA Low Dropout Voltage Regulator

GENERAL DESCRIPTION

This series of fixed-voltage and adjustable
monolithic micropower voltage regulators is
designed for a wide range of applications. This
device is an excellent choice for use in battery­powered application. Furthermore, the
quiescent current increases only slightly at
dropout, which prolongs battery life. This series
of fixed-voltage ( Typ. 60mV at light load and
300mV at 100mV) includes a tight initial
tolerance of 0.5% typ., extremely good load and
line regulation of 0.05% typ., and very low output
temperature coefficient. This series of fixed­voltage and adjustable regulators is offered in 3­pin TO-92 package (TO-220-5, SO-8 for
LND2931) compatible with other fixed-voltage
regulators.

FEATURES

• 3- terminal regulators ( To-220-5, SO-8
for LND2931)

• 100mA output within 2% over
temperature

• Very low quiescent current

• Low dropout voltage (300mV Typ)

• Extremely tight load and line regulation

• Very low temperature coefficient

• Current and thermal limiting

• Unregulated DC input can withstand

–20V reverse battery and +60V positive
transients

• Direct replacement for National
LM2931 fixed series, but has lower
ground current, higher accuracy of
output voltage and extremely tight load
and line regulation. For adjust model
LND2931 see typical applications on
figure 2.

PIN CONFIGURATION

Output

GND

GND

Feedback

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1

2

LND2931

3

45

8

7

6

Input

GND

GND

Shutdown

APPLICATIONS

• High-efficiency linear regulators

• Battery powered systems

• Portable/Palm top/ Notebook

Computers

• Portable consumer equipment

• Portable instrumentation

• Automotive Electronics

• SMPS Post Regulator

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ABSOLUTE MAXIMUM RATINGS

Power Dissipation Internally Limited
Lead Temperature(Soldering, 5 seconds) 260ºC
Storage Temperature Range -65ºC to +150ºC
Operating Junction Temperature Range -55ºC to +150ºC

Input Supply Voltage -20V to +35V

DEVICE SELECTION GUIDE

Vout , VOLTS Device

3.3V* LND2931-3.3

5.0V LND2931-5.0

8.0V LND2931-8.0

8.5V LND2931-8.5

9.0V LND2931-9.0

10.0V LND2931-10

12.0V LND2931-12

15.0V LND2931-15

3.0v to 24V LND2931

LND2931

* Other fixed versions are also available, V

=2.0V to 5.0V. Please consult for more information.

OUT

OUTPUT

OUTPUT
GND
INPUT

TO-220

(Top View)

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TO-92
(Bottom View)

GND

INPUT

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ELECTRICAL CHARACTERISTICS

LND2931

(TJ =25ºC, IO =100µA, V

=14V (for 2931-15, V

IN

=16V), CO =100µF; unless otherwise noted)

IN

PARAMETER CONDITIONS MIN TYP MAX UNITS

Output Voltage
(Fixed Model)

Output Voltage
(Fixed Model)

-25º C≤T

≤

J

85ºC

Full Operating Temperature

100µA≤I

100mA, T

≤

L

Tjmax

≤

J

0.985 |V

0.98 |V

0.975 |V

|

O

|

O

|VO1.025 |VO|

O

V

O

1.015|VO|

1.02 |V

|

O

V

Input Supply Voltage 26
Output Voltage

Temperature Coefficient

Line Regulation (Note 2)

Load Regulation(Note 2)

Dropout Voltage(Note 4)

Ground Current (Note 5)

Dropout Ground Current
(Note 5)

Current Limit V

(Note 1) 50 150 ppm/ºC

13V ≤ Vin ≤ 26V (Note 3)

1mA≤ I
I

L

I

L

I

L

I

L

I

L

V

in=Vout

out

100mA

≤

L

=10mA
=100mA
=100µA
=10mA
=100mA

-0.5V , IL =100µA 110 170 µA

=0 160 200 mA

0.1 0.4 %

0.1 0.3 %

60
300
100

0.9
8

200
600
150

1.5
12

mV

µA
mA
mA

Thermal Regulation(Note6) 0.05 0.2 % / W

Output Noise, 10Hz to
100KHz I

= 100mA

L

Ripple Rejection Ratio

C

=2.2µF

L

=3.3µF

C

L

=33µF

C

L

I

=10mA,f=120Hz,Co=100µF,

O

Vin=V

+3V+2Vpp

o

60 dB

500
350
120

µV RMS

TO-220-5, SO-8 Versions Only

Reference Voltage 1.21 1.235 1.26
Reference Voltage Over Temperature (note 7) 1.185 1.285

V

Feedback Pin Bias Current 20 40 nA
Reference Voltage

Temperature Coefficient
Feedback Pin Bias Current

Temperature Coefficient

(Note 1) 50 ppm/ºC

0.1 nA/ºC

Shutdown Input

Input Logic Voltage

Shutdown Pin Input
Current

Low(Regulator ON)
High (Regulator OFF) 2
V

= 2.4V

S

= 26V

V

S

1.3 0.7

30

450

600

V

50

(Note 8)

Regulator Output Current
in Shutdown

5.0V ≤V

3.3V ≤V

2.0V ≤V

<15.0V

out

<5.0 V

out

<3.3V

out

10

20

30

µA

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LND2931

Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change
divided by the total temperature range.
Note 2: Regulations are measured at constant junction temperature, using pulse testing with a low duty
cycle. Changes in output voltage due to heating effects are covered under the specification for thermal
regulation.
Note 3: Line regulation is tested at 150ºC for I
guaranteed by design to 0.2%. For LND2931-15 16V<= Vin <=26V.
Note 4: Dropout voltage is defined as the input to output differential at which the output voltage drops 2%
below its nominal value measured at 1V differential.
Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is
the sum of the ground pin current and output load current.
Note 6: Thermal regulation is the change in output voltage at a time T after a change in power dissipation,
excluding load or line regulation effects. Specifications are for a 50mA load pulse (1.25W pulse) for
T=10ms.
Note7: Vref
Note 8: Vshutdown ≥ 2V, V

V

(Vin-1V), 2.3V≤Vin

≤

≤

out

26V, Vout =0V.

≤

IN

26V, 100µA ≤I

≤

BLOCK DIAGRAM AND TYPICAL APPLICATIONS

Figure 1: Fixed Regulator

Unregulated DC

= 1mA, for IL=100µA and T

L

100mA, T

≤

L

T

≤

J

125ºC, line regulation is

J =

jmax.

From
CMOS
or
TTL

+

5

SHUTDOWN

+

Unregulated DC

7

FEEDBACK

INPUT

+

­ERROR
AMPLIFIER

+

1.23 V
Reference

Figure 2:Adjustable Regulator

8

INPUT

+

­ERROR
AMPLIFIER

60k

182k

1

OUTPUT

60k

OUTPUT

GROUND

+

See
Application
Hints

R1

R2

5V

I <= 100mA

L

0.01 F

Vout 1.2A- >24A

I <= 100mA

L

µ

+

µ

3.3 F

+

1.23 V
Reference

2,3,6,7

GROUND

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TYPICAL APPLICATIONS

LND2931

+V

IN

8

ERROR IN

OUTPUT

5

ERROR

+V

IN

V

OUT

*V

1

OUT

LND2931

SHUTDOWN

INPUT

3

GND

4

*Minimum input-output voltage rang es from
40mV to 400mV, dependi ng on load current.
Current limit is typic ally 160mA.

FB

7

Wide Input Voltage Range Current Limiter

+V

IN

Ω

RESET

470k

470k

5

ERROR

Ω

3

SD

8

+V

IN

LND2931

GND

4

V

OUT

FB

1

7

R1

R2

5V BUS

+V

LND2931

IN

GND

*V

V

OUT

OUT

5V

1 F

+

µ

V

*Minimum input-output voltage ranges from
40mV to 400mV, depend ing on load current.
Current limit is typi cally 160mA.

5V Current Limiter

+V=

1.2 30V

I

I*VLOAD

L

V

V

OUT

+

µ

1 F

SHUTDOWN

INPUT

LND2931

3

SD

4

= 1.23/R

L

8

1%

1

V

OUT

FBGND

7

R

IN OUT

µ

1 F

+

µ

1 F

Latch Off When Error Flag Occurs Low Drift Current Source

• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel [phone] • fax [phone] •

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