Datasheet LM2931Z-90, LM2931Z-85, LM2931Z-33, LM2931Z-15, LM2931Z-10 Datasheet (Bay Linear)

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com

100mA Low Dropout Voltage Regulator

LM2931

Pin Connection

Ordering Information

8SOIC (M)

Package Tolerance

SOT-89

LM2931R-XX

TO-92

LM2931Z-XX

8-SOIC

LM2931M-XX

“XX” Voltage Selection Guide

Vout XX Code

3.3V

33

5.0V

50

8.0V

80

8.5V

85

9.0V

90

10.0V

10

12.0V

12

15.0V

15

Adjustable

Left Blank

Description

The Bay Linear LM2931 are low power voltage regulators designed for a wide range of applications. They are an excellent choice for use in Battery Powered applications. The LM2931 feature low quiescent current (100 µA Typ.) and low dropout of only 60mV at light loads and 300mV (typ.) at 100mA. The LM2931 has tight initial tolerance of 0.5% typ., extremely good load and line regulation of 0.05% typ. and very low output temperature coefficient.

The Bay Linear LM2931 is available as a fixed voltage regulator and as an adjustable regulator in TO-92 and 8SOIC packages. The Bay Linear LM2931 in an 8SOIC package has an adjustable output voltage from 3V to 24V, programmed with a pair of external resistor. The logic compatible shutdown enables the regulator to be switched ON and OFF.

Features

•

Guaranteed 100mA Output

•

Fixed Versions 3.3V, 50.V, 8.0

•

Very Low Quiescent Current

•

Low Dropout Voltage

•

Extremely Tight Load and Line Regulation

•

Very Low Temperature Coefficient

•

Current and Thermal Limiting

•

Reverse Battery Protection of –20V

•

Transient protection of 60V

•

Output programmable from 3V to 24V

Applications

• Battery Powered Systems

• Portable instrumentation

• Notebooks Computers

• Potable Consumer Equipment

• Automotive electronics

• SMPS Post-Regulator

Bay Linear

Bay LinearBay Linear

Bay Linear

Linear Excellenc e

1

2

4

3

5

6

7

8

Output

Input

GND

Feedback

Shutdown

SOT-89

Front View

INPUT

GND

OUTPUT

BAY

LM2931

OUTPUT

GROUND

INPUT

13

2

TO-92

Bott om View

SOT-89

Front View

INPUT

GND

OUTPUT

BAY

LM2931

SOT-89

Front View

INPUT

GND

OUTPUT

BAY

LM2931

OUTPUT

GROUND

INPUT

13

2

TO-92

Bott om View

OUTPUT

GROUND

INPUT

13

2

TO-92

Bott om View

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com

LM2931

Absolute Maximum Rating

Parameter

Power Dissipation Internally Limited Lead Temperature ( Soldering 5 seconds )

260 °C

Storage Temperature Range

-65 °C to +150 °C

Operating Junction Temperature

-55 °C to +150 °C

Input Supply Voltage -20 to +35V

Electrical Characteristics

TJ = 25°C , IO = 100µA, VIN = 14V ( for 2931-15 VIN = 16V), CO = 100µF; unless otherwise specified)

Parameter Conditions MIN TYP MAX UNIT

Output Voltage (Fixed Version)

-25 °C ≤ T

j

≤

85 °C

Full Operating Temperature

0.985 [ V

o

]

0.98 [ V

o

]

V

o

1.015 [ Vo ]

1.02 [ V

o

]

V

Output Voltage (Fixed Versi on)

100µA ≤ I

L

≤

100mA, T

j

≤ T

jmax

0.975 [Vo ] Vo 1.025 [ Vo ]

V

Input Supply Voltage 26 V Output Voltage Temperature

Coefficient

(Note 1) 50 150

ppm / ° C

Line Regulation (Note 2)

13V ≤ V

IN

≤ 26V (Note 3)

0.1 0.4 %

Load Regulation (Note 2)

100µA ≤ I

L

≤

100mA

0.1 0.3 %

Dropout Voltage (Note 4)

I

L

= 100µA

IL = 100mA

60

300

200 600

mV

Ground Current (Note 5)

I

L

= 100µA IL = 10mA I

L

= 100mA

100

0.9 8

150

1.5 12

µ

A mA mA

Dropout Ground Current

V

IN

= (V

OUT

– 0.5V), IL = 100µA

110 170

µ

A

Current Limit V

OUT

= 0 160 200 mA Thermal Regulation (Note 6) 0.05 0.2 % / W Output Noise, 10Hz to 100KHz I

L

= 10mA

C

L

= 2.2µF

C

L

= 3.3µF

C

L

= 33µF

500

350 120

µ

Vrms

Ripple Rejection Ratio

I

O

= 10mA, f = 120Hz, C0 = 100µF

VIN = VO + 3V+2Vpp

60 dB

8 pin Versions only (LP2951)

Reference Voltage

Over Temperature (Note 7)

1.21

1.185

1.235 1.26

1.285

V

Feedback Pin Bias Current 20 40

η

A Reference Voltage Temperature Coefficient

(Note 1) 50

ppm/°C

Feedback Pin Bias Current Temperature Coefficient

0.1

ηA/°

C

Shutdown Input

Input Logic Vol tage Low (Regulator ON)

High (Regulator OFF)

2

1.3 0.7 V

Shutdown Pin Input Current VS = 2.4V

VS = 26V

30

450

50

600

µ

A

Regulator Output Current in Shutdown

(Note 8)

5.0V ≤ V

OUT

≤

15.0V

3.3V ≤ V

OUT

≤

5.0V

2.0V ≤ V

OUT

≤

3.3V

10 20 30

µ

A

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com

LM2931

Note 1:

Output or reference voltage temperature coefficient s defined as the worst case voltage change di vided by the total temperature range.

Note 2:

Unless otherwise sp ecified all limits guaranteed for T

J

= 25°C, VIN = VO +1V, IL = 100µA and CL = 1µF. Additional conditions for the 8-

pin versions are feedback tied to –XX Voltage tap and output tied to output Sense pin ( V

OUT

= XX V) and V

SHUTDOWN

≤ 0.8V

Note 2:

Regulation is meas ured at constant junction temperat ure , using pulse testing with a low dut y cycle. Changes in output voltage due to

heating effects are covered under sp ecification for therm al regulation.

Note 3:

Line regulation for is tested at 150°C for I

L

= 1mA. For IL = 100µA and TJ = 125°C, line regulation is guaranteed by design to 0.2%. for

B2931-15 16V ≤ V

IN

≤ 26V.

Note 4:

Dropout voltage is defined as the input to output differentia l at which the output voltage drops 2% below i ts 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 regulati on is the change in output voltage at a time T af ter a change in power dissipation, exclu ding load or line regulation

effects. Specifications are for a 50 mA load pulse (1.25W) for T = 10ms.

Note 7:

V

REF

≤ V

OUT

≤ (V

IN

–1V), 2.3V ≤ VIN ≤ 26V, 100µA ≤ IL ≤100mA, T

J

≤ T

JMAX

Note 8:

V

SHUTDOWN

≥ 2V, VIN ≤ 26V, V

OUT

= 0

Application Hints

The LM2931 requires an output capacitor for device stability. The value required varies greatly depending upon the application circuit and other factors. The high frequency characteristics of electrolytic capacitors depend greatly on the type and also on the manufacturer. Sometimes only bench testing is the only means to determine the proper capacitor type and value. The high quality 100 µF aluminum electrolytic covers all general application circuits, this stability can be o btained with a ta ntal u m electrolytic value of 47 µF.

Another critical point of electrolytic characteristics is its performance over temperature. The LM2931 is designed to operate starting at -40°C which may not be true in the case of electrolytic. Higher temperatures generally no problem. The electrolytic. type in aluminum will freeze around -30°C. This could cause an oscillation at output of regulator. At a lower temperature requirement by many applications the capacitor should maintain its performance. So as a result, for an application which regulator junction temperature does not exceed 25°C, the output capacitor can be reduced by the

factor of two over the value needed for the entire temperature range.

Other points with linear regulators are that the twitch higher output current stability

decreases. In most applications the LM2931 is operating at few milliamps. In these applications the output capacitance can be further reduced. For example, when the regulator is running at 10mA output current the output capacitance value is half compared to the same regulator that is running at 100 mA. With the LM2931 adjustable regulator, the minimum value of output capacitance is a function of the output voltage. The value decreases with higher output voltages, since the internal loop gain is reduced.

The worst case occurs at the lower temperature and maximum operating currents, the entire circuit and the electrolytic, should be cooled down to the minimum temperature. The minimum of 0.6 volts required at the input of regulator above the output to keep the power dissipation and die heating to its minimum. After the value for the capacitor has been determined for actual use, the value should be doubled.

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com

LM2931

TYPICAL CHARACTERISTICS

INPUT OUTPUT DIFFERENTIAL (V)

0.6

0.5

0.2

0

JUNCTION TEMPERATURE (ºC)

QUIESCENT CURRENT (mA)

25

3

2

0

-40 0 80 120

JUNCTION TEMPERATURE (ºC)

0.4

0.3

0.1

0

40 80 120

DROPOUT VOLTAGE

QUIESCENT CURRENT

6.0

3.0

2.0

1.0

2.0 3.0 4.0 5.0 6.0

INPUT VOLTAGE (V)

LOW VOLTAGE BEHAVIOR

OUTPUT VOLTAGE (V)

1.0

0.8

0.6

0.5

0 5 10 15 20 25 30

AMBIENT TEMPERATURE (ºC)

MAXIMUM POWER DISSIPATION (SO-

8)

POWER DISSIPATION (W)

0.9

0.7

0.4

10

1

0.1

0 30 60 90 120 150

FREQUENCY (Hz)

MAXIMUM POWER DISSIPATION

OUTPUT IMPEDANCE (

Ω)

Ω)Ω)

Ω)

0.01

INPUT OUTPUT DIFFERENTIAL (V)

0.4

0.2

OUTPUT CURRENT (mA)

QUIESCENT CURRENT (mA)

0

OUTPUT CURRENT (mA)

0.3

0.1

0

DROPOUT VOLTAGE

QUIESCENT CURRENT

22 20

6

0

0102040 70 80 100

AMBIENT TEMPERATURE (ºC)

MAXIMUM POWER DISSIPATION (TO-220)

POWER DISSIPATION (W)

REFERENCE VOLTAGE (V)

1.10 18 21

OUTPUT VOLTAGE (V)

REFERENCE VOLTAGE

OUTPUT CURRENT (mA)

800

500

0

INPUT VOLTAGE (V)

200

100

10 20

PEAK OUTPUT CURRENT

1.0

020405060

AMBIENT TEMPERATURE (ºC)

MAXIMUM POWER DISSIPATION (TO-92)

POWER DISSIPATION (W)

30 60 90

5

10

15

20

25

30

0 50 100

1.12

1.18

1.22

1.26

1.30

912

300

400

0.9

0.8

0.7

0.6

0.5

0.4

OPERATION DURING LOAD DUMP

TIME (ms)

OUTPUT

VOLTAGE (V)

400

200

100-100

30

10

0

6 4

-2

10

15

20

15

30

18

2 0

0 300

1

~

40

IO = 0mA

IO = 50mA

VIN = 14V

24630

1.14

1.16

1.24

1.20

1.28

LM2931CT ADJUSTABLE

IO = 100mA

IO = 50mA

IO = 10mA

0.5

0.6

0

TJ = 25ºC

TJ = 85ºC

TJ = -40ºC

4.0

5.0

LM2931 5.0 IO = 100 mA

INFINITE HEAT SINK

10 ºC/W HEAT SINK

NO HEAT SINK

14

16

12 10

8

4 2

30 50 60 90

0.1

0.3

0.2

0

10 30 70 80 90

0.125" LEAD LENGTH FROM PC BOARD

0.4" LENGTH

FROMPC BOARD

LM2931-

5.0

I

O

= 10mA

0.3

0.2

0.1 0

~

20

40

50

60

70

500

OUTPUT

VOLTAGE (V)

~

CO = 100µF R

L

= 500W

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com

LM2931

TYPICAL APPLICATIONS

LM2931 ADJUSTABLE OUTPUT

LM2931

ADJ.

LM2931 ADJUSTABLE OUTPUT

LM2931

ADJ.

LM2931

LM2931 Fixed Output

LM2931

LM2931 Fixed Output

SCHEMATIC DIAGRAM

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com

LM2931

PACKAGE DRAWING

TO-92(Z)

1

2

3

0.055 (1.397)

0.045 (1.143)

0.145 (3.683)

0.135 (3.429)

10° typ.

BOTTOM VIEW

0.185 (4.699)

0.045 (1.143)

0.185 (4.699)

0.175 (4.445)

0.085 (2.159) Diameter

0.090 (2.286) typ.

Seating Plane

0.016 (0.406)

0.014 (0.356)

0.055 (1.397)

0.045 (1.143)

0.105 (2.667)

0.095 (2.413)

0.500 (12.70) Min.

0.025 (0.635) Max Uncontrolled Lead Diameter

5° typ.

0.090 (2.286) Radius typ.

0.0155 (0.3937)

0.0145 (0.3683)

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com

LM2931

PACKAGE DRAWING

SO-8(M)

Pin 1

1.27 (0.50) BSC

3.8 (0.150)

4.0 (0.158)

4.6 (0.181)

5.2 (0.205)

5.8 (0.228)

6.2 (0.244)

4.8 (0.188)

5.0 (0.197)

0.49 (0.019)

0.56 (0.022)

0.35 (0.014)

0.45 (0.018)

0.10 (0.004)

0.20 (0.008)

0.19 (0.007)

0.22 (0.009)

1.35 (0.053)

1.75 (0.069)

0.61 (0.024)

0.78 (0.031)

3°-6

°

0.64 (0.025)

0.77 (0.030)

45

°

7°(4 PLCS)

7

°

(4 PLCS)

0.37 (0.015) BSC

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com

LM2931

PACKAGE DRAWING

SOT-89®

Advance Information

-

These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations,

computer simulations and/ or initial prototype evaluation.

Preliminary Information

-

These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are

subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges.

The application circuit exa mples are only to explain the representative applications of the devices and are not intended to gu arantee any circuit design or permit an y in dustrial property right to other rights to execute. Bay Linear takes no responsibility for any problems related to any industrial property right resulting from the use of the conten ts shown in the data book. Typical parameters can and do vary in different applications. Customer’s technical experts must validate all operating parameters including “ Typical” for each customer application.

LIFE SUPPORT AND NUCLEAR POLICY

Bay Linear products are not authorized for and should not be used within life support systems which are intended for surgical implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility application s without the specific written consent of Bay Linear President.

A

1

2

3

P

K

F

G

D

B

STYLE 1

PIN 1. BASE

2. COLLECTOR

3. EMITTER

STYLE 3

PIN 1. GATE

2. ANODE

3. CATHODE

STYLE 2

PIN 1. ANODE

2. CATHODE

3. NO CONNECTION

PIN 1. DRAIN

2. GATE

3. SOURCE

STYLE 4

MILLIMETERS INCHES

DIM

MIN MAX MIN MAX A 4.40 4.60 0.174 0.181 B 2.29 2.60 0.091 0.102 C 140 160 0.056 0.062 D 0.36 0.48 0.015 0.018 E 1.62 1.80 0.064 0.070

F 0.44 0.53 0.018 0.020

G

J 0.35 0.44 0.014 0.017

K 0.80 1.04 0.032 0.040

L 300 BSC 0.118 BSC N 2.04 2.28 0.081 0.089 P 3.94 4.25 0.156 0.167

150 BSC 0.059 BSC

-T-

N

C

J