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8181

LOW-DROPOUT,

5 V REGULATOR

8181

LOW-DROPOUT, 5 V REGULATOR

— HIGH EFFICIENCY

Especially suited for hand-held, portable, battery-operated equip-

ment such as cellular telephones, the A8181SLB low dropout voltage

regulator provides high efficiency for maximum battery life in a mini-

mum package size. Equally applicable to camcorders and portable

computers, the device provides a fixed 5 V regulated continuous output

at almost 200 mA of load current under worst-case conditions. Under

normal operating conditions, output currents over 500 mA are

permitted.

A MOSFET pass element delivers high output current with an

input-output differential of less than 300 mV. For high efficiency, the

low dropout voltage allows a longer battery discharge before output

voltage regulation is lost. A low quiescent current, even during high

load conditions, makes the device ideal for standby power systems.

High regulator accuracy and excellent temperature characteristics are

provided by a bandgap reference. An enable input gives the designer

complete control over sequential power-up or emergency shutdown.

This device is supplied in a 16-lead wide-body, small-outline

plastic power package (SOIC) for surface-mount applications. The

copper batwing provides for maximum package power dissipation in

the smallest possible construction. The A8181SLB is rated for opera-

tion over a temperature range of -20°C to +85°C.

Data Sheet

27468*

GROUND

ENABLE

ABSOLUTE MAXIMUM RATINGS

at T

A

= +25°C

Input Voltage, V

I

...................................

10 V

Output Current, I

O

(40% duty cycle) ............................

1 A*

(75% duty cycle) .....................

500 mA*

(continuous) ............................

370 mA*

Operating Temperature Range,

T

A

.................................

-20

°

C to +85

°

C

Junction Temperature, T

J

..............

+150

°

C†

Storage Temperature Range,

T

S

...............................

-40

°

C to +150

°

C

* Output current rating is limited by input voltage,

duty cycle, and ambient temperature. Under any

set of conditions, do not exceed a junction

temperature of +150°C. See next page.

† Fault conditions that produce excessive

junction temperature will activate device thermal

shutdown circuitry. These conditions can be

tolerated but should be avoided.

T

C

U Y

D L

O N

R O

P E

D C

E N

U E

N ER

I

T F

N E

O R

C R

S O

I

D F

—

NC

1

2

3

4

5

16

15

14

13

12

11

10

9

OUT

NC

5V

GROUND

NC

6

7

VR

IN

8

Dwg. PS-018

FEATURES AND BENEFITS

s

High Efficiency Provides Extended Battery Life

Less Than 300 mV Dropout Voltage

Low Quiescent Current

>200 mA Output Current

LSTTL-Compatible ON/OFF Control

For Sequential Power-up or Emergency Shutdown

s

Internal Thermal Protection

s

SOIC Surface-Mount Package

Always order by complete part number:

A8181SLB

.

8181

LOW-DROPOUT,

5 V REGULATOR

FUNCTIONAL BLOCK DIAGRAM

IN

7

8

15

16

OUT

BIAS

DRIVE

ERROR

AMP

ENABLE

6

THERMAL

PROTECT.

ENABLE

BANDGAP

REF.

12-13

4-5

Dwg. FS-012

MAXIMUM ALLOWABLE OUTPUT CURRENT with device mounted on 2.24" x 2.24"

(56.9 mm x 56.9 mm) solder-coated copper-clad board in still air.

Maximum Allowable Output Current in Milliamperes with V

I

= 10 V, T

J

= 150°C*

dc (Duty Cycle)

T

A

25°C

50°C

70°C

85°C

100%

370

295

235

190

90%

415

330

265

215

80%

465

370

295

240

70%

530

425

340

275

60%

620

495

395

320

50%

745

595

475

385

40%

930

745

595

485

30%

1000

995

795

645

20%

1000

970

* I

O

= (T

J

- T

A

)/([V

I

- V

O

] R

θJA

• dc) = (150 - T

A

)/(5 • 67 • dc)

Output current rating can be increased (to 1 A maximum) by heat sinking or reducing the input voltage. With an infinite heat sink, R

-JA

= R

-JT

=

6°C/W. Conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated

but should be avoided.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

W

8181

LOW-DROPOUT,

5 V REGULATOR

ELECTRICAL CHARACTERISTICS at T

A

+25°C (unless otherwise noted).

Limits

Characteristic

Output Voltage

Symbol

V

O

Test Conditions

T

A

= 25°C, 5.5 V

≤

V

I

≤

10 V,

0 mA

≤

I

O

≤

500 mA†

T

A

= 85°C, 5.5 V

≤

V

I

≤

10 V,

0 mA

≤

I

O

≤

500 mA*†

Output Volt. Temp. Coeff.

Line Regulation

Load Regulation

Dropout Voltage

Quiescent Current

(GND terminal current)

α

VO

∆V

O(∆VI)

∆V

O(∆IO)

V

I

min - V

O

I

Q

I

O

= 0

5.5 V

≤

V

I

≤

10 V, Output open

0 mA

≤

I

O

≤

500 mA†, V

I

= 6 V

I

O

= 500 mA†

V

I

= 10 V, I

O

= 500 mA†

V

I

= 10 V, Output open

I

Q(off)

ENABLE Input Voltage

V

EH

V

EL

ENABLE Input Current

Thermal Shutdown Temp.

Thermal Resistance

I

E

T

J

R

θJA

R

θJT

Typical values are given for circuit design information only.

* This parameter is tested to a lot sample plan only.

† Pulse test (<20 ms).

Min.

4.90

Typ.

5.00

Max.

5.10

Units

V

4.85

—

±100

10

40

—

87

86

—

165

67

5.15

V

µV/°C

mV

µA

V

µA

°C

°C/W

—

2.4

—

30

100

300

120

20

—

0.4

±0.1

—

V

I

= 10 V, Output open, V

E

= 0.4 V

Output ON, V

I

= 10 V

Output OFF, V

I

= 10 V

V

E

= V

I

= 10 V

Mounted on 2.24" x 2.24" solder-coated

copper-clad board in still air

—

6.0

—

8181

LOW-DROPOUT,

5 V REGULATOR

TYPICAL CHARACTERISTICS

LOAD REGULATION

5.06

LINE REGULATION

5.06

5.04

OUTPUT VOLTAGE, V

O

in VOLTS

5.02

OUTPUT VOLTAGE, V

O

in VOLTS

V

I

= 10 V

V

I

= 8 V

V

I

= 7 V

T

A

= -20°C

100 mA INTERVALS

5.02

I

O

= 0 mA

5.00

4.98

V

I

= 6 V

V = 5.5 V

I

4.98

I

O

= 500 mA

4.96

4.94

T

A

= -20°C

4.94

4.92

0

100

200

300

400

500

OUTPUT CURRENT, I

O

in mA

Dwg. GP-039

4.92

5.0

6.0

7.0

8.0

9.0

10

INPUT VOLTAGE, V

I

in VOLTS

Dwg. GP-040

5.06

5.04

V

I

= 10 V

V

I

= 8 V

V

I

= 7 V

OUTPUT VOLTAGE, V

O

in VOLTS

T

A

= 25°C

100 mA INTERVALS

OUTPUT VOLTAGE, V

O

in VOLTS

5.02

I

O

= 0 mA

5.00

4.98

I

O

= 500 mA

4.96

V

I

= 6 V

V

I

= 5.5 V

4.96

4.94

T

A

= 25°C

4.94

4.92

0

100

200

300

400

500

OUTPUT CURRENT, I

O

in mA

Dwg. GP-039-1

4.92

5.0

6.0

7.0

8.0

9.0

10

INPUT VOLTAGE, V

I

in VOLTS

Dwg. GP-040-1

CAUTION:

Maximum allowable duty cycle will be significantly less than 100% at high temperatures, at high input voltages, or at high output

currents. See Maximum Allowable Output Current table.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

8181

LOW-DROPOUT,

5 V REGULATOR

TYPICAL CHARACTERISTICS (cont’d)

LOAD REGULATION

5.06

LINE REGULATION

5.04

T

A

= 85°C

5.04

T

A

= 85°C

100 mA INTERVALS

OUTPUT VOLTAGE, V

O

in VOLTS

5.02

V

I

= 10 V

V

I

= 8 V

V

I

= 7 V

OUTPUT VOLTAGE, V

O

in VOLTS

5.02

I

O

= 0 mA

5.00

4.98

4.96

V

I

= 6 V

V = 5.5 V

I

4.96

I

O

= 500 mA

4.94

4.92

0

100

200

300

400

500

OUTPUT CURRENT, I

O

in mA

Dwg. GP-039-2

4.92

5.0

6.0

7.0

8.0

9.0

10

INPUT VOLTAGE, V

I

in VOLTS

Dwg. GP-040-2

DROPOUT VOLTAGE

0.5

OUTPUT VOLTAGE vs TEMP.

0.4

OUTPUT VOLTAGE, V

O

in VOLTS

DROPOUT VOLTAGE in VOLTS

VI = 6 V

0.3

T

A

= 85°C

T

A

= 25°C

T

A

= -20°C

5.01

I O = 0 mA

5.00

4.99

0.2

4.98

0.1

0

100

200

300

400

500

-50

0

+50

+100

OUTPUT CURRENT, I

O

in mA

Dwg. GP-041

AMBIENT TEMPERATURE, T

A

in

°C

Dwg. GP-036

CAUTION:

Maximum allowable duty cycle will be significantly less than 100% at high temperatures, at high input voltages, or at high output

currents. See Maximum Allowable Output Current table.

8181

8181概述

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