Datasheet A8181SLB Datasheet (Allegro)

8181

LOW-DROPOUT,
5 V REGULATOR

NC

1

2

NC

NC NC

GROUND

GROUND

ENABLE

3

4

512

6

IN

710

IN

89

5 V

VR

16

15

14

13

11

OUT

OUT

GROUND

GROUND

NC

NC

NC

8181

LOW-DROPOUT, 5 V REGULATOR

— HIGH EFFICIENCY

Especially suited for hand-held, portable, battery-operated equip­ment such as cellular telephones, the A8181SLB low dropout voltage
regulator provides high efficiency for maximum battery life in a mini­mum 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.

Data Sheet

27468*

Dwg. PS-018

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

FEATURES AND BENEFITS

ABSOLUTE MAXIMUM RATINGS

at T

= +25°C

Input Voltage, VI................................... 10 V

Output Current, I

(40% duty cycle)............................ 1 A*

(75% duty cycle)..................... 500 mA*

(continuous)............................ 370 mA*

Operating Temperature Range,

TA................................. -20°C to +85°C

Junction Temperature, T
Storage Temperature Range,

DISCONTINUED PRODUCT

TS............................... -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.

A

O

.............. +150°C†

J

— FOR REFERENCE ONLY

■ 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

■ Internal Thermal Protection

■ SOIC Surface-Mount Package

Always order by complete part number: A8181SLB .

8181

12-13

4-5

7815166

LOW-DROPOUT,
5 V REGULATOR

FUNCTIONAL BLOCK DIAGRAM

IN

IN

ENABLE

ENABLE

BIAS

THERMAL

PROTECT.

DRIVE

OUT
OUT

ERROR

AMP

BANDGAP

REF.

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 VI = 10 V, TJ = 150°C*

dc (Duty Cycle)

T

A

25°C 370 415 465 530 620 745 930 1000 1000
50°C 295 330 370 425 495 595 745 995 1000
70°C 235 265 295 340 395 475 595 795 1000
85°C 190 215 240 275 320 385 485 645 970

*IO = (TJ - TA)/([VI - VO] R

Output current rating can be increased (to 1 A maximum) by heat sinking or reducing the input voltage. With an infinite heat sink, R
6°C/W. Conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated
but should be avoided.

100% 90% 80% 70% 60% 50% 40% 30% 20%

• dc) = (150 - TA)/(5 • 67 • dc)

θJA

= R

-JT

=

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

W
Copyright © 1992, 1995 Allegro MicroSystems, Inc.

-JA

8181

LOW-DROPOUT,
5 V REGULATOR

ELECTRICAL CHARACTERISTICS at T

+25°C (unless otherwise noted).

A

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Output Voltage V

O

TA = 25°C, 5.5 V ≤ VI ≤ 10 V, 4.90 5.00 5.10 V
0 mA ≤ I

T

A

≤ 500 mA†

O

= 85°C, 5.5 V ≤ VI ≤ 10 V, 4.85 — 5.15 V

0 mA ≤ IO ≤ 500 mA*†
Output Volt. Temp. Coeff. α
Line Regulation ∆V
Load Regulation ∆V

VO

O(∆VI)

O(∆IO)

IO = 0 — ±100 — µV/°C

5.5 V ≤ VI ≤ 10 V, Output open — 10 30 mV

0 mA ≤ IO ≤ 500 mA†, VI = 6 V — 40 100 mV
Dropout Voltage VImin - VOIO = 500 mA† — — 300 mV
Quiescent Current I

(GND terminal current)

I

ENABLE Input Voltage V

Q

Q(off)

EH

V

EL

VI = 10 V, IO = 500 mA† — 87 120 µA

= 10 V, Output open — 86 120 µA

V

I

VI = 10 V, Output open, VE = 0.4 V — — 20 µA

Output ON, VI = 10 V 2.4 — — V

Output OFF, VI = 10 V — — 0.4 V
ENABLE Input Current I
Thermal Shutdown Temp. T
Thermal Resistance R

E

J

θJA

VE = VI = 10 V — — ±0.1 µA

Mounted on 2.24" x 2.24" solder-coated — 67 — °C/W

copper-clad board in still air

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).

— 165 — °C

— 6.0 — °C/W

8181

LOW-DROPOUT,
5 V REGULATOR

LOAD REGULATION LINE REGULATION

TYPICAL CHARACTERISTICS

5.06

5.04

5.02

in VOLTS

O

5.00

4.98

4.96

OUTPUT VOLTAGE, V

4.94

4.92

5.06

0

T = -20°C

100 200 400 500300

A

OUTPUT CURRENT, I

V = 10 V

I

V = 8 V

I

V = 7 V

I

V = 6 V

I

V = 5.5 V

I

O

in mA

Dwg. GP-039

5.06

5.04

5.02

in VOLTS

5.00

O

4.98

4.96

OUTPUT VOLTAGE, V

4.94

4.92

5.06

T = -20°C

A

100 mA INTERVALS

5.0

I = 0 mA

O

I = 500 mA

O

6.0 7.0 9.0

INPUT VOLTAGE, VI in VOLTS

8.0

10

Dwg. GP-040

5.04

5.02

in VOLTS

O

5.00

4.98

4.96

OUTPUT VOLTAGE, V

4.94

4.92
0

V = 6 V

V = 5.5 V

T = 25°C

A

100 200 400 500300

OUTPUT CURRENT, I

I

O

V = 10 V

I

V = 8 V

I

V = 7 V

I

I

in mA

Dwg. GP-039-1

5.04

5.02

in VOLTS

O

5.00

4.98

4.96

OUTPUT VOLTAGE, V

4.94

4.92

T = 25°C

A

100 mA INTERVALS

5.0

I = 0 mA

O

I = 500 mA

O

6.0 7.0 9.0

INPUT VOLTAGE, VI in VOLTS

8.0

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 [phone]

10

8181

LOW-DROPOUT,
5 V REGULATOR

LOAD REGULATION LINE REGULATION

TYPICAL CHARACTERISTICS (cont’d)

5.06

5.04

5.02

in VOLTS

5.00

O

4.98

4.96

OUTPUT VOLTAGE, V

4.94

4.92
0

0.5

5.06

5.04

5.02

in VOLTS

O

5.00

4.98

4.96

OUTPUT VOLTAGE, V

4.94

4.92

T = 85°C

A

100 mA INTERVALS

5.0

I = 0 mA

O

I = 500 mA

O

6.0 7.0 9.0

INPUT VOLTAGE, VI in VOLTS

8.0

Dwg. GP-040-2

V = 6 V

V = 5.5 V

I

100 200 400 500300

OUTPUT CURRENT, I

O

V = 10 V

I

V = 8 V

I

V = 7 V

I

I

in mA

T = 85°C

A

Dwg. GP-039-2

DROPOUT VOLTAGE OUTPUT VOLTAGE vs TEMP.

10

0.4

0.3

0.2

0.1

DROPOUT VOLTAGE in VOLTS

0

0

100 200 400 500300

OUTPUT CURRENT, I

T = 85°C

A

T = 25°C

A

T = -20°C

A

O in mA

Dwg. GP-041

5.01

in VOLTS

O

5.00

4.99

4.98

OUTPUT VOLTAGE, V

-50

0 +50

AMBIENT TEMPERATURE, T

V = 6 V

I

I = 0 mA

O

A

in °C

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.

+100

Dwg. GP-036

8181

LOW-DROPOUT,
5 V REGULATOR

QUIESCENT (GROUND TERMINAL) CURRENT

TYPICAL CHARACTERISTICS (cont’d)

81

80

79

V = 6 V

I

I = 0 mA

O

78

QUIESCENT (GROUND TERMINAL) CURRENT in µA

-50

0 +50

AMBIENT TEMPERATURE, T

A

in °C

+100

Dwg. GP-037

87

V = 10 V

86

85

84

83

82

81

QUIESCENT (GROUND TERMINAL) CURRENT in µA

80

0

100 200 400 500

OUTPUT CURRENT, I

I

V = 9 V

I

V = 8 V

I

V = 7 V

I

V = 6 V

I

300

O

in mA

T = 25°C

A

Dwg. GP-038

TRANSIENT PERFORMANCE

90

80

70

VI = 5.5 V to 10 V, TA = -20°C to +85°C, CO = 4.7 µF

5.5 V

60

T = 25°C

50

40

30

A

I = 0 mA

O

5.0 V

V

O

4.5 V
<100 µs

<500 µs

500 mA

I

O

20 mA

QUIESCENT (GROUND TERMINAL) CURRENT in µA

20

5.03.0

4.0

INPUT VOLTAGE, VI in VOLTS

6.0 7.0 9.0

8.0

10

Dwg. GP-042

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 [phone]

Dwg. WP-018

8181

LOW-DROPOUT,
5 V REGULATOR

Dimensions in Inches

(Based on 1 mm = 0.3937”)

0.2992

0.2914

0.020

0.013

0.0926

0.1043

16 9

1 2

0.0040 MIN.

3

0.4133

0.3977

Dimensions in Millimeters

16

0.0125

0.0091

0.419

0.394

0.050

0.016

0.050

BSC

9

0° TO 8°

Dwg. MA-008-17A in

0.32

0.23

7.60

7.40

0.51

0.33

2.65

2.35

NOTES: 1. Webbed lead frames. Leads 4, 5, 12, and 13 are internally one piece.

2. Lead spring tolerance is non-cumulative.

3. Exact body and lead configuration at vendor’s option within limits shown.

1

0.10

2

MIN.

3

10.50

10.10

1.27

BSC

10.65

10.00

0° TO 8°

1.27

0.40

Dwg. MA-008-17A mm

8181

LOW-DROPOUT,
5 V REGULATOR

Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from
the detail specifications as may be required to permit improvements in the design of its products.
Components made under military approvals will be in accordance with the approval requirements.

The information included herein is believed to be accurate and reliable. However, Allegro
MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other
rights of third parties which may result from its use.

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]