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8186

LOW-DROPOUT,

3.3 V REGULATOR

8186

LOW-DROPOUT, 3.3 V REGULATOR

— HIGH EFFICIENCY

Designed specifically to meet the requirement for extended opera-

tion of battery-powered equipment such as cordless and cellular

telephones, the A8186SLU voltage regulator offers the reduced dropout

voltage and quiescent current essential for maximum battery life.

Applicable also to palmtop computers and personal data assistants, the

device delivers a regulated, continuous 3.3 V output at up to 75 mA

under normal operating conditions, or to 150 mA (transient) under

worst-case conditions.

A PMOS pass element provides a typical dropout voltage of only

85 mV at 60 mA of load current. The low dropout voltage permits

deeper battery discharge before output regulation is lost. Furthermore,

quiescent current does not increase as the dropout voltage is ap-

proached, an ideal feature in standby/resume power systems where

data integrity is crucial. Regulator accuracy and excellent temperature

characteristics are provided by a bandgap reference. An ENABLE input

gives the designer complete control over power up, standby, or power

down.

Data Sheet

27468.14

PRELIMINARY INFORMATION

(subject to change without notice)

ABSOLUTE MAXIMUM RATINGS

Input Voltage, V

I

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

10 V

Output Current, I

O

. . . . . . . . .

150 mA*

Enable Input Voltage, V

E

. . . . . . . . . .

V

I

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

IN ER

T F

N E

O R

C R

IS O

D F

—

OUT

SUB

January 12, 1995

IN

6

5

4

3.3 V

SUB

VR

SUB

1

2

3

GND

ENABLE

SUB

This device is supplied in a 6-lead small-outline plastic package

(similar to the SOT-89/TO-243AA) for surface-mount applications. The

A8186SLU is rated for operation over a temperature range of -20°C to

+85°C.

Dwg. PS-021-1

FEATURES AND BENEFITS

s

High Efficiency Provides Extended Battery Life

s

85 mV Typical Dropout Voltage at I

O

= 60 mA

s

45

µA

Typical Quiescent Current at V

I

= 6 V

Less Than 1

µA

“Sleep” Current

s

Up to 150 mA Output Current

s

CMOS-Compatible ON/OFF Control

For Power-Up, Standby, or Shutdown

s

Internal Thermal Protection

s

Surface-Mount Package

APPLICATIONS

s

Cordless and Cellular Telephones

Personal Data Assistants

Personal Communicators

Palmtop Computers

A8186SLU

.

Always order by complete part number:

8186

LOW-DROPOUT,

3.3 V REGULATOR

FUNCTIONAL BLOCK DIAGRAM

IN

4

6

OUT

BIAS

DRIVE

ERROR

AMP

THERMAL

PROTECT.

ENABLE

3

BANDGAP

REF.

2

5

SUB

1

GND

SUB

Dwg. FS-012-3

Terminal numbering is in accordance with EIA/JEDEC convention.

Where EIAJ conventions apply, the tab is not numbered, resulting in

terminal 6 being designated terminal 5.

For proper operation, terminals 1 and 2 must be externally con-

nected together.

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

= 8 V, T

J

= 150°C, Period

≤10

s*

dc (Duty Cycle)

T

A

25°C

50°C

70°C

85°C

100%

100

80

65

50

90%

115

90

70

60

80%

125

100

80

65

70%

145

115

90

75

60%

150

135

110

85

50%

150

130

105

40%

150

130

30%

150

20%

150

* I

O

= (T

J

- T

A

)/([V

I

- V

O

] R

θJA

• dc) = (150 - T

A

)/(4.7 • 258 • dc)

Output current rating can be increased (to 150 mA maximum) by heat sinking or reducing the input voltage. 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

W

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

8186

LOW-DROPOUT,

3.3 V REGULATOR

ELECTRICAL CHARACTERISTICS at T

A

= +25

°

C (unless otherwise noted).

Limits

Characteristic

Output Voltage

Symbol

V

O

Test Conditions

4 V

≤

V

I

≤

8 V,

10

µA ≤

I

O

≤

100 mA*

T

A

= +25°C

-20°C

≤

T

A

≤

+85°C

Min.

3.25

3.20

3.00

—

2.0

—

150

Mounted on 2.24" x 2.24" solder-coated

copper-clad board in still air

—

Typ.

3.30

—

8.0

10

20

13

8.0

85

190

45

50

0.05

—

258

Max.

3.35

3.40

—

±1.0

12

20

30

25

20

150

300

60

65

1.0

—

0.8

±0.1

—

Units

V

mV/°C

mV

µA

V

µA

°C

°C/W

V

I

= 3.3 V, I

O

= 60 mA*, -20°C

≤

T

A

≤

+85°C

Output Volt. Temp. Coeff.

Line Regulation

α

VO

∆V

O(∆VI)

V

I

= 6 V, I

O

= 10 mA

6 V

≤

V

I

≤

8 V, I

O

= 1 mA

4 V

≤

V

I

≤

6 V, I

O

= 1 mA

Load Regulation

∆V

O(∆IO)

1 mA

≤

I

O

≤

100 mA*, V

I

= 8 V

1 mA

≤

I

O

≤

100 mA*, V

I

= 6 V

1 mA

≤

I

O

≤

100 mA*, V

I

= 4 V

Dropout Voltage

V

I

min - V

O

I

O

= 60 mA*

I

O

= 125 mA*

Quiescent Current

(GND terminal current)

I

Q(off)

ENABLE Input Voltage

V

EH

V

EL

ENABLE Input Current

Thermal Shutdown Temp.

Thermal Resistance

I

E

T

J

R

θJA

I

Q

V

I

= 6 V, 1 mA

≤

I

O

≤

100 mA*, V

E

≥

2.0 V

V

I

= 8 V, 1 mA

≤

I

O

≤

100 mA*, V

E

≥

2.0 V

4 V

≤

V

I

≤

8 V, V

E

≤

0.8 V

4 V

≤

V

I

≤

8 V,

-20°C

≤

T

A

≤

+85°C

Output ON

Output OFF

T

A

≤

+85°C, V

E

= V

I

= 8 V

Typical values are at T

A

= +25°C and are given for circuit design information only.

* Pulse test (≤20 ms). See previous page for duty cycle limitations.

8186

LOW-DROPOUT,

3.3 V REGULATOR

TYPICAL CHARACTERISTICS

LOAD REGULATION

LINE REGULATION

3.36

T

A

= -20°C

50 mA INTERVALS

3.34

OUTPUT VOLTAGE in VOLTS

3.32

V

I

= 8 V

3.30

V

I

= 6 V

3.32

I

O

= 0 mA

I

O

= 100 mA

3.30

3.28

V =4V

I

3.28

3.26

T

A

= -20°C

3.26

3.24

3.22

0

25

50

75

100

125

150

OUTPUT CURRENT in mA

Dwg. GP-052-6

3.22

2.0

3.0

4.0

5.0

6.0

7.0

8.0

INPUT VOLTAGE in VOLTS

Dwg. GP-053-6

3.36

T

A

= 25°C

50 mA INTERVALS

3.34

OUTPUT VOLTAGE in VOLTS

3.32

OUTPUT VOLTAGE in VOLTS

3.32

I

O

= 0 mA

3.30

V

I

= 8 V

3.30

3.28

V =4V

I

3.28

I

O

= 100 mA

3.26

T

A

= 25°C

2 V INTERVALS

3.26

3.24

3.22

0

25

50

75

100

125

150

OUTPUT CURRENT in mA

Dwg. GP-052-7

3.22

2.0

3.0

4.0

5.0

6.0

7.0

8.0

INPUT VOLTAGE in VOLTS

Dwg. GP-053-7

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

8186

LOW-DROPOUT,

3.3 V REGULATOR

TYPICAL CHARACTERISTICS (cont’d)

LOAD REGULATION

3.36

T

A

= 85°C

50 mA INTERVALS

LINE REGULATION

3.34

OUTPUT VOLTAGE in VOLTS

3.34

OUTPUT VOLTAGE in VOLTS

3.32

3.30

V =8V

I

3.30

I

O

= 0 mA

3.28

3.26

T

A

= 85°C

2 V INTERVALS

V

I

= 4 V

3.26

I

O

= 100 mA

3.24

3.22

0

25

50

75

100

125

150

OUTPUT CURRENT in mA

Dwg. GP-052-8

3.22

2.0

3.0

4.0

5.0

6.0

7.0

8.0

INPUT VOLTAGE in VOLTS

Dwg. GP-053-8

OUTPUT VOLTAGE

3.5

3.0

V

I

= 6 V

3.31

I

O

= 0

OUTPUT VOLTAGE in VOLTS

2.0

OUTPUT VOLTAGE in VOLTS

2.5

3.30

1.5

I

O

= 0 - 100 mA

T

A

= 25°C

3.29

1.0

3.28

0.5

0

1.0

2.0

3.0

INPUT VOLTAGE in VOLTS

4.0

-50

0

+50

+100

AMBIENT TEMPERATURE in

°C

Dwg. GP-059-1

Dwg. GP-050-2

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.

8186

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