Allegro A8186SLU Datasheet

8186

LOW-DROPOUT,

3.3 V REGULATOR

Data Sheet

27468.14

8186

LOW-DROPOUT, 3.3 V REGULATOR

PRELIMINARY INFORMATION

(subject to change without notice)

January 12, 1995

OUT

6

3.3 V

VR

1

GND

5

SUB

2

SUB

SUB

SUB

IN

4

3

ENABLE

Dwg. PS-021-1

— HIGH EFFICIENCY

Designed specifically to meet the requirement for extended opera­tion 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 ap­proached, 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.

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.

FEATURES AND BENEFITS

■ High Efficiency Provides Extended Battery Life

ABSOLUTE MAXIMUM RATINGS

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

Output Current, IO. . . . . . . . . 150 mA*

Enable Input Voltage, VE. . . . . . . . . . V

DISCONTINUED PRODUCT

Operating Temperature Range,

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

Junction Temperature, TJ. . . +150°C
Storage Temperature Range,

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.

— FOR REFERENCE ONLY

I

†

■ 85 mV Typical Dropout Voltage at IO = 60 mA

■ 45 µA Typical Quiescent Current at VI = 6 V

Less Than 1 µA “Sleep” Current

■ Up to 150 mA Output Current

■ CMOS-Compatible ON/OFF Control

For Power-Up, Standby, or Shutdown

■ Internal Thermal Protection

■ Surface-Mount Package

APPLICATIONS

■ Cordless and Cellular Telephones

■ Personal Data Assistants

■ Personal Communicators

■ Palmtop Computers

Always order by complete part number: A8186SLU .

8186

4

6

3

2

1

5

LOW-DROPOUT,

3.3 V REGULATOR

FUNCTIONAL BLOCK DIAGRAM

IN

BIAS

ENABLE

ENABLE

THERMAL

PROTECT.

GND

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.

OUT

DRIVE

For proper operation, terminals 1 and 2 must be externally con­nected together.

ERROR

AMP

BANDGAP

REF.

Dwg. FS-012-3

SUB

SUB

SUB

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 = 8 V, TJ = 150°C, Period ≤10 s*

dc (Duty Cycle)

T

A

25°C 100 115 125 145 150 150 150 150 150
50°C 80 90 100 115 135 150 150 150 150
70°C 65 70 80 90 110 130 150 150 150
85°C 50 60 65 75 85 105 130 150 150

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

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.

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

• dc) = (150 - TA)/(4.7 • 258 • dc)

θJA

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

W
Copyright © 1995 Allegro MicroSystems, Inc.

8186

LOW-DROPOUT,

3.3 V REGULATOR

ELECTRICAL CHARACTERISTICS at T

= +25°C (unless otherwise noted).

A

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Output Voltage V

Output Volt. Temp. Coeff. α
Line Regulation ∆V

Load Regulation ∆V

Dropout Voltage V

Quiescent Current I

O

VO

O(∆VI)

O(∆IO)

min - VOIO = 60 mA* — 85 150 mV

I

Q

(GND terminal current) V

I

Q(off)

ENABLE Input Voltage V

ENABLE Input Current I
Thermal Shutdown Temp. T
Thermal Resistance R

EH

V

EL

E

J

θJA

4 V ≤ VI ≤ 8 V, TA = +25°C 3.25 3.30 3.35 V
10 µA ≤ I
V

= 3.3 V, IO = 60 mA*, -20°C ≤ TA ≤ +85°C 3.00 — — V

I

≤ 100 mA* -20°C ≤ TA ≤ +85°C 3.20 3.30 3.40 V

O

VI = 6 V, IO = 10 mA — — ±1.0 mV/°C
6 V ≤ VI ≤ 8 V, IO = 1 mA — 8.0 12 mV
4 V ≤ V

≤ 6 V, IO = 1 mA — 10 20 mV

I

1 mA ≤ IO ≤ 100 mA*, VI = 8 V — 20 30 mV
1 mA ≤ I
1 mA ≤ I

I

= 125 mA* — 190 300 mV

O

≤ 100 mA*, VI = 6 V — 13 25 mV

O

≤ 100 mA*, VI = 4 V — 8.0 20 mV

O

VI = 6 V, 1 mA ≤ IO ≤ 100 mA*, VE ≥ 2.0 V — 45 60 µA

= 8 V, 1 mA ≤ IO ≤ 100 mA*, VE ≥ 2.0 V — 50 65 µA

I

4 V ≤ VI ≤ 8 V, VE ≤ 0.8 V — 0.05 1.0 µA
4 V ≤ VI ≤ 8 V, Output ON 2.0 — — V

-20°C ≤ TA ≤ +85°C Output OFF — — 0.8 V
TA ≤ +85°C, VE = VI = 8 V — — ±0.1 µA

150 — — °C

Mounted on 2.24" x 2.24" solder-coated — 258 — °C/W
copper-clad board in still air

Typical values are at TA = +25°C and are given for circuit design information only.
* Pulse test (≤20 ms). See previous page for duty cycle limitations.