Allegro A8182SL Datasheet

8182

PRELIMINARY INFORMATION DATA SHEET

LOW-DROPOUT,

(Subject to change without notice)

3 V REGULATOR

November 14, 1994

Data Sheet

27468.2

8182

LOW-DROPOUT, 3 V REGULATOR

— HIGH EFFICIENCY

Designed specifically to meet the requirement for extended opera­tion of battery-powered equipment such as cordless and cellular
telephones, the A8182SL 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 3 V output at up to 150 mA.

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
and RESET output gives the designer complete control over power up,
standby, or power down.

This device is supplied in an 8-lead small-outline plastic package
(SOIC) for surface-mount applications. The A8182SL is rated for
operation over a temperature range of -20°C to +85°C.

OUT

ENABLE

GND

1

IN

2

3

4

3 V

VR

8

OUT

7

IN

6

COMP

RESET

5

Dwg. PS-020

FEATURES AND BENEFITS

ABSOLUTE MAXIMUM RATINGS

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

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

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

Reset Output Voltage, VOR. . . . . . . . V

Reset Output Current, IOR. . . . 1.0 mA

Operating Temperature Range,

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

DISCONTINUED PRODUCT

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

TS. . . . . . . . . . . . -40°C to +150°C

— FOR REFERENCE ONLY

* 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.

I
I

†

■ High Efficiency Provides Extended Battery Life

■ 85 mV Typical Dropout Voltage at IO = 60 mA

■ 46 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: A8182SL .

8182

72813

5

4

6

LOW-DROPOUT,
3 V REGULATOR

FUNCTIONAL BLOCK DIAGRAM

IN
IN

ERROR

AMP

BANDGAP

REF.

ENABLE

ENABLE

BIAS

THERMAL

PROTECT.

DRIVE

For proper operation, terminals 1 and 8 should be externally connected together,
terminals 2 and 7 should be externally connected together.

1.23 V

OUT
OUT

COMP

–

RESET

+

GND

Dwg. FS-012-2

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 150 150 150 150 150 150 150 150 150
50°C 150 150 150 150 150 150 150 150 150
70°C 145 150 150 150 150 150 150 150 150
85°C 120 130 150 150 150 150 150 150 150

*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)/(5 • 108 • dc)

θJA

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

W
Copyright © 1994 Allegro MicroSystems, Inc.

8182

LOW-DROPOUT,
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

O

VO

O(∆VI)

O(∆IO)

4 V ≤ VI ≤ 8 V, TA = +25°C 2.95 3.00 3.05 V
10 µA ≤ I

= 3 V, IO = 60 mA, -20°C ≤ TA ≤ +85°C 2.70 — — V

V

I

≤ 100 mA -20°C ≤ TA ≤ +85°C 2.90 3.00 3.10 V

O

VI = 6 V, IO = 10 mA — — ±0.5 mV/°C
6 V ≤ VI ≤ 8 V, IO = 1 mA — 7.0 14 mV
4 V ≤ V

≤ 6 V, IO = 1 mA — 5.5 11 mV

I

1 mA ≤ IO ≤ 100 mA, VI = 8 V — 12 30 mV
1 mA ≤ I
1 mA ≤ I

≤ 100 mA, VI = 6 V — 11 25 mV

O

≤ 100 mA, VI = 4 V — 8.0 20 mV

O

Dropout Voltage VImin - VOIO = 60 mA — 85 150 mV

= 125 mA* — 175 TBD mV

I

O

Quiescent Current I

Q

VI = 6 V, 1 mA ≤ IO ≤ 100 mA, VE ≥ 2.0 V — 46 60 µA

(GND terminal current) VI = 8 V, 1 mA ≤ IO ≤ 100 mA, VE ≥ 2.0 V — 50 65 µA

I

ENABLE Input Voltage V

ENABLE Input Current I
COMP Threshold Voltage V
COMP Threshold Volt. TC α
COMP Threshold Hys. V
COMP Input Current I
COMP Input Current TC α
RESET Leakage Current I
RESET Output Voltage V
Thermal Shutdown Temp. T
Thermal Resistance R

Q(off)

EH

V

EL

E

C(t)

VC

C(hys)

C

IC

OR

OR

J

θJA

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
4 V ≤ VI ≤ 8 V, VC increasing from 0 1.20 1.23 1.30 V
4 V ≤ VI ≤ 8 V — — ±0.5 mV/°C
4 V ≤ VI ≤ 8 V 12 34 50 mV
0 V ≤ VC ≤ V

O

4 V ≤ VI ≤ 8 V — -0.5 -2.5 nA/°C
VOR = VI = 10 V, TA = +85°C — — 2.0 µA
IOR = 500 µA — 100 400 mV

Mounted on 2.24" x 2.24" solder-coated — 108 — °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 (≤50 ms). See previous page for duty cycle limitations.

— -25 TBD nA

150 — — °C