Allegro A8233SLM, A8230SLM, A8229SLM, A8228SLM, A8227SLM Datasheet

DISCONTINUED PRODUCT

— FOR REFERENCE ONLY

Designed specifically to meet the requirement for extended opera­tion of battery-powered equipment such as cordless and cellular tele­phones, the A8226SLM thru A8233SLM voltage regulators offer the
reduced dropout voltage and quiescent current essential for maximum
battery life. Applicable also to palmtop computers and personal data
assistants, these devices deliver a regulated output at up to 100 mA
(transient), which is limited only by package power dissipation. Regu­lated output voltages of 2.6, 2.7, 2.8, 2.9, 3.0 and 3.3 are currently
provided. Other voltages, down to 2.0 volts, are available on special
order.

A PMOS pass element provides a typical dropout voltage of only
125 mV at 50 mA of load current. The low dropout voltage permits
deeper battery discharge before output regulation is lost. Quiescent
current does not increase significantly 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. The A8226SLM
thru A8233SLM include ENABLE inputs to give the designer complete
control over power up, standby, or power down.

These devices are supplied in a thermally enhanced 5-lead small­outline plastic package similar to the SOT-23, and fitting the SC-74A
footprint. All devices are rated for operation over a temperature range
of -20°C to +85°C.

FEATURES AND BENEFITS

■ High Efficiency Provides Extended Battery Life

■ 125 mV Typical Dropout Voltage at IO = 50 mA

■ 32 µA Typical Quiescent Current

Less Than 1 µA “Sleep” Current

■ Low Output Noise

■ 100 mA Peak Output Current

■ Improved PSRR and Transient Performance

APPLICATIONS

■ Cordless and Cellular Telephones

■ Personal Data Assistants

■ Personal Communicators

■ Palmtop Computers

LOW-DROPOUT REGULATORS

— HIGH EFFICIENCY

Data Sheet

27468.10

8226

THRU

8233

PRELIMINARY INFORMATION

(subject to change without notice)

January 18, 2000

A82xxSLM

Always order by complete part number, e.g., A82xxSLM , where “xx” is
the required output voltage in tenths.

ABSOLUTE MAXIMUM RATINGS

Input Voltage, VI. . . . . . . . . . . . . . . 7 V

Peak Output Current,

IOM. . . . . . . . . . . . . . . . . . 100 mA*

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

I

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 follow­ing pages.

Dwg. PS-021-3

VR

2

GND

3

NO

CONNECT

1

ENABLE

5

IN

OUT

4

NC

8226

THRU

8233

LOW-DROPOUT
REGULATORS

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

FUNCTIONAL BLOCK DIAGRAM

Copyright © 2000, Allegro MicroSystems, Inc.

A82xxSLM Maximum Allowable Average 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.

Allowable Total Average (10 ms) Output Current in Milliamperes with TJ = 150°C, Duty Cycle = 100%†

VI - V

O

T

A

1.5 2.0 2.5 3.0 3.5 4.0* 4.5*

25°C 100 100 100 100 100 100 100

50°C 100 100 100 100 100 100 100

70°C 100 100 100 100 100 91 81

85°C 100 100 100 98 84 74 66

* Absolute maximum peak output current rating is 100 mA; absolute maximum input voltage is 7 V.

† IO = (TJ – TA)/([VI – VO] R

θJA

x dc) = (150 – TA)/([VI – VO] x 220 x 1.00)

Output current rating can be increased (to 100 mA maximum) by additional heat sinking or reducing the duty cycle.

Dwg. FS-012-5B

BIAS

DRIVE

ENABLE

BANDGAP

REF.

ERROR

AMP

IN

ENABLE

OUT

5 4

1

2

GND

8226

THRU

8233

LOW-DROPOUT

REGULATORS

www.allegromicro.com

ELECTRICAL CHARACTERISTICS at TA = +25°C, VE ≥ 2.0 V (unless otherwise noted).

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Output Voltage V

O

4 V ≤ VI ≤ 7 V, 10 µA ≤ IO ≤ 50 mA* -0.05 0.00 +0.05 V

(reference specified V

O(nom)

)

V

I

= V

O(nom)

, IO = 50 mA — — -0.25 V

Output Volt. Temp. Coeff. a

VO

VI = 6 V, IO = 10 mA, TJ ≤ 125°C — -0.20 — mV/°C

Line Regulation ∆V

O(∆VI)

4 V ≤ VI ≤ 7 V, IO = 1 mA — 3.0 10 mV

Load Regulation ∆V

O(∆IO)

1 mA ≤ IO ≤ 50 mA*, 4 V ≤ VI ≤ 7 V — — 20 mV

Dropout Voltage VImin - VOIO = 50 mA — 125 250 mV

Ground Terminal Current I

GND

VI < 7 V, IO ≤ 50 mA — 32 45 µA

I

Q

VI ≤ 7 V, VE ≤ 0.8 V, IO = 0 mA — — 1.0 µA

ENABLE Input Voltage V

EH

4 V ≤ VI ≤ 7 V, Output ON 2.0 — — V

V

EL

4 V ≤ VI ≤ 7 V, Output OFF — — 0.8 V

ENABLE Input Current I

E

VE = VI = 7 V — — ±1.0 µA

Rejection Ratio PSRR V

I

= V

O(nom)

+ 1.5 V, Vi = 100 mV, IO = 10 mA,
f = 1 kHz — 70 — dB
f = 10 kHz — 52 — dB

Output Noise e

n

10 Hz ≤ f ≤ 100 kHz, IO = 10 mA, CO = 10 µF — 0.5 — µV/√Hz

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.