Allegro A8205SLH-4.0, A8205SLH-3.6, A8205SLH-3.3, A8205SLH-3.0, A8205SLH-2.8 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 A8205SLH 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 200 mA (transient),
which is limited only by package power dissipation. Regulated output
voltages of 2.7, 2.8, 3.0, 3.3, 3.6, 4.0, and 5.0 V 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
75 mV at 100 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 A8205SLH
includes an ENABLE input 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

■ 75 mV Typical Dropout Voltage at IO = 100 mA

■ 55 µA Typical Quiescent Current

Less Than 1 µA “Sleep” Current

■ Low Output Noise

■ 200 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

27468.20

Always order by complete part number, e.g., A8205SLH-xx , where “xx”
is the required output voltage in tenths or “ADJ” for adjustable.

ABSOLUTE MAXIMUM RATINGS

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

Peak Output Current,

IOM. . . . . . . . . . . . . . . . . . 200 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.

8205

Dwg. PS-021-5

VR

2

GND

3

NC

OR

ADJ*

1

ENABLE

5

IN

OUT

4

*NO CONNECTION (fixed regulators) or

ADJUST (A8205SLH-ADJ only).

PRELIMINARY INFORMATION

(subject to change without notice)

December 6

, 1999

8205

LOW-DROPOUT
REGULATORS

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

FUNCTIONAL BLOCK DIAGRAM

Copyright © 1999, 2000 Allegro MicroSystems, Inc.

A8205SLH 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

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0* 4.5*

25°C 200 200 200 200 200 189 162 142 126

50°C 200 200 200 200 182 152 130 114 101

70°C 200 200 200 182 145 121 104 91 81

85°C 200 200 197 148 118 98 84 74 66

* Absolute maximum peak output current rating is 200 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 200 mA maximum) by additional heat sinking or reducing the duty cycle.

DRIVE

BANDGAP

REF.

ERROR

AMP

Dwg. FS-012-6

BIAS

ENABLE

IN

ENABLE

OUT

1 5

3

2

GND

ADJUST

(SUFFIX "-ADJ" ONLY)
OTHERWISE

NO CONNECTION

(FIXED REG'S)

4

8205

LOW-DROPOUT

REGULATORS

www.allegromicro.com

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

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Output Voltage V

O

VI ≥ V

O(nom)

+ 1 V, 1 mA ≤ IO ≤ 150 mA*,

reference specified V

O(nom)

— 0.0 ±1.5 %

Output Volt. Temp. Coeff. a

VO

VI = 6 V, IO = 10 mA, TJ ≤ 125°C — 40 — ppm/°C

Line Regulation ∆V

O(∆VI)

V

O(nom)

+ 1 V ≤ VI ≤ 7 V, IO = 3 mA — — ±1.5 %

Load Regulation ∆V

O(∆IO)

VI = V

O(nom)

+ 1 V, 1 mA ≤ IO ≤ 150 mA* — — ±1.5 %

VI = 7 V, 1 mA ≤ IO ≤ 150 mA* — — ±1.5 %

Dropout Voltage VImin - VOIO = 100 mA — 75 200 mV

Ground Terminal Current I

GND

VI = V

O(nom)

+ 1 V, IO = 1 mA — 55 65 µA

VI = V

O(nom)

+ 1 V, IO = 150 mA* — 55 65 µA

VI = 7 V, IO = 1 mA — 55 65 µA

VI = 7 V, IO = 150 mA* — 55 65 µA

I

Q

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

ENABLE Input Voltage V

EH

VI ≥ V

O(nom)

+ 1 V, Output ON 2.0 — — V

V

EL

VI ≥ V

O(nom)

+ 1 V, Output OFF — — 0.4 V

ENABLE Input Current I

E

VE = VI = 7 V — — ±1.0 µA

Internal Reference Voltage V

REF

— 1.26 — V

ADJUST Input Current I

ADJ

A8205SLH-ADJ only — 0.10 — µA

Rejection Ratio PSRR V

I

= V

O(nom)

+ 1.5 V, Vi = 100 mV,

IO = 30 mA, f = 60 Hz — 70 — 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.