HIGH EFFICIENCY. 8205 Datasheet
LOW-DROPOUT REGULATORS . HIGH EFFICIENCY
|Total Page||8 Pages|
(subject to change without notice)
December 6, 1999
— HIGH EFFICIENCY
Designed specifically to meet the requirement for extended opera-
tion of battery-powered equipment such as cordless and cellular tele-
phones, 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
DUCT Y1 2
D E*NO CONNECTION (fixed regulators) or
E CADJUST (A8205SLH-ADJ only).
NTINUFERENABSOLUTE MAXIMUM RATINGS
CO REInput Voltage, VI . . . . . . . . . . . . . . . 7 V
Peak Output Current,
IS RIOM . . . . . . . . . . . . . . . . . . 200 mA*
Enable Input Voltage, VE . . . . . . . . . . VI
D OOperating Temperature Range,
FTA . . . . . . . . . . . . . -20°C to +85°C
Junction Temperature, TJ . . . . +150°C
Storage Temperature Range,
—TS . . . . . . . . . . . . -40°C to +150°C
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 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. 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 small-
outline 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
I High Efficiency Provides Extended Battery Life
I 75 mV Typical Dropout Voltage at IO = 100 mA
I 55 µA Typical Quiescent Current
Less Than 1 µA “Sleep” Current
I Low Output Noise
I 200 mA Peak Output Current
I Improved PSRR and Transient Performance
I Cordless and Cellular Telephones
I Personal Data Assistants
I Personal Communicators
I Palmtop Computers
* 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 follow-
Always order by complete part number, e.g., A8205SLH-xx , where “xx”
is the required output voltage in tenths or “ADJ” for adjustable.
FUNCTIONAL BLOCK DIAGRAM
4 (SUFFIX "-ADJ" ONLY)
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 - VO
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0* 4.5*
200 200 200 200 200 189 162 142 126
* Absolute maximum peak output current rating is 200 mA; absolute maximum input voltage is 7 V.
† IO = (TJ – TA)/([VI – VO] RθJA 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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1999, 2000 Allegro MicroSystems, Inc.
|Features||Datasheet pdf 8205 PRELIMINARY INFORMATION (subject to change without notice) December 6, 199 9 NC OR ADJ* OUT LOW-DROPOUT REGULATOR S — HIGH EFFICIENCY Designed specific ally to meet the requirement for extend ed operation of battery-powered equipme nt such as cordless and cellular teleph ones, the A8205SLH voltage regulators o ffer the reduced dropout voltage and qu iescent current essential for maximum b attery life. Applicable also to palmtop computers and personal data assistants , these devices deliver a regulated out put at up to 200 mA (transient), which is limited only by package power dissip ation. Regulated output voltages of 2.7 , 2.8, 3.0, 3.3, 3.6, 4.0, and 5.0 V ar e currently provided. Other voltages, d own to 2.0 volts, are available on spec ial order. A PMOS pass element provides a typical dropout voltage of only 75 m V at 100 mA of load current. The low dr opout voltage permits deeper battery di scharge before output regulation is los t. Quiescent current does not increase significantly as the dropo.|
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