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零件编号 | 8205 | ||
描述 | LOW-DROPOUT REGULATORS . HIGH EFFICIENCY | ||
制造商 | Allegro MicroSystems | ||
LOGO | |||
1 Page
8205
PRELIMINARY INFORMATION
(subject to change without notice)
December 6, 1999
LOW-DROPOUT REGULATORS
— 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
54
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
VR
DUCT Y1 2
3
PRO ONLDwg.PS-021-5
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
APPLICATIONS
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”
ing pages.
is the required output voltage in tenths or “ADJ” for adjustable.
8205
LOW-DROPOUT
REGULATORS
The products described here are manufactured under one or more
U.S. patents or U.S. patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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页数 | 8 页 | ||
下载 | [ 8205.PDF 数据手册 ] |
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