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A8188SL Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer A8188SL
Beschreibung LOW-DROPOUT REGULATORS . HIGH EFFICIENCY
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 12 Seiten
A8188SL Datasheet, Funktion
8188
PRELIMINARY INFORMATION
(subject to change without notice)
July 13, 1999
LOW-DROPOUT REGULATORS
— HIGH EFFICIENCY
A8188SLT-xx
Designed specifically to meet the requirement for extended opera-
tion of battery-powered equipment such as cordless and cellular tele-
phones, the A8188S— voltage regulators offer the reduced dropout
voltage and quiescent current essential for maximum battery life.
Applicable also to palmtop computers and personal data assistants,
VR
DUCTLY1 2
3
PRO ONDwg.PS-022-2
D Ewhere “-xx” is the required output voltage in tenths
INUE ENCABSOLUTE MAXIMUM RATINGS
RInput Voltage, VI . . . . . . . . . . . . . . 10 V
T EPeak Output Current,
N FIOM . . . . . . . . . . . . . . . . . . 250 mA*
Enable Input Voltage, VE . . . . . . . . . VI
O EOperating Temperature Range,
C RTA .
Junction
............
Temperature, TJ
-20°C
....
to +85°C
+150°C
IS RStorage Temperature Range,
TS . . . . . . . . . . . . -40°C to +150°C
D FO* Output current rating is limited by input
these devices deliver a regulated output at up to 250 mA (transient),
which is limited only by package power dissipation. Regulated output
voltages between 2.5 V and 3.3 V are trimmed at wafer probe.
A PMOS pass element provides a typical dropout voltage of only
90 mV at 60 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 A8188SL-xx
includes ENABLE inputs to give the designer complete control over
power up, standby, or power down.
These devices are supplied, without the ENABLE function, in a
standard 3-lead SOT-89/TO-243AA small-outline plastic transistor
package (suffix ‘LT’). Dual regulators (A8188SL-xx) are provided in
an 8-lead SOIC package. 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 90 mV Typical Dropout Voltage at IO = 60 mA
I 55 µA Typical Quiescent Current
Less Than 1 µA “Sleep” Current
I 250 mA Peak Output Current
I Improved PSRR and Transient Performance
I Internal Thermal Protection
voltage, duty cycle, and ambient tempera-
ture. Under any set of conditions, do not
exceed a junction temperature of +150°C.
See following pages.
APPLICATIONS
I Cordless and Cellular Telephones
I Personal Data Assistants
I Personal Communicators
† Fault conditions that produce excessive
junction temperature will activate device
I Palmtop Computers
thermal shutdown circuitry. These condi-
tions can be tolerated but should be
avoided.
Always order by complete part number, e.g., A8188SLT-30 .






A8188SL Datasheet, Funktion
8188
LOW-DROPOUT
REGULATORS
TYPICAL CHARACTERISTICS (cont’d)
LOAD REGULATION
+0.06
+0.04
+0.02
VO(nom)
-0.02
VI = 7 V
VI = 6 V
-0.04
-0.06
TA = 85°C
-0.08
0
10 20 30 40
OUTPUT CURRENT in mA
VI = 4 V
50 60
Dwg. GP-052-15
+0.03
+0.02
+0.01
VO(nom)
-0.01
-0.02
-0.03
-0.04
2.0
LINE REGULATION
TA = 85°C
50 mA INTERVALS
IO = 0 mA
IO = 100 mA
3.0 4.0 5.0 6.0
INPUT VOLTAGE in VOLTS
7.0 8.0
Dwg. GP-053-15
OUTPUT VOLTAGE
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
V O(nom)
IO = 0 - 100 mA
TA = 25°C
+0.01
VO(nom)
-0.01
-0.02
VI = 6 V
IO = 0
1.0 2.0
3.0
INPUT VOLTAGE in VOLTS
4.0
Dwg. GP-059-2
-50 0 +50 +100
AMBIENT TEMPERATURE in °C
Dwg. GP-050-3
CAUTION: Maximum allowable duty cycle will be significantly less than 100% at high temperatures, at high input voltages, or at high output
currents. See appropriate Maximum Allowable Output Current table.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

6 Page









A8188SL pdf, datenblatt
8188
LOW-DROPOUT
REGULATORS
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 design of its products.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsibil-
ity for its use; nor for any infringements 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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