HIGH EFFICIENCY. 8188 Datasheet

8188 Datasheet PDF, Equivalent


Part Number

8188

Description

LOW-DROPOUT REGULATORS . HIGH EFFICIENCY

Manufacture

Allegro MicroSystems

Total Page 12 Pages
PDF Download
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8188 Datasheet
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 .

8188 Datasheet
8188
LOW-DROPOUT
REGULATORS
IN 8
FUNCTIONAL BLOCK DIAGRAM
(1/2 of A8188SL-xx shown)
1 OUT
ENABLE 7
BIAS
DRIVE
ERROR
AMP
BANDGAP
REF.
2 GND
Dwg. FS-012-8
Always order by complete part number:
Part Number Package
A8188SL-xx 8-Lead SOIC
A8188SLT-xx 3-Lead SOT-89/TO-243AA
RθJA
108°C/W
258°C/W
where “-xx” is the required output voltage (VO(nom)) in tenths
(25 through 33), e.g., -30 = 3.0 volts.
OUT1
GND1
OUT2
GND2
1
2
3
4
A8188SL-xx
8 IN1
VR
7 ENABLE1
6 IN2
VR
5 ENABLE2
Dwg. PS-023
NOTE — There is an indeterminate resistance between terminals
2 and 4. For proper operation, terminals 2 and 4 must be
externally connected together.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1999, 2000 Allegro MicroSystems, Inc.


Features Datasheet pdf 8188 PRELIMINARY INFORMATION (subject to change without notice) July 13, 1999 LOW-DROPOUT REGULATORS — HIGH EFFICIE NCY Designed specifically to meet the r equirement for extended operation of ba ttery-powered equipment such as cordles s and cellular telephones, the A8188S voltage regulators offer the reduced dropout voltage and quiescent current e ssential for maximum battery life. Appl icable also to palmtop computers and pe rsonal data assistants, these devices d eliver a regulated output at up to 250 mA (transient), which is limited only b y package power dissipation. Regulated output voltages between 2.5 V and 3.3 V are trimmed at wafer probe. A PMOS pas s element provides a typical dropout vo ltage of only 90 mV at 60 mA of load cu rrent. The low dropout voltage permits deeper battery discharge before output regulation is lost. Quiescent current d oes not increase significantly as the d ropout voltage is approached, an ideal feature in standby/resume power systems where data integrity is cru.
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