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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 .

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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.

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8188
LOW-DROPOUT
REGULATORS
A8188SL-xx Maximum Allowable Total 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.
TA
25°C
Allowable Total Average (10 ms) Output Current in Milliamperes with TJ = 150°C, Duty Cycle = 100%†
VI - VO
1.0 1.5 2.0 2.5 3.0 4.0 5 .0 6.0 7.0*
500 500 500 460 385 285 230 190 165
50°C
500
500
460
370
305
230
185
150
130
70°C
500
490
370
295
245
185
145
120
105
85°C
500
400
300
240
200
150
120
100
85
* Absolute maximum peak output current rating for either output is 250 mA; absolute maximum input voltage is 10 V.
† IO = (TJ – TA)/([VI – VO] RθJA x dc) = (150 – TA)/([VI – VO] x 108 x 1.00)
Output current rating can be increased (to 250 mA maximum per output) by additional heat sinking or reducing the duty
cycle. Conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These
conditions can be tolerated but should be avoided.
A8188SLT-xx Maximum Allowable 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.
TA
25°C
Allowable Average (10 ms) Output Current in Milliamperes with TJ = 150°C, Duty Cycle = 100%†
VI - VO
1.0 1.5 2.0 2.5 3.0 4.0 5.0 6.0 7.0*
250 250 240 190 160 120
95
80
65
50°C
250
250
190
155
125
95
75
65
55
70°C
250
205
155
120
100
75
60
50
40
85°C
250
165
125
100
80
60
50
40
35
* Absolute maximum input voltage is 10 V.
† IO = (TJ – TA)/([VI – VO] RθJA x dc) = (150 – TA)/([VI – VO] x 258 x 1.00)
Output current rating can be increased (to 250 mA maximum) by additional heat sinking or reducing the duty cycle.
Conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions
can be tolerated but should be avoided.
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8188
LOW-DROPOUT
REGULATORS
ELECTRICAL CHARACTERISTICS at TA = +25°C (unless otherwise noted).
Limits
Characteristic
Symbol Test Conditions
Min. Typ. Max.
Output Voltage
(reference specified VO(nom))
VO
4 V VI 8 V, 10 µA IO 100 mA*
VI = VO(nom), IO = 60 mA
Output Volt. Temp. Coeff.
aVO VI = 6 V, IO = 10 mA, TJ 125°C
Line Regulation
VO(VI) 4 V VI 8 V, IO = 1 mA
Load Regulation
VO(IO) 1 mA IO 100 mA*, VI = 8 V
1 mA IO 100 mA*, VI = 6 V
1 mA IO 100 mA*, VI = 4 V
Dropout Voltage
VImin – VO IO = 60 mA
IO = 125 mA*
Quiescent Current
(GND terminal current)
IQ VI = 8 V, IO 1 mA, VE 2.0 V
VI = 8 V, IO 100 mA*, VE 2.0 V
VI = VO(nom), IO = 60 mA
IQ(off)
4 V VI 8 V, VE 0.8 V
ENABLE Input Voltage
VEH 4 V VI 8 V, Output ON
VEL 4 V VI 8 V, Output OFF
ENABLE Input Current
IE VE = VI = 8 V
Thermal Shutdown Temp.
TJ
Rejection Ratio
PSRR
VI = VO(nom) + 1.5 V, Vi = 100 mV, IO = 10 mA:
f = 1 kHz
-0.05
-0.30
2.0
150
0.00
-0.30
90
190
55
70
200
+0.05
10
40
40
40
150
300
70
85
1.0
0.8
±1.0
— 60
f = 10 kHz
– 50 —
Noise
en 10 Hz f 100 kHz, IO = 10 mA, CO = 10 µF — 2.0
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.
Units
V
V
mV/°C
mV
mV
mV
mV
mV
mV
µA
µA
µA
µA
V
V
µA
°C
dB
dB
µV/Hz
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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8188
LOW-DROPOUT
REGULATORS
TYPICAL CHARACTERISTICS
LOAD REGULATION
+0.06
+0.04
+0.02
VO(nom)
-0.02
VI = 8 V
-0.04
-0.06
TA = -20°C
VI = 6 V
V =4V
I
-0.08
0
25 50 75 100
OUTPUT CURRENT in mA
125 150
Dwg. GP-052-13
+0.03
+0.02
+0.01
VO(nom)
-0.01
-0.02
-0.03
-0.04
2.0
LINE REGULATION
TA = -20°C
50 mA INTERVALS
IO = 100 mA
IO = 0 mA
3.0 4.0 5.0 6.0
INPUT VOLTAGE in VOLTS
7.0 8.0
Dwg. GP-053-13
+0.06
+0.04
+0.02
VO(nom)
VI = 8 V
-0.02
-0.04
-0.06
TA = 25°C
2 V INTERVALS
V =4V
I
-0.08
0
25 50 75 100
OUTPUT CURRENT in mA
125 150
Dwg. GP-052-14
+0.03
+0.02
+0.01
VO(nom)
-0.01
-0.02
-0.03
-0.04
2.0
IO = 0 mA
TA = 25°C
50 mA INTERVALS
IO = 100 mA
3.0 4.0 5.0 6.0
INPUT VOLTAGE in VOLTS
7.0 8.0
Dwg. GP-053-14
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.
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