DISCONTINUED PRODUCT
— FOR REFERENCE ONLY
8188
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,
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
■ High Efficiency Provides Extended Battery Life
■ 90 mV Typical Dropout Voltage at I
O
= 60 mA
■ 55 µA Typical Quiescent Current
Less Than 1
µA “Sleep” Current
■ 250 mA Peak Output Current
■ Improved PSRR and Transient Performance
■ Internal Thermal Protection
APPLICATIONS
■ Cordless and Cellular Telephones
■ Personal Data Assistants
■ Personal Communicators
■ Palmtop Computers
LOW-DROPOUT REGULATORS
— HIGH EFFICIENCY
Always order by complete part number, e.g., A8188SLT-30 .
A8188SLT-xx
PRELIMINARY INFORMATION
(subject to change without notice)
July 13, 1999
Dwg. PS-022-2
VR
2
3
1
GND
OUT
IN
where “-xx” is the required output voltage in tenths
Data Sheet
27468.8
ABSOLUTE MAXIMUM RATINGS
Input Voltage, V
I
. . . . . . . . . . . . . . 10 V
Peak Output Current,
I
OM
. . . . . . . . . . . . . . . . . . 250 mA*
Enable Input Voltage, V
E
. . . . . . . . . V
I
Operating Temperature Range,
T
A
. . . . . . . . . . . . . -20
°
C to +85
°
C
Junction Temperature, T
J
. . . . +150
°
C†
Storage Temperature Range,
T
S
. . . . . . . . . . . . -40
°
C to +150
°
C
* Output current rating is limited by input
voltage, duty cycle, and ambient tempera-
ture. Under any set of conditions, do not
exceed a junction temperature of +150
°C.
See following pages.
† Fault conditions that produce excessive
junction temperature will activate device
thermal shutdown circuitry. These condi-
tions can be tolerated but should be
avoided.
8188
LOW-DROPOUT
REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
FUNCTIONAL BLOCK DIAGRAM
(1/2 of A8188SL-xx shown)
Dwg. FS-012-8
BIAS
DRIVE
ENABLE
BANDGAP
REF.
ERROR
AMP
IN
ENABLE
OUT
8
1
7
2
GND
A8188SL-xx
1
2
3
Dwg. PS-023
6
7
8
GND
GND
OUT
OUT
ENABLE
IN
IN
ENABLE
1
1
2
2
VR
4
5
VR
1
1
2
2
Always order by complete part number:
Part Number
Package
R
θJA
A8188SL-xx
8-Lead SOIC
108
°C/W
A8188SLT-xx
3-Lead SOT-89/TO-243AA
258
°C/W
where “-xx” is the required output voltage (V
O(nom)
) in tenths
(25 through 33), e.g., -30 = 3.0 volts.
Copyright © 1999, 2000 Allegro MicroSystems, Inc.
NOTE — There is an indeterminate resistance between terminals
2 and 4. For proper operation, terminals 2 and 4 must be
externally connected together.
8188
LOW-DROPOUT
REGULATORS
www.allegromicro.com
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.
Allowable Total Average (10 ms) Output Current in Milliamperes with T
J
= 150
°C, Duty Cycle = 100%†
V
I
- V
O
T
A
1.0
1.5
2.0
2.5
3.0
4.0
5 .0
6.0
7.0*
25
°C
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.
† I
O
= (T
J
– T
A
)/([V
I
– V
O
] R
θJA
x dc) = (150 – T
A
)/([V
I
– V
O
] 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.
Allowable Average (10 ms) Output Current in Milliamperes with T
J
= 150
°C, Duty Cycle = 100%†
V
I
- V
O
T
A
1.0
1.5
2.0
2.5
3.0
4.0
5.0
6.0
7.0*
25
°C
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.
† I
O
= (T
J
– T
A
)/([V
I
– V
O
] R
θJA
x dc) = (150 – T
A
)/([V
I
– V
O
] 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.
8188
LOW-DROPOUT
REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
ELECTRICAL CHARACTERISTICS at T
A
= +25
°
C (unless otherwise noted).
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Output Voltage
V
O
4 V
≤ V
I
≤ 8 V, 10 µA ≤ I
O
≤ 100 mA*
-0.05
0.00
+0.05
V
(reference specified V
O(nom)
)
V
I
= V
O(nom)
, I
O
= 60 mA
-0.30
—
—
V
Output Volt. Temp. Coeff.
a
VO
V
I
= 6 V, I
O
= 10 mA, T
J
≤ 125°C
—
-0.30
—
mV/
°C
Line Regulation
∆V
O(
∆VI)
4 V
≤ V
I
≤ 8 V, I
O
= 1 mA
—
—
10
mV
Load Regulation
∆V
O(
∆IO)
1 mA
≤ I
O
≤ 100 mA*, V
I
= 8 V
—
—
40
mV
1 mA
≤ I
O
≤ 100 mA*, V
I
= 6 V
—
—
40
mV
1 mA
≤ I
O
≤ 100 mA*, V
I
= 4 V
—
—
40
mV
Dropout Voltage
V
I
min – V
O
I
O
= 60 mA
—
90
150
mV
I
O
= 125 mA*
—
190
300
mV
Quiescent Current
I
Q
V
I
= 8 V, I
O
≤ 1 mA, V
E
≥ 2.0 V
—
55
70
µA
(GND terminal current)
V
I
= 8 V, I
O
≤ 100 mA*, V
E
≥ 2.0 V
—
70
85
µA
V
I
= V
O(nom)
, I
O
= 60 mA
—
200
—
µA
I
Q(off)
4 V
≤ V
I
≤ 8 V, V
E
≤ 0.8 V
—
—
1.0
µA
ENABLE Input Voltage
V
EH
4 V
≤ V
I
≤ 8 V, Output ON
2.0
—
—
V
V
EL
4 V
≤ V
I
≤ 8 V, Output OFF
—
—
0.8
V
ENABLE Input Current
I
E
V
E
= V
I
= 8 V
—
—
±1.0
µA
Thermal Shutdown Temp.
T
J
150
—
—
°C
Rejection Ratio
PSRR
V
I
= V
O(nom)
+ 1.5 V, V
i
= 100 mV, I
O
= 10 mA:
f = 1 kHz
—
60
—
dB
f = 10 kHz
–
50
—
dB
Noise
e
n
10 Hz
≤ f ≤ 100 kHz, I
O
= 10 mA, C
O
= 10
µF
—
2.0
—
µV/√
Hz
Typical values are at T
A
= +25
°C and are given for circuit design information only.
* Pulse test (
≤20 ms). See previous page for duty cycle limitations.
8188
LOW-DROPOUT
REGULATORS
www.allegromicro.com
TYPICAL CHARACTERISTICS
LOAD REGULATION
LINE REGULATION
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.
0
OUTPUT CURRENT in mA
Dwg. GP-052-13
25
50
100
150
75
T = -20
°C
A
+0.04
V
O(nom)
+0.02
-0.02
OUTPUT VOLTAGE in VOLTS
-0.04
-0.06
+0.06
-0.08
125
V = 8 V
I
V = 4 V
I
V = 6 V
I
2.0
Dwg. GP-053-13
3.0
4.0
6.0
8.0
5.0
T = -20
°C
50 mA INTERVALS
A
I = 0 mA
O
INPUT VOLTAGE in VOLTS
I = 100 mA
O
7.0
+0.02
V
O(nom)
+0.01
-0.01
OUTPUT VOLTAGE in VOLTS
-0.02
-0.03
+0.03
-0.04
0
OUTPUT CURRENT in mA
Dwg. GP-052-14
25
50
100
150
75
T = 25
°C
2 V INTERVALS
A
125
V = 4 V
I
V = 8 V
I
+0.04
V
O(nom)
+0.02
-0.02
OUTPUT VOLTAGE in VOLTS
-0.04
-0.06
+0.06
-0.08
2.0
Dwg. GP-053-14
3.0
4.0
6.0
8.0
5.0
T = 25
°C
50 mA INTERVALS
A
I = 0 mA
O
INPUT VOLTAGE in VOLTS
7.0
I = 100 mA
O
+0.02
V
O(nom)
+0.01
-0.01
OUTPUT VOLTAGE in VOLTS
-0.02
-0.03
+0.03
-0.04
8188
LOW-DROPOUT
REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TYPICAL CHARACTERISTICS (cont’d)
LOAD REGULATION
LINE REGULATION
OUTPUT VOLTAGE
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.
0
OUTPUT CURRENT in mA
Dwg. GP-052-15
10
20
40
60
30
T = 85
°C
A
V = 4 V
I
V = 7 V
I
50
+0.04
V
O(nom)
+0.02
-0.02
OUTPUT VOLTAGE in VOLTS
-0.04
-0.06
+0.06
-0.08
V = 6 V
I
2.0
Dwg. GP-053-15
3.0
4.0
6.0
8.0
5.0
T = 85
°C
50 mA INTERVALS
A
I = 0 mA
O
INPUT VOLTAGE in VOLTS
7.0
I = 100 mA
O
+0.02
V
O(nom)
+0.01
-0.01
OUTPUT VOLTAGE in VOLTS
-0.02
-0.03
+0.03
-0.04
1.0
Dwg. GP-059-2
2.0
4.0
3.0
INPUT VOLTAGE in VOLTS
0
3.0
2.0
2.5
1.5
OUTPUT VOLTAGE in VOLTS
1.0
0.5
3.5
0
I = 0 - 100 mA
O
T = 25
°C
A
V
O(nom)
-50
AMBIENT TEMPERATURE in
°C
Dwg. GP-050-3
0
+50
+100
V = 6 V
I = 0
I
O
V
O(nom)
+0.01
-0.01
OUTPUT VOLTAGE in VOLTS
-0.02
8188
LOW-DROPOUT
REGULATORS
www.allegromicro.com
TYPICAL CHARACTERISTICS (cont’d)
QUIESCENT (GROUND TERMINAL) CURRENT
DROPOUT VOLTAGE
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.
-50
AMBIENT TEMPERATURE in
°C
Dwg. GP-051-3
55
0
+50
50
+100
45
QUIESCENT (GROUND TERMINAL) CURRENT in
µ
A
60
V = 6 V
I = 0
V
≥ 2 V
I
O
E
-2.0
Dwg. GP-058-1
+2.0
+4.0
INPUT VOLTAGE in VOLTS
0
200
150
QUIESCENT (GROUND TERMINAL) CURRENT in
µ
A
I = 0
O
250
100
50
T = 25
°C
A
V
O(nom)
+6.0
0
OUTPUT CURRENT in mA
Dwg. GP-054-2
25
50
100
150
75
T = -20
°C
T = 25
°C
T = 85
°C
A
A
A
0.15
0.20
0.10
DROPOUT VOLTAGE in VOLTS 0.05
0.25
0
125
8188
LOW-DROPOUT
REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TYPICAL CHARACTERISTICS (concluded)
LOAD TRANSIENT PERFORMANCE
V
I
= 3.2 V to 6.2 V, C
O
= 4.7
µF, T
A
= 25
°C
ENABLE TRANSIENT PERFORMANCE
V
I
= 3.2 V to 6.2 V, C
O
= 1
µF, T
A
= 25
°C
Dwg. WP-028-2
I
O
100 mA
1 mA
15
µs
5
µs
V
O(nom)
+0.1 V
-0.1 V
Dwg. WP-027-3
V
O
V
E
0
0
<100
µs
<150
µs
V
I
V
O(nom)
8188
LOW-DROPOUT
REGULATORS
www.allegromicro.com
A8188SL-xx
Dimensions in Inches
(for reference only)
NOTES: 1. Lead spacing tolerance is non-cumulative.
2. Exact body and lead configuration at vendor’s option within limits shown.
0
°
TO
8
°
0.1968
0.1890
0.2440
0.2284
0.050
0.016
Dwg. MA-007-8 in
0.050
BSC
0.0098
0.0075
8
1
0.1574
0.1497
0.020
0.013
0.0688
0.0532
0.0040
MIN.
Dimensions in Millimeters
(controlling dimensions)
0
°
TO
8
°
5.00
4.80
6.20
5.80
1.27
0.40
Dwg. MA-007-8 mm
1.27
BSC
0.25
0.19
8
1
4.00
3.80
0.51
0.33
1.75
1.35
0.10
MIN.
8188
LOW-DROPOUT
REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Dimensions in Millimeters
(controlling dimensions)
Dimensions in Inches
(for reference only)
A8188SLT-xx
NOTES: 1. Lead spacing tolerance is non-cumulative.
2. Exact body and lead configuration at vendor’s option within limits shown.
Dwg. MA-009-3 in
1
2
3
0.064
0.072
0.155
0.167
0.059
BSC
0.014
0.019
0.035
0.047
0.090
0.102
0.055
0.063
0.014
0.017
0.084
0.090
0.017
0.022
0.118
BSC
0.173
0.181
Dwg. MA-009-3 mm
1
2
3
4.40
4.60
1.62
1.83
3.94
4.25
1.50
BSC
0.36
0.48
0.89
1.20
2.29
2.60
1.40
1.60
0.35
0.44
2.13
2.29
0.44
0.56
3.00
BSC
8188
LOW-DROPOUT
REGULATORS
www.allegromicro.com
this page is intentionally left blank
8188
LOW-DROPOUT
REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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.
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