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8181
LOW-DROPOUT,
5 V REGULATOR
8181
LOW-DROPOUT, 5 V REGULATOR
— HIGH EFFICIENCY
Especially suited for hand-held, portable, battery-operated equip-
TNC 1
16 OUT
CNC 2
NC 3
U YGROUND 4
15 OUT
14 NC
13 GROUND
D LGROUND 5
12 GROUND
O NENABLE 6 VR 11 NC
R OIN 7
10 NC
PIN 8
9 NC
D CEDwg.PS-018
TINUEERENABSOLUTE MAXIMUM RATINGS
Fat TA = +25°C
NInput Voltage, VI ................................... 10 V
EOutput Current, IO
O(40% duty cycle) ............................ 1 A*
R(75% duty cycle) ..................... 500 mA*
C(continuous) ............................ 370 mA*
S ROperating Temperature Range,
TA ................................. -20°C to +85°C
I OJunction Temperature, TJ .............. +150°C†
Storage Temperature Range,
D FTS ............................... -40°C to +150°C
* Output current rating is limited by input voltage,
duty cycle, and ambient temperature. Under any
ment such as cellular telephones, the A8181SLB low dropout voltage
regulator provides high efficiency for maximum battery life in a mini-
mum package size. Equally applicable to camcorders and portable
computers, the device provides a fixed 5 V regulated continuous output
at almost 200 mA of load current under worst-case conditions. Under
normal operating conditions, output currents over 500 mA are
permitted.
A MOSFET pass element delivers high output current with an
input-output differential of less than 300 mV. For high efficiency, the
low dropout voltage allows a longer battery discharge before output
voltage regulation is lost. A low quiescent current, even during high
load conditions, makes the device ideal for standby power systems.
High regulator accuracy and excellent temperature characteristics are
provided by a bandgap reference. An enable input gives the designer
complete control over sequential power-up or emergency shutdown.
This device is supplied in a 16-lead wide-body, small-outline
plastic power package (SOIC) for surface-mount applications. The
copper batwing provides for maximum package power dissipation in
the smallest possible construction. The A8181SLB is rated for opera-
tion over a temperature range of -20°C to +85°C.
FEATURES AND BENEFITS
s High Efficiency Provides Extended Battery Life
s Less Than 300 mV Dropout Voltage
s Low Quiescent Current
s >200 mA Output Current
s LSTTL-Compatible ON/OFF Control
For Sequential Power-up or Emergency Shutdown
s Internal Thermal Protection
s SOIC Surface-Mount Package
set of conditions, do not exceed a junction
temperature of +150°C. See next page.
† Fault conditions that produce excessive
junction temperature will activate device thermal
shutdown circuitry. These conditions can be
tolerated but should be avoided.
Always order by complete part number: A8181SLB .

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8181
LOW-DROPOUT,
5 V REGULATOR
IN 7
IN 8
FUNCTIONAL BLOCK DIAGRAM
15 OUT
16 OUT
ENABLE 6
BIAS
12-13
DRIVE
ERROR
AMP
BANDGAP
REF.
4-5
Dwg. FS-012
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.
Maximum Allowable Output Current in Milliamperes with VI = 10 V, TJ = 150°C*
dc (Duty Cycle)
TA
100%
90%
80%
70%
60%
50%
40%
30%
20%
25°C
370
415
465
530
620
745
930
1000
1000
50°C
295
330
370
425
495
595
745
995 1000
70°C
235
265
295
340
395
475
595
795 1000
85°C
190
215
240
275
320
385
485
645
970
* IO = (TJ - TA)/([VI - VO] RθJA • dc) = (150 - TA)/(5 • 67 • dc)
Output current rating can be increased (to 1 A maximum) by heat sinking or reducing the input voltage. With an infinite heat sink, R-JA = R-JT =
6°C/W. Conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated
but should be avoided.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1992, 1995 Allegro MicroSystems, Inc.

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8181
LOW-DROPOUT,
5 V REGULATOR
ELECTRICAL CHARACTERISTICS at TA +25°C (unless otherwise noted).
Limits
Characteristic
Symbol Test Conditions
Min.
Typ.
Max.
Output Voltage
Output Volt. Temp. Coeff.
Line Regulation
Load Regulation
Dropout Voltage
Quiescent Current
(GND terminal current)
VO TA = 25°C, 5.5 V VI 10 V,
0 mA IO 500 mA†
TA = 85°C, 5.5 V VI 10 V,
0 mA IO 500 mA*†
αVO IO = 0
VO(VI) 5.5 V VI 10 V, Output open
VO(IO) 0 mA IO 500 mA†, VI = 6 V
VImin - VO IO = 500 mA†
IQ VI = 10 V, IO = 500 mA†
VI = 10 V, Output open
4.90
4.85
5.00
±100
10
40
87
86
5.10
5.15
30
100
300
120
120
ENABLE Input Voltage
ENABLE Input Current
Thermal Shutdown Temp.
Thermal Resistance
IQ(off)
VEH
VEL
IE
TJ
RθJA
VI = 10 V, Output open, VE = 0.4 V
Output ON, VI = 10 V
Output OFF, VI = 10 V
VE = VI = 10 V
Mounted on 2.24" x 2.24" solder-coated
copper-clad board in still air
2.4
— 20
——
— 0.4
±0.1
165 —
67 —
RθJT
— 6.0 —
Typical values are given for circuit design information only.
* This parameter is tested to a lot sample plan only.
† Pulse test (<20 ms).
Units
V
V
µV/°C
mV
mV
mV
µA
µA
µA
V
V
µA
°C
°C/W
°C/W

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8181
LOW-DROPOUT,
5 V REGULATOR
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
0
TYPICAL CHARACTERISTICS
LOAD REGULATION
LINE REGULATION
VI = 10 V
VI = 8 V
VI = 7 V
TA = -20°C
VI = 6 V
V = 5.5 V
I
100 200 300
OUTPUT CURRENT, IO in mA
400 500
Dwg. GP-039
5.06
5.04
5.02
TA = -20°C
100 mA INTERVALS
5.00
IO = 0 mA
4.98
IO = 500 mA
4.96
4.94
4.92
5.0
6.0 7.0 8.0
INPUT VOLTAGE, VI in VOLTS
9.0 10
Dwg. GP-040
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
0
VI = 10 V
VI = 8 V
VI = 7 V
TA= 25°C
VI = 6 V
VI = 5.5 V
100 200 300
OUTPUT CURRENT, IO in mA
400 500
Dwg. GP-039-1
5.06
5.04
5.02
TA = 25°C
100 mA INTERVALS
5.00
IO = 0 mA
4.98
4.96 IO = 500 mA
4.94
4.92
5.0
6.0 7.0 8.0
INPUT VOLTAGE, VI in VOLTS
9.0 10
Dwg. GP-040-1
CAUTION: Maximum allowable duty cycle will be significantly less than 100% at high temperatures, at high input voltages, or at high output
currents. See Maximum Allowable Output Current table.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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8181
LOW-DROPOUT,
5 V REGULATOR
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
0
0.5
0.4
0.3
0.2
0.1
0
0
TYPICAL CHARACTERISTICS (cont’d)
LOAD REGULATION
TA= 85°C
VI = 10 V
VI = 8 V
VI = 7 V
VI = 6 V
V = 5.5 V
I
100 200 300
OUTPUT CURRENT, IO in mA
400 500
Dwg. GP-039-2
LINE REGULATION
5.06
5.04
5.02
TA= 85°C
100 mA INTERVALS
5.00
IO = 0 mA
4.98
4.96
4.94
IO = 500 mA
4.92
5.0
6.0 7.0 8.0
INPUT VOLTAGE, VI in VOLTS
9.0 10
Dwg. GP-040-2
DROPOUT VOLTAGE
OUTPUT VOLTAGE vs TEMP.
TA = 85°C
TA = 25°C
TA = -20°C
5.01
5.00
4.99
4.98
VI = 6 V
IO = 0 mA
100 200 300
OUTPUT CURRENT, IO in mA
400
500
Dwg. GP-041
-50 0 +50
AMBIENT TEMPERATURE, TA in °C
+100
Dwg. GP-036
CAUTION: Maximum allowable duty cycle will be significantly less than 100% at high temperatures, at high input voltages, or at high output
currents. See Maximum Allowable Output Current table.