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8182
LOW-DROPOUT,PRELIMINARY INFORMATION DATA SHEET
(Subject to change without notice)
3NovVemRberE14G, 1U994LATOR
8182
LOW-DROPOUT, 3 V REGULATOR
— HIGH EFFICIENCY
Designed specifically to meet the requirement for extended opera-
UCT YOUT 1
D LIN 2
O NENABLE 3
ED PRNCE OGND 4
3V
VR
8 OUT
7 IN
6 COMP
5 RESET
Dwg. PS-020
tion of battery-powered equipment such as cordless and cellular
telephones, the A8182SL voltage regulator offers the reduced dropout
voltage and quiescent current essential for maximum battery life.
Applicable also to palmtop computers and personal data assistants, the
device delivers a regulated 3 V output at up to 150 mA.
A PMOS pass element provides a typical dropout voltage of only
85 mV at 60 mA of load current. The low dropout voltage permits
deeper battery discharge before output regulation is lost. Furthermore,
quiescent current does not increase as the dropout voltage is
approached, 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. An ENABLE input
and RESET output gives the designer complete control over power up,
standby, or power down.
This device is supplied in an 8-lead small-outline plastic package
(SOIC) for surface-mount applications. The A8182SL is rated for
operation over a temperature range of -20°C to +85°C.
TINU EREABSOLUTE MAXIMUM RATINGS
N FInput Voltage, VI . . . . . . . . . . . . . . 10 V
EOutput Current, IO . . . . . . . . . 150 mA*
O REnable Input Voltage, VE . . . . . . . . . . VI
CReset Output Voltage, VOR . . . . . . . . VI
S RReset Output Current, IOR . . . . 1.0 mA
IOperating Temperature Range,
OTA . . . . . . . . . . . . . -20°C to +85°C
D FJunction Temperature, TJ . . . +150°C
Storage Temperature Range,
TS . . . . . . . . . . . . -40°C to +150°C
FEATURES AND BENEFITS
s High Efficiency Provides Extended Battery Life
s 85 mV Typical Dropout Voltage at IO = 60 mA
s 46 µA Typical Quiescent Current at VI = 6 V
Less than 1 µA “Sleep” Current
s Up to 150 mA Output Current
s CMOS-Compatible ON/OFF Control
For Power-Up, Standby, or Shutdown
s Internal Thermal Protection
s Surface-Mount Package
APPLICATIONS
s Cordless and Cellular Telephones
* Output current rating is limited by input voltage,
duty cycle, and ambient temperature. Under any
set of conditions, do not exceed a junction temp-
erature 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.
s Personal Data Assistants
s Personal Communicators
s Palmtop Computers
Always order by complete part number: A8182SL .

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8182
LOW-DROPOUT,
3 V REGULATOR
IN 7
IN 2
ENABLE 3
FUNCTIONAL BLOCK DIAGRAM
BIAS
DRIVE
ERROR
AMP
BANDGAP
REF.
1.23 V
+
For proper operation, terminals 1 and 8 should be externally connected together,
terminals 2 and 7 should be externally connected together.
8 OUT
1 OUT
6 COMP
5 RESET
4 GND
Dwg. FS-012-2
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 = 8 V, TJ = 150°C, Period 10 s*
dc (Duty Cycle)
TA
100%
90%
80%
70%
60%
50%
40%
30%
20%
25°C
150
150
150
150
150
150
150
150
150
50°C
150
150
150
150
150
150
150
150
150
70°C
145
150
150
150
150
150
150
150
150
85°C
120
130
150
150
150
150
150
150
150
* IO = (TJ - TA)/([VI - VO] RθJA • dc) = (150 - TA)/(5 • 108 • dc)
Output current rating can be increased (to 150 mA maximum) by heat sinking or reducing the input voltage. 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 © 1994 Allegro MicroSystems, Inc.

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8182
LOW-DROPOUT,
3 V REGULATOR
ELECTRICAL CHARACTERISTICS at TA = +25°C (unless otherwise noted).
Limits
Characteristic
Symbol Test Conditions
Min.
Typ.
Max.
Output Voltage
VO 4 V VI 8 V,
TA = +25°C
10 µA IO 100 mA -20°C TA +85°C
VI = 3 V, IO = 60 mA, -20°C TA +85°C
Output Volt. Temp. Coeff.
αVO VI = 6 V, IO = 10 mA
Line Regulation
VO(VI)
6 V VI 8 V, IO = 1 mA
4 V VI 6 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
IQ VI = 6 V, 1 mA IO 100 mA, VE 2.0 V
(GND terminal current)
VI = 8 V, 1 mA IO 100 mA, VE 2.0 V
IQ(off)
4 V VI 8 V, VE 0.8 V
ENABLE Input Voltage
VEH 4 V VI 8 V,
Output ON
VEL -20°C TA +85°C Output OFF
ENABLE Input Current
IE TA +85°C, VE = VI = 8 V
COMP Threshold Voltage
VC(t) 4 V VI 8 V, VC increasing from 0
COMP Threshold Volt. TC
αVC 4 V VI 8 V
COMP Threshold Hys.
VC(hys)
4 V VI 8 V
COMP Input Current
IC 0 V VC VO
COMP Input Current TC
αIC 4 V VI 8 V
RESET Leakage Current
IOR VOR = VI = 10 V, TA = +85°C
RESET Output Voltage
VOR IOR = 500 µA
Thermal Shutdown Temp.
TJ
Thermal Resistance
RθJA Mounted on 2.24" x 2.24" solder-coated
copper-clad board in still air
Typical values are at TA = +25°C and are given for circuit design information only.
* Pulse test (50 ms). See previous page for duty cycle limitations.
2.95
2.90
2.70
2.0
1.20
12
150
3.00
3.00
7.0
5.5
12
11
8.0
85
175
46
50
0.05
1.23
34
-25
-0.5
100
108
3.05
3.10
±0.5
14
11
30
25
20
150
TBD
60
65
1.0
0.8
±0.1
1.30
±0.5
50
TBD
-2.5
2.0
400
Units
V
V
V
mV/°C
mV
mV
mV
mV
mV
mV
mV
µA
µA
µA
V
V
µA
V
mV/°C
mV
nA
nA/°C
µA
mV
°C
°C/W

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8182
LOW-DROPOUT,
3 V REGULATOR
TYPICAL CHARACTERISTICS
LOAD REGULATION
3.06
3.04
3.02
3.00
VI = 4 V
2.98
2.96
2.94
TA = -20°C
1 V INTERVALS
VI = 8 V
2.92
0
25 50 75 100
OUTPUT CURRENT in mA
125 150
Dwg. GP-052
3.06
3.04
3.02
3.00
2.98
2.96
2.94
2.92
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
3.06
3.04
3.02
3.00
VI = 4 V
2.98
2.96
2.94
TA = 25°C
1 V INTERVALS
V =8V
I
2.92
0
25 50 75 100
OUTPUT CURRENT in mA
125 150
Dwg. GP-052-1
3.06
3.04
3.02
3.00
2.98
2.96
2.94
2.92
2.0
IO = 100 mA
TA = 25°C
50 mA INTERVALS
IO = 0 mA
3.0 4.0 5.0 6.0
INPUT VOLTAGE in VOLTS
7.0 8.0
Dwg. GP-053-1
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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8182
LOW-DROPOUT,
3 V REGULATOR
TYPICAL CHARACTERISTICS (cont’d)
LOAD REGULATION
LINE REGULATION
3.06
3.04
3.02
VI = 4 V
3.00
2.98
2.96
2.94
TA = 85°C
1 V INTERVALS
2.92
0
25 50 75 100
OUTPUT CURRENT in mA
VI = 8 V
125 150
Dwg. GP-052-2
3.06
3.04
3.02
3.00
2.98
2.96
2.94
2.92
2.0
IO = 100 mA
TA = 85°C
50 mA INTERVALS
IO = 0 mA
3.0 4.0 5.0 6.0
INPUT VOLTAGE in VOLTS
7.0 8.0
Dwg. GP-053-2
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
OUTPUT VOLTAGE
IO = 10 µA - 100 mA
TA = 25°C
1.0 2.0
3.0
INPUT VOLTAGE in VOLTS
4.0
Dwg. GP-056-1
3.01
VI = 6 V
IO = 10 mA
3.00
2.99
2.98
-50 0 +50
AMBIENT TEMPERATURE in °C
+100
Dwg. GP-050
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.