DISCONTINUED PRODUCT
-- FOR REFERENCE ONLY
Data Sheet
27468.6A
Designed specifically to meet the requirement for extended opera-
tion of battery-powered equipment such as cordless and cellular
telephones, the A8184SLT 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, continuous 3 V output at up to 75 mA under
normal operating conditions, or to 150 mA (transient) under worst-case
conditions.
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. Furthermore,
quiescent current does not increase 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.
This device is supplied in a small-outline plastic transistor package
(SOT-89/TO-243AA) for surface-mount applications. The A8184SLT is
rated for operation over a temperature range of -20
C to +85C. A
similar device with an ENABLE input for control over sequential power
up, standby, or power down is the A8183SLU.
FEATURES AND BENEFITS
I High Efficiency Provides Extended Battery Life
I 90 mV Typical Dropout Voltage at I
O
= 60 mA
I 45 A Typical Quiescent Current at V
I
= 6 V
I Up to 150 mA Output Current
I Internal Thermal Protection
I Surface-Mount Package
APPLICATIONS
I Cordless and Cellular Telephones
I Personal Data Assistants
I Personal Communicators
I Palmtop Computers
Dwg. PS-022
VR
3 V
2
3
1
GND
OUT
IN
LOW-DROPOUT, 3 V REGULATOR
-- HIGH EFFICIENCY
Always order by complete part number:
A8184SLT
.
ABSOLUTE MAXIMUM RATINGS
Input Voltage, V
I
. . . . . . . . . . . . . . 10 V
Output Current, I
O
. . . . . . . . . 150 mA*
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 temperature. Under
any 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.
8184
8184
LOW-DROPOUT,
3 V REGULATOR
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
FUNCTIONAL BLOCK DIAGRAM
Dwg. FS-012-4
BIAS
DRIVE
THERMAL
PROTECT.
BANDGAP
REF.
ERROR
AMP
TAB
IN
1
OUT
3
GND
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 V
I
= 8 V, T
J
= 150
C, Period 10 s*
dc (Duty Cycle)
T
A
100%
90%
80%
70%
60%
50%
40%
30%
20%
25
C
95
105
120
135
150
150
150
150
150
50
C
75
85
95
110
125
150
150
150
150
70
C
60
65
75
85
100
120
150
150
150
85
C
50
55
60
70
80
100
125
150
150
* I
O
= (T
J
- T
A
)/([V
I
- V
O
] R
JA
dc) = (150 - T
A
)/(5 258 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.
Copyright 1994, 2000, Allegro MicroSystems, Inc.
8184
LOW-DROPOUT,
3 V REGULATOR
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,
T
A
= +25
C
2.95
3.00
3.05
V
10
A I
O
100 mA* -20C T
A
+85C
2.90
3.00
3.10
V
V
I
= 3 V, I
O
= 60 mA*, -20
C T
A
+85C
2.70
--
--
V
Output Volt. Temp. Coeff.
VO
V
I
= 6 V, I
O
= 10 mA
--
--
1.0
mV/
C
Line Regulation
V
O(
VI)
6 V
V
I
8 V, I
O
= 1 mA
--
4.0
10
mV
4 V
V
I
6 V, I
O
= 1 mA
--
9.5
18
mV
Load Regulation
V
O(
IO)
1 mA
I
O
100 mA*, V
I
= 8 V
--
19
30
mV
1 mA
I
O
100 mA*, V
I
= 6 V
--
14
25
mV
1 mA
I
O
100 mA*, V
I
= 4 V
--
8.0
20
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
= 6 V, 1 mA
I
O
100 mA*, V
E
2.0 V
--
45
60
A
(GND terminal current)
V
I
= 8 V, 1 mA
I
O
100 mA*, V
E
2.0 V
--
50
65
A
Thermal Shutdown Temp.
T
J
150
--
--
C
Thermal Resistance
R
JA
Mounted on 2.24" x 2.24" solder-coated
--
258
--
C/W
copper-clad board in still air
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.
8184
LOW-DROPOUT,
3 V REGULATOR
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TYPICAL CHARACTERISTICS
LOAD REGULATION
LINE REGULATION
2.0
Dwg. GP-053-3
3.0
4.0
6.0
8.0
5.0
T = -20
C
50 mA INTERVALS
A
3.04
3.00
3.02
2.98
OUTPUT VOLTAGE in VOLTS
2.96
2.94
3.06
2.92
I = 0 mA
O
I = 100 mA
O
INPUT VOLTAGE in VOLTS
7.0
0
OUTPUT CURRENT in mA
Dwg. GP-052-3
25
50
100
150
75
T = -20
C
A
3.04
3.00
3.02
2.98
OUTPUT VOLTAGE in VOLTS
2.96
2.94
3.06
2.92
125
V = 8 V
I
V = 4 V
I
V = 6 V
I
2.0
Dwg. GP-053-4
3.0
4.0
6.0
8.0
5.0
T = 25
C
50 mA INTERVALS
A
3.04
3.00
3.02
2.98
OUTPUT VOLTAGE in VOLTS
2.96
2.94
3.06
2.92
I = 0 mA
O
INPUT VOLTAGE in VOLTS
7.0
I = 100 mA
O
0
OUTPUT CURRENT in mA
Dwg. GP-052-4
25
50
100
150
75
T = 25
C
2 V INTERVALS
A
3.04
3.00
3.02
2.98
OUTPUT VOLTAGE in VOLTS
2.96
2.94
3.06
2.92
125
V = 4 V
I
V = 8 V
I
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.
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