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 +85°C. A
similar device with an ENABLE input for control over sequential power
up, standby, or power down is the A8183SLU.
FEATURES AND BENEFITS
■High Efficiency Provides Extended Battery Life
■90 mV Typical Dropout Voltage at IO = 60 mA
■45 µA Typical Quiescent Current at VI = 6 V
■Up to 150 mA Output Current
■Internal Thermal Protection
■Surface-Mount Package
APPLICATIONS
■Cordless and Cellular Telephones
■Personal Data Assistants
■Personal Communicators
■Palmtop Computers
Dwg. PS-022
VR 3 V
231
GND
OUT
IN
LOW-DROPOUT, 3 V REGULATOR
— HIGH EFFICIENCY
Always order by complete part number: A8184SLT .
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI. . . . . . . . . . . . . . 10 V
Output Current, IO. . . . . . . . . 150 mA*
Operating Temperature Range,
TA. . . . . . . . . . . . . -20°C to +85°C
Junction Temperature, TJ. . . +150°C†
Storage Temperature Range,
TS. . . . . . . . . . . . -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 1OUT
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 VI = 8 V, TJ = 150°C, Period ≤10 s*
dc (Duty Cycle)
TA100% 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 = (TJ - TA)/([VI - VO] RθJA • dc) = (150 - TA)/(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 TA = +25°C (unless otherwise noted).
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Output Voltage VO4 V ≤ VI ≤ 8 V, TA = +25°C 2.95 3.00 3.05 V
10 µA ≤ IO ≤ 100 mA* -20°C ≤ TA ≤ +85°C 2.90 3.00 3.10 V
VI = 3 V, IO = 60 mA*, -20°C ≤ TA ≤ +85°C 2.70 — — V
Output Volt. Temp. Coeff. αVO VI = 6 V, IO = 10 mA — — ±1.0 mV/°C
Line Regulation ∆VO(∆VI) 6 V ≤ VI ≤ 8 V, IO = 1 mA — 4.0 10 mV
4 V ≤ VI ≤ 6 V, IO = 1 mA — 9.5 18 mV
Load Regulation ∆VO(∆IO) 1 mA ≤ IO ≤ 100 mA*, VI = 8 V — 19 30 mV
1 mA ≤ IO ≤ 100 mA*, VI = 6 V — 14 25 mV
1 mA ≤ IO ≤ 100 mA*, VI = 4 V — 8.0 20 mV
Dropout Voltage VImin - VOIO = 60 mA* — 90 150 mV
IO = 125 mA* — 190 300 mV
Quiescent Current IQVI = 6 V, 1 mA ≤ IO ≤ 100 mA*, VE ≥ 2.0 V — 45 60 µA
(GND terminal current) VI = 8 V, 1 mA ≤ IO ≤ 100 mA*, VE ≥ 2.0 V — 50 65 µA
Thermal Shutdown Temp. TJ150 — — °C
Thermal Resistance RθJA Mounted on 2.24" x 2.24" solder-coated — 258 — °C/W
copper-clad board in still air
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.
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 8.05.0
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 m
A
O
I = 100 mA
O
INPUT VOLTAGE in VOLTS
7.0
0
OUTPUT CURRENT in mA
Dwg. GP-052-3
25 50 100 15075
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 8.05.0
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 m
A
O
INPUT VOLTAGE in VOLTS
7.0
I = 100 mA
O
0
OUTPUT CURRENT in mA
Dwg. GP-052-4
25 50 100 15075
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.
8184
LOW-DROPOUT,
3 V REGULATOR
TYPICAL CHARACTERISTICS (cont’d)
LOAD REGULATION LINE REGULATION
0
OUTPUT CURRENT in mA
Dwg. GP-052-5
25 50 100 15075
T = 85°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
V = 4 V
I
V = 8 V
I
125
2.0
Dwg. GP-053-5
3.0 4.0 6.0 8.05.0
T = 85°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 m
A
O
INPUT VOLTAGE in VOLTS
7.0
I = 100 mA
O
OUTPUT VOLTAGE
-50
AMBIENT TEMPERATURE in °C
Dwg. GP-050-1
3.01
2.99
0 +50
3.00
+100
2.98
OUTPUT VOLTAGE in VOLTS
V = 6 V
I = 0
I
O
1.0
Dwg. GP-059
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 m
A
O
T = 25°C
A
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.
8184
LOW-DROPOUT,
3 V REGULATOR
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TYPICAL CHARACTERISTICS (concluded)
QUIESCENT (GROUND TERMINAL) CURRENT
2.0
Dwg. GP-058
4.0 8.0
6.0
INPUT VOLTAGE in VOLTS
0
60
40
30
QUIESCENT (GROUND TERMINAL) CURRENT in µA
0
I = 0
O
50
20
10
T = 25°C
A
T = -20°C
A
T = 85°C
A
-50
AMBIENT TEMPERATURE in °C
Dwg. GP-051-2
45
0 +50
40
+100
35
QUIESCENT (GROUND TERMINAL) CURRENT in µA
50
V = 6 V
I = 0
I
O
0
OUTPUT CURRENT in mA
Dwg. GP-054-1
25 50 100 15075
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
DROPOUT VOLTAGE LOAD TRANSIENT PERFORMANCE
VI = 3.2 V to 6.2 V, CO as specified, TA = 25°C
Dwg. WP-028
VO
IO
100 mA
1 mA
3.5 V
3.0 V
2.5 V
<50 µs<600 µs
VO
3.25 V
3.0 V
2.75 V
C = 10 µF
O
C = 1 µF
O
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.
8184
LOW-DROPOUT,
3 V REGULATOR
Dimensions in Inches
(for reference only)
Dwg. MA-009-3 in
123
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
Dimensions in Millimeters
(controlling dimensions)
Dwg. MA-009-3 mm
123
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
NOTES: 1. Lead spacing tolerance is non-cumulative.
2. Exact body and lead configuration at vendor’s option within limits shown.
8184
LOW-DROPOUT,
3 V REGULATOR
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 responsibility for its use; nor for any infringements
of patents or other rights of third parties which may result from its use.
