8182
LOW-DROPOUT,
3 V REGULATOR
DISCONTINUED PRODUCT
— FOR REFERENCE ONLY
Designed specifically to meet the requirement for extended opera-
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.
FEATURES AND BENEFITS
■High Efficiency Provides Extended Battery Life
■85 mV Typical Dropout Voltage at IO = 60 mA
■46 µA Typical Quiescent Current at VI = 6 V
Less than 1 µA “Sleep” Current
■Up to 150 mA Output Current
■CMOS-Compatible ON/OFF Control
For Power-Up, Standby, or Shutdown
■Internal Thermal Protection
■Surface-Mount Package
APPLICATIONS
■Cordless and Cellular Telephones
■Personal Data Assistants
■Personal Communicators
■Palmtop Computers
1
2
3
Dwg. PS-020
6
7
8
GND RESET
COMP
OUT
IN
IN
ENABLE
OUT
VR
3 V
45
8182
Data Sheet
27468.2
PRELIMINARY INFORMATION DATA SHEET
(Subject to change without notice)
November 14, 1994
LOW-DROPOUT, 3 V REGULATOR
— HIGH EFFICIENCY
Always order by complete part number: A8182SL .
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI. . . . . . . . . . . . . . 10 V
Output Current, IO. . . . . . . . . 150 mA*
Enable Input Voltage, VE. . . . . . . . . . VI
Reset Output Voltage, VOR . . . . . . . . VI
Reset Output Current, IOR . . . . 1.0 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 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.
8182
LOW-DROPOUT,
3 V REGULATOR
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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 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
*I
O
= (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.
Dwg. FS-012-2
BIAS DRIVE
ENABLE
THERMAL
PROTECT.
BANDGAP
REF.
ERROR
AMP
IN
ENABLE
OUT
IN OUT
7
2
8
1
3
COMP
RESET
5
GND
4
6
1.23 V
–
+
For proper operation, terminals 1 and 8 should be externally connected together,
terminals 2 and 7 should be externally connected together.
FUNCTIONAL BLOCK DIAGRAM
W
Copyright © 1994 Allegro MicroSystems, Inc.
8182
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 — — ±0.5 mV/°C
Line Regulation ∆VO(∆VI) 6 V ≤ VI ≤ 8 V, IO = 1 mA — 7.0 14 mV
4 V ≤ VI ≤ 6 V, IO = 1 mA — 5.5 11 mV
Load Regulation ∆VO(∆IO) 1 mA ≤ IO ≤ 100 mA, VI = 8 V — 12 30 mV
1 mA ≤ IO ≤ 100 mA, VI = 6 V — 11 25 mV
1 mA ≤ IO ≤ 100 mA, VI = 4 V — 8.0 20 mV
Dropout Voltage VImin - VOIO = 60 mA — 85 150 mV
IO = 125 mA* — 175 TBD mV
Quiescent Current IQVI = 6 V, 1 mA ≤ IO ≤ 100 mA, VE ≥ 2.0 V — 46 60 µA
(GND terminal current) VI = 8 V, 1 mA ≤ IO ≤ 100 mA, VE ≥ 2.0 V — 50 65 µA
IQ(off) 4 V ≤ VI ≤ 8 V, VE ≤ 0.8 V — 0.05 1.0 µA
ENABLE Input Voltage VEH 4 V ≤ VI ≤ 8 V, Output ON 2.0 — — V
VEL -20°C ≤ TA ≤ +85°C Output OFF — — 0.8 V
ENABLE Input Current IETA ≤ +85°C, VE = VI = 8 V — — ±0.1 µA
COMP Threshold Voltage VC(t) 4 V ≤ VI ≤ 8 V, VC increasing from 0 1.20 1.23 1.30 V
COMP Threshold Volt. TC αVC 4 V ≤ VI ≤ 8 V — — ±0.5 mV/°C
COMP Threshold Hys. VC(hys) 4 V ≤ VI ≤ 8 V 12 34 50 mV
COMP Input Current IC0 V ≤ VC ≤ VO— -25 TBD nA
COMP Input Current TC αIC 4 V ≤ VI ≤ 8 V — -0.5 -2.5 nA/°C
RESET Leakage Current IOR VOR = VI = 10 V, TA = +85°C — — 2.0 µA
RESET Output Voltage VOR IOR = 500 µA — 100 400 mV
Thermal Shutdown Temp. TJ150 — — °C
Thermal Resistance RθJA Mounted on 2.24" x 2.24" solder-coated — 108 — °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 (≤50 ms). See previous page for duty cycle limitations.
8182
LOW-DROPOUT,
3 V REGULATOR
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
0
OUTPUT CURRENT in mA
Dwg. GP-052
25 50 100 15075
T = -20°C
1 V INTERVALS
A
3.04
3.00
3.02
2.98
OUTPUT VOLTAGE in VOLTS
2.96
2.94
3.06
2.92
V = 8 V
I
125
V = 4 V
I
0
OUTPUT CURRENT in mA
Dwg. GP-052-1
25 50 100 15075
T = 25°C
1 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 = 8 V
I
V = 4 V
I
2.0
Dwg. GP-053
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 mA
O
I = 100 mA
O
INPUT VOLTAGE in VOLTS
7.0
2.0
Dwg. GP-053-1
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 mA
O
I = 100 mA
O
INPUT VOLTAGE in VOLTS
7.0
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.
TYPICAL CHARACTERISTICS
LOAD REGULATION LINE REGULATION
8182
LOW-DROPOUT,
3 V REGULATOR
2.0
Dwg. GP-053-2
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 mA
O
INPUT VOLTAGE in VOLTS
7.0
I = 100 mA
O
-50
AMBIENT TEMPERATURE in °C
Dwg. GP-050
3.01
2.99
0 +50
3.00
+100
2.98
OUTPUT VOLTAGE in VOLTS
V = 6 V
I = 10 mA
I
O
0
OUTPUT CURRENT in mA
Dwg. GP-052-2
25 50 100 15075
T = 85°C
1 V INTERVALS
A
3.04
3.00
3.02
2.98
OUTPUT VOLTAGE in VOLTS
2.96
2.94
3.06
2.92
V = 8 V
I
125
V = 4 V
I
1.0
Dwg. GP-056-1
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 = 10 µA - 100 m
A
O
T = 25°C
A
UNDEFINED
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 Maximum Allowable Output Current table.
LOAD REGULATION LINE REGULATION
TYPICAL CHARACTERISTICS (cont’d)
8182
LOW-DROPOUT,
3 V REGULATOR
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
QUIESCENT (GROUND TERMINAL) CURRENT
-50
AMBIENT TEMPERATURE in °C
Dwg. GP-051
48
0 +50
46
+100
44
QUIESCENT (GROUND TERMINAL) CURRENT in µA
50
V = 6 V
I = 10 mA
V ≥ 2 V
I
O
E
2.0
Dwg. GP-055
4.0 8.0
6.0
INPUT VOLTAGE in VOLTS
0
60
40
30
QUIESCENT (GROUND TERMINAL) CURRENT in µA
0
I = 1 – 100 m
A
O
50
20
10
T = 25°C
A
T = 85°C
A
T = -20°C
A
1.24
Dwg. GP-057
1.26 1.28
COMPARATOR INPUT VOLTAGE in VOLTS
1.22
T = 25°C
A
T = -20°C
A
T = 85°C
A
RESET OUTPUT VOLTAGE in VOLTS
+V
0
V = 6 V
I = 10 mA
I
O
DROPOUT VOLTAGE
0
OUTPUT CURRENT in mA
Dwg. GP-054
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
0125
COMPARATOR 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 Maximum Allowable Output Current table.
TYPICAL CHARACTERISTICS (cont’d)
8182
LOW-DROPOUT,
3 V REGULATOR
LOAD TRANSIENT PERFORMANCE ENABLE TRANSIENT PERFORMANCE
VI = 3.2 V to 6.2 V, CO = 1 µF, IO = 60 mA, TA = 25°CVI = 3.2 V to 6.2 V, CO = 1 µF, TA = 25°C
Dwg. WP-026
V
O
I
O
100 mA
1 mA
3.5 V
3.0 V
2.5 V <100 µs<300 µs
Dwg. WP-027
V
O
V
E
0
3.0 V
0<125 µs<250 µs
V
I
The RESET output of the comparator pro-
duces a logic low whenever the COMP input is
below 1.23 V. An out-of-regulation detector can
be configured by dividing down the regulator
output (an R/R divider is typical) and connecting it
to the COMP input. As tne regulator input is
ramped up, the RESET signal becomes valid
(low) at approximately VI = 1.3 V. The RESET
signal will go high when VC = 1.23 V (VO = 2.46 V
with an R/R divider). Comparator hysteresis
prevents oscillations under low battery conditions.
The RESET open-drain output requires an
external pull-up resistor. This can be returned to
either the input supply or the regulator output,
depending on suystem requirements. Note that
the RESET sink current is adds to the battery
drain in a low-battery condition. Suggested
values range from 100 kΩ to 1 MΩ. RESET
should be left unconnected if it is not used.
INPUT, COMPARATOR, & OUTPUT RELATIONSHIPS
*Comparator input voltage is normally obtained
from a resistive divider off of the output.
10 V MAX.
1.23 V
V
V
V *
1.3 V
3.0 V
V
Dwg. WP-025
C(hys)
OUTPUT UNDEFINED
I
O
C
OR
V
TYPICAL CHARACTERISTICS (concluded)
8182
LOW-DROPOUT,
3 V REGULATOR
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
NOTES: 1. Lead spacing tolerance is non-cumulative.
2. Exact body and lead configuration at vendor’s option within limits shown.
Dimensions in Inches
(Based on 1 mm = 0.03937”)
Dimensions in Millimeters
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.
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.
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. Components made under military approvals will be in
accordance with the approval requirements.
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.
