A8187: Low-Dropout, 3.3 V Regulator -- High Efficiency

Data Sheet
27468.16A
8187
LOW-DROPOUT, 3.3 V REGULATOR
— HIGH EFFICIENCY
Designed specifically to meet the requirement for extended operation of battery-powered equipment such as cordless and cellular
telephones, the A8187SLT 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 3.3 V output at up to 75 mA
under normal operating conditions, or to 150 mA (transient) under
worst-case conditions.
T
C
U
Y
D
L
O
N
R
P EO
D
C
E
N
U
E
N
R
I
E
T
F
N
E
O
R
C
S OR
I
D F
—
1
2
3
IN
GND
OUT
VR
3.3 V
Dwg. PS-022-1
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.
This device is supplied in a small-outline plastic transistor package
(SOT-89/TO-243AA) for surface-mount applications. The A8187SLT 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 A8186SLU.
FEATURES AND BENEFITS
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.
■
■
■
■
■
■
High Efficiency Provides Extended Battery Life
85 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
Always order by complete part number: A8187SLT .
8187
LOW-DROPOUT,
3.3 V REGULATOR
FUNCTIONAL BLOCK DIAGRAM
IN
1
OUT
3
ERROR
AMP
DRIVE
THERMAL
PROTECT.
BIAS
BANDGAP
REF.
GND 2
TAB
Dwg. FS-012-4
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
100
115
125
145
150
150
150
150
150
50°C
80
90
100
115
135
150
150
150
150
70°C
65
70
80
90
110
130
150
150
150
85°C
50
60
65
75
85
105
130
150
150
* IO = (TJ - TA)/([VI - VO] RθJA • dc) = (150 - TA)/(4.7 • 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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1995, 2000 Allegro MicroSystems, Inc.
8187
LOW-DROPOUT,
3.3 V REGULATOR
ELECTRICAL CHARACTERISTICS at TA = +25°C (unless otherwise noted).
Limits
Characteristic
Symbol
Output Voltage
VO
Output Volt. Temp. Coeff.
Line Regulation
Load Regulation
Dropout Voltage
Quiescent Current
αVO
∆VO(∆VI)
∆VO(∆IO)
VImin - VO
IQ
(GND terminal current)
Thermal Shutdown Temp.
Thermal Resistance
Test Conditions
Typ.
Max.
Units
4 V ≤ VI ≤ 8 V,
TA = +25°C
3.25
3.30
3.35
V
10 µA ≤ IO ≤ 100 mA*
-20°C ≤ TA ≤ +85°C
3.20
3.30
3.40
V
VI = 3.3 V, IO = 60 mA*, -20°C ≤ TA ≤ +85°C
3.00
—
—
V
VI = 6 V, IO = 10 mA
—
—
±1.0
mV/°C
6 V ≤ VI ≤ 8 V, IO = 1 mA
—
8.0
12
mV
4 V ≤ VI ≤ 6 V, IO = 1 mA
—
10
20
mV
1 mA ≤ IO ≤ 100 mA*, VI = 8 V
—
20
30
mV
1 mA ≤ IO ≤ 100 mA*, VI = 6 V
—
13
25
mV
1 mA ≤ IO ≤ 100 mA*, VI = 4 V
—
8.0
20
mV
IO = 60 mA*
—
85
150
mV
IO = 125 mA*
—
190
300
mV
VI = 6 V, 1 mA ≤ IO ≤ 100 mA*
—
45
60
µA
VI = 8 V, 1 mA ≤ IO ≤ 100 mA*
—
50
65
µA
150
—
—
°C
—
258
—
°C/W
TJ
RθJA
Min.
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 (≤20 ms). See previous page for duty cycle limitations.
8187
LOW-DROPOUT,
3.3 V REGULATOR
TYPICAL CHARACTERISTICS
LINE REGULATION
3.36
3.36
3.34
3.34
OUTPUT VOLTAGE in VOLTS
OUTPUT VOLTAGE in VOLTS
LOAD REGULATION
3.32
VI = 8 V
VI = 6 V
3.30
3.28
V =4V
I
3.26
TA = -20°C
3.24
TA = -20°C
50 mA INTERVALS
3.32
I O = 0 mA
3.30
IO = 100 mA
3.28
3.26
3.24
3.22
3.22
0
25
50
75
125
100
150
2.0
3.0
4.0
5.0
7.0
6.0
Dwg. GP-053-6
3.36
3.36
3.34
3.34
OUTPUT VOLTAGE in VOLTS
OUTPUT VOLTAGE in VOLTS
Dwg. GP-052-6
3.32
VI = 8 V
3.30
3.28
V =4V
I
3.26
TA = 25°C
3.24
8.0
INPUT VOLTAGE in VOLTS
OUTPUT CURRENT in mA
TA = 25°C
50 mA INTERVALS
3.32
I
3.30
O
= 0 mA
3.28
IO = 100 mA
3.26
3.24
2 V INTERVALS
3.22
3.22
0
25
50
75
100
125
150
2.0
3.0
4.0
5.0
Dwg. GP-052-7
CAUTION:
6.0
7.0
8.0
INPUT VOLTAGE in VOLTS
OUTPUT CURRENT in mA
Dwg. GP-053-7
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
8187
LOW-DROPOUT,
3.3 V REGULATOR
TYPICAL CHARACTERISTICS (cont’d)
LINE REGULATION
3.36
3.36
3.34
3.34
OUTPUT VOLTAGE in VOLTS
OUTPUT VOLTAGE in VOLTS
LOAD REGULATION
3.32
3.30
VI = 8 V
3.28
3.26
VI = 4 V
TA = 85°C
3.24
TA = 85°C
50 mA INTERVALS
3.32
3.30
IO = 0 mA
3.28
IO = 100 mA
3.26
3.24
2 V INTERVALS
3.22
3.22
0
25
50
75
125
100
2.0
150
3.0
4.0
5.0
6.0
7.0
8.0
INPUT VOLTAGE in VOLTS
OUTPUT CURRENT in mA
Dwg. GP-053-8
Dwg. GP-052-8
OUTPUT VOLTAGE
3.5
OUTPUT VOLTAGE in VOLTS
OUTPUT VOLTAGE in VOLTS
3.0
2.5
2.0
1.5
I O = 0 - 100 mA
1.0
TA = 25°C
VI = 6 V
3.31
IO = 0
3.30
3.29
3.28
0.5
0
0
1.0
2.0
3.0
4.0
Dwg. GP-059-1
CAUTION:
-50
0
+50
+100
AMBIENT TEMPERATURE in °C
INPUT VOLTAGE in VOLTS
Dwg. GP-050-2
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.
8187
LOW-DROPOUT,
3.3 V REGULATOR
TYPICAL CHARACTERISTICS (concluded)
QUIESCENT (GROUND TERMINAL) CURRENT
50
V =6V
I
I =0
O
45
40
35
0
-50
+50
+100
QUIESCENT (GROUND TERMINAL) CURRENT in µA
QUIESCENT (GROUND TERMINAL) CURRENT in µA
60
IO = 0
50
40
TA = 85°C
30
20
TA = 25°C
TA = -20°C
10
0
0
2.0
AMBIENT TEMPERATURE in °C
4.0
8.0
6.0
INPUT VOLTAGE in VOLTS
Dwg. GP-051-2
DROPOUT VOLTAGE
Dwg. GP-058
LOAD TRANSIENT PERFORMANCE
VI = 3.5 V to 6.5 V, CO as specified, TA = 25°C
0.25
DROPOUT VOLTAGE in VOLTS
0.20
3.55 V
TA = 85°C
TA = 25°C
TA = -20°C
0.15
VO
CO = 10 µF
3.3 V
3.05 V
3.8 V
VO
C O = 1 µF
0.10
3.3 V
2.8 V
<50 µs
<600 µs
100 mA
0.05
IO
1 mA
0
Dwg. WP-028-1
0
25
50
75
100
125
150
OUTPUT CURRENT in mA
Dwg. GP-054-1
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
8187
LOW-DROPOUT,
3.3 V REGULATOR
Dimensions in Inches
(for reference only)
0.173
0.181
0.064
0.072
0.155
0.167
1
2
0.055
0.063
3
0.090
0.102
0.014
0.017
0.084
0.090
0.014
0.019
0.017
0.022
0.035
0.047
0.059
BSC
0.118
BSC
Dwg. MA-009-3 in
Dimensions in Millimeters
(controlling dimensions)
4.40
4.60
1.62
1.83
3.94
4.25
1
2
1.40
1.60
3
2.29
2.60
0.35
0.44
2.13
2.29
0.36
0.48
0.89
1.20
0.44
0.56
1.50
BSC
3.00
BSC
NOTES: 1. Lead spacing tolerance is non-cumulative.
2. Exact body and lead configuration at vendor’s option within limits shown.
Dwg. MA-009-3 mm
8187
LOW-DROPOUT,
3.3 V REGULATOR
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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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