A8181: Low-Dropout, 5 V Regulator -- High-Efficiency

Data Sheet
27468*
8181
LOW-DROPOUT, 5 V REGULATOR
— HIGH EFFICIENCY
NC
NC
GROUND
GROUND
ENABLE
IN
IN
T
C
U
Y
D
L
O
N
R
P EO
D
C
E
N
U
E
N ER
I
T
F
N
E
O
R
C
S OR
I
D F
—
1
16
OUT
2
15
OUT
3
14
NC
4
13
GROUND
5
12
GROUND
11
NC
7
10
NC
8
9
NC
6
5V
NC
Especially suited for hand-held, portable, battery-operated equipment such as cellular telephones, the A8181SLB low dropout voltage
regulator provides high efficiency for maximum battery life in a minimum package size. Equally applicable to camcorders and portable
computers, the device provides a fixed 5 V regulated continuous output
at almost 200 mA of load current under worst-case conditions. Under
normal operating conditions, output currents over 500 mA are
permitted.
VR
Dwg. PS-018
A MOSFET pass element delivers high output current with an
input-output differential of less than 300 mV. For high efficiency, the
low dropout voltage allows a longer battery discharge before output
voltage regulation is lost. A low quiescent current, even during high
load conditions, makes the device ideal for standby power systems.
High regulator accuracy and excellent temperature characteristics are
provided by a bandgap reference. An enable input gives the designer
complete control over sequential power-up or emergency shutdown.
This device is supplied in a 16-lead wide-body, small-outline
plastic power package (SOIC) for surface-mount applications. The
copper batwing provides for maximum package power dissipation in
the smallest possible construction. The A8181SLB is rated for operation over a temperature range of -20°C to +85°C.
FEATURES AND BENEFITS
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Input Voltage, VI ................................... 10 V
Output Current, IO
(40% duty cycle) ............................ 1 A*
(75% duty cycle) ..................... 500 mA*
(continuous) ............................ 370 mA*
Operating Temperature Range,
TA ................................. -20°C to +85°C
Junction Temperature, TJ .............. +150°C†
Storage Temperature Range,
TS ............................... -40°C to +150°C
■
■
■
■
■
High Efficiency Provides Extended Battery Life
Less Than 300 mV Dropout Voltage
Low Quiescent Current
>200 mA Output Current
LSTTL-Compatible ON/OFF Control
For Sequential Power-up or Emergency Shutdown
■ Internal Thermal Protection
■ SOIC Surface-Mount Package
* 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.
Always order by complete part number: A8181SLB
.
8181
LOW-DROPOUT,
5 V REGULATOR
FUNCTIONAL BLOCK DIAGRAM
IN
7
15
OUT
IN
8
16
OUT
THERMAL
PROTECT.
6
ENABLE
ENABLE
ERROR
AMP
DRIVE
BIAS
BANDGAP
REF.
12-13
4-5
Dwg. FS-012
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 = 10 V, TJ = 150°C*
dc (Duty Cycle)
TA
100%
90%
80%
70%
60%
50%
40%
30%
20%
25°C
370
415
465
530
620
745
930
1000
1000
50°C
295
330
370
425
495
595
745
995
1000
70°C
235
265
295
340
395
475
595
795
1000
85°C
190
215
240
275
320
385
485
645
970
* IO = (TJ - TA)/([VI - VO] RθJA • dc) = (150 - TA)/(5 • 67 • dc)
Output current rating can be increased (to 1 A maximum) by heat sinking or reducing the input voltage. With an infinite heat sink, R-JA = R-JT =
6°C/W. 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
W
Copyright © 1992, 1995 Allegro MicroSystems, Inc.
8181
LOW-DROPOUT,
5 V REGULATOR
ELECTRICAL CHARACTERISTICS at TA +25°C (unless otherwise noted).
Limits
Characteristic
Symbol
Output Voltage
VO
Output Volt. Temp. Coeff.
αVO
Test Conditions
Min.
Typ.
Max.
Units
TA = 25°C, 5.5 V ≤ VI ≤ 10 V,
0 mA ≤ IO ≤ 500 mA†
4.90
5.00
5.10
V
TA = 85°C, 5.5 V ≤ VI ≤ 10 V,
0 mA ≤ IO ≤ 500 mA*†
4.85
—
5.15
V
IO = 0
—
±100
—
µV/°C
Line Regulation
∆VO(∆VI)
5.5 V ≤ VI ≤ 10 V, Output open
—
10
30
mV
Load Regulation
∆VO(∆IO)
0 mA ≤ IO ≤ 500 mA†, VI = 6 V
—
40
100
mV
Dropout Voltage
VImin - VO
IO = 500 mA†
—
—
300
mV
VI = 10 V, IO = 500 mA†
—
87
120
µA
VI = 10 V, Output open
—
86
120
µA
IQ(off)
VI = 10 V, Output open, VE = 0.4 V
—
—
20
µA
VEH
Output ON, VI = 10 V
2.4
—
—
V
VEL
Output OFF, VI = 10 V
—
—
0.4
V
VE = VI = 10 V
—
—
±0.1
µA
—
165
—
°C
—
67
—
°C/W
—
6.0
—
°C/W
Quiescent Current
(GND terminal current)
ENABLE Input Voltage
IQ
ENABLE Input Current
IE
Thermal Shutdown Temp.
TJ
Thermal Resistance
RθJA
Mounted on 2.24" x 2.24" solder-coated
copper-clad board in still air
RθJT
Typical values are given for circuit design information only.
* This parameter is tested to a lot sample plan only.
† Pulse test (<20 ms).
8181
LOW-DROPOUT,
5 V REGULATOR
TYPICAL CHARACTERISTICS
LOAD REGULATION
LINE REGULATION
5.06
5.06
5.04
5.02
in VOLTS
VI = 10 V
VI = 8 V
VI = 7 V
T A = -20°C
100 mA INTERVALS
5.02
IO = 0 mA
O
5.00
OUTPUT VOLTAGE, V
OUTPUT VOLTAGE, V
O
in VOLTS
5.04
4.98
VI = 6 V
V = 5.5 V
4.96
I
4.94
TA = -20°C
4.92
5.00
4.98
IO = 500 mA
4.96
4.94
4.92
0
100
200
300
OUTPUT CURRENT, I
O
400
500
5.0
6.0
in mA
7.0
INPUT VOLTAGE, V
8.0
I
5.04
5.04
in VOLTS
5.06
5.00
4.98
4.96
4.94
VI = 6 V
VI = 5.5 V
T A = 25°C
TA = 25°C
100 mA INTERVALS
5.02
IO = 0 mA
O
5.02
OUTPUT VOLTAGE, V
OUTPUT VOLTAGE, V
Dwg. GP-040
5.06
O
in VOLTS
Dwg. GP-039
VI = 10 V
VI = 8 V
VI = 7 V
10
9.0
in VOLTS
4.92
5.00
4.98
IO = 500 mA
4.96
4.94
4.92
0
100
200
300
OUTPUT CURRENT, I
O
400
500
5.0
6.0
7.0
INPUT VOLTAGE, V
in mA
Dwg. GP-039-1
CAUTION:
8.0
I
10
9.0
in VOLTS
Dwg. GP-040-1
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
8181
LOW-DROPOUT,
5 V REGULATOR
TYPICAL CHARACTERISTICS (cont’d)
LOAD REGULATION
LINE REGULATION
5.06
5.06
in VOLTS
5.02
4.98
4.96
VI = 6 V
V = 5.5 V
4.94
T A = 85°C
100 mA INTERVALS
5.02
IO = 0 mA
O
VI = 10 V
VI = 8 V
VI = 7 V
5.00
OUTPUT VOLTAGE, V
OUTPUT VOLTAGE, V
5.04
T A = 85°C
O
in VOLTS
5.04
5.00
4.98
4.96
IO = 500 mA
4.94
I
4.92
4.92
0
100
200
300
OUTPUT CURRENT, I
400
O
500
5.0
6.0
7.0
INPUT VOLTAGE, V
in mA
8.0
I
10
9.0
in VOLTS
Dwg. GP-039-2
Dwg. GP-040-2
DROPOUT VOLTAGE
OUTPUT VOLTAGE vs TEMP.
in VOLTS
0.5
0.3
VI = 6 V
5.01
I O = 0 mA
O
TA = 85°C
TA = 25°C
TA = -20°C
OUTPUT VOLTAGE, V
DROPOUT VOLTAGE in VOLTS
0.4
0.2
0.1
5.00
4.99
4.98
0
0
100
200
300
OUTPUT CURRENT, I
O
400
500
in mA
0
+100
+50
AMBIENT TEMPERATURE, T
Dwg. GP-041
CAUTION:
-50
A
in ° C
Dwg. GP-036
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.
8181
LOW-DROPOUT,
5 V REGULATOR
TYPICAL CHARACTERISTICS (cont’d)
QUIESCENT (GROUND TERMINAL) CURRENT
87
QUIESCENT (GROUND TERMINAL) CURRENT in µA
QUIESCENT (GROUND TERMINAL) CURRENT in µ A
81
80
79
VI = 6 V
I
O
= 0 mA
78
0
-50
+50
AMBIENT TEMPERATURE, T
A
VI = 10 V
86
VI = 9 V
85
VI = 8 V
84
83
T A = 25°C
VI = 7 V
82
81
VI = 6 V
80
0
+100
100
in °C
200
300
OUTPUT CURRENT, I
O
400
500
in mA
Dwg. GP-038
Dwg. GP-037
TRANSIENT PERFORMANCE
QUIESCENT (GROUND TERMINAL) CURRENT in µ A
90
VI = 5.5 V to 10 V, TA = -20°C to +85°C, CO = 4.7 µF
80
70
5.5 V
60
VO
T = 25°C
A
IO = 0 mA
50
5.0 V
4.5 V
<100 µs
<500 µs
500 mA
40
IO
30
20 mA
20
3.0
4.0
5.0
6.0
INPUT VOLTAGE, V
7.0
I
8.0
9.0
10
in VOLTS
Dwg. WP-018
Dwg. GP-042
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
8181
LOW-DROPOUT,
5 V REGULATOR
Dimensions in Inches
(Based on 1 mm = 0.3937”)
16
9
0.0125
0.0091
0.419
0.394
0.2992
0.2914
0.050
0.016
0.020
0.013
1
2
0.050
3
0° TO 8°
BSC
0.4133
0.3977
0.0926
0.1043
0.0040 MIN.
Dwg. MA-008-17A in
Dimensions in Millimeters
16
9
0.32
0.23
10.65
10.00
7.60
7.40
1.27
0.40
0.51
0.33
1
2
1.27
3
10.50
10.10
BSC
0° TO 8°
2.65
2.35
0.10 MIN.
NOTES: 1. Webbed lead frames. Leads 4, 5, 12, and 13 are internally one piece.
2. Lead spring tolerance is non-cumulative.
3. Exact body and lead configuration at vendor’s option within limits shown.
Dwg. MA-008-17A mm
8181
LOW-DROPOUT,
5 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.
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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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