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Электронный компонент: 8181

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8181
LOW-DROPOUT,
5 V REGULATOR
DISCONTINUED PRODUCT
-- FOR REFERENCE ONL
Y
8181
LOW-DROPOUT, 5 V REGULATOR
-- HIGH EFFICIENCY
Especially suited for hand-held, portable, battery-operated equip-
ment such as cellular telephones, the A8181SLB low dropout voltage
regulator provides high efficiency for maximum battery life in a mini-
mum 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.
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 opera-
tion over a temperature range of -20
C to +85
C.
FEATURES AND BENEFITS
s
High Efficiency Provides Extended Battery Life
s
Less Than 300 mV Dropout Voltage
s
Low Quiescent Current
s
>200 mA Output Current
s
LSTTL-Compatible ON/OFF Control
For Sequential Power-up or Emergency Shutdown
s
Internal Thermal Protection
s
SOIC Surface-Mount Package
Always order by complete part number:
A8181SLB
.
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
C
Input Voltage, V
I
................................... 10 V
Output Current, I
O
(40% duty cycle) ............................ 1 A*
(75% duty cycle) ..................... 500 mA*
(continuous) ............................ 370 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.
Data Sheet
27468*
1
2
3
4
5
12
13
14
15
16
GROUND
Dwg. PS-018
6
7
10
11
8
9
GROUND
GROUND
GROUND
NC
NC
NC
OUT
IN
IN
ENABLE
NC
NC
NC
NC
OUT
VR
5 V
8181
LOW-DROPOUT,
5 V REGULATOR
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Maximum Allowable Output Current in Milliamperes with V
I
= 10 V, T
J
= 150
C*
dc (Duty Cycle)
T
A
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
* I
O
= (T
J
- T
A
)/([V
I
- V
O
] R
JA
dc) = (150 - T
A
)/(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.
FUNCTIONAL BLOCK DIAGRAM
12-13
Dwg. FS-012
BIAS
DRIVE
ENABLE
THERMAL
PROTECT.
BANDGAP
REF.
ERROR
AMP
4-5
IN
ENABLE
OUT
IN
OUT
7
8
15
16
6
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.
W
Copyright 1992, 1995 Allegro MicroSystems, Inc.
8181
LOW-DROPOUT,
5 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
T
A
= 25
C, 5.5 V
V
I
10 V,
4.90
5.00
5.10
V
0 mA
I
O
500 mA
T
A
= 85
C, 5.5 V
V
I
10 V,
4.85
--
5.15
V
0 mA
I
O
500 mA*
Output Volt. Temp. Coeff.
VO
I
O
= 0
--
100
--
V/
C
Line Regulation
V
O(
VI)
5.5 V
V
I
10 V, Output open
--
10
30
mV
Load Regulation
V
O(
IO)
0 mA
I
O
500 mA, V
I
= 6 V
--
40
100
mV
Dropout Voltage
V
I
min - V
O
I
O
= 500 mA
--
--
300
mV
Quiescent Current
I
Q
V
I
= 10 V, I
O
= 500 mA
--
87
120
A
V
I
= 10 V, Output open
--
86
120
A
I
Q(off)
V
I
= 10 V, Output open, V
E
= 0.4 V
--
--
20
A
ENABLE Input Voltage
V
EH
Output ON, V
I
= 10 V
2.4
--
--
V
V
EL
Output OFF, V
I
= 10 V
--
--
0.4
V
ENABLE Input Current
I
E
V
E
= V
I
= 10 V
--
--
0.1
A
Thermal Shutdown Temp.
T
J
--
165
--
C
Thermal Resistance
R
JA
Mounted on 2.24" x 2.24" solder-coated
--
67
--
C/W
copper-clad board in still air
R
JT
--
6.0
--
C/W
Typical values are given for circuit design information only.
* This parameter is tested to a lot sample plan only.
Pulse test (<20 ms).
(GND terminal current)
8181
LOW-DROPOUT,
5 V REGULATOR
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
0
OUTPUT CURRENT, I
O
in mA
Dwg. GP-039-1
100
200
400
500
300
T = 25
C
A
5.04
5.00
5.02
4.98
OUTPUT VOLTAGE, V
O
in VOLTS
4.96
4.94
5.06
4.92
V = 7 V
I
V = 6 V
I
V = 8 V
I
V = 10 V
I
V = 5.5 V
I
5.0
Dwg. GP-040-1
6.0
7.0
9.0
10
8.0
T = 25
C
A
5.04
5.00
5.02
4.98
OUTPUT VOLTAGE, V
O
in VOLTS
4.96
4.94
5.06
4.92
I = 0 mA
O
I = 500 mA
O
INPUT VOLTAGE, V
I
in VOLTS
100 mA INTERVALS
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
5.0
Dwg. GP-040
6.0
7.0
9.0
10
8.0
T = -20
C
A
5.04
5.00
5.02
4.98
OUTPUT VOLTAGE, V
O
in VOLTS
4.96
4.94
5.06
4.92
I = 0 mA
O
INPUT VOLTAGE, V
I
in VOLTS
100 mA INTERVALS
I = 500 mA
O
0
OUTPUT CURRENT, I
O
in mA
Dwg. GP-039
100
200
400
500
300
V = 7 V
I
V = 6 V
I
V = 8 V
I
V = 10 V
I
T = -20
C
A
5.04
5.00
5.02
4.98
OUTPUT VOLTAGE, V
O
in VOLTS
4.96
4.94
5.06
4.92
V = 5.5 V
I
LOAD REGULATION
LINE REGULATION
8181
LOW-DROPOUT,
5 V REGULATOR
0
OUTPUT CURRENT, I
O
in mA
Dwg. GP-041
100
200
400
500
300
T = -20
C
T = 25
C
T = 85
C
A
A
A
0.3
0.4
0.2
DROPOUT VOLTAGE in VOLTS
0.1
0.5
0
DROPOUT VOLTAGE
OUTPUT VOLTAGE vs TEMP.
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)
5.0
Dwg. GP-040-2
6.0
7.0
9.0
10
8.0
T = 85
C
A
5.04
5.00
5.02
4.98
OUTPUT VOLTAGE, V
O
in VOLTS
4.96
4.94
5.06
4.92
I = 0 mA
O
I = 500 mA
O
INPUT VOLTAGE, V
I
in VOLTS
100 mA INTERVALS
0
OUTPUT CURRENT, I
O
in mA
Dwg. GP-039-2
100
200
400
500
300
T = 85
C
A
5.04
5.00
5.02
4.98
OUTPUT VOLTAGE, V
O
in VOLTS
4.96
4.94
5.06
4.92
V = 7 V
I
V = 6 V
I
V = 8 V
I
V = 10 V
I
V = 5.5 V
I
LOAD REGULATION
LINE REGULATION
-50
AMBIENT TEMPERATURE, T
A
in
C
Dwg. GP-036
5.01
4.99
0
+50
5.00
+100
4.98
OUTPUT VOLTAGE, V
O
in VOLTS
V = 6 V
I = 0 mA
I
O