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8181
LOW-DROPOUT, 5 V REGULATOR
8181
LOW-DROPOUT, 5 V REGULATOR -- HIGH EFFICIENCY
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. 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 -20C to +85C.
Data Sheet 27468*
GROUND GROUND ENABLE
ABSOLUTE MAXIMUM RATINGS at TA = +25C
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 ................................. -20C to +85C Junction Temperature, TJ .............. +150C Storage Temperature Range, TS ............................... -40C to +150C
* 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 +150C. 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.
T C UY DL ON RO PE DC EN UE IN ER TF NE OR CR IS O DF --
NC NC NC 1 2 3 4 5 16 15 14 13 12 11 10 9 OUT OUT NC
5V
GROUND GROUND NC NC NC
6 7
VR
IN IN
8
Dwg. PS-018
FEATURES AND BENEFITS
s s s s s
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 s Internal Thermal Protection s SOIC Surface-Mount Package
Always order by complete part number: A8181SLB
.
8181
LOW-DROPOUT, 5 V REGULATOR
FUNCTIONAL BLOCK DIAGRAM
IN IN
7 8 15 16
OUT OUT
BIAS
DRIVE
ERROR AMP
ENABLE
6
THERMAL PROTECT.
ENABLE
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 = 150C* dc (Duty Cycle) TA 25C 50C 70C 85C 100% 370 295 235 190 90% 415 330 265 215 80% 465 370 295 240 70% 530 425 340 275 60% 620 495 395 320 50% 745 595 475 385 40% 930 745 595 485 30% 1000 995 795 645 20% 1000 1000 1000 970
* IO = (TJ - TA)/([VI - VO] RJA * 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 = 6C/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 (c) 1992, 1995 Allegro MicroSystems, Inc.
8181
LOW-DROPOUT, 5 V REGULATOR
ELECTRICAL CHARACTERISTICS at TA +25C (unless otherwise noted).
Limits Characteristic Output Voltage Symbol VO Test Conditions TA = 25C, 5.5 V VI 10 V, 0 mA IO 500 mA TA = 85C, 5.5 V VI 10 V, 0 mA IO 500 mA* Output Volt. Temp. Coeff. Line Regulation Load Regulation Dropout Voltage Quiescent Current (GND terminal current) VO VO(VI) VO(IO) VImin - VO IQ IO = 0 5.5 V VI 10 V, Output open 0 mA IO 500 mA, VI = 6 V IO = 500 mA VI = 10 V, IO = 500 mA VI = 10 V, Output open IQ(off) ENABLE Input Voltage VEH VEL ENABLE Input Current Thermal Shutdown Temp. Thermal Resistance IE TJ RJA RJT
Typical values are given for circuit design information only. * This parameter is tested to a lot sample plan only. Pulse test (<20 ms).
Min. 4.90
Typ. 5.00
Max. 5.10
Units V
4.85
-- 100 10 40 -- 87 86 -- -- -- -- 165 67
5.15
V V/C mV mV mV A A A V V A C C/W C/W
-- -- -- -- -- -- -- 2.4 -- -- --
-- 30 100 300 120 120 20 -- 0.4 0.1 -- --
VI = 10 V, Output open, VE = 0.4 V Output ON, VI = 10 V Output OFF, VI = 10 V VE = VI = 10 V
Mounted on 2.24" x 2.24" solder-coated copper-clad board in still air
--
--
6.0
--
8181
LOW-DROPOUT, 5 V REGULATOR
TYPICAL CHARACTERISTICS LOAD REGULATION
5.06
LINE REGULATION
5.06
5.04
5.04
OUTPUT VOLTAGE, VO in VOLTS
5.02
OUTPUT VOLTAGE, VO in VOLTS
VI = 10 V VI = 8 V VI = 7 V
T A = -20C
100 mA INTERVALS
5.02 IO = 0 mA 5.00
5.00
4.98 VI = 6 V V = 5.5 V
I
4.98 IO = 500 mA 4.96
4.96
4.94
TA = -20C
4.94
4.92 0 100 200 300 400 500 OUTPUT CURRENT, IO in mA
Dwg. GP-039
4.92 5.0 6.0 7.0 8.0 9.0 10 INPUT VOLTAGE, VI in VOLTS
Dwg. GP-040
5.06
5.06
5.04
5.04 VI = 10 V VI = 8 V VI = 7 V
OUTPUT VOLTAGE, VO in VOLTS
TA = 25C
100 mA INTERVALS
OUTPUT VOLTAGE, VO in VOLTS
5.02
5.02 IO = 0 mA 5.00
5.00
4.98
4.98 IO = 500 mA
4.96 VI = 6 V VI = 5.5 V
4.96
4.94
T A = 25C
4.94
4.92 0 100 200 300 400 500 OUTPUT CURRENT, IO in mA
Dwg. GP-039-1
4.92 5.0 6.0 7.0 8.0 9.0 10 INPUT VOLTAGE, VI in VOLTS
Dwg. GP-040-1
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
8181
LOW-DROPOUT, 5 V REGULATOR
TYPICAL CHARACTERISTICS (cont'd) LOAD REGULATION
5.06
5.06
LINE REGULATION
5.04
T A = 85C
5.04
T A = 85C
100 mA INTERVALS
OUTPUT VOLTAGE, VO in VOLTS
5.02 VI = 10 V VI = 8 V VI = 7 V
OUTPUT VOLTAGE, VO in VOLTS
5.02 IO = 0 mA 5.00
5.00
4.98
4.98
4.96 VI = 6 V V = 5.5 V
I
4.96 IO = 500 mA
4.94
4.94
4.92 0 100 200 300 400 500 OUTPUT CURRENT, IO in mA
Dwg. GP-039-2
4.92 5.0 6.0 7.0 8.0 9.0 10 INPUT VOLTAGE, VI in VOLTS
Dwg. GP-040-2
DROPOUT VOLTAGE
0.5
OUTPUT VOLTAGE vs TEMP.
0.4
OUTPUT VOLTAGE, VO in VOLTS
DROPOUT VOLTAGE in VOLTS
VI = 6 V
0.3
TA = 85C TA = 25C TA = -20C
5.01
I O = 0 mA
5.00
4.99
0.2
4.98
0.1
0 0 100 200 300 400 500
-50
0
+50
+100
OUTPUT CURRENT, IO in mA
Dwg. GP-041
AMBIENT TEMPERATURE, TA in C
Dwg. GP-036
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.
8181
LOW-DROPOUT, 5 V REGULATOR
TYPICAL CHARACTERISTICS (cont'd) QUIESCENT (GROUND TERMINAL) CURRENT
81
QUIESCENT (GROUND TERMINAL) CURRENT in A QUIESCENT (GROUND TERMINAL) CURRENT in A
87 VI = 10 V VI = 9 V 85 VI = 8 V
86
80
84
79
VI = 6 V I O = 0 mA
83 VI = 7 V 82
T A = 25C
78
81
VI = 6 V
80 0 100 200 300 400 500 OUTPUT CURRENT, IO in mA
-50
0
+50
+100
AMBIENT TEMPERATURE, TA in C
Dwg. GP-037
Dwg. GP-038
TRANSIENT PERFORMANCE
90
QUIESCENT (GROUND TERMINAL) CURRENT in A
80
VI = 5.5 V to 10 V, TA = -20C to +85C, CO = 4.7 F
70
5.5 V
60 TA = 25C IO = 0 mA
VO
5.0 V 4.5 V <100 s 500 mA <500 s
50
40
30
IO 20 mA
20 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10
Dwg. WP-018
Dwg. GP-042
INPUT VOLTAGE, VI in VOLTS
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
0.2992 0.2914
0.419 0.394
0.050 0.016 0.020 0.013
1
2
3 0.4133 0.3977
0.050
BSC
0 TO 8
0.0926 0.1043 0.0040 MIN.
Dwg. MA-008-17A in
Dimensions in Millimeters
16 9 0.32 0.23
7.60 7.40
10.65 10.00
1.27 0.40 0.51 0.33
1
2
3 10.50 10.10
1.27
BSC
0 TO 8
2.65 2.35 0.10 MIN.
Dwg. MA-008-17A mm
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.
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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