8181

8181 ALLEGRO

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LOW-DROPOUT,

5 V REGULATOR

— FOR REFERENCE ONLY 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 n High Efficiency Provides Extended Battery Life n Less Than 300 mV Dropout Voltage n Low Quiescent Current n >200 mA Output Current n LSTTL-Compatible ON/OFF Control For Sequential Power-up or Emergency Shutdown n Internal Thermal Protection n SOIC Surface-Mount Package Always order by complete part number:A8181SLB . ABSOLUTE MAXIMUM RATINGS at TA = +25°C Output Current, IO Operating Temperature Range, Storage Temperature Range, * 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* 51 2 GROUND Dwg. PS-018 71 0 GROUND GROUND GROUND NC NC NC OUT IN IN ENABLE NC NC NC NC OUT VR 5 V

LOW-DROPOUT,

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000 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. FUNCTIONAL BLOCK DIAGRAM 12-13 Dwg. FS-012 BIAS DRIVE ENABLE THERMAL PROTECT. BANDGAP REF. ERROR AMP 4-5 IN ENABLE OUT IN OUT7 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.

LOW-DROPOUT, ELECTRICAL CHARACTERISTICS at TA +25°C (unless otherwise noted). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Output Voltage V O TA = 25°C, 5.5 V ≤ VI ≤ 10 V, 4.90 5.00 5.10 V 0 mA ≤ IO ≤ 500 mA† TA = 85°C, 5.5 V ≤ VI ≤ 10 V, 4.85 — 5.15 V 0 mA ≤ IO ≤ 500 mA*† Output Volt. Temp. Coeff. α VO IO = 0 — ±100 — µV/°C Line Regulation ΔVO(ΔVI) 5.5 V ≤ VI ≤ 10 V, Output open — 10 30 mV Load Regulation ΔVO(Δ IO) 0 mA ≤ IO ≤ 500 mA†, VI = 6 V — 40 100 mV Dropout Voltage V Imin - VO IO = 500 mA† — — 300 mV Quiescent Current I Q 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 ENABLE Input Voltage V EH Output ON, VI = 10 V 2.4 — — V VEL Output OFF, VI = 10 V — — 0.4 V ENABLE Input Current I E VE = VI = 10 V — — ±0.1 µA Thermal Shutdown Temp. T J — 165 — °C Thermal Resistance R θJA Mounted on 2.24" x 2.24" solder-coated — 67 — °C/W copper-clad board in still air R θJT — 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)

LOW-DROPOUT, Worcester, Massachusetts 01615-0036 (508) 853-5000 OUTPUT CURRENT, I O in mA Dwg. GP-039-1 100 200 400 500 300 T = 25°CA 5.04 5.00 5.02 4.98 OUTPUT VOLTAGE, V O in VOLTS 4.96 4.94 5.06 4.92 V = 7 VI V = 6 VI V = 8 VI V = 10 VI V = 5.5 VI 5.0 Dwg. GP-040-1 6.0 7.0 9.0 108.0 T = 25°CA5.04 5.00 5.02 4.98 OUTPUT VOLTAGE, V O in VOLTS 4.96 4.94 5.06 4.92 I = 0 mAO I = 500 mAO 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 9.0 108.0 T = -20°CA5.04 5.00 5.02 4.98 OUTPUT VOLTAGE, V O in VOLTS 4.96 4.94 5.06 4.92 I = 0 mAO INPUT VOLTAGE, V I in VOLTS 100 mA INTERVALS I = 500 mAO OUTPUT CURRENT, I O in mA Dwg. GP-039 100 200 400 500 300 V = 7 VI V = 6 VI V = 8 VI V = 10 VI T = -20°CA 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 VI LOAD REGULATION LINE REGULATION

LOW-DROPOUT, OUTPUT CURRENT, I O in mA Dwg. GP-041 100 200 400 500 300 T = -20°C T = 25°C T = 85°CA A A 0.3 0.4 0.2 DROPOUT VOLTAGE in VOLTS0.1 0.5 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 9.0 108.0 T = 85°CA5.04 5.00 5.02 4.98 OUTPUT VOLTAGE, V O in VOLTS 4.96 4.94 5.06 4.92 I = 0 mAO I = 500 mAO INPUT VOLTAGE, V I in VOLTS 100 mA INTERVALS OUTPUT CURRENT, I O in mA Dwg. GP-039-2 100 200 400 500 300 T = 85°CA5.04 5.00 5.02 4.98 OUTPUT VOLTAGE, V O in VOLTS 4.96 4.94 5.06 4.92 V = 7 VI V = 6 VI V = 8 VI V = 10 VI V = 5.5 VI 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

LOW-DROPOUT, Worcester, Massachusetts 01615-0036 (508) 853-5000 4.0 Dwg. GP-042 6.0 7.0 9.0 108.0 INPUT VOLTAGE, V I in VOLTS QUIESCENT (GROUND TERMINAL) CURRENT in mA 5.03.0 T = 25°CA I = 0 mA O TRANSIENT PERFORMANCE Dwg. WP-018 VO IO 500 mA 20 mA 5.5 V 5.0 V 4.5 V <100 ms <500 ms VI = 5.5 V to 10 V, TA = -20°C to +85°C, CO = 4.7 µF 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) OUTPUT CURRENT, I O in mA Dwg. GP-038 100 200 400 500 300 QUIESCENT (GROUND TERMINAL) CURRENT in mA V = 7 V V = 6 V V = 8 V V = 9 V V = 10 VI I I I I T = 25°CA -50 AMBIENT TEMPERATURE, T A in °C Dwg. GP-037 0 +50 +100 V = 6 V I = 0 mA I O QUIESCENT (GROUND TERMINAL) CURRENT in mA QUIESCENT (GROUND TERMINAL) CURRENT

LOW-DROPOUT, (Based on 1 mm = 0.3937”) 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. Dimensions in Millimeters 0° TO 8° 1 2 3 0.2992 0.2914 0.4133 0.3977 0.419 0.394 0.020 0.013 0.0926 0.1043 0.0040 MIN. 0.0125 0.0091 0.050 0.016 Dwg. MA-008-17A in 0.050 BSC 16 9 0° TO 8° 2 3 7.60 7.40 10.50 10.10 10.65 10.00 0.51 0.33 2.65 2.35 0.10 MIN. 0.32 0.23 1.27 0.40 Dwg. MA-008-17A mm 1.27 BSC

LOW-DROPOUT, Worcester, Massachusetts 01615-0036 (508) 853-5000 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.