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