Data Sheet 27468.16A 8187 LOW-DROPOUT, 3.3 V REGULATOR -- HIGH EFFICIENCY Designed specifically to meet the requirement for extended operation of battery-powered equipment such as cordless and cellular telephones, the A8187SLT voltage regulator offers the reduced dropout voltage and quiescent current essential for maximum battery life. Applicable also to palmtop computers and personal data assistants, the device delivers a regulated, continuous 3.3 V output at up to 75 mA under normal operating conditions, or to 150 mA (transient) under worst-case conditions. T C U Y D L O N R P EO D C E N U E N R I E T F N E O R C S OR I D F -- 1 2 3 IN GND OUT VR 3.3 V Dwg. PS-022-1 A PMOS pass element provides a typical dropout voltage of only 85 mV at 60 mA of load current. The low dropout voltage permits deeper battery discharge before output regulation is lost. Furthermore, quiescent current does not increase as the dropout voltage is approached, an ideal feature in standby/resume power systems where data integrity is crucial. Regulator accuracy and excellent temperature characteristics are provided by a bandgap reference. This device is supplied in a small-outline plastic transistor package (SOT-89/TO-243AA) for surface-mount applications. The A8187SLT is rated for operation over a temperature range of -20C to +85C. A similar device with an ENABLE input for control over sequential power up, standby, or power down is the A8186SLU. FEATURES AND BENEFITS ABSOLUTE MAXIMUM RATINGS Input Voltage, VI . . . . . . . . . . . . . . 10 V Output Current, IO . . . . . . . . . 150 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. High Efficiency Provides Extended Battery Life 85 mV Typical Dropout Voltage at IO = 60 mA 45 A Typical Quiescent Current at VI = 6 V Up to 150 mA Output Current Internal Thermal Protection Surface-Mount Package APPLICATIONS Cordless and Cellular Telephones Personal Data Assistants Personal Communicators Palmtop Computers Always order by complete part number: A8187SLT . 8187 LOW-DROPOUT, 3.3 V REGULATOR FUNCTIONAL BLOCK DIAGRAM IN 1 OUT 3 ERROR AMP DRIVE THERMAL PROTECT. BIAS BANDGAP REF. GND 2 TAB Dwg. FS-012-4 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 = 8 V, TJ = 150C, Period 10 s* dc (Duty Cycle) TA 100% 90% 80% 70% 60% 50% 40% 30% 20% 25C 100 115 125 145 150 150 150 150 150 50C 80 90 100 115 135 150 150 150 150 70C 65 70 80 90 110 130 150 150 150 85C 50 60 65 75 85 105 130 150 150 * IO = (TJ - TA)/([VI - VO] RJA * dc) = (150 - TA)/(4.7 * 258 * dc) Output current rating can be increased (to 150 mA maximum) by heat sinking or reducing the input voltage. 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 Copyright (c) 1995, 2000 Allegro MicroSystems, Inc. 8187 LOW-DROPOUT, 3.3 V REGULATOR ELECTRICAL CHARACTERISTICS at TA = +25C (unless otherwise noted). Limits Characteristic Symbol Output Voltage VO Output Volt. Temp. Coeff. Line Regulation Load Regulation Dropout Voltage Quiescent Current VO VO(VI) VO(IO) VImin - VO IQ (GND terminal current) Thermal Shutdown Temp. Thermal Resistance Test Conditions Typ. Max. Units 4 V VI 8 V, TA = +25C 3.25 3.30 3.35 V 10 A IO 100 mA* -20C TA +85C 3.20 3.30 3.40 V VI = 3.3 V, IO = 60 mA*, -20C TA +85C 3.00 -- -- V VI = 6 V, IO = 10 mA -- -- 1.0 mV/C 6 V VI 8 V, IO = 1 mA -- 8.0 12 mV 4 V VI 6 V, IO = 1 mA -- 10 20 mV 1 mA IO 100 mA*, VI = 8 V -- 20 30 mV 1 mA IO 100 mA*, VI = 6 V -- 13 25 mV 1 mA IO 100 mA*, VI = 4 V -- 8.0 20 mV IO = 60 mA* -- 85 150 mV IO = 125 mA* -- 190 300 mV VI = 6 V, 1 mA IO 100 mA* -- 45 60 A VI = 8 V, 1 mA IO 100 mA* -- 50 65 A 150 -- -- C -- 258 -- C/W TJ RJA Min. Mounted on 2.24" x 2.24" solder-coated copper-clad board in still air Typical values are at TA = +25C and are given for circuit design information only. * Pulse test (20 ms). See previous page for duty cycle limitations. 8187 LOW-DROPOUT, 3.3 V REGULATOR TYPICAL CHARACTERISTICS LINE REGULATION 3.36 3.36 3.34 3.34 OUTPUT VOLTAGE in VOLTS OUTPUT VOLTAGE in VOLTS LOAD REGULATION 3.32 VI = 8 V VI = 6 V 3.30 3.28 V =4V I 3.26 TA = -20C 3.24 TA = -20C 50 mA INTERVALS 3.32 I O = 0 mA 3.30 IO = 100 mA 3.28 3.26 3.24 3.22 3.22 0 25 50 75 125 100 150 2.0 3.0 4.0 5.0 7.0 6.0 Dwg. GP-053-6 3.36 3.36 3.34 3.34 OUTPUT VOLTAGE in VOLTS OUTPUT VOLTAGE in VOLTS Dwg. GP-052-6 3.32 VI = 8 V 3.30 3.28 V =4V I 3.26 TA = 25C 3.24 8.0 INPUT VOLTAGE in VOLTS OUTPUT CURRENT in mA TA = 25C 50 mA INTERVALS 3.32 I 3.30 O = 0 mA 3.28 IO = 100 mA 3.26 3.24 2 V INTERVALS 3.22 3.22 0 25 50 75 100 125 150 2.0 3.0 4.0 5.0 Dwg. GP-052-7 CAUTION: 6.0 7.0 8.0 INPUT VOLTAGE in VOLTS OUTPUT CURRENT in mA Dwg. GP-053-7 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 8187 LOW-DROPOUT, 3.3 V REGULATOR TYPICAL CHARACTERISTICS (cont'd) LINE REGULATION 3.36 3.36 3.34 3.34 OUTPUT VOLTAGE in VOLTS OUTPUT VOLTAGE in VOLTS LOAD REGULATION 3.32 3.30 VI = 8 V 3.28 3.26 VI = 4 V TA = 85C 3.24 TA = 85C 50 mA INTERVALS 3.32 3.30 IO = 0 mA 3.28 IO = 100 mA 3.26 3.24 2 V INTERVALS 3.22 3.22 0 25 50 75 125 100 2.0 150 3.0 4.0 5.0 6.0 7.0 8.0 INPUT VOLTAGE in VOLTS OUTPUT CURRENT in mA Dwg. GP-053-8 Dwg. GP-052-8 OUTPUT VOLTAGE 3.5 OUTPUT VOLTAGE in VOLTS OUTPUT VOLTAGE in VOLTS 3.0 2.5 2.0 1.5 I O = 0 - 100 mA 1.0 TA = 25C VI = 6 V 3.31 IO = 0 3.30 3.29 3.28 0.5 0 0 1.0 2.0 3.0 4.0 Dwg. GP-059-1 CAUTION: -50 0 +50 +100 AMBIENT TEMPERATURE in C INPUT VOLTAGE in VOLTS Dwg. GP-050-2 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. 8187 LOW-DROPOUT, 3.3 V REGULATOR TYPICAL CHARACTERISTICS (concluded) QUIESCENT (GROUND TERMINAL) CURRENT 50 V =6V I I =0 O 45 40 35 0 -50 +50 +100 QUIESCENT (GROUND TERMINAL) CURRENT in A QUIESCENT (GROUND TERMINAL) CURRENT in A 60 IO = 0 50 40 TA = 85C 30 20 TA = 25C TA = -20C 10 0 0 2.0 AMBIENT TEMPERATURE in C 4.0 8.0 6.0 INPUT VOLTAGE in VOLTS Dwg. GP-051-2 DROPOUT VOLTAGE Dwg. GP-058 LOAD TRANSIENT PERFORMANCE VI = 3.5 V to 6.5 V, CO as specified, TA = 25C 0.25 DROPOUT VOLTAGE in VOLTS 0.20 3.55 V TA = 85C TA = 25C TA = -20C 0.15 VO CO = 10 F 3.3 V 3.05 V 3.8 V VO C O = 1 F 0.10 3.3 V 2.8 V <50 s <600 s 100 mA 0.05 IO 1 mA 0 Dwg. WP-028-1 0 25 50 75 100 125 150 OUTPUT CURRENT in mA Dwg. GP-054-1 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 8187 LOW-DROPOUT, 3.3 V REGULATOR Dimensions in Inches (for reference only) 0.173 0.181 0.064 0.072 0.155 0.167 1 2 0.055 0.063 3 0.090 0.102 0.014 0.017 0.084 0.090 0.014 0.019 0.017 0.022 0.035 0.047 0.059 BSC 0.118 BSC Dwg. MA-009-3 in Dimensions in Millimeters (controlling dimensions) 4.40 4.60 1.62 1.83 3.94 4.25 1 2 1.40 1.60 3 2.29 2.60 0.35 0.44 2.13 2.29 0.36 0.48 0.89 1.20 0.44 0.56 1.50 BSC 3.00 BSC NOTES: 1. Lead spacing tolerance is non-cumulative. 2. Exact body and lead configuration at vendor's option within limits shown. Dwg. MA-009-3 mm 8187 LOW-DROPOUT, 3.3 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. 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