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| 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. 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. Data Sheet 27468.16A 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. T C UY DL ON RO PE DC EN UE IN ER TF NE OR CR IS O DF -- VR 3.3 V 1 2 3 GND Dwg. PS-022-1 OUT IN FEATURES AND BENEFITS I I I I I I 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 I I I I Cordless and Cellular Telephones Personal Data Assistants Personal Communicators Palmtop Computers 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: A8187SLT . 8187 LOW-DROPOUT, 3.3 V REGULATOR FUNCTIONAL BLOCK DIAGRAM IN 1 3 OUT BIAS DRIVE ERROR AMP THERMAL PROTECT. 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 25C 50C 70C 85C 100% 100 80 65 50 90% 115 90 70 60 80% 125 100 80 65 70% 145 115 90 75 60% 150 135 110 85 50% 150 150 130 105 40% 150 150 150 130 30% 150 150 150 150 20% 150 150 150 150 * 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 Output Voltage Symbol VO Test Conditions 4 V VI 8 V, 10 A IO 100 mA* TA = +25C -20C TA +85C Min. 3.25 3.20 3.00 -- -- -- -- -- -- -- -- -- -- 150 Mounted on 2.24" x 2.24" solder-coated copper-clad board in still air -- Typ. 3.30 3.30 -- -- 8.0 10 20 13 8.0 85 190 45 50 -- 258 Max. 3.35 3.40 -- 1.0 12 20 30 25 20 150 300 60 65 -- -- Units V V V mV/C mV mV mV mV mV mV mV A A C C/W VI = 3.3 V, IO = 60 mA*, -20C TA +85C Output Volt. Temp. Coeff. Line Regulation VO VO(VI) VI = 6 V, IO = 10 mA 6 V VI 8 V, IO = 1 mA 4 V VI 6 V, IO = 1 mA Load Regulation VO(IO) 1 mA IO 100 mA*, VI = 8 V 1 mA IO 100 mA*, VI = 6 V 1 mA IO 100 mA*, VI = 4 V Dropout Voltage VImin - VO IO = 60 mA* IO = 125 mA* Quiescent Current (GND terminal current) Thermal Shutdown Temp. Thermal Resistance TJ RJA IQ VI = 6 V, 1 mA IO 100 mA* VI = 8 V, 1 mA IO 100 mA* 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 LOAD REGULATION LINE REGULATION 3.36 3.36 TA = -20C 50 mA INTERVALS 3.34 3.34 OUTPUT VOLTAGE in VOLTS OUTPUT VOLTAGE in VOLTS 3.32 VI = 8 V 3.30 VI = 6 V 3.32 I O = 0 mA IO = 100 mA 3.30 3.28 V =4V I 3.28 3.26 TA = -20C 3.26 3.24 3.24 3.22 0 25 50 75 100 125 150 OUTPUT CURRENT in mA Dwg. GP-052-6 3.22 2.0 3.0 4.0 5.0 6.0 7.0 8.0 INPUT VOLTAGE in VOLTS Dwg. GP-053-6 3.36 3.36 TA = 25C 50 mA INTERVALS 3.34 3.34 OUTPUT VOLTAGE in VOLTS OUTPUT VOLTAGE in VOLTS 3.32 3.32 I = 0 mA 3.30 VI = 8 V 3.30 O 3.28 V =4V I 3.28 IO = 100 mA 3.26 TA = 25C 2 V INTERVALS 3.26 3.24 3.24 3.22 0 25 50 75 100 125 150 OUTPUT CURRENT in mA Dwg. GP-052-7 3.22 2.0 3.0 4.0 5.0 6.0 7.0 8.0 INPUT VOLTAGE in VOLTS Dwg. GP-053-7 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 TYPICAL CHARACTERISTICS (cont'd) LOAD REGULATION 3.36 3.36 TA = 85C 50 mA INTERVALS LINE REGULATION 3.34 3.34 OUTPUT VOLTAGE in VOLTS OUTPUT VOLTAGE in VOLTS 3.32 3.32 3.30 VI = 8 V 3.28 3.30 IO = 0 mA 3.28 3.26 TA = 85C 2 V INTERVALS VI = 4 V 3.26 IO = 100 mA 3.24 3.24 3.22 0 25 50 75 100 125 150 OUTPUT CURRENT in mA Dwg. GP-052-8 3.22 2.0 3.0 4.0 5.0 6.0 7.0 8.0 INPUT VOLTAGE in VOLTS Dwg. GP-053-8 OUTPUT VOLTAGE 3.5 3.0 OUTPUT VOLTAGE in VOLTS 2.5 OUTPUT VOLTAGE in VOLTS VI = 6 V 3.31 IO = 0 2.0 3.30 1.5 I O = 0 - 100 mA TA = 25C 3.29 1.0 3.28 0.5 0 0 1.0 2.0 3.0 INPUT VOLTAGE in VOLTS 4.0 -50 0 +50 +100 AMBIENT TEMPERATURE in C Dwg. GP-059-1 Dwg. GP-050-2 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. 8187 LOW-DROPOUT, 3.3 V REGULATOR TYPICAL CHARACTERISTICS (concluded) QUIESCENT (GROUND TERMINAL) CURRENT 60 QUIESCENT (GROUND TERMINAL) CURRENT in A 50 V =6V I I =0 O QUIESCENT (GROUND TERMINAL) CURRENT in A IO = 0 50 40 TA = 85C 45 30 20 TA = 25C TA = -20C 10 40 35 -50 0 +50 +100 AMBIENT TEMPERATURE in C Dwg. GP-051-2 0 0 2.0 4.0 6.0 8.0 INPUT VOLTAGE in VOLTS Dwg. GP-058 DROPOUT VOLTAGE 0.25 LOAD TRANSIENT PERFORMANCE VI = 3.5 V to 6.5 V, CO as specified, TA = 25C 0.20 DROPOUT VOLTAGE in VOLTS 0.15 TA = 85C TA = 25C TA = -20C 3.55 V VO CO = 10 F 3.3 V 3.05 V 3.8 V VO 3.3 V 2.8 V <50 s 100 mA <600 s 0.10 C O = 1 F 0.05 IO 1 mA 0 0 25 50 75 100 125 150 OUTPUT CURRENT in mA Dwg. GP-054-1 Dwg. WP-028-1 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 0.090 0.102 0.055 0.063 0.014 0.017 1 2 3 0.084 0.090 0.035 0.047 0.059 BSC 0.014 0.019 0.017 0.022 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 2.29 2.60 1.40 1.60 0.35 0.44 1 2 3 2.13 2.29 0.89 1.20 1.50 BSC 0.36 0.48 0.44 0.56 3.00 BSC Dwg. MA-009-3 mm NOTES: 1. Lead spacing tolerance is non-cumulative. 2. Exact body and lead configuration at vendor's option within limits shown. 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 This datasheet has been downloaded from: www..com Datasheets for electronic components. |
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