A8231SLM

8226 THRU 8233 PRELIMINARY INFORMATION (subject to change without notice) January 18, 2000 LOW-DROPOUT REGULATORS — HIGH EFFICIENCY Designed specifically to meet the requirement for extended operation of battery-powered equipment such as cordless and cellular telephones, the A8226SLM thru A8233SLM voltage regulators offer the reduced dropout voltage and quiescent current essential for maximum battery life. Applicable also to palmtop computers and personal data assistants, these devices deliver a regulated output at up to 100 mA (transient), which is limited only by package power dissipation. Regulated output voltages of 2.6, 2.7, 2.8, 2.9, 3.0 and 3.3 are currently provided. Other voltages, down to 2.0 volts, are available on special order. A PMOS pass element provides a typical dropout voltage of only 125 mV at 50 mA of load current. The low dropout voltage permits deeper battery discharge before output regulation is lost. Quiescent current does not increase significantly 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. The A8226SLM thru A8233SLM include ENABLE inputs to give the designer complete control over power up, standby, or power down. These devices are supplied in a thermally enhanced 5-lead smalloutline plastic package similar to the SOT-23, and fitting the SC-74A footprint. All devices are rated for operation over a temperature range of -20°C to +85°C. Data Sheet 27468.10 A82xxSLM IN OUT 4 VR 2 Dwg. PS-021-3 5 ABSOLUTE MAXIMUM RATINGS Input Voltage, VI . . . . . . . . . . . . . . . 7 V Peak Output Current, IOM . . . . . . . . . . . . . . . . . . 100 mA* Enable Input Voltage, VE . . . . . . . . . . VI Operating Temperature Range, TA . . . . . . . . . . . . . -20°C to +85°C Junction Temperature, TJ . . . . +150°C Storage Temperature Range, TS . . . . . . . . . . . . -40°C to +150°C * 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 following pages. T C UY DL ON RO PE DC EN UE IN ER TF NE OR CR IS O DF — 1 ENABLE NO CONNECT GND NC 3 FEATURES AND BENEFITS I High Efficiency Provides Extended Battery Life I 125 mV Typical Dropout Voltage at IO = 50 mA I 32 µA Typical Quiescent Current Less Than 1 µA “Sleep” Current I Low Output Noise I 100 mA Peak Output Current I Improved PSRR and Transient Performance APPLICATIONS I I I I Cordless and Cellular Telephones Personal Data Assistants Personal Communicators Palmtop Computers Always order by complete part number, e.g., A82xxSLM , where “xx” is the required output voltage in tenths. 8226 THRU 8233 LOW-DROPOUT REGULATORS FUNCTIONAL BLOCK DIAGRAM IN 5 4 OUT BIAS DRIVE ERROR AMP ENABLE 1 ENABLE BANDGAP REF. 2 GND Dwg. FS-012-5B A82xxSLM Maximum Allowable Average 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. Allowable Total Average (10 ms) Output Current in Milliamperes with TJ = 150°C, Duty Cycle = 100%† VI - VO TA 25°C 50°C 70°C 85°C 1.5 100 100 100 100 2.0 100 100 100 100 2.5 100 100 100 100 3.0 100 100 100 98 3.5 100 100 100 84 4.0* 100 100 91 74 4.5* 100 100 81 66 * Absolute maximum peak output current rating is 100 mA; absolute maximum input voltage is 7 V. † IO = (TJ – TA)/([VI – VO] RθJA x dc) = (150 – TA)/([VI – VO] x 220 x 1.00) Output current rating can be increased (to 100 mA maximum) by additional heat sinking or reducing the duty cycle. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2000, Allegro MicroSystems, Inc. 8226 THRU 8233 LOW-DROPOUT REGULATORS ELECTRICAL CHARACTERISTICS at TA = +25°C, VE ≥ 2.0 V (unless otherwise noted). Limits Characteristic Output Voltage (reference specified VO(nom)) Output Volt. Temp. Coeff. Line Regulation Load Regulation Dropout Voltage Ground Terminal Current aVO ∆VO(∆VI) ∆VO(∆IO) VImin - VO IGND IQ ENABLE Input Voltage VEH VEL ENABLE Input Current Rejection Ratio IE PSRR Symbol VO Test Conditions 4 V ≤ VI ≤ 7 V, 10 µA ≤ IO ≤ 50 mA* VI = VO(nom), IO = 50 mA VI = 6 V, IO = 10 mA, TJ ≤ 125°C 4 V ≤ VI ≤ 7 V, IO = 1 mA 1 mA ≤ IO ≤ 50 mA*, 4 V ≤ VI ≤ 7 V IO = 50 mA VI < 7 V, IO ≤ 50 mA VI ≤ 7 V, VE ≤ 0.8 V, IO = 0 mA 4 V ≤ VI ≤ 7 V, Output ON 4 V ≤ VI ≤ 7 V, Output OFF VE = VI = 7 V VI = VO(nom) + 1.5 V, Vi = 100 mV, IO = 10 mA, f = 1 kHz f = 10 kHz 10 Hz ≤ f ≤ 100 kHz, IO = 10 mA, CO = 10 µF Min. -0.05 — — — — — — — 2.0 — — Typ. 0.00 — -0.20 3.0 — 125 32 — — — — Max. +0.05 -0.25 — 10 20 250 45 1.0 — 0.8 ±1.0 Units V V mV/°C mV mV mV µA µA V V µA — — — 70 52 0.5 — — — dB dB µV/√Hz Output Noise en Typical values are at TA = +25°C and are given for circuit design information only. * Pulse test (≤20 ms). See previous page for duty cycle limitations. www.allegromicro.com 8226 THRU 8233 LOW-DROPOUT REGULATORS TYPICAL CHARACTERISTICS LOAD REGULATION +0.06 +0.03 TA = -20°C 25 mA INTERVALS LINE REGULATION +0.04 +0.02 OUTPUT VOLTAGE in VOLTS +0.02 OUTPUT VOLTAGE in VOLTS +0.01 I O = 0 mA VO(nom) -0.02 VI = 4 V V O(nom) -0.01 I = 50 mA O VI = 7 V -0.04 TA = -20°C -0.02 -0.06 -0.03 -0.08 0 10 20 30 40 50 60 Dwg. GP-052-16 -0.04 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Dwg. GP-053-17 OUTPUT CURRENT in mA INPUT VOLTAGE in VOLTS +0.06 +0.03 TA = 25°C 25 mA INTERVALS +0.04 +0.02 OUTPUT VOLTAGE in VOLTS +0.02 VI = 7 V OUTPUT VOLTAGE in VOLTS +0.01 IO = 0 mA V O(nom) -0.01 IO = 50 mA V O(nom) -0.02 V =4V -0.04 TA = 25°C I -0.02 -0.06 -0.03 -0.08 0 10 20 30 40 50 60 Dwg. GP-052-17 -0.04 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Dwg. GP-053-18 OUTPUT CURRENT in mA INPUT VOLTAGE 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 appropriate Maximum Allowable Output Current table. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 8226 THRU 8233 LOW-DROPOUT REGULATORS TYPICAL CHARACTERISTICS (cont’d) LOAD REGULATION +0.06 +0.03 LINE REGULATION +0.04 +0.02 OUTPUT VOLTAGE in VOLTS TA = 85°C OUTPUT VOLTAGE in VOLTS +0.02 +0.01 IO = 0 mA V O(nom) V O(nom) VI = 7 V VI = 6 V -0.02 -0.01 IO = 60 mA -0.04 VI = 4 V -0.06 TA = 85°C -0.02 -0.03 -0.08 0 10 20 30 40 50 60 OUTPUT CURRENT in mA Dwg. GP-052-15 -0.04 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Dwg. GP-053-16 INPUT VOLTAGE in VOLTS OUTPUT VOLTAGE 3.5 3.0 +0.02 OUTPUT VOLTAGE in VOLTS V O(nom) OUTPUT VOLTAGE in VOLTS 2.5 +0.01 2.0 VO(nom) -0.01 VI = 6 V IO = 0 1.5 I O = 0 - 50 mA TA = 25°C 1.0 -0.02 0.5 0 0 1.0 2.0 3.0 INPUT VOLTAGE in VOLTS 4.0 -50 0 +50 +100 Dwg. GP-050-4 AMBIENT TEMPERATURE in °C Dwg. GP-059-3 CAUTION: Maximum allowable duty cycle will be significantly less than 100% at high temperatures, at high input voltages, or at high output currents. See appropriate Maximum Allowable Output Current table. www.allegromicro.com 8226 THRU 8233 LOW-DROPOUT REGULATORS TYPICAL CHARACTERISTICS (cont’d) GROUND TERMINAL/QUIESCENT CURRENT 60 QUIESCENT (GROUND TERMINAL) CURRENT in µA TA = 25°C 40 VI = 6 V IO = 0 VE ≥ 2 V GROUND TERMINAL CURRENT in µA 50 I O = 50 mA 40 30 30 IO = 0 20 20 10 10 -50 0 +50 +100 AMBIENT TEMPERATURE in °C Dwg. GP-051-4 0 -2.0 V O(nom) +2.0 +4.0 +6.0 INPUT VOLTAGE in VOLTS Dwg. GP-058-2 DROPOUT VOLTAGE 50 TA = 25°C VI ≥ VO(nom) + 0.30 V 0.25 GROUND TERMINAL CURRENT in µA 45 0.20 DROPOUT VOLTAGE in VOLTS 40 0.15 TA = 25°C TA = -20°C TA = 85°C 35 0.10 30 0.05 25 20 0 20 40 60 OUTPUT CURRENT in mA Dwg. GP-071 0 0 10 20 30 40 50 60 OUTPUT CURRENT in mA Dwg. GP-054-3 CAUTION: Maximum allowable duty cycle will be significantly less than 100% at high temperatures, at high input voltages, or at high output currents. See appropriate Maximum Allowable Output Current table. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 8226 THRU 8233 LOW-DROPOUT REGULATORS TYPICAL CHARACTERISTICS (concluded) LOAD TRANSIENT PERFORMANCE VI = 3.2 V to 6.2 V, CO = 4.7 µF, TA = 25°C ENABLE TRANSIENT PERFORMANCE VI = 3.2 V to 6.2 V, CO = 1 µF, TA = 25°C +30 mV VO(nom) VO(nom) -30 mV 2 µs 2 µs VO 0