PRELIMINARY INFORMATION LOW-DROPOUT REGULATORS — HIGH EFFICIENCY (subject to change without notice) July 13, 1999 Designed specifically to meet the requirement for extended operation of battery-powered equipment such as cordless and cellular telephones, the A8188S— 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 250 mA (transient), which is limited only by package power dissipation. Regulated output voltages between 2.5 V and 3.3 V are trimmed at wafer probe. A8188SLT-xx 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 — GND 3 OUT 2 IN VR 1 Data Sheet 27468.8 8188 Dwg. PS-022-2 where “-xx” is the required output voltage in tenths ABSOLUTE MAXIMUM RATINGS Input Voltage, VI . . . . . . . . . . . . . . 10 V Peak Output Current, IOM . . . . . . . . . . . . . . . . . . 250 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. † Fault conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated but should be avoided. A PMOS pass element provides a typical dropout voltage of only 90 mV at 60 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 A8188SL-xx includes ENABLE inputs to give the designer complete control over power up, standby, or power down. These devices are supplied, without the ENABLE function, in a standard 3-lead SOT-89/TO-243AA small-outline plastic transistor package (suffix ‘LT’). Dual regulators (A8188SL-xx) are provided in an 8-lead SOIC package. All devices are rated for operation over a temperature range of -20°C to +85°C. FEATURES AND BENEFITS ■ High Efficiency Provides Extended Battery Life ■ 90 mV Typical Dropout Voltage at IO = 60 mA ■ 55 µA Typical Quiescent Current Less Than 1 µA “Sleep” Current ■ 250 mA Peak Output Current ■ Improved PSRR and Transient Performance ■ Internal Thermal Protection APPLICATIONS ■ ■ ■ ■ Cordless and Cellular Telephones Personal Data Assistants Personal Communicators Palmtop Computers Always order by complete part number, e.g., A8188SLT-30 . 8188 LOW-DROPOUT REGULATORS FUNCTIONAL BLOCK DIAGRAM (1/2 of A8188SL-xx shown) IN 8 1 ENABLE 7 DRIVE ERROR AMP ENABLE BIAS 2 OUT BANDGAP REF. GND Dwg. FS-012-8 Always order by complete part number: Part Number A8188SL-xx A8188SLT-xx Package 8-Lead SOIC 3-Lead SOT-89/TO-243AA RθJA 108°C/W 258°C/W A8188SL-xx where “-xx” is the required output voltage (VO(nom)) in tenths (25 through 33), e.g., -30 = 3.0 volts. 8 IN 2 7 ENABLE OUT 2 3 6 IN GND 2 4 5 ENABLE 2 OUT 1 1 1 VR GND 1 1 2 VR Dwg. PS-023 NOTE — There is an indeterminate resistance between terminals 2 and 4. For proper operation, terminals 2 and 4 must be externally connected together. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1999, 2000 Allegro MicroSystems, Inc. 8188 LOW-DROPOUT REGULATORS A8188SL-xx Maximum Allowable Total 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 1.0 1.5 2.0 2.5 3.0 4.0 5 .0 6.0 7.0* 25°C 500 500 500 460 385 285 230 190 165 50°C 500 500 460 370 305 230 185 150 130 70°C 500 490 370 295 245 185 145 120 105 85°C 500 400 300 240 200 150 120 100 85 * Absolute maximum peak output current rating for either output is 250 mA; absolute maximum input voltage is 10 V. † IO = (TJ – TA)/([VI – VO] RθJA x dc) = (150 – TA)/([VI – VO] x 108 x 1.00) Output current rating can be increased (to 250 mA maximum per output) by additional heat sinking or reducing the duty cycle. Conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated but should be avoided. A8188SLT-xx 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. Allowable Average (10 ms) Output Current in Milliamperes with TJ = 150°C, Duty Cycle = 100%† VI - VO TA 1.0 1.5 2.0 2.5 3.0 4.0 5.0 6.0 7.0* 25°C 250 250 240 190 160 120 95 80 65 50°C 250 250 190 155 125 95 75 65 55 70°C 250 205 155 120 100 75 60 50 40 85°C 250 165 125 100 80 60 50 40 35 * Absolute maximum input voltage is 10 V. † IO = (TJ – TA)/([VI – VO] RθJA x dc) = (150 – TA)/([VI – VO] x 258 x 1.00) Output current rating can be increased (to 250 mA maximum) by additional heat sinking or reducing the duty cycle. Conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated but should be avoided. www.allegromicro.com 8188 LOW-DROPOUT REGULATORS ELECTRICAL CHARACTERISTICS at TA = +25°C (unless otherwise noted). Limits Characteristic Symbol Output Voltage VO (reference specified VO(nom)) Output Volt. Temp. Coeff. aVO Test Conditions Min. Typ. Max. Units 4 V ≤ VI ≤ 8 V, 10 µA ≤ IO ≤ 100 mA* -0.05 0.00 +0.05 V VI = VO(nom), IO = 60 mA -0.30 — — V VI = 6 V, IO = 10 mA, TJ ≤ 125°C — -0.30 — mV/°C Line Regulation ∆VO(∆VI) 4 V ≤ VI ≤ 8 V, IO = 1 mA — — 10 mV Load Regulation ∆VO(∆IO) 1 mA ≤ IO ≤ 100 mA*, VI = 8 V — — 40 mV 1 mA ≤ IO ≤ 100 mA*, VI = 6 V — — 40 mV 1 mA ≤ IO ≤ 100 mA*, VI = 4 V — — 40 mV IO = 60 mA — 90 150 mV IO = 125 mA* — 190 300 mV VI = 8 V, IO ≤ 1 mA, VE ≥ 2.0 V — 55 70 µA VI = 8 V, IO ≤ 100 mA*, VE ≥ 2.0 V — 70 85 µA VI = VO(nom), IO = 60 mA — 200 — µA IQ(off) 4 V ≤ VI ≤ 8 V, VE ≤ 0.8 V — — 1.0 µA VEH 4 V ≤ VI ≤ 8 V, Output ON 2.0 — — V VEL 4 V ≤ VI ≤ 8 V, Output OFF — — 0.8 V VE = VI = 8 V — — ±1.0 µA 150 — — °C f = 1 kHz — 60 — dB f = 10 kHz – 50 — dB — 2.0 — µV/√Hz Dropout Voltage Quiescent Current VImin – VO IQ (GND terminal current) ENABLE Input Voltage ENABLE Input Current IE Thermal Shutdown Temp. TJ Rejection Ratio Noise PSRR en VI = VO(nom) + 1.5 V, Vi = 100 mV, IO = 10 mA: 10 Hz ≤ f ≤ 100 kHz, IO = 10 mA, CO = 10 µF 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. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 8188 LOW-DROPOUT REGULATORS TYPICAL CHARACTERISTICS LINE REGULATION +0.06 +0.03 +0.04 +0.02 OUTPUT VOLTAGE in VOLTS OUTPUT VOLTAGE in VOLTS LOAD REGULATION +0.02 VI = 8 V VI = 6 V VO(nom) -0.02 V =4V I -0.04 TA = -20°C -0.06 TA = -20°C 50 mA INTERVALS +0.01 I O = 0 mA VO(nom) IO = 100 mA -0.01 -0.02 -0.03 -0.04 -0.08 0 25 50 75 125 100 2.0 150 3.0 4.0 5.0 7.0 6.0 Dwg. GP-053-13 +0.06 +0.03 +0.04 +0.02 OUTPUT VOLTAGE in VOLTS OUTPUT VOLTAGE in VOLTS Dwg. GP-052-13 +0.02 V VI = 8 V O(nom) -0.02 V =4V I -0.04 TA = 25°C -0.06 8.0 INPUT VOLTAGE in VOLTS OUTPUT CURRENT in mA TA = 25°C 50 mA INTERVALS +0.01 IO = 0 mA V O(nom) -0.01 I = 100 mA O -0.02 -0.03 2 V INTERVALS -0.04 -0.08 0 25 50 75 100 125 150 2.0 3.0 4.0 5.0 6.0 7.0 8.0 INPUT VOLTAGE in VOLTS OUTPUT CURRENT in mA Dwg. GP-052-14 Dwg. GP-053-14 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 8188 LOW-DROPOUT REGULATORS TYPICAL CHARACTERISTICS (cont’d) LINE REGULATION +0.06 +0.03 +0.04 +0.02 OUTPUT VOLTAGE in VOLTS OUTPUT VOLTAGE in VOLTS LOAD REGULATION +0.02 V O(nom) VI = 7 V VI = 6 V -0.02 -0.04 VI = 4 V TA = 85°C -0.06 TA = 85°C 50 mA INTERVALS +0.01 V O(nom) IO = 0 mA -0.01 -0.02 IO = 100 mA -0.03 -0.04 -0.08 0 10 20 30 50 40 60 2.0 OUTPUT CURRENT in mA 3.0 4.0 5.0 6.0 7.0 8.0 INPUT VOLTAGE in VOLTS Dwg. GP-053-15 Dwg. GP-052-15 OUTPUT VOLTAGE 3.5 V O(nom) OUTPUT VOLTAGE in VOLTS OUTPUT VOLTAGE in VOLTS 3.0 2.5 2.0 1.5 I O = 0 - 100 mA 1.0 TA = 25°C VI = 6 V +0.01 IO = 0 VO(nom) -0.01 -0.02 0.5 0 0 1.0 2.0 3.0 4.0 -50 0 +50 +100 AMBIENT TEMPERATURE in °C INPUT VOLTAGE in VOLTS Dwg. GP-059-2 Dwg. GP-050-3 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 8188 LOW-DROPOUT REGULATORS TYPICAL CHARACTERISTICS (cont’d) QUIESCENT (GROUND TERMINAL) CURRENT QUIESCENT (GROUND TERMINAL) CURRENT in µA QUIESCENT (GROUND TERMINAL) CURRENT in µA 250 60 VI = 6 V I =0 O VE ≥ 2 V 55 50 45 -50 0 +100 +50 200 IO = 0 TA = 25°C 150 100 50 0 -2.0 V O(nom) AMBIENT TEMPERATURE in °C +2.0 +4.0 +6.0 INPUT VOLTAGE in VOLTS Dwg. GP-058-1 Dwg. GP-051-3 DROPOUT VOLTAGE 0.25 DROPOUT VOLTAGE in VOLTS 0.20 TA = 85°C TA = 25°C TA = -20°C 0.15 0.10 0.05 0 0 25 50 75 100 125 150 OUTPUT CURRENT in mA Dwg. GP-054-2 CAUTION: Maximum allowable duty cycle will be significantly less than 100% at high temperatures, at high input voltages, or at high output currents. See appropriate Maximum Allowable Output Current table. www.allegromicro.com 8188 LOW-DROPOUT REGULATORS TYPICAL CHARACTERISTICS (concluded) LOAD TRANSIENT PERFORMANCE ENABLE TRANSIENT PERFORMANCE VI = 3.2 V to 6.2 V, CO = 4.7 µF, TA = 25°C VI = 3.2 V to 6.2 V, CO = 1 µF, TA = 25°C +0.1 V VO(nom) VO(nom) -0.1 V 15 µs 5 µs VO 0 <100 µs <150 µs VI 100 mA VE IO 1 mA 0 Dwg. WP-028-2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Dwg. WP-027-3 8188 LOW-DROPOUT REGULATORS A8188SL-xx Dimensions in Inches (for reference only) 8 0.0098 0.0075 0.1574 0.1497 0.020 0.013 0.2440 0.2284 1 0.050 0.050 0.016 0° TO 8° BSC 0.1968 0.1890 0.0688 0.0532 0.0040 MIN. Dwg. MA-007-8 in Dimensions in Millimeters (controlling dimensions) 8 0.25 0.19 4.00 3.80 0.51 0.33 6.20 5.80 1.27 1 BSC 1.27 0.40 0° TO 8° 5.00 4.80 1.75 1.35 0.10 MIN. NOTES: 1. Lead spacing tolerance is non-cumulative. 2. Exact body and lead configuration at vendor’s option within limits shown. www.allegromicro.com Dwg. MA-007-8 mm 8188 LOW-DROPOUT REGULATORS A8188SLT-xx 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 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. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 8188 LOW-DROPOUT REGULATORS this page is intentionally left blank www.allegromicro.com 8188 LOW-DROPOUT REGULATORS 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