8188

8188 PRELIMINARY INFORMATION (subject to change without notice) July 13, 1999 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 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. 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. Data Sheet 27468.8 A8188SLT-xx 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. T C UY DL ON RO PE DC EN UE IN ER TF NE OR CR IS O DF — VR 1 2 3 GND Dwg. PS-022-2 OUT IN FEATURES AND BENEFITS I High Efficiency Provides Extended Battery Life I 90 mV Typical Dropout Voltage at IO = 60 mA I 55 µA Typical Quiescent Current Less Than 1 µA “Sleep” Current I 250 mA Peak Output Current I Improved PSRR and Transient Performance I Internal Thermal Protection APPLICATIONS I I I I 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 OUT BIAS DRIVE ERROR AMP ENABLE 7 ENABLE BANDGAP REF. 2 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 where “-xx” is the required output voltage (VO(nom)) in tenths (25 through 33), e.g., -30 = 3.0 volts. OUT 1 GND 1 A8188SL-xx 8 VR 7 6 VR 5 IN 1 1 1 2 3 4 ENABLE IN OUT 2 GND 2 2 ENABLE 2 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 25°C 50°C 70°C 85°C 1.0 500 500 500 500 1.5 500 500 490 400 2.0 500 460 370 300 2.5 460 370 295 240 3.0 385 305 245 200 4.0 285 230 185 150 5 .0 230 185 145 120 6.0 190 150 120 100 7.0* 165 130 105 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 25°C 50°C 70°C 85°C 1.0 250 250 250 250 1.5 250 250 205 165 2.0 240 190 155 125 2.5 190 155 120 100 3.0 160 125 100 80 4.0 120 95 75 60 5.0 95 75 60 50 6.0 80 65 50 40 7.0* 65 55 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 Output Voltage (reference specified VO(nom)) Output Volt. Temp. Coeff. Line Regulation Load Regulation aVO ∆VO(∆VI) ∆VO(∆IO) Symbol VO Test Conditions 4 V ≤ VI ≤ 8 V, 10 µA ≤ IO ≤ 100 mA* VI = VO(nom), IO = 60 mA VI = 6 V, IO = 10 mA, TJ ≤ 125°C 4 V ≤ VI ≤ 8 V, IO = 1 mA 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) IQ VI = 8 V, IO ≤ 1 mA, VE ≥ 2.0 V VI = 8 V, IO ≤ 100 mA*, VE ≥ 2.0 V VI = VO(nom), IO = 60 mA IQ(off) ENABLE Input Voltage VEH VEL ENABLE Input Current Thermal Shutdown Temp. Rejection Ratio IE TJ PSRR VI = VO(nom) + 1.5 V, Vi = 100 mV, IO = 10 mA: f = 1 kHz f = 10 kHz Noise en 10 Hz ≤ f ≤ 100 kHz, IO = 10 mA, CO = 10 µF — – — 60 50 2.0 — — — dB dB µV/√Hz 4 V ≤ VI ≤ 8 V, VE ≤ 0.8 V 4 V ≤ VI ≤ 8 V, Output ON 4 V ≤ VI ≤ 8 V, Output OFF VE = VI = 8 V Min. -0.05 -0.30 — — — — — — — — — — — 2.0 — — 150 Typ. 0.00 — -0.30 — — — — 90 190 55 70 200 — — — — — Max. +0.05 — — 10 40 40 40 150 300 70 85 — 1.0 — 0.8 ±1.0 — Units V V mV/°C mV mV mV mV mV mV µA µA µA µA V V µA °C 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 LOAD REGULATION +0.06 LINE REGULATION +0.03 TA = -20°C 50 mA INTERVALS +0.04 OUTPUT VOLTAGE in VOLTS +0.02 OUTPUT VOLTAGE in VOLTS +0.02 VI = 8 V VO(nom) -0.02 V =4V I +0.01 I O = 0 mA VI = 6 V VO(nom) -0.01 IO = 100 mA -0.04 TA = -20°C -0.02 -0.06 -0.03 -0.08 0 25 50 75 100 125 150 Dwg. GP-052-13 -0.04 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Dwg. GP-053-13 OUTPUT CURRENT in mA INPUT VOLTAGE in VOLTS +0.06 +0.03 TA = 25°C 50 mA INTERVALS +0.04 OUTPUT VOLTAGE in VOLTS +0.02 OUTPUT VOLTAGE in VOLTS +0.02 +0.01 IO = 0 mA V O(nom) VI = 8 V V O(nom) -0.01 -0.02 V =4V I I = 100 mA O -0.04 TA = 25°C 2 V INTERVALS -0.02 -0.06 -0.03 -0.08 0 25 50 75 100 125 150 Dwg. GP-052-14 -0.04 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Dwg. GP-053-14 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. www.allegromicro.com 8188 LOW-DROPOUT REGULATORS TYPICAL CHARACTERISTICS (cont’d) LOAD REGULATION +0.06 LINE REGULATION +0.03 TA = 85°C 50 mA INTERVALS +0.04 +0.02 OUTPUT VOLTAGE in VOLTS OUTPUT VOLTAGE in VOLTS +0.02 +0.01 V O(nom) V VI = 7 V VI = 6 V O(nom) IO = 0 mA -0.01 -0.02 -0.04 VI = 4 V -0.06 TA = 85°C -0.02 IO = 100 mA -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-053-15 INPUT VOLTAGE in VOLTS OUTPUT VOLTAGE 3.5 3.0 V O(nom) OUTPUT VOLTAGE in VOLTS +0.01 VI = 6 V IO = 0 OUTPUT VOLTAGE in VOLTS 2.5 2.0 VO(nom) -0.01 1.5 I O = 0 - 100 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-050-3 AMBIENT TEMPERATURE in °C Dwg. GP-059-2 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. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 8188 LOW-DROPOUT REGULATORS TYPICAL CHARACTERISTICS (cont’d) QUIESCENT (GROUND TERMINAL) CURRENT 250 QUIESCENT (GROUND TERMINAL) CURRENT in µA 60 VI = 6 V I O VE ≥ 2 V =0 QUIESCENT (GROUND TERMINAL) CURRENT in µA 200 IO = 0 TA = 25°C 150 55 100 50 50 45 -50 0 +50 +100 AMBIENT TEMPERATURE in °C Dwg. GP-051-3 0 -2.0 V O(nom) +2.0 +4.0 +6.0 INPUT VOLTAGE in VOLTS Dwg. GP-058-1 DROPOUT VOLTAGE 0.25 0.20 DROPOUT VOLTAGE in VOLTS 0.15 TA = 85°C TA = 25°C TA = -20°C 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 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 +0.1 V VO(nom) -0.1 V 15 µs 5 µs VO 0