Ye7 ALPHA S - SEMICONDUCTOR ~ Excellence i in Analog Power Products AS2880 FEATURES Adjustable Output Down to 1.2V or Fixed 3.3V & 5V Output Current of 8A Low Dropout Voltage Extremely Tight Load and Line Regulation Current & Thermal Limiting Standard 3-Terminal Low Cost TO-220 e Similar to Industry Standard LT1083/LT1584 8A Low Dropout Voltage Regulator Adjustable & Fixed 3.3V APPLICATIONS e Powering Intel Pentium uP from +5V Supplies Power PCSupplies e SMPS Post-Regulator High Efficiency Green Computer Systems High Efficiency Linear Power Supplies Portable Instrumentation Constant Current Regulators e Adjustable Power Supplies Battery Charger PRODUCT DESCRIPTION The ALPHA Semiconductor AS2880 is a low power 8A Adjustable Voltage Regulator that is very easy to use. It requires only 2 external resistors to set the output voltage. This device is an excellent choice when using Powering Intel Microprocessor to convert from +5V to 3.3V supplies, and as a post regulator for switching supplies applications. The AS2880 features low dropout of a maximum 1.5 volts. The AS2880 offers full protection against over-current faults, reversed input polarity, reversed load insertion, over temperature operation, and positive and negative transient voltage. On-Chip trimming adjusts the reference voltage to 1%. The Ig of this device flows into the load, which increases efficiency. The AS2880 is offered in a 3-pin TO-220 package compatible with older 3-terminal regulators. When using ALPHA Semiconductor design, processing and testing techniques make AS2880 superior over similar products on the market. For a 5A low dropout regulator refer to the AS2850 datasheet. ORDERING INFORMATION TO-220 3-PIN AS2880AU X = Output Voltage (.e. 3.3 for 3.3V, 5.0 for 5.0V etc.) PIN CONNECTIONS Y = Output Tolerance, A for 1% Blank for 2% Consult factory for other fixed voltages. TO-220-3 (U) ALPHA AS2880 1 2 3 ADI/GND Vou. Vin Front View ALPHA Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 8/10/99ABSOLUTE MAXIMUM RATINGS Power Dissipation...........ccscccccsesseceesnteeeeees Internally Limited Lead Temp. (Soldering, 10 Seconds) ............ccsesscceeeenees 300C Storage Temperature Range ..........cceeeseeeeees -65 to +150C Operating Junction Temperature Range AS2880 Control Section ............eeeeeeeeeeee OC to +125C AS2880 Power Transistor.............:.eeeeeee OC to +150C Input Supply Voltage AS2880 Input to Output Voltage Differential ........ eee 8.8V ELECTRICAL CHARACTERISTICS (Note 1) at Inur= 10mA, T, = 25C, unless otherwise specified. Parameter Conditions AS2880A AS2880 Units Typ Min Max Min Max 3.3V Version Output Voltage (Note 2) | AS2880-3.3V, O<Iourl.5A, 3.3 3.270 3.330 3.230 3.370 Vv 4.75V<SVins7V 3.3 3.240 3.360 3.201 3.399 5.0V Version Output Voltage (Note 2) | AS2880-3.3V, O<Iourl.5A, 5.0 4.950 5.050 4.900 5.100 6.5V<Vins7V 5.0 4.900 5.100 4.650 5.150 All Voltage Options Reference Voltage 10mA < Tour $ Iputttoap 1.250 1.238 1.262 1.238 1.262 Vv 3.3V<(Vin - Vour)S Vin max Vour max 1.250 1.225 1.270 1.225 1.270 Mid Load Current (Vin- Vout) = Vin max Vout MAX 5 10 10 mA Line Regulation 1.5V <Vin - Vout = Vin max VourMAx 0.015 0.2 0.2 % TLoap = 10mA 0.05 0.5 0.5 Load Regulation 10mA < Tour $ Iputttoap 0.1 0.3 0.3 % (VIn - Vour)=3V 0.2 0.4 0.4 Dropout Voltage Tout=IFULLLOAD : AVrer=1% 1.1 1.2 1.2 Vv Current Limit Vin - Vout=5V 9.5 8.0 8.0 A Long Term Stability Ta=125C, 1000Hrs. 0.3 1 1 % Adjust Pin Current Ta=25C 55 90 90 HA Adjust Pin Current 0.2 5 5 HA Change Thermal Regulation 30ms pulse 0.003 0.01 0.01 IW Temperature Stability 0.5 % Ripple Rejection Ratio Vin - Vout=3V 75 60 60 dB Tout =3A, Coutr= 25uF, Capr= 25uF, f= 120Hz Output Noise, RMS 10Hz to 10kHz 0.003 % No Thermal Resistance TO-220 Junction to Tab 2.7 2.7 C/W Junction-to-Case Junction to Ambient 0.65 0.65 The Bold specifications apply to the full operating temperature range. Note 1: Changes in output voltage due to heating effects are covered under the specification for thermal regulation. Note 2: A 10,F output capacitor is required on AS2880 ALPHA Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 8/10/99TYPICAL CHARACTERISTICS LOAD REGULATION Abe BBS PN CHUTE We Tae BEMIAT Bd a) eo a 33 2 $ 25 MS 1 we TERPERATRAE (5) ADJUSTMENT PIN CURRENT Se yi os StF & au ig ADSUSTIOENT PIN CORREMT {83 2 8 6 & A wo HS is TEMERATUIRE PC) TEMPERATURE STABILITY oyh ue e 8 AEPERENCE VOLTAGE (i bee & Se BR Te es TEMPERATURE 3 SHORT ORGLIY CURRENT {Ay MIREMAIM OPERATING CURRENT REEMA INPLILOQUTPUT CHRSERENTIAL NA AS2880 _ SHORT CIRCUIT CURRENT f %E 8 & BB INPUT OWA DIP GAENAL 2} DROPOUT VOLTAGE FEST: a AG 3 Te TEPD Pests es @ 3 28 8? E et om Ge SRESUE CARRERE BS MINIMUM OPERATING CURRENT 4 B z Si ae f 8 1 RM @ 38 INSUTRTRLT SPREE ALPHA Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 8/10/99TYPICAL APPLICATIONS ALPHA IN AS2880 OUT Vin 1 Cc L ADI > R, LOAD 8A Current Output Regulator ALPHA Vin +5V IN AS28830 Cy IH AS2880 ALPHA ouT Vx @ I TN] -AS2880 Cc L ADI Vout = Veer +B ) + Taps Ro Ri Typical Adjustable Regulator Powering Intel Pentium with AS2880 Pentium Processor is a trademark of Intel Corp. Power PC is a trademark of IBM Corp. ALPHA Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 8/10/99