AS2880 8A Low Dropout Voltage Regulator Adjustable & Fixed 3.3V FEATURES APPLICATIONS • 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 • Similar to Industry Standard LT1083/LT1584 • Powering Intel Pentium µP from +5V Supplies • Power PCSupplies • SMPS Post-Regulator • High Efficiency “Green” Computer Systems • High Efficiency Linear Power Supplies • Portable Instrumentation • Constant Current Regulators • Adjustable Power Supplies • Battery Charger PRODUCT DESCRIPTION The 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 IQ 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 (i.e. 3.3 for 3.3V, 5.0 for 5.0V etc.) Y = Output Tolerance, A for 1% Blank for 2% Consult factory for other fixed voltages. PIN CONNECTIONS TO-220-3 (U) AS2880 1 2 3 ADJ/GND VOUT VIN Front View Rev. 10/11/00 AS2880 ABSOLUTE MAXIMUM RATINGS Power Dissipation..........................................Internally Limited Lead Temp. (Soldering, 10 Seconds) .............................. 300°C Storage Temperature Range ............................ -65° to +150°C Operating Junction Temperature Range AS2880 Control Section ............................0C° to +125°C AS2880 Power Transistor..........................0C° to +150°C Input Supply Voltage .................................................... +10V Input to Output Voltage Differential .............................. 8.8V ELECTRICAL CHARACTERISTICS (Note 1) at IOUT = 10mA, TA = 25°C, unless otherwise specified. Parameter Conditions Typ AS2880A Min Max AS2880-3.3V, 0≤IOUT1.5A, 4.75V≤VIN≤7V 3.3 3.3 3.270 3.240 3.330 3.360 3.230 3.201 3.370 3.399 AS2880-3.3V, 0≤IOUT1.5A, 6.5V≤VIN≤7V 5.0 5.0 4.950 4.900 5.050 5.100 4.900 4.650 5.100 5.150 1.250 1.250 5 0.015 0.05 0.1 0.2 1.1 1.238 1.225 1.262 1.270 10 0.2 0.5 0.3 0.4 1.2 1.238 1.225 1.262 1.270 10 0.2 0.5 0.3 0.4 1.2 8.0 Min AS2880 Max Units 3.3V Version Output Voltage (Note 2) 5.0V Version Output Voltage (Note 2) All Voltage Options Reference Voltage V V Dropout Voltage 10mA ≤ IOUT ≤ IFULLLOAD 3.3V≤(VIN - VOUT )≤ VIN MAX – VOUT MAX (VIN- VOUT) = VIN MAX – VOUT MAX 1.5V ≤VIN - VOUT ≤ VIN MAX – VOUT MAX ILOAD = 10mA 10mA ≤ IOUT ≤ IFULLLOAD (VIN - VOUT)=3V IOUT=IFULLLOAD , ∆VREF=1% Current Limit VIN - VOUT=5V 9.5 Long Term Stability TA=125°C, 1000Hrs. 0.3 1 1 % Adjust Pin Current TA=25°C 55 90 90 µA 0.2 5 5 µA 0.003 0.01 0.01 %/W Mid Load Current Line Regulation Load Regulation Adjust Pin Current Change Thermal Regulation 30ms pulse Temperature Stability Ripple Rejection Ratio Output Noise, RMS Thermal Resistance Junction-to-Case 75 % V A 8.0 % 0.5 VIN - VOUT=3V IOUT =3A, COUT = 25µF, CADJ = 25µF, f= 120Hz 10Hz to 10kHz TO-220 Junction to Tab Junction to Ambient mA % 60 dB 60 0.003 2.7 0.65 2.7 0.65 % VO °C/W 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 10µF output capacitor is required on AS2880 Rev. 10/11/00 AS2880 TYPICAL CHARACTERISTICS Rev. 10/11/00 AS2880 TYPICAL APPLICATIONS VIN IN AS2880 C1 OUT VIN OUT IN C2 C1 ADJ ADJ R1 LOAD R1 Typical Adjustable Regulator AS2880 3.45V VCC OUT C2 C1 ADJ R1 Intel PentiumTM IN +5V VREF R2 VOUT = VREF 1+ R2 + IADJ R2 R1 8A Current Output Regulator VIN VOUT AS2880 R2 Powering Intel PentiumTM with AS2880 Pentium Processor is a trademark of Intel Corp. Power PC is a trademark of IBM Corp. Rev. 10/11/00