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| SPX2840 4A Low Dropout Voltage Regulator Adjustable & Fixed 3.3V FEATURES * Adjustable Output Down To 1.25V Or Fixed 3.3V * Output Current Of 4A * Low Dropout Voltage * Extremely Tight Load And Line Regulation * Current & Thermal Limiting * Standard 3-Terminal Low Cost TO-220 APPLICATIONS * Powering Intel Pentium P from +5V Supplies * Power PC Supplies * 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 SPX2840 is a low power 4A 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 for use in Powering Intel Microprocessor to convert from +5V to 3.3V supplies and as a post regulator for switching supplies applications. The SPX2840 features low dropout of a maximum 1.3 volts. The SPX2840 offers over-current limit and full protection against 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 in to the load, which increases the efficiency. The SPX2840 is offered in a 3-pin TO-220 package compatible with other 3 terminal regulators. For a 3A low dropout regulator refer to the SPX2830 data sheet. ORDERING INFORMATION TO-220-3 (U) SPX2840 1 2 3 ADJ/GND VOUT VIN Front View Rev. 10/23/00 SPX2840 ABSOLUTE MAXIMUM RATINGS Power Dissipation..........................................Internally Limited Lead Temp. (Soldering, 10 Seconds) .............................. 300C Storage Temperature Range ............................ -65 to +150C Operating Junction Temperature Range SPX2840 Control Section..........................0C to +125C SPX2840 Power Transistor........................0C to +150C Input Supply Voltage .................................................... +10V Input to Output Voltage Differential ............................. +10V ELECTRICAL CHARACTERISTICS.(NOTE 1) at IOUT = 10mA, TA=25C, unless otherwise specified. Parameter Conditions SPX2840 Min Reference Voltage 10 mA IOUT IFULLLOAD 1.5V(VIN - VOUT 7V ( Over Temperature) (VIN-VOUT) + 25V 1.5V VIN - VOUT 7V ILOAD = 10mA 15V VIN - VOUT 7V 10 mA IOUT IFULLLOAD (VIN - VOUT)=3V IOUT=IFULLLOAD , VREF=1% VIN - VOUT=5V VIN - VOUT=25V TA=125C, 1000 Hrs. TA=25C 5.5 0.3 1.238 1.225 Units Max 1.262 1.270 10 0.2 0.2 0.5 0.3 0.4 1.3 V V mA % % % % % V A A 1 % A A A %/W % dB % VO Typ 1.250 1.250 5 0.015 0.035 0.05 0.1 0.2 1.1 6.5 0.6 0.3 55 Min. Load Current Line Regulation Load Regulation Dropout Voltage Current Limit Long Term Stability Adjust Pin Current Adjust Pin Current Change Thermal Regulation Temperature Stability Ripple Rejection Ratio Output Noise, RMS 120 0.2 5 0.015 30 ms pulse 0.003 0.5 VIN - VOUT=3V IOUT =3A, COUT = 25F, CADJ = 25F, f= 120Hz 60 75 0.003 10Hz to 10kHz 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 10F output capacitor is required on SPX2840. Rev. 10/23/00 SPX2840 TYPICAL CHARACTERISTICS Rev. 10/23/00 SPX2840 TYPICAL APPLICATIONS VIN C1 R1 OUT IN VOUT C2 R1 VIN C1 IN SPX2840 ADJ OUT SPX2840 ADJ VREF LOAD VOUT = VREF (1 + R2 ) + IADJ R2 R1 R2 4A Current output Regulator Typical Adjustable Regulator Intel 486TM 3.45V VIN +5V C1 ADJ R1 IN VCC SPX2840 OUT C2 R1 TM Powering Intel Pentium with SPX2840 Pentium Processor is a trademark of Intel Corp. Power PC is a trademark of Motorola Corp. Rev. 10/23/00 SPX2840 ORDERING INFORMATION Ordering No. SPX2840AU SPX2840AU-3.3 Precision 2% 2% Output Voltage Adj 3.3V Packages 3 Lead TO-220 3 Lead TO-220 Corporation SIGNAL PROCESSING EXCELLENCE Sipex Corporation Headquarters and Main Offices: 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 935-7600 FAX: (408) 934-7500 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others. Rev. 10/23/00 |
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