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SP6122 Datasheet(PDF) 9 Page - Sipex Corporation |
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SP6122 Datasheet(HTML) 9 Page - Sipex Corporation |
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9 / 19 page  9 Date: 10/02/04 SP6122 Low Voltage, Micro 8, PFET, Buck Controller © Copyright 2004 Sipex Corporation SP6122 VCC FFLAG VOUT ENABLE PDRV GND ISET ISENSE FFLAG VOUT RS 1.00k DS STPS2L25U Q1 ENABLE CIN 47µF Ceramic VIN +3.3V 2.2µH +1.9V ® ® 1 2 3 J1 CEN 4.7nF GND L1 COUT 470µF + R1 6.5k R2 12.5k + C1 4.7µF Ceramic 1 2 3 4 8 7 6 5 VOUT PMOS PDS6375 Figure 1. SP6122 Evaluation Board Application Schematic APPLICATION INFORMATION As an SP6122 application example, we will use the circuit from the SP6122 Evaluation Board Manual. This evaluation board uses the Sipex SP6122ACU, 1.25V adjustable PFET controller to realize a 3.3V to 1.9V step down converter. The board is opti- mized for 1A – 4A operation and has an R DS(ON) over current trip threshold of about 7A. The body of the applications section contains: • Data for the Evaluation Board • Guidelines for Component Selection • Features and Protection • Layout Guidelines • Introduction to the “Buck Cad Calculator” Spreadsheet Data For Evaluation Board The SP6122 is engineered for size and mini- mum pin count, yet has a very accurate 2.0% reference over line, load and temperature. Figure 2 data shows a typical SP6122 Evalu- ation Board Efficiency plot, with efficiencies to 88% and output currents to 4A. Load Regula- tion plot in Figure 3 shows an essentially flat response of only 3mV change for up to 4A load. Figure 4 Line Regulation illustrates a 1.90V output that varies only 4mV or 0.2% for an input voltage change from 3.0V to 5.5V. While data on individual power supply boards may vary, the capability of the SP6122 of achieving high accuracy over load and line shown here is quite impressive and desirable for accurate power supply design. 83 84 85 86 87 88 89 0 1 2 3 4 5 ILOAD (A) Figure 2. SP6122 Efficiency with V IN = 3.3V, V OUT = 1.9V. |
Similar Part No. - SP6122_04 |
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Similar Description - SP6122_04 |
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