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TPS62403 Datasheet(PDF) 30 Page - Texas Instruments |
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TPS62403 Datasheet(HTML) 30 Page - Texas Instruments |
30 / 39 page www.ti.com L1 Vout 1400 mA : DEF _1 = 0: 1.575 V DEF _1 = 1: 1.1 V Vout 2600 mA : TPS 62401 : 1.8 V TPS 62403 : 2.8 V SW 1 FB 1 SW 2 ADJ 2 DEF _1 10 µF VIN 2.5V – 6V VIN EN_1 EN_2 MODE / DATA TPS62401/03 GND Processor V Core V I/O V Core_Sel L2 10 µF 10 µF 600 mA 400 mA 3.3 µH 10 µF Vout 1 : 1 .575V Vout 2 : 2 .8V SW 1 FB 1 SW 2 ADJ 2 DEF _ 1 10 µF 10 m F VIN 2.5V – 6V VIN EN _ 1 EN _ 2 MODE/ DATA TPS62403 GND 2.2 µH OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR) Inductor selection TPS62400 ,, TPS62401 TPS62403 SLVS681C – JUNE 2006 – REVISED DECEMBER 2006 APPLICATION INFORMATION (continued) Figure 44. Dynamic Voltage Scaling on Vout1 Controlled by DEF_1 pin Figure 45. TPS62403 1.575V/2.8V Outputs The converters are designed to operate with a minimum inductance of 1.75 µH and minimum capacitance of 6µF. The device is optimized to operate with inductors of 2.2 µH to 4.7µH and output capacitors of 10µF to 22µF. The selected inductor has to be rated for its DC resistance and saturation current. The DC resistance of the inductor will influence directly the efficiency of the converter. Therefore an inductor with lowest DC resistance should be selected for highest efficiency. Equation 6 calculates the maximum inductor current under static load conditions. The saturation current of the inductor should be rated higher than the maximum inductor current as calculated with Equation 7. This is recommended because during heavy load transient the inductor current rises above the calculated value. 30 Submit Documentation Feedback |
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