EL7554IRE-EVAL

USER’S MANUAL EL7554IRE-EVAL TB418 Rev.1.00 Nov 14, 2003 Evaluation Board Introduction The EL7554 is a high efficiency full-featured synchronous 4A step-down regulator. This document lists the completed schematic diagram and BOM, as well as the layout. With components on one side of the PCB, the complete converter occupies less than 0.58in2 of space. Please refer to the datasheet for the application of features. This demo board is preset to 1.8V for VO and operates at 600kHz switching frequency. The measured crossover frequencies are around 50kHz with the compensation values. Circuit Diagram U1 R0 C0 0.018µF 2.32K C1 OPEN C2 0.018µF R2 R1 10.2K 12.7K VTJ C4 0.018µF L1 VOUT TM 10.2K R6 10.2K R5 SEL 2.2µH C5 47µF GND 1 CC SGND 28 2 VREF COSC 27 C7 220pF C11 OPEN C12 OPEN 3 FB STN 26 STN 4 VO STP 25 STP 5 VTJ EN 24 EN 6 TM PG 23 7 SEL PG C8 VDD 22 0.22µF 8 LX VIN 21 9 LX VIN 20 10 LX VIN 19 11 LX PGND 18 12 LX PGND 17 13 LX PGND 16 14 NC NC 15 C9 10µF R4 OPEN C10 10µF VIN GND LX EL7554IRE TB418 Rev.1.00 Nov 14, 2003 Page 1 of 4 Evaluation Board EL7554IRE-EVAL TABLE 1. DEMO BOARD BILL OF MATERIAL DESIGNATOR VALUE PACKAGE C0, C2, C4 0.018µF 0603 Any X5R or X7R C5 47µF 1210 TDK C7 220pF 5% 0603 Any 5% MLCC C8 0.22µF 0603 Any X5R or X7R C9, C10 10µF 1206 Any X5R or X7R R0 2.32K/1% 0603 Any R1 12.7K/1% 0603 Any R2, R5, R6 10.2K/1% 0603 Any L1 2.2µH U1 EL7554IRE HTSSOP-28 MANUFACTURER PHONE # PART NUMBER C3225X5R0J476M TDK 847-803-6100 RLF7030-2R2M5R4 Intersil 888-INTERSIL EL7554IRE The output voltage can be as high as the input voltage minus the PMOS and inductor voltage drops. Use R1 and R2 to set the output voltage according to the following formula: R 1  V O = V FB   1 + ------- R 2  Where VFB=0.8V When the resisters are changed, please change the compensation capacitor C0 and resister R0. For the convenience, standard values of R1 and R2 are listed in Table 2. R5 and R6 can be eliminated if voltage margin feature is not used. Connect TM and SEL pins directly to ground. The layout accommodates 1206, 1210, 1812, and D-size package for C5. TABLE 2. FEEDBACK RESISTER AND COMPENSATION VALUES VO (V) C0 (pF) R0 (k) R1 (k) R2 (k) 0.8 0.018µF 1.02 0 Open 1 0.018µF 1.27 2.49 10 1.2 0.018µF 1.54 4.99 10 1.5 0.018µF 1.91 10 11.5 1.8 0.018µF 2.32 12.7 10.2 2.5 0.018µF 3.24 21.5 10 3.3 0.018µF 4.22 36 11.5 TB418 Rev.1.00 Nov 14, 2003 Page 2 of 4 Evaluation Board EL7554IRE-EVAL Demo Board Layout TOP SILKSCREEN TOP LAYER TB418 Rev.1.00 Nov 14, 2003 BOTTOM LAYER Page 3 of 4 Notice 1. Descriptions of circuits, software and other related information in this document are provided only to illustrate the operation of semiconductor products and application examples. You are fully responsible for the incorporation or any other use of the circuits, software, and information in the design of your product or system. Renesas Electronics disclaims any and all liability for any losses and damages incurred by you or third parties arising from the use of these circuits, software, or information. 2. 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