EL7535EVAL1

USER’S MANUAL EL7535EVAL1, EL7535IY-EVAL TB448 Rev.0.00 Feb 17, 2005 Evaluation Board Using the Evaluation Board 2. Chip Enable EL7535 is a high efficiency 350mA synchronous step-down PWM regulator in a tiny MSOP10 package. The internal compensation makes it possible for the full-featured 350mA converter to occupy less than 0.18in2 of PCB area with all components on one side. When EN pin is pulled to Ground, the regulator is disabled. It consumes less than 1µA of current. R5 can be connected to VIN directly if this function is not needed, reducing the component counts. 1. Output Adjustment When powering up, the open-collector Power-On-Reset output holds low for 100ms after VO reaches the preset voltage. When a reset signal RSI is issued, POR goes to low for the same period of time while the output power is still on (Please refer to the datasheet for the timing diagram). When the function is not used, connect RSI to ground and leave R4 open, further reduce the total components counts and the overall PCB area to less than 0.18in2. 3. RSI/POR Function Use R1 and R2 to adjust output voltage according to the following formula: R 2  V O = 0.8   1 + ------- R 1  The evaluation board is set to VO = 1.8V. The POR output also serves as a 100ms delayed Power Good signal when the pull-up resister R4 is installed. The RSI pin needs to be directly (or indirectly through R6) connected to Ground for this to function properly. R1 R1 80.6K 100K 11 2 2 L1 L1 VVo O 33 1.8uH 1.8µH VVin IN GND GND C1 C1 10µF 10uF C2 C2 10uF 10µF R3 100 44 55 SGND SGND FB FB U1 U1 EL7535IY EL7535CY PGND V0 PGND V0 LX LX POR PG VIN VIN EN EN VDD VDD RSI SYNC R2 R2 10 10 100K 124K 99 88 POR PG/POR 77 EN EN 66 RSI SYNC/RSI R6 R6 100K 100K C3 0.1µF R4 R4 100K 100K R5 R5 100K 100K FIGURE 1. DEMO BOARD SCHEMATIC Evaluation Board Bill of Materials REFERENCE DESIGNATOR VALUE PACKAGE MANUFACTURER MANUFACTURER’S PART NUMBER MANUFACTURER’S PHONE NUMBER C1, C2 10µF/MLCC, X7R 1206 TDK C3216X7R1A106K 847-803-6100 C3 0.1µF 0603/0402 L1 1.8µH 1008PS-182M 847-639-6400 EL7535IY 888-ELANTEC Any Coilcraft R2 124K, 1% 0603/0402 Any R1, R4, R5, R6 100K, 1% 0603/0402 Any R3 100, 1% 0603/0402 Any U1 EL7535IY MSOP10 Intersil TB448 Rev.0.00 Feb 17, 2005 Page 1 of 3 Evaluation Board EL7535EVAL1, EL7535IY-EVAL Demo Board Layout (Actual Size - 3” x 2”) FIGURE 2. SILKSCREEN FIGURE 4. BOTTOM LAYER FIGURE 3. TOP LAYER TB448 Rev.0.00 Feb 17, 2005 Page 2 of 3 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. 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