XRP6657EVB

XRP6657 1.5A 1.3MHz Synchronous Step Down Converter February 2012 Rev. 1.1.0 GENERAL DESCRIPTION EVALUATION BOARD MANUAL The XRP6657 Evaluation Board is designed to help the user evaluate the performance of the XRP6657 for use as a single Li-Ion battery Step-Down DC-DC Converter. The XRP6657 operates from 2.5V to 5.5V input, with the highest efficiency in the range 3.0V to 4.2V where the Li-Ion battery has the most energy. The XRP6657 evaluation board is a complete power supply circuit to provide ease of evaluation for the DC/DC converter performance. The Evaluation Board schematic diagram is shown in Figure 1. FEATURES  Guaranteed 1.5A Output Current  Fixed 1.3MHz Frequency PWM Operations  Up to 95% efficiency  Adjustable Output Voltage  Internal Compensation Network  No Schottky Diode Required  LDO Operation: 100% Duty Cycle  Over-current/Over-temperature Protection  “Green”/Halogen Free DFN-6 Package EVALUATION BOARD SCHEMATICS Fig. 1: XRP6657 Evaluation Board Schematics Exar Corporation 48720 Kato Road, Fremont CA 94538, USA www.exar.com Tel. +1 510 668-7000 – Fax. +1 510 668-7001 XRP6657 1.5A 1.3MHz Synchronous Step Down Converter PIN ASSIGNEMENT VFB 1 VSS_PWR 2 SW 3 6 EN XRP6657 DFN-6 5 VIN_CLN VSS_CLN 4 VIN_PWR Fig. 2: XRP6657 Pin Assignment PIN DESCRIPTION Name Pin Number VFB 1 VSS_PWR 2 SW 3 VIN_PWR 4 VIN_CLN 5 EN 6 VSS_CLN Exposed Pad Description Feedback Pin. Receives the feedback voltage from an external resistive divider across the output. Power Ground Pin. Switching node. Must be connected to inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches. Power Input Pin. Must be closely decoupled to ground pin with a 4.7µF or greater capacitor. Analog Input Pin. Must be closely decoupled to ground pin with a 4.7µF or greater capacitor. Enable Pin. >1.2V: Enables the XRP6657