XRP6657IHB-F MaxLinear

XXRRPP66665577 11..55AA 11..33MMHHzz SSyynncchhrroonnoouuss SStteepp DDoowwnn CCoonnvveerrtteerr July 2009 Rev. 1.0.0 GENERAL DESCRIPTION EVALUATION BOARD MANUAL 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 FEATURES diagram is shown in Figure 1. 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 www.exar.com 48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 Fax. +1 510 668-7001 XXRRPP66665577 11..55AA 11..33MMHHzz SSyynncchhrroonnoouuss SStteepp DDoowwnn CCoonnvveerrtteerr PIN ASSIGNEMENT Fig. 2: XRP6657 Pin Assignment PIN DESCRIPTION Name Pin Number Description Feedback Pin. 1 VFB Receives the feedback voltage from an external resistive divider across the output. 2 Power Ground Pin. VSS PWR Switching node. 3 Must be connected to inductor. This pin connects to the drains of the internal main SW and synchronous power MOSFET switches. Power Input Pin. 4 VIN PWR Must be closely decoupled to ground pin with a 4.7F or greater capacitor. Analog Input Pin. 5 VIN CLN Must be closely decoupled to ground pin with a 4.7F or greater capacitor. Enable Pin. >1.2V: Enables the XRP6657 6 EN <0.4V:Disables the XRP6657 Do not leave this pin floating and enable the device once Vin is in the operating range. Exposed Pad Analog Ground Pin. VSS CLN ORDERING INFORMATION Refer to XRP6657s datasheet and/or www.exar.com for exact and up to date ordering information. 2009 Exar Corporation 2/6 Rev. 1.0.0