RT8099/A 1.5MHz, 600mA, High Efficiency PWM Step-Down Converter General Description Features 2.7V to 5.5V Input Range The RT8099/A is a Pulse-Width-Modulated (PWM) DC/ Adjustable Output from 0.7V to 5V DC step-down converter, and is capable of delivering 0.6A 0.6A Output Current output current over a wide input voltage range from 2.7V 95% Efficiency to 5.5V. The RT8099/A is ideally suited for portable No Schottky Barrier Diode Required electronic devices that are powered from 1-cell Li-ion 1.5MHz Spread Spectrum/Fixed Frequency PWM battery such as cellular phones, PDAs and handy- Operation terminals. Internal synchronous rectifier with low R DS(ON) Auto Discharge Function dramatically reduces conduction loss at PWM mode. No Over-Current Protection external schottky barrier diode is required in practical Overt-Temperature Protection application. Integrated Soft-Start Function The RT8099/A enters low-dropout mode when normal Small 6-Lead UDFN Package PWM cannot provide regulated output voltage by RoHS Compliant and Halogen Free continuously turning on the high-side P-MOSFET. The RT8099/A enters shut-down mode and consumes less Applications than 0.1A when the EN pin is pulled low. The switching Cellular Telephones ripple is easily smoothed-out by small package filtering Personal Information Appliances elements due to 1.5MHz high switching frequency. Other Wireless and DSL Modems features include soft-start, auto discharge, lower internal MP3 Players reference voltage, over-temperature protection, and over- Portable Instruments current protection. The RT8099/A is available in the small UDFN-6L 1.6x1.6 Marking Information package for saving PCB space. RT8099GQU 0U : Product Code W : Date Code 0UW Simplified Application Circuit RT8099/A L VIN V BAT V LX OUT C IN FB C Enable EN OUT GND AGND PGND Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS8099/A-00 October 2013 www.richtek.com 1RT8099/A Ordering Information Pin Configurations RT8099/A (TOP VIEW) Package Type QU : UDFN-6L 1.6x1.6 (U-Type) EN 1 6 FB 2 5 Lead Plating System AGND VIN 7 3 4 PGND LX G : Green (Halogen Free and Pb Free) RT8099 : Spread Spectrum UDFN-6L 1.6x1.6 RT8099A : Fixed Frequency Note : Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Functional Pin Description Pin No. Pin Name Pin Function 1 EN Enable Control Input (Active High). 2 AGND Analog Ground. 3 PGND Power Ground. 4 LX Switch Node. 5 VIN Power Input. 6 FB Feedback Voltage Input. Ground. The exposed pad must be soldered to a large PCB and connected to 7 (Exposed Pad) GND GND for maximum power dissipation. Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS8099/A-00 October 2013 2 GND