RT8071D 3A, 1MHz, Synchronous Step-Down Converter General Description Features High Efficiency : Up to 95% The RT8071D is a high efficiency synchronous, step-down High Efficiency at Light Load DC/DC converter. Its input voltage ranges from 2.7V to Low R Power Switches : 69m/49m DS(ON) 5.5V that provides an adjustable regulated output voltage Fixed Frequency : 1MHz from 0.6V to V while delivering up to 3A of output current. IN No Schottky Diode Required The internal synchronous low On-resistance power Internal Compensation switches increase efficiency and eliminate the need for 0.6V Reference Allows Low Output Voltage an external Schottky diode. The switching frequency is Low Dropout Operation : 100% Duty Cycle fixed internally at 1MHz. The 100% duty cycle provides OCP, UVP, OTP low dropout operation, hence extending battery life in portable systems. Current mode operation with internal compensation allows the transient response to be Applications optimized over a wide range of loads and output capacitors. Portable Instruments The RT8071D is available in the WDFN-10L 3x3 package. Battery Powered Equipments Notebook Computers Ordering Information Distributed Power Systems RT8071D IP Phones Package Type Digital Cameras QW : WDFN-10L 3x3 (W-Type) Lead Plating System Marking Information G : Green (Halogen Free and Pb free) 5R= : Product Code Note : YMDNN : Date Code 5R=YM Richtek products are : DNN 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. Simplified Application Circuit RT8071D V IN VIN SW V OUT VCC FB Enable EN PGOOD PGOOD GND Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS8071D-01 June 2015 www.richtek.com 1RT8071D Pin Configurations (TOP VIEW) FB 1 10 EN 9 VCC 2 PGOOD 3 VIN 8 NC GND 4 7 SW 11 GND 5 6 SW WDFN-10L 3x3 Functional Pin Description Pin No. Pin Name Pin Function Feedback Input. This pin receives the feedback voltage from a resistive 1 FB voltage divider connected across the output. Supply Voltage Input. Decouple this pin to GND with at least 1F ceramic 2 VCC capacitor. 3 VIN Power Input. Decouple this pin to GND with at least 10 F ceramic capacitor. 4, 5, Ground. The exposed pad must be soldered to a large PCB and connected to GND 11 (Exposed Pad) GND for maximum power dissipation. 6, 7 SW Switch Node. Connect this pin to the inductor. 8 NC No Internal Connection. Power Good Indicator. This pin is an open drain logic output. The PGOOD will 9 PGOOD be pulled to ground when the output voltage is less than 90% of the target output voltage. 10 EN Enable Control Input. Pull high the EN pin to turn on the converter. Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS8071D-01 June 2015 2 GND