RT8065ZSP Richtek

RT8065 3A, 2MHz, Synchronous Step-Down Converter General Description Features zz z zz High Efficiency : Up to 95% The RT8065 is a high efficiency synchronous, step-down z Adjustable Frequency : 200kHz to 2MHz DC/DC converter. Its input voltage range is from 2.7V to zz z zz No Schottky Diode Required 5.5V and provides an adjustable regulated output voltage zz z zz 0.8V Reference Allows Low Output Voltage from 0.8V to 5V while delivering up to 3A of output current. zz z zz Low Dropout Operation : 100% Duty Cycle The internal synchronous low on-resistance power zz z zz Enable Function switches increase efficiency and eliminate the need for zz z zz External Soft-Start an external Schottky diode. The default switching zz z zz Power Good Function frequency is set at 2MHz, if the RT pin is left open. It can zz z zz RoHS Compliant and Halogen Free also be varied from 200kHz to 2MHz by adding an external resistor. Current mode operation with external Applications compensation allows the transient response to be z LCD TV and Monitor optimized over a wide range of loads and output capacitors. z Notebook Computers z Distributed Power Systems Ordering Information z IP Phones RT8065 z Digital Cameras Package Type SP : SOP-8 (Exposed Pad-Option 2) QW : WDFN-8L 3x3 (W-Type) Marking Information Lead Plating System RT8065ZSP Z : ECO (Ecological Element with RT8065ZSP : Product Number Halogen Free and Pb free) RT8065 YMDNN : Date Code Note : ZSPYMDNN Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. RT8065ZQW Suitable for use in SnPb or Pb-free soldering processes. 29 : Product Code YMDNN : Date Code 29 YM DNN Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS8065-07 November 2012 www.richtek.com 1RT8065 Pin Configurations (TOP VIEW) 8 COMP PGOOD COMP 1 8 PGOOD 2 7 SS FB SS 2 7 FB GND 3 6 3 EN RT 6 EN RT 9 4 9 5 LX VIN 4 5 VIN LX SOP-8 (Exposed Pad) WDFN-8L 3x3 Typical Application Circuit RT8065 L V 5 IN 4 LX V VIN OUT 2.7V to 5.5V C IN R3 R1 10F 100k 7 C FB OUT 8 PGOOD PGOOD R COMP 1 R2 COMP R OSC 6 RT C COMP 9 (Exposed Pad) GND Chip Enable 3 2 EN SS C SS 10nF Table 1. Recommended Components Selection for f = 1MHz SW V (V) R1 (k) R2 (k) R (k) C (pF) L (H) C (F) OUT COMP COMP OUT 3.3 75 24 33 560 2 22 2.5 51 24 22 560 2 22 1.8 30 24 15 560 1.5 22 1.5 21 24 13 560 1.5 22 1.2 12 24 11 560 1.5 22 1 6 24 8.2 560 1.5 22 Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS8065-07 November 2012 2 GND