RT8072 5A, 2MHz, High Efficiency Synchronous Step-Down Converter General Description Features zz z zz Integrated 50m and 35m MOSFETs The RT8072 is a high efficiency PWM step-down converter zz z zz 5A Output Current and capable of delivering 5A output current over a wide zz z zz High Efficiency Up to 95% input voltage range from 2.9V to 5.5V. zz z zz 2.9V to 5.5V Input Range The RT8072 provides accurate regulation for a variety of zz z zz Adjustable PWM Frequency : 300kHz to 2MHz loads with an 1% reference voltage at room temperature. zz z zz 0.8V 1% Reference Voltage For reducing inductor size, it provides up to 2MHz zz z zz Adjustable External Soft-Start switching frequency. The efficiency is maximized through zz z zz Power Good Indicator (WDFN-12L 3x3 Only) the integrated 50m for high side, 35m for low side zz z zz Over Current Protection MOSFETs and 250A typical supply current. zz z zz Under Voltage Protection The RT8072 features over current protection, frequency zz z zz Over Temperature Protection fold back function in shorted circuit, hiccup mode under zz z zz SOP-8 (Exposed Pad) and 12-Lead WDFN Packages voltage protection and over temperature protection. z RoHS Compliant and Halogen Free The RT8072 is available in SOP-8 (Exposed Pad) and Applications WDFN-12L 3x3 packages. z Low Voltage, High Density Power Systems z Distributed Power Systems Ordering Information z Point-of-Load Conversions RT8072 Package Type Marking Information SP : SOP-8 (Exposed Pad-Option 2) RT8072GSP QW : WDFN-12L 3x3 (W-Type) RT8072GSP : Product Number Lead Plating System RT8072 YMDNN : Date Code G : Green (Halogen Free and Pb Free) GSPYMDNN Note : Richtek products are : RoHS compliant and compatible with the current require- RT8072GQW ments of IPC/JEDEC J-STD-020. 6C= : Product Code Suitable for use in SnPb or Pb-free soldering processes. YMDNN : Date Code 6C=YM DNN Simplified Application Circuit V VIN BOOT IN RT8072 C C IN BOOT L EN LX V OUT C OUT COMP R FB1 R C RT FB C R R T FB2 C GND Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS8072-01 November 2012 www.richtek.com 1RT8072 Pin Configurations (TOP VIEW) COMP 1 12 8 FB COMP FB 2 11 PGOOD RT 2 7 GND RT SS 3 10 LX PGND 4 9 EN LX 3 6 EN LX 9 5 8 LX VIN 13 4 5 67 VIN BOOT VIN BOOT SOP-8 (Exposed Pad) WDFN-12L 3x3 Functional Pin Description Pin No. Pin Name Pin Function SOP-8 WDFN-12L 3x3 (Exposed Pad) 1 1 COMP Compensation Node. 2 -- GND Analog Ground. Chip Enable. Externally pulled high to enable and pulled low to 3 4 EN disable this chip, and it is internally pulled up to high when the pin is floating. 4 5, 6 VIN Power Input. 5 7 BOOT Bootstrap Supply for High Side Gate Driver. 6 8, 9, 10 LX Switch Node. 7 11 RT Frequency Setting. 8 12 FB Feedback Voltage Input. Power Ground. The exposed pad must be shouldered to a 13 9 PGND large PCB and connected to PGND for maximum power (Exposed Pad) dissipation. Power Good Indicator with Open Drain Output. It is high impedance when the output voltage is regulated. It is internally -- 2 PGOOD pulled low when the chip is shutdown, thermal shutdown or VIN is under UVLO threshold. -- 3 SS Soft-Start Control. Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS8072-01 November 2012 2 PGND