RT6266GSP Richtek

RT6266 2.4A, 36V, 100kHz Asynchronous Step-Down Converter with Load Line Compensation General Description Features The RT6266 is a high-efficiency, monolithic 2% High Accuracy Feedback Voltage asynchronous step-down DC/DC converter that can 7.5V to 36V Input Voltage Range deliver up to 2.4A output current from a 7.5V to 36V 2.4A Continuous Output Current (2.7A Peak) input supply. The RT6266s current mode architecture CC/CV Mode Control with internal compensation is optimized for 5V car Adjustable Load Line Compensation charger application over a wide range of loads and Short Circuit Protection output capacitors. Cycle-by-cycle current limit provides Integrated N-MOSFET Switches protection against shorted outputs and soft-start Current Mode Control eliminates input current surge during start-up. The Fixed Frequency Operation : 100kHz RT6266 also provides output over voltage protection Programmable Output Current Limit output under voltage protection and thermal shutdown 110m Internal Power MOSFET Switch protection. The low current (<3A) shutdown mode Lowe EMI signature provides output disconnect, enabling easy power Up to 95% Efficiency management in battery-powered systems. The RT6266 Cycle-by-Cycle Over Current Protection is available in a SOP-8 (Exposed Pad) package. Input Under Voltage Lockout Output Under Voltage Protection Ordering Information Thermal Shutdown Protection RT6266 Package Type Applications SP: SOP-8(Exposed Pad-Option 2) USB Power Supplies Lead Plating System Automotive Cigarette Lighter Adapters G : Green (Halogen Free and Pb Free) Power Supply for Linear Chargers Note : DC/DC Converters with Current Limited Richtek products are : Marking Information RoHS compliant and compatible with the current RT6266GSP : Product Number requirements of IPC/JEDEC J-STD-020. YMDNN : Date Code RT6266 Suitable for use in SnPb or Pb-free soldering processes. GSPYMDNN Simplified Application Circuit C BOOT L1 R C SENSE OUT V OUT D1 V VIN SW IN RT6266 R1 C BOOT GND IN R EN EN CSP R2 FB CSN Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS6266-00 March 2015 www.richtek.com 1 RT6266 Pin Configurations (TOP VIEW) 8 VIN SW 2 7 BOOT GND GND 3 6 EN CSP 9 4 5 FB CSN SOP-8 (Exposed Pad) Functional Pin Description Pin No. Pin Name Pin Function Input Supply Voltage, 7.5V to 36V. Must bypass with a suitably large ceramic 1 VIN capacitor. Bootstrap for High-Side Gate Driver. Connect 0.1F or greater ceramic 2 BOOT capacitor from BOOT to SW pins. Enable Input Pin. A logic high enables the converter a logic low forces the 3 EN RT6266 into shutdown mode reducing the supply current to less than 3A. Attach this pin to VIN with a 100k pull up resistor for automatic startup. Feedback Input Pin. This pin is connected to the converter output. It is used to set the output of the converter to regulate to the desired value via an external 4 FB resistive voltage divider. For an adjustable output, an external resistive divider is connected to this pin. Current Sense Negative Input. It is used for load current limiting and load line 5 CSN drop compensation. Current Sense Positive Input. It is used for load current limiting and load line 6 CSP drop compensation. 7, Ground. The exposed pad must be soldered to a large PCB and connected to GND 9 (Exposed Pad) GND for maximum power dissipation. (Connect the exposed pad to Pin 7) 8 SW Switch Output -- Connect to external L-C filter and Schottky diode. Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS6266-00 March 2015 2