RT6222AHGJ6F Richtek

RT6222A/B TM 2.5A, 18V, 500kHz ACOT Synchronous Step-Down Converter General Description Features 4.3V to 18V Input Voltage Range The RT6222A/B is a synchronous step-down converter TM 2.5A Output Current with Advanced Constant On-Time (ACOT ) control mode. TM Advanced Constant On-Time Control The ACOT provides a very fast transient response with Fast Transient Response few external components. The low impedance internal Support All Ceramic Capacitors MOSFET supports high efficiency operation with wide input Up to 95% Efficiency voltage range from 4.3V to 18V. The proprietary circuit of 500kHz Switching Frequency the RT6222A/B enables to support all ceramic capacitors. Adjustable Output Voltage from 0.6V to 8V The output voltage can be adjusted between 0.6V and 8V. Cycle-by-Cycle Current Limit Input Under-Voltage Lockout Ordering Information Hiccup Mode Under-Voltage Protection RT6222A/B Thermal Shutdown Package Type Power Saving Mode for High Efficiency at Light J6F : TSOT-23-6 (FC) Load Lead Plating System Low Output Voltage Ripple at Light Load G : Green (Halogen Free and Pb Free) High Side Over Current Limit UVP Option RoHS Compliant and Halogen Free H: Hiccup PSM/PWM A : PSM/PWM Applications B : Force-PWM Industrial and Commercial Low Power Systems Note : Computer Peripherals Richtek products are : LCD Monitors and TVs RoHS compliant and compatible with the current require- Green Electronics/Appliances ments of IPC/JEDEC J-STD-020. Point of Load Regulation for High-Performance DSPs, Suitable for use in SnPb or Pb-free soldering processes. FPGAs, and ASICs Simplified Application Circuit RT6222A/B V BOOT VIN IN V SW OUT Enable FB EN GND Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS6222A/B-00 October 2015 www.richtek.com 1RT6222A/B Marking Information Pin Configurations (TOP VIEW) RT6222AHGJ6F 1K= : Product Code SW VIN EN 1K=DNN DNN : Date Code 6 5 4 23 RT6222BHGJ6F BOOTGND FB 1J= : Product Code 1J=DNN DNN : Date Code TSOT-23-6 (FC) Functional Pin Description Pin No. Pin Name Pin Function Bootstrap Supply for High-Side Gate Driver. Connect a 0.1 F ceramic capacitor 1 BOOT between the BOOT and SW pins. 2 GND Power Ground. Feedback Voltage Input. The pin is used to set the output voltage of the converter 3 FB via a resistive divider. The converter regulates V to 0.6V FB Enable Control Input. Connect EN to a logic-high voltage to enable the IC or to a 4 EN logic-low voltage to disable. Do not leave this high impedance input unconnected. Power Input. The input voltage range is from 4.3V to 18V. Must bypass with a 5 VIN suitable large ceramic capacitor at this pin. 6 SW Switch Node. Connect to external L-C filter. Function Block Diagram BOOT VIN V IN Reg VCC VIBIAS Min off V REF VCC UGATE OC SW Driver Control LGATE UV GND VCC Ripple GND SW SW Gen. V IN + + EN On-Time SW - Comparator FB EN Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS6222A/B-00 October 2015 2