RT6242AHGQUF Richtek

RT6242A/B TM 12A, 18V, 500kHz, ACOT Synchronous Step-Down Converter General Description Features 4.5V to 18V Input Voltage Range The RT6242A/B is a synchronous step-down converter TM 12A Output Current with Advanced Constant On-Time (ACOT ) mode control. TM 12m Internal High-Side N-MOSFET and 5.4m The ACOT provides a very fast transient response with Internal Low-Side N-MOSFET few external components. The low impedance internal Advanced Constant On-Time Control MOSFET supports high efficiency operation with wide Fast Transient Response input voltage range from 4.5V to 18V. The proprietary circuit Support All Ceramic Capacitors of the RT6242A/B enables to support all ceramic Up to 95% Efficiency capacitors. The output voltage can be adjustable between Adjustable Switching Frequency from 300kHz to 0.7V and 8V. The soft-start is adjustable by an external 700kHz capacitor. Adjustable Output Voltage from 0.7V to 8V Adjustable Soft-Start Ordering Information Pre-bias Start-Up RT6242A/B Adjustable Current Limit from 6A to 16A Package Type Cycle-by-Cycle Over Current Protection QUF : UQFN-16JL 3x3 (U-Type) (FC) Power Good Output Lead Plating System G : Green (Halogen Free and Pb Free) Input Under-Voltage Lockout Hiccup Mode Under-Voltage Protection UVP Option H : Hiccup Mode UVP Thermal Shutdown Protection L : Latched OVP & UVP A : PSM Applications B : 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 RT6242A/B V SW OUT V VIN IN BOOT EN Signal EN FB Power Good RT PGOOD PVCC RLIM SS GND Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS6242A/B-04 March 2016 www.richtek.com 1RT6242A/B Pin Configurations Marking Information RT6242AHGQUF (TOP VIEW) 7D= : Product Code YMDNN : Date Code 7D=YM 16 15 14 13 DNN 1 12 AGND SW 2 11 FB SW 3 PVCC 10 SW RT6242ALGQUF RT 4 9 BOOT 7C= : Product Code 5 6 7 8 YMDNN : Date Code 7C=YM DNN UQFN-16JL 3x3 (FC) RT6242BHGQUF 78= : Product Code YMDNN : Date Code 78=YM DNN RT6242BLGQUF 75= : Product Code YMDNN : Date Code 75=YM DNN Functional Pin Description Pin No. Pin Name Pin Function 1 AGND Analog Ground. Feedback Voltage Input. It is used to regulate the output of the converter to a set 2 FB value via an external resistive voltage divider. The feedback reference voltage is 0.7V typically. Internal Regulator Output. Connect a 1F capacitor to GND to stabilize output 3 PVCC voltage. 4 An External Timing Resistor Adjusts the Switching Frequency of the Device. RT Soft-Start Time Setting. An external capacitor should be connected between this 5 SS pin and GND. Power Input. The input voltage range is from 4.5V to 18V. Must bypass with a 6 VIN suitably large ( 10F x 2) ceramic capacitor. 7 GND Ground. 8 PGOOD Power Good Indicator Open-Drain Output. Bootstrap. This capacitor is needed to drive the power switch s gate above the supply voltage. It is connected between SW and BOOT pins to form a floating 9 BOOT supply across the power switch driver. A 0.1F capacitor is recommended for use. 10 to 14 SW Switch Node. Connect this pin to an external L-C filter. Enable Control Input. A logic-high enables the converter a logic-low forces the IC 15 EN into shutdown mode reducing the supply current to less than 10A. 16 RLIM An External Resistor Adjusts the Current Limit of the Device. Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS6242A/B-04 March 2016 2 SS RLIM VIN EN SW GND SW PGOOD