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RT6236B Dataheets PDF



Part Number RT6236B
Manufacturers Richtek
Logo Richtek
Description Synchronous Step-Down Converter
Datasheet RT6236B DatasheetRT6236B Datasheet (PDF)

® RT6236A/B 6A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter General Description The RT6236A/B is a high-performance 650kHz, 6A stepdown regulator with internal power switches and synchronous rectifiers. It features quick transient response using its Advanced Constant On-Time (ACOTTM) control architecture that provides stable operation with small ceramic output capacitors and without complicated external compensation, among other benefits. The input voltage range is from 4.5V to 18V and.

  RT6236B   RT6236B


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® RT6236A/B 6A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter General Description The RT6236A/B is a high-performance 650kHz, 6A stepdown regulator with internal power switches and synchronous rectifiers. It features quick transient response using its Advanced Constant On-Time (ACOTTM) control architecture that provides stable operation with small ceramic output capacitors and without complicated external compensation, among other benefits. The input voltage range is from 4.5V to 18V and the output is adjustable from 0.7V to 8V. The proprietary ACOTTM control improves upon other fast response constant on-time architectures, achieving nearly constant switching frequency over line, load, and output voltage ranges. Since there is no internal clock, response to transients is nearly instantaneous and inductor current can ramp quickly to maintain output regulation without large bulk output capacitance. The RT6236A/B is stable with and optimized for ceramic output capacitors. With internal 51mΩ switches and 18mΩ synchronous rectifiers, the RT6236A/B displays excellent efficiency and good behavior across a range of applications, especially for low output voltages and low duty cycles. Cycle-by-cycle current limit provides protection against shorted outputs, input under-voltage lock-out, externally-adjustable soft-start, output under- and over-voltage protection, and thermal shutdown provide safe and smooth operation in all operating conditions. The RT6236A/B is available in the UQFN-13JL 2x3 (FC) package, with exposed thermal pad. Features  Fast Transient Response  Advanced Constant On-Time (ACOTTM) Control  4.5V to 18V Input Voltage Range  Adjustable Output Voltage from 0.7V to 8V  6A Output Current  51mΩ Internal High-Side N-MOSFET and 18mΩ Internal Low-Side N-MOSFET  Steady 650kHz Switching Frequency  Up to 95% Efficiency  Optimized for All Ceramic Capacitors  Externally-Adjustable, Pre-biased Compatible Soft- Start  Cycle-by-Cycle Current Limit  Input Under-Voltage Lockout  Output Over- and Under-Voltage Protection  Power Good Output  Externally-Adjustable, Pre-biased Compatible Soft- Start  Thermal Shutdown Applications  Industrial and Commercial Low Power Systems  Computer Peripherals  LCD Monitors and TVs  Green Electronics/Appliances  Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs Simplified Application Circuit VIN CIN VPVCC RPG Enable CSS RT6236A/B VIN SW BOOT PGOOD EN FB SS PVCC GND L CBOOT CFF R1 COUT VOUT VPVCC CPVCC R2 Copyright ©2018 Richtek Technology Corporation. All rights reserved. DS6236A/B-03 January 2018 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT6236A/B Ordering Information RT6236A/B Package Type QUF : UQFN-13JL 2x3 (U-Type) (FC) Lead Plating System G : Green (Halogen Free and Pb Free) H : Hiccup Mode UVP L : Latched OVP & UVP A : PSM B : PWM Note : Richtek products are :  RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free soldering processes. Pin Configuration (TOP VIEW) GND SW BOOT 13 12 11 GND 1 10 VIN EN 2 9 VIN FB 3 8 PGOOD NC 4 7 NC 56 SS PVCC UQFN-13JL 2x3 (FC) Marking Information RT6236AHGQUF 0Z : Product Code 0ZW W : Date Code RT6236BHGQUF 0X : Product Code 0XW W : Date Code RT6236ALGQUF 0Y : Product Code 0YW W : Date Code RT6236BLGQUF 0W : Product Code 0WW W : Date Code Functional Pin Description Pin No. Pin Name Pin Function 1, 13 GND Ground. 2 EN Enable control input. 3 FB Converter feedback input. Connect to output voltage feedback resistor divider. 4, 7 NC No internal connection. 5 SS Soft-start control. A external capacitor should be connected to GND. 6 PVCC 5V power supply output. A capacitor (typical 1F) should be connected to GND. 8 PGOOD Open drain power good output. 9, 10 VIN Power input and connected to high-side MOSFET drain. Bootstrap. This capacitor is needed to drive the power switch's gate above the 11 BOOT supply voltage. It is connected between SW and BOOT pins to form a floating supply across the power switch driver. A 0.1F capacitor is recommended for use. 12 SW Switch output. Copyright ©2018 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS6236A/B-03 January 2018 Functional Block Diagram PVCC BOOT VIN Reg VIBIAS PVCC VREF Min. Off PVCC UGATE OC Control Driver LGATE UV & OV GND SW PVCC SW Ripple Gen. 6µA SS FB + - Comparator 0.9 VREF FB + - VIN Comparator SW On-Time EN RT6236A/B VIN SW GND PGOOD Detailed Description The RT6236A/B is a high-performance 650kHz 6A stepdown regulators with internal power switches and synchronous rectifiers. It features an Advanced Constant On-Time (ACOTTM) control architecture that provides stable operation with ceramic output capac.


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