RT6212BHGJ6F Richtek

RT6212A/B TM 2A, 18V, 500kHz, ACOT Step-Down Converter General Description Features Integrated 163m/86m MOSFETs The RT6212A/B is a high-efficiency, monolithic 4.5V to 18V Supply Voltage Range synchronous step-down DC-DC converter that can 500kHz Switching Frequency deliver up to 2A output current from a 4.5V to 18V input ACOT Control supply. The RT6212A/B adopts ACOT architecture to Feedback Reference Voltage 0.8V 1.5% allow the transient response to be improved and keep Feedback Reference Voltage 0.765V 1.5% in constant frequency. Cycle-by-cycle current limit Internal Start-Up into Pre-Biased Outputs provides protection against shorted outputs and Compact Package : TSOT-23-6 Pin soft-start eliminates input current surge during start-up. Input Under-Voltage Lockout Fault conditions also include output under-voltage Over-Current Protection and Hiccup protection, output over-current protection, and thermal shutdown. Applications Ordering Information Set-Top Boxes Portable TVs ( ) RT6212A/B Access Point Routers Package Type DSL Modems J6F : TSOT-23-6 (FC) LCD TVs Lead Plating System G : Green (Halogen Free and Pb Free) Marking Information Reference Voltage None : V = 0.8V REF RT6212AHRGJ6F 2W= : Product Code R : V = 0.765V REF DNN : Date Code 2W=DNN UVP Option H : Hiccup RT6212BHRGJ6F PSM/PWM 2V= : Product Code A : PSM/PWM DNN : Date Code 2V=DNN B : Force-PWM RT6212AHGJ6F Note : 0B= : Product Code Richtek products are : DNN : Date Code 0B=DNN RoHS compliant and compatible with the current RT6212BHGJ6F requirements of IPC/JEDEC J-STD-020. 0A= : Product Code Suitable for use in SnPb or Pb-free soldering DNN : Date Code 0A=DNN processes. Simplified Application Circuit RT6212A/B BOOT C BOOT V VIN IN C IN L LX V OUT C OUT Enable EN R1 C FF FB GND R2 Copyright 2018 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS6212A/B-07 April 2018 www.richtek.com 1 RT6212A/B Pin Configuration (TOP VIEW) EN FB BOOT 6 5 4 2 3 LX GND VIN TSOT-23-6 (FC) Functional Pin Description Pin No. Pin Name Pin Function System ground. Provides the ground return path for the control circuitry and 1 GND low-side power MOSFET. Switch node. LX is the switching node that supplies power to the output and 2 LX connect the output LC filter from LX to the output load. 3 VIN Power input. Supplies the power switches of the device. Feedback voltage input. This pin is used to set the desired output voltage via 4 FB an external resistive divider. The feedback voltage is 0.765V/0.8V typically. Enable control input. Floating this pin or connecting this pin to GND can disable 5 EN the device and connecting this pin to logic high can enable the device. Bootstrap supply for high-side gate driver. Connect a 100nF or greater 6 BOOT capacitor from LX to BOOT to power the high-side switch. Functional Block Diagram BOOT VIN VIN PVCC Reg VCC Minoff PVCC VIBIAS VREF UGATE OC LX Control Driver LGATE UV &OV GND GND LX VCC Ripple EN EN LX Gen. VIN + + On-Time LX Comparator FB Copyright 2018 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS6212A/B-07 April 2018 2 -