RT8817A Datasheet | Richtek

® Dual-Phase PWM Controller with PWM-VID Reference General Description The RT8817A is a 2/1 phase synchronous Buck PWM controller which is optimized for high performance graphic microprocessor and puter applications. The IC integrates a Constant-On-Time (COT) PWM controller, two MOSFET drivers with internal bootstrap diodes, as well as channel current balance and protection functions including Over-Voltage Protection (OVP), Under-Voltage Protection (UVP), current limit, and thermal shutdown into the WQFN-24L 4x4 package. The RT8817A adopts RDS(ON) current sensing technique. Current limit is acplished through continuous inductorcurrent-sense, while RDS(ON) current sensing is used for accurate channel current balance. Using the method of current sampling utilizes the best advantages of each technique. The RT8817A Features external reference input and PWMVID dynamic output voltage control, in which the feedback voltage is regulated and tracks external input reference voltage. Other Features include adjustable switching frequency, internal soft-start, power good indicator, and enable functions. Ordering Information RT8817A Package Type QW : WQFN-24L 4x4 (W-Type) (Exposed Pad-Option 1) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek products are :  Ro HS pliant and patible with the current requirements of IPC/JEDEC J-STD-020.  Suitable for use in Sn Pb or Pb-free soldering processes. Marking Information 3Y= : Product Code 3Y=YM DNN YMDNN : Date Code Copyright ©2016 Richtek Technology Corporation. All rights reserved. DS8817A-00 September 2016 Features - Dual-Phase PWM Controller - Power State Indicator  1P-CCM/2P-CCM/1P-DEM/2P-DEM - Two Embedded MOSFET Drivers and Embedded Switching Boot Diode - Support 1.8V PWM-VID Interface - External Reference Input Control - PWM-VID Dynamic Voltage Control - Dynamic Phase Number Control - Lossless RDS(ON) Current Sensing for Current Balance - Internal/External Soft-Start -...