RT8848B Datasheet | Richtek

Description The RT8848A/B is a 8/7/6/5/4/3/2/1 multi-phase synchronous Buck controller which is optimized for high performance graphic microprocessor and support n Vidia OVR4i+ spec with PWM-VID interface. The RT8848A/B adopts AC G-NAVPTM (Green Native AVP) which is Richtek's proprietary topology derived from finite DC gain of internal GM amplifier with current mode control. By utilizing the AC G-NAVPTM topology, the operating frequency of the RT8848A/B varies with VID, load and input voltage to further enhance the efficiency even in CCM. Besides, for current sensing application, the RT8848A/B can support either a traditional DCR network current sense from inductor or a smart power stage (SPS) which can directly provide a current monitor signal (IMON). The RT8848A/B features external reference input and PWM-VID dynamic output voltage control, in which the output voltage is regulated and tracks external input reference voltage. The RT8848A/B can set internal RAMP amplitude through PINSETx pin and this can optimize stability and load transient performance. The RT8848A/B also provides plete fault protection functions including over-voltage protection (OVP), under-voltage protection (UVP), channel over-current limit (CH_OC), sum output current protection (SOC) and over-temperature protection (OTP). Features - Multi-Phase PWM Controller - PWM-VID Dynamic Voltage Control - Support 1.8V PWM-VID Interface - Power State Indicator - LPC (Low Phase Count), PSI = Low - APS (Auto Phase Shedding), PSI = Mid - HPC (High Phase Count), PSI = High - External Reference Input Control - 8/7/6/5/4/3/2/1 Phase Hardware Setting - Adjustable Soft-Start Time - Adjustable Switching Frequency - Adjustable Phase Current Balance - Support Standby Mode - UVP/OVP/OTP/SOC/CH_OC/TSEN Protection - Adjustable Protection Thresholds - Power Good Indicator - ADC Reporting for IMON, TSEN and VSEN - Support I2C Interface for Programming - Ro HS pliant and Halogen Free Applications - GPU Core Power for...