Controller IC Chip - MOSFET Rt8870A chip for laptop - Integrated Laptop Chip (Ref.1-CHIP0980)

Controller IC Chip - MOSFET Rt8870A chip for laptop- Integrated portable calculator chip(SKU.1-CHIP0980)

Dual-Output PWM Controller for AMD SVI Mobile CPU Power Supply

The RT8870A is a dual-output PWM controller for AMD SVI mobile CPU power supply. The RT8870A provides a two-phase PWM controller to power the CPU Core (VDD) and a single-phase PWM controller to power the Northbridge portion of the CPU (VDDNB). This part has three integrated MOSFET drivers and is fully compliant with AMD Voltage Regulator Specification to meet AMD’s mobile CPU power supply requirements. The RT8870A features CCRCOT (Constant Current Ripple Constant On-Time) control with G-NAVPTM (Green-Native AVP), which is a Richtek proprietary topology. The CCRCOT control provides superior output voltage ripple performance over the entire input/output range. G-NAVPTM makes this device an easy setting controller to meet the droop requirement for all AMD mobile CPUs. The droop is easily programmed by setting the DC gain of the error amplifier. with proper compensation, the load transient response can achieve optimized AVP performance. The droop function is selectable for both VDD and VDDNB outputs. The RT8870A uses Serial VID Interface (SVI) for individual controller output voltage and operation mode programming. A built-in high-accuracy DAC converts the serial VID code for output voltage ranging from 0.5V to 1.55V with up to 0.8% system accuracy. This device supports VID on-the-fly and operation mode transition onthe-fly functions that are fully compliant with the AMD specification. Both VDD and VDDNB controllers provide diode emulation mode to improve efficiency at light load condition. The RT8870A supports inductor DCR and sense resistor current sensing. It also provides power good indication and complete fault protection functions, including over voltage, out-of-spec, negative voltage, over current and under voltage lockout thermal shutdown. The RT8870A is available in a WQFN-40L 5x5 small footprint package

z Dual-Output PWM Controller for AMD CPU Core and NB Power z G-NAVPTM (Green-Native AVP) z Constant Current Ripple Constant-On-Time (CCRCOT) Control z Fast Line/Load Transient Response z Integrated MOSFET Drivers z 0.8% DAC Accuracy z Serial VID Interface (SVI) ` Two-Wire Clock and Data Bus ` High Speed I2 C ` 7-bit DAC : 0.5V to 1.55V with 12.5mV Step z Support Power Saving Mode (PSI_L) ` Phase Shedding and Diode Emulation in VDD Output ` Diode Emulation in VDDNB Output z Support VFIX Mode z Selectable Droop Function z Differential Remote Voltage Sensing z Accurate Current Balance z Digital Soft-Start/ Soft-Shutdown for All Outputs z OVP, Out-Of-Spec, NVP, OCP, OTP and UVLO z 40-Lead WQFN Package z RoHS Compliant and Halogen Free

Please check the IC Number and match with your existing Product.

When you receive before using it.

Please confirm the chip you received is brand new as described,if you suspect the chip is not new or not as described. Please don't use it and contact us immediately.

Please make sure you have advanced soldering skill to solder the chips that you will order.

Once it has been used, no return will be accepted.