Description

The NCP81611 is a multiphase synchronous controller optimized

for new generation computing and graphics processors. The device is

capable of driving up to 4 phases and incorporates differential voltage

and phase current sensing, adaptive voltage positioning and

PWM_VID interface to provide and accurately regulated power for

computer or graphic controllers. The integrated power saving

interface (PSI) allows for the processors to set the controller in one of

three modes, i.e. all phases on, dynamic phases shedding or fixed low

phase count mode, to obtain high efficiency in light−load conditions.

The dual edge PWM multiphase architecture ensures fast transient

response and good dynamic current balance.

Features

• Compliant with NVIDIA OVR4i+ Specifications

• Supports up to 4 Phases

• 2.8 V to 20 V Supply Voltage Range:

• 250 kHz to 1.2 MHz Switching Frequency (4 Phase)

• Power Good Output

• Under Voltage Protection (UVP)

• Over Voltage Protection (OVP)

• System Over Current Protection (OCP)

• Per Phase Over Current Limiting (OCL)

• Startup into Pre−Charged Loads while Avoiding False OVP

• Configurable Load Line

• High Performance Operational Error Amplifier

• True Differential Current Balancing Sense Amplifiers for Each Phase

• Phase−to−Phase Dynamic Current Balancing

• Current Mode Dual Edge Modulation for Fast Initial Response to

Transient Loading

• Power Saving Interface (PSI)

• Automatic Phase Shedding with User Settable Thresholds

• PWM_VID and I2C Control Interface

• Compact 40 Pin QFN Package (5 x 5 mm Body, 0.4 mm Pitch)

• These Devices are Pb−Free and are RoHS Compliant

Typical Applications

• GPU and CPU Power

• Graphic Cards

• Desktop and Notebook Applications

• Docking Stations

• Power Banks