Date: 15/09/2009

Maxim's single-phase step-down controller for NVIDIA graphics processors units

Maxim has introduced the MAX17409, a single-phase step-down controller that powers NVIDIA graphics processors units (GPUs) and is suitable for 2- to 4-Li+ cells battery to processor, Core supply converters, GPU core supplies, notebooks/desktops/servers, voltage-positioned step-down converter applications.

The MAX17409 active voltage positioning lowers the output voltage in response to the load current, reducing output capacitance requirements and power dissipation. The load current is sensed at the output to minimize noise sensitivity, and can be sensed using a current-sense resistor or the DC resistance of the inductor.

Other key features are,

Adjustable switching frequency (600kHz max)
±6mV VOUT accuracy over line, load, and temperature
6-Bit graphics DAC (12.5mV LSB)
Active voltage positioning with adjustable gain
Accurate droop and current limit, Remote output and ground sense
Buffered 2V reference output for offsets
Power-good window comparator, Temperature comparator
Drives large synchronous rectifier FETs, 2V to 26V power input range
Output overvoltage and undervoltage protection
Soft-startup and soft-shutdown
Internal boost diodes

Operating temperature range: -40°C to +105°C

Package: 4mm x 4mm, 28-pin TQFN package
Price: Starts at $4.36 for 1k pieces
For more details visit www.maxim-ic.com