Date: 18/10/2008

Six-phase pulse width modulation controllers for servers & PCs

ON Semiconductor introduced two six-phase Pulse Width Modulation (PWM) controllers. The ADP4000 and ADP4100 satisfy the performance requirements of Intel's VR11.1 specification and enable energy efficient motherboard and graphics card designs for servers and high-end desktop computers.

Features include:

1. The features of VR11.1 helps to conserve power during light-loading in order to save energy and generate less heat than earlier industry solutions.
2. Dynamic VID transitions adjust both the processor voltage and processor frequency to switch between power/performance states.
3. Current limit protection is available with delayed latch-off function. This allows for inherent per-phase protection against faulty components.
4. Has power good monitoring feature.
5. The Fast Enhancement PWM (FEPWM) architecture used is to achieve fast turn-on during transients yet preserves the clocking system for stability.
6. FEPWM also maintains interleaving between phases even during transients for input filter power dissipation reduction.
7. The ADP4000 includes a PMBus programmable digital interface that allows designers to optimize compensation and control performance
8. Several functions can be programmed over PMBus including output voltage (VID code), output voltage offset for over-clocking, and current limit thresholds.
9. The ADP4000 supports 25 PMBus-defined commands and 38 manufacturer-specific commands.

Packaging: LFCSP-48 package (both ADP4000 & ADP4100 )
Pricing: $3.75 U.S. per unit in 2,500 unit quantities (ADP4000)
$3.45 U.S. per unit in 2,500 unit quantities (ADP4100 )

For more information, visit: http://www.onsemi.com