Synchronous Buck Converter meets CPU requirements.

Press Release Summary:

Model FAN53168 multi-phase, DC-to-DC PWM controller and Model FAN53418 synchronous, MOSFET driver work together to form multi-phase synchronous buck converter. To meet tight VRM/VRD10 loadline, FAN53168 uses temperature-compensated inductor current sensing. Unit combines high-speed control loop with active voltage positioning to meet CPU load transient requirements. FAN53168/FAN53418 chipset allows regulator to scale to 2, 3, or 4 phases and can provide over 120 A output.

Original Press Release:

Fairchild's VRM10 Power Solution Meets Stringent CPU Requirements

Dual-Sourced Parts Provide Supply Chain Reliability

San Jose, Calif.-July 16, 2003-Fairchild Semiconductor (NYSE: FCS), a leader in power management solutions, today announced a VRM/VRD10-compliant power solution for high-performance microprocessors. Fairchild's latest power management products, the FAN53168, a multi-phase DC-to-DC PWM controller, and the FAN53418, a synchronous MOSFET driver, work together to form a highly accurate, efficient multiphase synchronous buck converter. This converter meets rigorous VRM/VRD10 power specifications-including tight "loadline" requirements-while reducing system costs and part count. In a move that dramatically increases the reliability of the supply chain, the FAN53168 and FAN53418 are offered as 100% pin-compatible second sources to the ADP3168 and ADP3418, respectively. The chipset is currently available in volume production.

To meet the tight VRM/VRD10 loadline, the FAN53168 uses temperature-compensated inductor current sensing--providing tight accuracy at the lowest system cost. Most competing products use MOSFET RDS(on), or sense resistors to measure current and set the loadline, a solution that is less accurate and more costly. The FAN53168's architecture combines a highly stable, high-speed control loop with active voltage positioning (droop) to meet CPU load transient requirements while minimizing the number of output capacitors and their associated costs. Additionally, the FAN53168/ FAN53418 chipset allows the regulator to scale to 2, 3, or 4 phases and can provide over 120A output to accommodate future VRM10.x CPUs. For additional safety and reliability, the controller features "on-the-fly" Voltage Identification (VID) support, undervoltage, overvoltage crowbar, and short-circuit protection, along with a Power Good output flag.

"As a pin-compatible second source to the ADP3168 and ADP3418, the Fairchild chipset provides customers with true VRM/VRD10 compliance and increased reliability of the supply chain. This greatly reduces risk, especially during the critical volume ramp for VRM/VRD10 systems," said Abid Hussain, Fairchild's product marketing manager for computing power management.

The FAN53168 is available in a 28-lead TSSOP package and the FAN53418 is available in an 8-lead SOIC package. Both devices are rated for operation from 0º to +85ºC.

The FAN53168 and FAN53418 further expand Fairchild's CPU core power management solutions that include integrated and standalone controllers, drivers, as well as standard MOSFETs and SyncFETTM MOSFETs in leaded packages and high performance FLMP and BGA packages.

Price: FAN53168 (28-lead TSSOP): US$ 1.60 (1000 pcs)
FAN53418 (8-lead SOIC): US$ 0.70 (1000 pcs)
Availability: Now
Delivery: 8 weeks ARO

For more information on other Fairchild products, design tools, and sales contacts, please visit Additional information on Fairchild's VRM 10 solution is available at:

Fairchild Semiconductor:
Fairchild Semiconductor (NYSE: FCS) is a leading global supplier of high performance products for multiple end markets. With a focus on developing leading edge power and interface solutions to enable the electronics of today and tomorrow, Fairchild's components are used in computing, communications, consumer, industrial and automotive applications. Fairchild's 10,000 employees design, manufacture and market power, analog & mixed signal, interface, logic, and optoelectronics products from its headquarters in South Portland, Maine, USA and numerous locations around the world. Please contact us on the web at

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