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Date: 13-02-12

Digital PWM controllers meets Intel VR12 and VR12.5 and AMD SVI1 and SVI2 specs

International Rectifier has introduced six new digital PWM controllers meeting Intel VR12 and VR12.5 and AMD SVI1 and SVI2 specifications, and support multiphase designs from 1 to 8 phases operating 1 to 2 loops.

The features include:
Features phase shedding and variable gate drive with enhanced algorithms including PID scaling (when shedding phases) and phase current balancing.

Supports the extremely high di/dt transients from high-end processors, and, as a result of a new Adaptive Transient Algorithm (ATA), the transients can be met with fewer phases and fewer capacitors to shrink system size.

For protection of high-end circuits, the devices offer improved pulse-by-pulse current limit protection, controlled pulse width limiting a new phase imbalance/phase missing fault feature.

The devices fully support phase doubling using IR's IR3598 to drive two phases from each PWM output. The devices also sense 12V, 5V and 3.3V supplies without special sequencing and feature PMBUS telemetry.

Part Number Package Pins Vcc # Voltage
Total #
Voltage 1:
# Phases
Voltage 2:
# Phases
IR3570A QFN 5x5mm - 40 Pin 3.3V 2 1 - 3Ø 0 - 2Ø
IR3564A QFN 5x5mm - 40 Pin 3.3V 2 1 - 4Ø 0 - 1Ø
IR3565A QFN 6x6mm - 48 Pin 3.3V 2 1 - 4Ø 0 - 2Ø
IR3566A QFN 7x7mm - 56 Pin 3.3V 2 1 - 6Ø 0 - 1Ø
IR3567A QFN 7x7mm - 56 Pin 3.3V 2 1 - 6Ø 0 - 2Ø
IR3563A QFN 7x7mm - 56 Pin 3.3V 1 1 - 8Ø n/a

"By offering the highest efficiency and smallest footprint, the new CHiL /\0line-up continues to underline IR's leadership position in providing versatile VR solutions for leading-edge CPU and GPU designs for servers, motherboards and graphics cards. Supporting designs from 1 to 8 phases, the new family offers flexible phase configurations that allow customers to vary the number of phases on each voltage loop to optimize cost and efficiency for each load," said Deepak Savadatti, Vice President and General Manager, IR's Enterprise Power Business Unit.

Price: Pricing ranges from US $2.20 for the IR3570A to US $3.58 for the IR3563A in 1,000 unit quantities. Prices are subject to change.


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