Date: 15/10/2009

PWM controllers from IR for DDR3 memory modules

IR has introduced the IR3522/IR3506, an XPhase chipset ICs that provides a power solution for DDR3 multiphase memory applications. The IR3522/IR3506 chipset enables accurate tracking with the additional flexibility of margining between the VDDQ and Vtt outputs through the I²C interface.

The IR3522 dual output PWM controller with built-in I²C interface provides system control for both the DDR3 VDDQ and Vtt rails. The device interfaces with any number of IR3506 phase ICs to drive phases to power DDR3 dual in-line memory modules (DIMMS), simplifying layout, reducing board space, and system cost.

"The new Xphase solution for DDR3 applications delivers a power supply that is smaller, more flexible and easier to design while providing higher efficiency from light load to full load when compared to conventional approaches. The IR3522 combines the best of both worlds: precision of analog control combined with programmability of power management functions via I²C to implement a simple but smart memory power supply," said Omar Hassen, executive director, IR's Multiphase Products, Enterprise Power Business Unit.

The key features of the IR3522 are,

Set point accuracy of +/-0.5%(VDDQ)
I²C interface programs the Vtt tracking ratio ± 25 % and provides digital ON/OFF control.
Four I²C addresses are selectable using 2 ADDR pins while four different VREF1 voltages are selectable using 2 VID pins if I²C communication is not available.
Soft-stop turn-off to ensure VDDR and Vtt tracking featured to a fault activated Crowbar pin to drive external NMOS devices for external output voltage protection.
Features a set of protection features with Xphase ICs including over-current, over-voltage, open remote sense, and open control.

And the key features of the IR3506 are,

Features 7V/2A gate drivers (4A GATE L sink current) and supports loss-less inductor current sensing.
A soft-stop turn-off to ensure VDDR and Vtt tracking.
Offer over-current protection during PSI assertion mode operation, integrated boot-strap synchronous PFET, debugging function, self-calibration of PWM ramp, current sense amplifier, and current share amplifier and single-wire bidirectional average current sharing.
GateH Source/Sink: 2A/2A, GateL Source/Sink: 2A/4A

Package:
IR3522: 32pin 5x5 MLPQ package
IR3506: 16pin 3x3 MLPQ package

Price:
IR3522TRPBF: Starts at each $1.90 for 10k pieces
IR3506TRPBF: Starts at each $0.90 for 10k pieces

Availability: Now

For more details visit www.irf.com

Editorial Product Rating: Average