El Segundo, Calif. - International Rectifier's IR3093 is a three-phase interleaved PWM control IC that supports AMD Athlon, AMD Opteron, AMD Athlon64, and Intel VR10.X processors for applications that include desktop computer motherboards, voltage regulator modules, video graphics cards and telecom single-in-line (SIP) modules. It integrates MOSFET gate drivers, reducing parts count by 75 percent as well as solution size over competing devices, according to the company.
"The IR3093 meets the challenge of providing processor power in smaller form-factors such as BTX (balanced technology extended) with only a single pair of IRF6623 and IRF6620 DirectFET MOSFETs per phase," said Ralph Monteiro, marketing manager for DC/DC Computing Products.
The IR3093, working from a single 12-volt supply, is suitable for space-constrained systems requiring greater than 60 amps and includes a linear regulator to power the gate drivers. The regulator output voltage can be programmed to minimize switching losses and optimize efficiency. An on-chip programmable oscillator, with a frequency range of 100 kHz to 540 kHz, gives the designer additional flexibility to improve system efficiency and transient response.
Basic features include programmable soft-start and hiccup over-current protection. Current sensing is achieved with lossless inductor current sensing, which improves accuracy compared to sensing circuits measuring MOSFET on-resistance. Dual under-voltage lockout circuits and over-voltage protection ensure reliability of system voltages. A power-good output signal indicates proper operation.
The output voltage can be programmed with either a five- or six-bit voltage identification (VID) code. An adaptive voltage-positioning feature maintains the output voltage tolerance while minimizing output capacitor requirements. A patent-pending body braking circuit reduces the output capacitance requirement by an additional 25 percent, further reducing system costs.
The IR3093 is pin-compatible with the company's two-phase IR3092, giving designers the flexibility to migrate from a two-phase design to a three-phase solution with a single PCB layout. The IR3093M, in a MLPQ-48, 7-by-7 mm package, is priced at $3.10 each in 10k quantities.