The IR3837M, IR3838M and IR3839M SupIRBuck voltage regulators and trackers integrate a high performance controller with latest generation IR MOSFETs in a slim 5 x 6 mm PQFN package, and deliver 14 A, 10 A and 6 A output current respectively to achieve more than 96 percent peak efficiency. Offering increased functionality over previous generation devices, new features include single rail input voltage of 4.5 V to 16 V, external reference for margining purposes, internal digital soft-start, and external synchronization to reduce noise and EMI in multi-rails systems.

The new devices are configurable for DDR memory tracking or sequencing, and offer Power Good output for under-voltage and over-voltage detection with tracking capability to eliminate the numerous external components typically required to implement these functions with alternative solutions. A +/- 1 percent accurate 0.6 V reference  in 0-125 degrees C temperature range is also offered for very precise regulation as well  as 5 V external bias option to improve light load efficiency.  

The new devices eliminate the need for traditional dual stage POL conversion and save energy, size and cost by operating directly from 12 Vin.  While optimized for 12 V input voltage, superior efficiencies are also achieved in applications with 9.6 V, 5 V or 3.3 V input voltages. As a result of programmable switching frequencies up to 1.5 MHz and small footprint, the new voltage regulators shrink size and cost, in addition to achieving higher power density. Moreover, the common footprint of the devices provides design flexibility and allows cut-and-paste layout for fast time-to-market.    

Additional SupIRBuck features include programmable hiccup current limit, enhanced pre-bias start up, thermal protection, enable pin with  voltage monitoring capability, and -40 to 125 degrees C operating junction temperature  (Tj).  

Design Tools

Based on a designer's given input and output parameters, the SupIRBuck online tool selects suitable devices for a given application. Once basic requirements are entered, the tool allows the user  to capture schematics, create a reference design along with associated Bill of  Materials (BOM), view waveforms, and perform complex thermal and application  analysis quickly and easily to accelerate development time.  

Availability and Pricing  

Pricing for the IR3839 begins at 1.40 US Dollars each in 100,000-unit quantities. The IR3838 and IR3837 cost 1.65 US Dollars and 2.10 US Dollars each respectively in 100,000-unit quantities. Pricing for the new IRDC38(37)(38)(39) SupIRBuck  reference designs start at 94 US Dollars per kit. Production orders are available immediately.

A user friendly, interactive, web-based tool is available at http://mypower.irf.com/SupIRBuck and enables the rapid selection and simulation of selected SupIRBuck products.

Visit International Rectifier at www.irf.com