EL SEGUNDO, Calif. - International Rectifier, IRF today introduced two
one-percent accurate, single output, synchronous buck PWM controllers with 4.5V to 16V input voltage capability. The
new IR3637SPbF and IR3637ASPbF are compact and simple solutions for up to 15A DC-DC point-of-load applications such
as dual data rate (DDR) memory, field programmable gate arrays (FPGAs), and video graphics processors. Combined with
International Rectifier’s broad selection of power MOSFETs, these two controllers offer greater design flexibility
and improved performance versus integrated solutions.
The two PWM controllers feature a 0.8V, one percent
accurate voltage reference. In next generation systems, peripheral rails can require as little as 3% total voltage
error tolerance to ensure data signal integrity. The two new PWM ICs with one percent accuracy allow designers to
meet this stringent requirement. Both ICs include short-circuit protection, input under-voltage lockout, and an
externally programmable soft-start function. The devices are available in the standard SO-8 package.
The IR3637SPbF operates at 400kHz, suitable for output currents up to 15A for applications including
desktop motherboard peripheral rails such as DDR memory and chip set power.
IR3637ASPbF runs at 600kHz and provides optimum efficiency in applications requiring less than 7A such as FPGAs. The
600kHz operating frequency reduces required inductor size when compared to lower frequency solutions and increases
control loop bandwidth for improved transient response. Both PWM controllers are suitable for general purpose DC-DC
conversion in a variety of other switching power supply applications.
“For 12V input applications, designers have limited
choices for integrated point of load solutions. International Rectifier has put together these two new ICs with its
world class power MOSFETs to create a menu of options enabling the ‘ease of use benefits’ that
integrated solutions offer with the flexibility and performance of discrete topologies,” said Faisal Ahmad,
Marketing Manager for DC-DC Computing Products.
A list of the wide array of
compatible MOSFETs for the new PWM controllers is posted on the IR Web site.
available is the IRDC3637 Reference Design, which demonstrates performance for a 5V input, 1.8V output, DC-DC
converter delivering 7A of output current, using the IR3637SPbF. For more details, go to the International Rectifier
DC-DC Reference Designs page
|Part Number||Package||Switching Frequency||Iout||Vin||Max Duty Cycle||Reference Voltage|
15A||4V – 16V||85%||0.8|
|IR3637ASPbF||SO-8||600kHz||Up to 7A||4V – 16V||85%||0.8|
Availability and Pricing
Pricing for both the
IR3637SPbF and the IR3637ASPbF is US $0.79 each in 10,000-unit quantities, and are available either in tubes or Tape
& Reel. Prices are subject to change. The devices are lead-free and are compliant with the Restriction of
Hazardous Substances Directive (RoHS).