Microsemi Introduces Dual PWM Controller For Multi-Voltage Systems
Microsemi Corp. announced production of its LX1752(tm) dual PWM controller optimized for systems requiring multiple low voltage, high current power supplies in set-top box, broadband modem, digital television, and data center equipment applications.
The company states that these systems deploy sophisticated digital integrated circuits and processors which draw large currents at low voltages and require power supply circuitry with superior transient response. Microsemi says that its LX1752 controller provides this transient performance while offering advanced features for simplified system design. In addition, the controller’s synchronous rectification is said to provide higher power conversion efficiency necessary in addressing today’s green initiatives.
The product features single supply voltage operation of 4.5 to 22V; independent programmable power sequencing control; programmable PWM frequency range 180kHz to 1.6MHz; and PWM outputs operation out of phase.
The LX1752 controller’s single supply voltage is said to simplify system power circuitry while saving bill of materials costs by combining the IC’s operating supply with the supply for power conversion. Independent programmable power sequencing control is said to simplify the device power sequencing often required in systems using sophisticated digital integrated circuits or processors. PWM frequency and soft start times are also programmable. The controller drives N-channel MOSFETs with output currents up to 13A.
When using the LX1752 controller’s dual outputs, or when cascading multiple devices, PWM outputs are operated out of phase to reduce system noise, input cap capacitance and cost. For single device operation, the outputs are 180% out of phase, whereas in dual implementation the outputs are 90% out of phase.
"Our new LX1752 dual controller solves power management problems that system designers face using complex analog and digital ICs," said Richard Johnson, DC/DC Product Line manager at Microsemi’s Analog Mixed Signal Group. "By working closely with our customers, and taking a system perspective, we can offer superior performance while reducing their bill of materials costs. The LX1752 also joins our successful LX1675(tm) triple PWM controller in Microsemi’s power management portfolio."
The LX1752 controller is in production in an RoHS compliant 28-pin, 4 x 5 x1mm QFN package. Pricing in 10,000 unit quantities is $0.86.
