National Semiconductor Unveils LM5642 Controller
National Semiconductor Corp. (Santa Clara, CA) launched its high-voltage, two-phase, synchronous switching controller, the LM5642, which is suitable for power supply designs for communications, industrial and automotive applications. The LM5642 offers a wide input-voltage range of 4.5V to 36Vin and is a low-cost, point-of-load regulator solution for distributed power architectures (DPAs).
The LM5642 operates in two modes, providing two outputs, or in bi-phase mode for a single output with twice the load current. The controller is suitable for any of the new DPAs with bus voltages such as 5V, 12V, 24V and up to 36V. It also can be combined with the company's recently announced 100V, push-pull controller (LM5030) to provide secondary post-regulation in multiple-output, isolated dc/dc power modules. The LM5642 oscillator frequency can be synchronized up or down between 150kHz and 250kHz, and the device can run at 200kHz where two controllers operate 180 degrees out of phase. Additionally, each output of the LM5642 can be set from 1.3V to 13.5V.
The LM5642 dual synchronous, switching controller in a TSSOP-28 package is available now. It is priced at $1.85 each in 1,000-unit quantities.
