Diodes AP6502/AP6503 buck converters

Diodes has introduced a pair of integrated synchronous DC/DC buck converters. The AP6502 and AP6503 are designed for consumer electronics systems, such as digital TV, LCD monitors and set-top boxes, that require ultra-efficient voltage conversion.

Capable of handling continuous load currents of up to 2 or 3 A respectively, the devices can support 12 and 5 V bus systems and achieve efficiency rates up to 95%. The output voltage is set using an external resistor divider which can accommodate any output voltage setting down to 0.925 V.

With a switching frequency of 340 kHz and incorporating low RDSON, high- and low-side power MOSFETS that reduce the need for external components, both devices offer space saving.

In addition, the parts include an external, programmable soft start control input that reduces excess current during initial power-up of the application. The combination of Enable and programmable SoftStart helps in systems requiring power sequencing. Integrated over current protection (OCP) and thermal shutdown features stabilise the system and ensure long-term reliability.