Semtech Adds New High-Input Voltage Devices To Buck Converter Family
Semtech Corp. announced the SC4525A and SC4524A/B, three new step-down (buck) regulators with high input voltage and programmable frequency needed for networking and digital consumer applications.
The SC4525A is an asynchronous 3A step-down converter designed for wide input voltage range of 8.0 to 28V. The SC4524 is a 2A version of the chip with a 3V minimum input voltage and a choice of two maximum input voltage levels, 28V (A) or 16V (B). All three parts feature a programmable oscillator frequency ranging from 200kHz to 2MHz enabling system designers to not only tailor their designs for size versus cost of the external components but also reduce EMI. Two external resistors are used to set output voltages as low as 1V.
The converters are suitable for wide range of applications such as DSL modems, set top boxes, cable modems and digital TVs. The highly accurate reference voltage (±1%) makes them well suited for tightly regulated output voltages, including rails like I/O, memory and most core voltages.
All three products feature extensive protection features. In the event of short circuit or over current fault condition, the regulators offer cycle-by-cycle, frequency foldback and hiccup mode current limit. With frequency foldback protection, the devices reduce switching frequency to protect the IC and the load. The programmable soft-start not only reduces input start-up current and prevents the output from overshooting during power-up but also provides system designers with flexibility for power sequencing with different slew rates preventing latch up.
The devices are packaged in a thermally enhanced SOIC-8 package with a temperature range of -40 to +85°C, suitable for use in remote plant applications. They are RoHS and WEEE compliant.
The SC4525A is available immediately in production quantities and is priced at $0.42 each in 1,000-piece lots. The SC4524A/B are available immediately in production quantities and are priced at $0.45 each in 1,000-piece lots.
