Semtech, DC/DC Switching Regulator, SC2440

2.5 MHz, 2A Dual Output Step Down DC/DC Switching Regulator

News Release from: Semtech
19/03/2006

Semtech Corp has introduced the SC2440, a programmable 2.5 MHz, dual channel 2A integrated buck switching regulator targeted at xDSL customer premise equipment (CPE), passive optical networking (PON) modems, and network switching equipment.

The SC2440 features an input voltage range of 2.8V to 20V and can generate an output voltage as low as 0.8V. Its 2.5 MHz operating frequency reduces inductor and capacitor size for a compact power supply solution. For low noise applications, the frequency can be tuned higher than the system clock to avoid interference. Alternatively, a sync pin allows the device frequency to be synchronized with the system clock to reduce system jitter.

The device’s dual channels can operate independently at 2A each, or can be interleaved into a 4A output regulator for high current, low-voltage point-of-load designs. These dual channels operate 180 degrees out-of-phase to reduce input voltage ripple and minimize input capacitor requirements. The SC2440’s current-mode regulation provides fast transient response with simple loop compensation. It has built-in protection features such as cycle-by-cycle current limit with hiccup mode over-current protection and over-temperature shutdown. The SC2440 also includes independent soft start and power good for sequencing the dual outputs as dictated by system needs.

Other products in Semtech’s integrated switching regulator family consist of single output products with the following output currents: 1.5A (SC4517A), 2A (SC4518H) and 3A (SC4519H and SC4521).

The SC2440 is offered in a thermally enhanced 16-pin TSSOP-EDP package for high power designs. The package is lead free.