Semtech Corp. a supplier of analog and mixed-signal semiconductors for communications, portable devices, computers, and industrial equipment, introduces 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.
“The SC2440 expands our DC/DC buck switching regulator family with a dual output, flexible regulator that is ideally suited to generate point-of-load (POL), core and I/O power supplies for DSPs, FPGAs, and ASICs in consumer and telecom Applications,” said Ven Shan, Vice President of Marketing for Semtech’s Power Management Group. “Further, the merits of its high 2.5 MHz operating frequency and synchronization capability are fully exploited in XDSL applications where the power supply is synchronized above the 1.1 MHz and 2.2 MHz downstream frequency bands in ADSL and ADSL2+ modem designs, respectively, resulting in high data rate transmissions.”
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 and meets worldwide environmental requirements including the European Union’s Restriction on Hazardous Substances in Electrical Equipment (RoHS) directive.
* Generates dual output voltages for systems that employ FPGAs, embedded microprocessors, DSPs and ASICs, such as xDSL, optical networking unit/optical line termination (ONU/OLT) systems
* Generates one 4A output or two separately regulated 2A outputs
* 2.8V to 20V operating voltage range
* Fixed output voltages as low as 1V
* 88 percent efficiency
* Low quiescent and shutdown currents: 1q = 3.3mA typ.; Isd = 38μA typ.
* Sync pin allows synchronization for frequencies up to 2.5 MHz
The SC2440 is available immediately in production quantities and is priced at $1.58 each in 1,000-piece lots. Ordering code for the device is SC2440TETRT in a TSSOP-16 package. Semtech offers comprehensive design assistance, including field- and factory-based support.
Data sheets, volume pricing, and delivery quotes, as well as evaluation kits and samples, are available by contacting firstname.lastname@example.org.