Camarillo, Calif.—Semtech Corp.'s SC452 and SC454 PWM controllers meet the core-supply drive requirements for notebook computers that incorporate Intel Centrino Duo mobile technology.
The SC452 and SC454, the company's sixth generation of Intel-based controllers, are IMVP-6 compliant and are the latest devices stemming from Semtech's developer's agreement with Intel. The single-phase SC454, in a 5-by-5 mm MLP and working from a 5-volt input (as with the SC452), is suited to driving 30-amp (external) MOSFETs. The dual-phase SC452, for 55-amp applications, can power the full voltage range of Centrino Duo platform-based notebooks. This controller leverages Intel protocols to seamlessly switch between single and dual-phase operation. The SC452 is provided in an MLP7x7-44pin (7-by-7 mm) package. Both devices are lead-free and RoHS compliant.
The SC452 and SC454 utilize the company's Smart Drive technology, which lowers ringing on the phase node and high-side FET gate node to keep efficiency high while reducing EMI and eliminating the need for snubbers or gate resistors. Additionally, the SC452's current sensing system is based on the company's Combi-Sense technology, which eliminates the need for external sense resistors, thus keeping efficiency high and reducing cost.
The SC452 and SC454 have a very fast hysteretic voltage regulation scheme; transient response is less than 10 microseconds. The use of hysteretic topology ensures a stable output with minimal output capacitance. Both devices have a complete set of protection mechanisms including programmable current limit, output over-voltage protection, input under-voltage lockout and over-temperature protection.
Click here for the SC452's basic description; and here for the SC454's. E-mail firstname.lastname@example.org to request the datasheets. The SC452 and the SC454 are available in production quantities. The SC452 is priced at $3.12 each in 1,000-piece lots; the SC454 is priced at $2.12 each. Semtech offers comprehensive design assistance, including field- and factory-based support.
Semtech Corp., 1-805-498-2111, www.semtech.com