Irvine, Calif.—Microsemi Corporation's LX8821 ultra-low dropout regulator (ULDO), which has two independently regulated outputs, can deliver 2.5 amps (ULDO) per channel for applications ranging from PC peripherals and instrumentation to battery charging circuits and power to ASIC, memory and input/output circuits.
"We designed the LX8821 for maximum efficiency," said Paul Bibeau, senior vice president and general manager of the Integrated Products Group. "Its configuration uses split supply voltage inputs which greatly reduces power dissipation by enabling operation of the regulator with a small dropout. An additional key feature is regulator stability independent of the capacitor type chosen, be it ceramic, tantalum or electrolytic."
The regulator, with a maximum dropout voltage of 0.6 V, has one fixed output (nominal 1.5 volts; internal reference is 1.25 volts, trimmed at the wafer level) and a wide-range adjustable output. Load regulation is within 0.5 percent. To maximize efficiency, the LX8821 accepts two supply voltage inputs (one to bias the chip's control circuitry, the other for the chip's power section). This configuration reduces power dissipation by operating the regulator at low dropout while providing sufficient headroom for the control logic. Thermal and short circuit current protection are integrated on-chip and operate independently for each regulator output.
The device datasheet can be secured by clicking here. The LX8821, packaged in an RoHS compliant 7-pin low-profile surface mount power package having low thermal resistance, is priced at 80 cents in 10k pieces.
Microsemi Corporation, 1-800-713-4113, www.microsemi.com