New Industry Products

SCG Intros MC33765-3.0 Low-Noise LDO Regulator

July 14, 1999 by Jeff Shepard

Motorola Semiconductor Components Group (SCG, Phoenix, AZ) announced the MC33765-3.0, an ultra low-noise very low dropout five-output voltage regulator chip for use in small, portable wireless communications applications. The new regulator features five independent 3V outputs. By having five independent voltage regulators housed in a single package, designers can eliminate multiple packages in designs that require more than one regulator, according to SCG. This enables access to the voltage sources to be centralized around one package, which reduces the number of interconnecting PCB tracks, thereby minimizing stray inductances. The MC33765-3 offers low dropout performance at operating voltages as low as 3V, which is claimed to extend useful battery life well below those designs using regulators with higher dropout ratings. The outputs are separately switched so that the RF stages for trading off between transmit and receive modes can be controlled. Each of the device's five outputs exhibit a noise voltage of only 40uV RMS from 100Hz to 100kHz. Each output of the regulator is 3V typical, but is capable of supplying different currents up to 150mA for output 4. It also features a very low dropout voltage (0.11V typical at maximum output current) and a very low quiescent current (5uA maximum OFF mode with no load., 130uA typical in ON mode with no load). Additionally, each voltage regulator for the MC33765 has its own independent enable pin with a common enable pin to shut down the complete circuit when not used. The MC33765 is available in TSSOP16 surface-mount packages with samples and production quantities now available. Pricing in quantities of 10,000 is suggested at $1.80.