MC34271

The MC34270 and MC34271 are low power dual switching voltage regulators, specifically designed for handheld and laptop applications, to provide several regulated output voltages using a minimum of external parts. Two uncommitted switching regulators MC34270 and MC34271 feature a very low standby bias current of 5.0µA, and an operating current of 7.0 mA capable of supplying
output currents in excess of 200 mA.

MC34270 and MC34271 have three additional features. The first is an ELD Output that can be used to drive a backlight or a liquid crystal display. The ELD output frequency is the clock divided by 256. The second feature allows four additional output bias voltages, in specific proportions to V_B, one of the switching regulated output voltages. MC34270 and MC34271 allow use of mixed logic circuitry and provides a voltage bias for NChannel load control MOSFETs™. The third feature is an Enable input that allows a logic level signal to turn"off" or turn"on" both switching regulators.

Due to the low bias current specifications, MC34270 and MC34271 are ideally suited for battery powered computer, consumer, and industrial equipment where an extension of useful battery life is desirable.