General Description

The MIC5250 is an efficient, precise dual CMOS voltage regulator optimized for ultra-low-noise applications. The MIC5250 offers better than 1 initial accuracy, extremely low dropout voltage (typically 150mV at 150mA) and constant ground current over load (typically 100µA). The MIC5250 provides a very-low-noise output, ideal for RF applications where quiet voltage sources are required. A noise bypass pin is also available for further reduction of output noise.

Designed specifically for hand-held and battery-powered devices, the MIC5250 provides TTL logic compatible enable pins. When disabled, power consumption drops nearly to zero.

The MIC5250 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices.

Features

• Ultralow dropout—100mV @ 100mA

• Ultralow noise—30µV(rms)

• Stability with ceramic, tantalum, or aluminum electrolytic capacitors

• Load independent, ultralow ground current

• 150mA output current

• Current limiting

• Thermal Shutdown

• Tight load and line regulation

• “Zero” off-mode current

• Fast transient response

• TTL-Logic-controlled enable input

Applications

• Cellular phones and pagers

• Cellular accessories

• Battery-powered equipment

• Laptop, notebook, and palmtop computers

• PCMCIA VCC and VPP regulation/switching

• Consumer/personal electronics

• SMPS post-regulator/dc-to-dc modules

• High-efficiency linear power supplies