Product Description
The CMPWR161 is a micropower, low noise regulator designed specifically to filter out noise from a 5V digital supply making it ideal for noise-sensitive analog applications. The CMPWR161 delivers up to 150mA at a fixed 4.75V output. A bandgap reference bypass pin (BYP) provides low noise operation when an external capacitor is connected between this pin and ground. In addition, the CMPWR161 features an enable pin (EN) which allows the regulator to be placed into shutdown mode supporting low power and battery applications. The CMOS regulator features low quiescent current even at full load.

Features
• Excellent power supply ripple rejection for VIN-VOUT down to 110mV
• Excellent power supply ripple rejection in audible band (20Hz to 20KHz)
• Very low dropout voltage (110mV at 150mA)
• Fast transient response minimizes glitches in audible band.
• Low noise in audible band
• Guaranteed to deliver 150mA output at 4.75V output
• Low quiescent current—300µA typical
• "Zero" current shutdown mode
• 5205 compatible pin-out
• 5-lead SOT-23 package
• Lead-free version available

Applications
• 5V analog supply for audio CODEC
• Low noise power supply ideal for audio use
• Notebook computers
• Sound cards
• Motherboards
• Set top boxes