ADI ADP122AUJZ-2.5-R7

The ADP122/ADP123 are low quiescent current, low dropout linear regulators. They are designed to operate from an input voltage between 2.3 V and 5.5 V and to provide up to 300 mA of output current. The low 85 mV dropout voltage at a 300 mA load improves efficiency and allows operation over a wide input voltage range. The low 170 μA of quiescent current at full load makes the ADP122 ideal for battery-operated portable equipment. The ADP122 is capable of 31 fixed output voltages from 1.75 V to 3.3 V. The ADP123 is the adjustable version of the device and allows the output voltage to be set between 0.8 V and 5.0 V by an external voltage divider. The ADP122/ADP123 are specifically designed for stable operation with tiny 1 μF ceramic input and output capacitors to meet the requirements of high performance, space constrained applications. The ADP122/ADP123 have an internal soft start that gives a constant start-up time of 350 μs. Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP122/ADP123 are available in a tiny, 5-lead TSOT package and 6-lead LFCSP package for the smallest footprint solution to meet a variety of portable applications.

• Input voltage supply range: 2.3 V to 5.5 V
• 300 mA maximum output current
• Fixed and adjustable output voltage versions
• Very low dropout voltage: 85 mV at 300 mA load
• Low quiescent current: 45 μA at no load
• Low shutdown current: < 1 μA
• Initial accuracy: ±1% accuracy
• Up to 31 fixed-output voltage options available from 1.75 V to 3.3 V
• Adjustable-output voltage range 0.8 V to 5.0 V (ADP123)
• Excellent PSRR performance: 60 dB at 100 kHz
• Excellent load/line transient response
• Optimized for small 1.0 μF ceramic capacitors
• Current limit and thermal overload protection
• Logic controlled enable
• Compact packages: 5-lead TSOT and 6-lead 2 mm × 2 mm LFCSP

• Digital camera and audio devices
• Portable and battery-powered equipment
• Automatic meter reading (AMR) meters
• GPS and location management units
• Medical instrumentation
• Point-of-sale equipment