ADP123AUJZ-R7

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1. DESCRIPTION

The ADP122/ADP123AUJZ-R7 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 ADP123AUJZ-R7 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/ADP123AUJZ-R7 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/ADP123AUJZ-R7 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/ADP123AUJZ-R7 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.

2. FEATURES

    1. Input voltage supply range: 2.3 V to 5.5 V

    2. 300 mA maximum output current

    3. Fixed and adjustable output voltage versions

    4. Very low dropout voltage: 85 mV at 300 mA load

    5. Low quiescent current: 45 µA at no load

    6. Low shutdown current: <1 µA

    7. Initial accuracy: ±1% accuracy

    8. Up to 31 fixed-output voltage options available from 1.75 V to 3.3 V

    9. Adjustable-output voltage range 0.8 V to 5.0 V (ADP123)

  10. Excellent PSRR performance: 60 dB at 100 kHz

  11. Excellent load/line transient response

  12. Optimized for small 1.0 μF ceramic capacitors

  13. Current limit and thermal overload protection

  14. Logic controlled enable

  15. Compact packages: 5-lead TSOT and 6-lead 2 mm × 2 mm LFCSP

3. APPLICATIONS

    1. Digital camera and audio devices

    2. Portable and battery-powered equipment

    3. Automatic meter reading (AMR) meters

    4. GPS and location management units

    5. Medical instrumentation

    6. Point-of-sale equipment