Linear Regulators (LDO) | NCP4561

Ultra Low-Noise Low Dropout Voltage Regulator with 1.0 V ON/OFF Control

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Overview

The NCP4561 is a Low DropOut (LDO) regulator featuring excellent noise performances. Thanks to its innovative concept, the circuit reaches an incredible 40 µVRMS, noise level without an external bypass capacitor. Housed in a small SOT-23 5 leads-like package, it represents the ideal designer's choice when space and noise are at premium.

The absence of external bandgap capacitor unleashes the response time to a wake-up signal and makes it stay within 40 µs (in repetitive mode), pushing the NCP4561 as a natural candidate in portable applications.

The NCP4561 also hosts a novel architecture which prevents excessive undershoots when the regulator is the seat of fast transient bursts, as in any bursting systems.

Finally, with a static line regulation better than -75 dB, it naturally shields the downstream electronics against choppy lines.

  • Noise Sensitive Circuits: VCOs RF Stages, etc.
  • Bursting Systems (TDMA Phones)
  • All Battery Operated Devices

  • Ultra Low-Noise: 150 nV/√Hz @ 100 Hz, 40 mVRMS
    100 Hz -100 kHz Typical, Iout = 60 mA, Co = 1.0 µF
  • Fast Response Time from OFF to ON:
    40 µs Typical at a 200 Hz Repetition Rate
  • Ready for 1.0 V Platforms: ON with a 900 mV High Level
  • Nominal Output Current of 80 mA with a 100 mA Peak Capability
  • Typical Dropout of 90 mV @ 30 mA, 160 mV @ 80 mA
  • Ripple Rejection: 70 dB @ 1.0 kHz
  • 1.5% Output Precision @ 25°C
  • Thermal Shutdown

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