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

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.

FEATUREs
• Ultra Low–Noise: 150 nV/√Hz @ 100 Hz, 40 μVRMS 100 Hz – 100 kHz Typical, Iout = 60 mA, Co = 1.0 F
• 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

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