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NCP4561SN28T1MOTON/a351avaiUltra Low-Noise Low Dropout Voltage Regulator with 1.0 V ON/OFF Control


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NCP4561SN28T1
Ultra Low-Noise Low Dropout Voltage Regulator with 1.0 V ON/OFF Control
NCP4561
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 �VRMS 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 �s (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 �VRMS 100 Hz –
100 kHz Typical, Iout = 60 mA, Co = 1.0 �F Fast Response Time from OFF to ON: 40 �s 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
Figure 1. Simplified Block Diagram

Vout
Vin
GND
ON/
OFF
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