NCP4561 datasheet(1/16 Pages) ONSEMI

Part #	NCP4561

Description	ULTRA LOW-NOISE LOW DROPOUT VOLTAGE REGULATOR WITH 1.0 ON/OFF CONTROL

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Manufacturer	ONSEMI [ON Semiconductor]

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May, 2002 – Rev. 2

1

Publication Order Number:

NCP4561/D

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

mVRMS 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

ms (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 mVRMS 100 Hz –

100 kHz Typical, Iout = 60 mA, Co = 1.0

mF

• Fast Response Time from OFF to ON: 40 ms 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

Thermal

Shutdown

On/Off

Band Gap

Reference

*Current Limit

*Antisaturation Protection

*Load Transient Improvement

Vout

Vin

GND

NC

ON/

OFF

4

5

2

3

1

TSOP–5

SN SUFFIX

CASE 483

1

5

PIN CONNECTIONS AND

MARKING DIAGRAM

1

3Vout

ON/OFF

2

GND

NC

4

Vin

5

P28 = Device Code

Y

= Year

W

= Work Week

(Top View)

Device

Voltage

Output*

Shipping

ORDERING INFORMATION

NCP4561SN28T1

2.8 V

3000/Tape & Reel

* Contact your ON Semiconductor sales

representative for other output voltage values.

http://onsemi.com

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