NCP4561 Datasheet, PDF (1/16 Pages) ON Semiconductor – ULTRA LOW-NOISE LOW DROPOUT VOLTAGE REGULATOR WITH 1.0 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 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, C_o = 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
ON/
OFF ¹
On/Off
NC
3
Band Gap
Reference
Thermal
Shutdown
GND
*Current Limit
*Antisaturation Protection
*Load Transient Improvement
2
Figure 1. Simplified Block Diagram
5 ^Vin
4 ^Vout
http://onsemi.com
5
1
TSOP–5
SN SUFFIX
CASE 483
PIN CONNECTIONS AND
MARKING DIAGRAM
ON/OFF 1
GND 2
5 V_in
NC 3
4 V_out
(Top View)
P28 = Device Code
Y = Year
W = Work Week
ORDERING INFORMATION
Device
Voltage
Output*
Shipping
NCP4561SN28T1 2.8 V 3000/Tape & Reel
* Contact your ON Semiconductor sales
representative for other output voltage values.
© Semiconductor Components Industries, LLC, 2002
1
May, 2002 – Rev. 2
Publication Order Number:
NCP4561/D