© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 8
1 Publication Order Number:
MC33761/D
MC33761
Ultra Low−Noise Low
Dropout Voltage Regulator
with 1.0 V ON/OFF Control
The MC33761 is an Low DropOut (LDO) regulator featuring
excellent noise performances. Thanks to its innovative design, the
circuit reaches an impressive 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
accelerates the response time to a wake−up signal and keeps it within
40 ms (in repetitive mode), making the MC33761 as a natural
candidate for portable applications.
The MC33761 also hosts a novel architecture which prevents
excessive undershoots in the presence 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, I
out
= 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
• V
out
Available at 2.5 V, 2.8 V, 2.9 V, 3.0 V, 5.0 V
• Operating Range from −40 to +85°C
• Dual Version is Available as MC33762
• Pb−Free Packages are Available
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
V
out
V
in
GND
NC
ON/
OFF
5
1
2
4
3
THIN SOT−23−5
SN SUFFIX
CASE 483
1
5
PIN CONNECTIONS AND
MARKING DIAGRAM
1
3
NC
V
in
2
GND
ON/OFF
4
V
out
5
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
ORDERING INFORMATION
(Top View)
http://onsemi.com
LxxAYW G
G
Lxx = Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)