MIC5255
150mA Low Noise µCap CMOS LDO
General Description
Features
The MIC5255 is an efficient, precise CMOS voltage
•
Input voltage range: 2.7V to 6.0V
regulator optimized for ultra-low-noise applications. It
•
Thin SOT package: 1mm height SOT-23-5
offers 1% initial accuracy, extremely-low dropout voltage
•
Ultra-low output noise: 30µV(rms)
(135mV at 150mA) and low ground current (typically
•
Stability with ceramic output capacitors
90µA). The MIC5255 provides a very-low-noise output,
•
Ultra-low dropout: 135mV @ 150mA
ideal for RF applications where a clean voltage source is
required. A noise bypass pin is also available for further
•
High output accuracy:
reduction of output noise.
– 1.0% initial accuracy
Designed specifically for handheld and battery-powered
– 2.0% over temperature
devices, the MIC5255 provides a TTL-logic-compatible en-
•
Low quiescent current: 90µA
able pin. When disabled, power consumption drops nearly
•
Tight load and line regulation
to zero.
•
TTL-Logic-controlled enable input
The MIC5255 also works with low-ESR ceramic
•
“Zero” off-mode current
capacitors, reducing the amount of board space necessary
for power applications, critical in handheld wireless
•
Thermal shutdown and current limit protection
devices.
Key features include current limit, thermal shutdown, faster
Applications
transient response, and an active clamp to speed up
device turn-off. Available in the 6-pin 2mm × 2mm MLF
®
•
Cellular phones and pagers
package, the IttyBitty
®
SOT-23-5 package and the new
•
Cellular accessories
Thin SOT-23-5, which offers the same footprint as the
•
Battery-powered equipment
standard IttyBitty
®
SOT-23-5, but only 1mm tall. The
•
Laptop, notebook, and palmtop computers
MIC5255 offers a range of output voltages.
•
Consumer/personal electronics
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
V
IN
MIC5255-x.x_M5
1
2
3
4
5
C
IN
= 1.0µF
Ceramic
Enable
Shutdown
V
OUT
C
OUT
= 1.0µF
Ceramic
C
BYP
= 0.01µF
Ultra-Low-Noise Regulator Application
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
IttyBitty is a registered trademark of Micrel, Inc
MLF and
MicroLeadFrame
are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November 2006
1
M9999-110906
MICREL [ MICREL SEMICONDUCTOR ]
