MIC5255_06 Datasheet, PDF (1/13 Pages) Micrel Semiconductor – 150mA Low Noise Cap CMOS LDO

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