MIC5253_04 Datasheet, PDF (1/9 Pages) Micrel Semiconductor – 100mA Low Noise μCap Teeny™ LDO

MIC5253
Micrel
MIC5253
100mA Low Noise µCap Teeny™ LDO
General Description
The MIC5253 is an efficient, CMOS voltage regulator opti-
mized for ultra-low-noise applications. It offers 1.5% initial
accuracy, extremely low dropout voltage (165mV at 100mA),
and low ground current (typically 95µA at full load). The
MIC5253 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 de-
vices, the MIC5253 provides a TTL-logic-compatible enable
pin. When disabled, power consumption drops nearly to zero.
The MIC5253 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in handheld wireless devices.
Available in the Teeny™ SC-70-5 package, the MIC5253
offers a wide range of output voltages. Key features include
current limit, thermal shutdown, faster transient response,
and an active clamp to speed up device turn-off.
Features
• Input voltage range: 2.7V to 5.5V
• Teeny™ SC-70-5 package
• Ultra-low output noise: 30µV(rms)
• 100mA continuous output current, 150mA peak current
• Stability with ceramic output capacitors
• Ultralow dropout: 165mV @ 100mA
• High output accuracy:
1.5% initial accuracy
3.0% over temperature
• Low ground current: 95µA
• TTL-Logic-controlled enable input
• “Zero” off-mode current
• Thermal shutdown and current limit protection
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).
MIC5253-x.xBC5
1
5
2
3
4
V_OUT
C_OUT = 1.0µF
Ceramic
C_BYP = 0.01µF
Ultra-Low-Noise Regulator Application
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
November 2005
1
M9999-112305