MIC5245 Micrel
June 2000 1 MIC5245
General Description
The MIC5245 is an efficient, precise CMOS voltage regulator
optimized for ultra-low-noise applications. The MIC5245 of-
fers better than 1% initial accuracy, extremely low dropout
voltage (typically 150mV at 150mA) and constant ground
current over load (typically 100µA). The MIC5245 provides a
very low noise output, ideal for RF applications where quiet
voltage sources are required. A noise bypass pin is also
available for further reduction of output noise.
Designed specifically for hand-held and battery-powered
devices, the MIC5245 provides a TTL logic compatible en-
able pin. When disabled, power consumption drops nearly to
zero.
The MIC5245 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices.
Key features include current limit, thermal shutdown, a push-
pull output for faster transient response, and an active clamp
to speed up device turnoff. Available in the IttyBitty™ SOT-23-5
and power MSO-8 packages, the MIC5245 also offers a
range of fixed output voltages.
Typical Application
15
2
3
4
C
OUT
C
BYP
Enable
Shutdown
EN
V
OUT
(optional)
MIC5245-x.xBM5
E
N (pin 3) may be
c
onnected directly
o
IN (pin 1).
V
IN
MIC5245
150mA µCap CMOS LDO Regulator
Preliminary Information
Features
• Ultralow dropout—100mV @ 100mA
• Ultralow noise—30µV(rms)
• Stability with tantalum or ceramic capacitors
• Load independent, ultralow ground current
• 150mA output current
• Current limiting
• Thermal Shutdown
• Tight load and line regulation
•“Zero” off-mode current
• Fast transient response
• TTL-Logic-controlled enable input
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• PCMCIA V
CC
and V
PP
regulation/switching
• Consumer/personal electronics
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
Ordering Information
Part Number Marking Voltage Junction Temp. Range Package
MIC5245-2.5BM5 LS25 2.5V –40°C to +125°C SOT-23-5
MIC5245-2.7BM5 LS27 2.7V –40°C to +125°C SOT-23-5
MIC5245-2.8BM5 LS28 2.8V –40°C to +125°C SOT-23-5
MIC5245-2.85BM5 LS2J 2.85V –40°C to +125°C SOT-23-5
MIC5245-3.0BM5 LS30 3.0V –40°C to +125°C SOT-23-5
MIC5245-3.1BM5 LS31 3.1V –40°C to +125°C SOT-23-5
MIC5245-3.3BM5 LS33 3.3V –40°C to +125°C SOT-23-5
MIC5245-3.3BMM — 3.3V –40°C to +125°C MSOP-8
Other voltages available. Contact Micrel for details.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
1
2
3
4
8
7
6
5
MIC5245-3.3MM
ENABLE
SHUTDOWN
C
BYP
(OPTIONAL)
V
IN
V
OUT
C
OUT
Ultra-Low-Noise Regulator Application
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