MIC5245 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 150mA μCap CMOS LDO Regulator Preliminary Information

MIC5245
Micrel
MIC5245
150mA µCap CMOS LDO Regulator
Preliminary Information
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.
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
Typical Application
Ordering Information
Part Number
Marking Voltage
MIC5245-2.5BM5
LS25
2.5V
MIC5245-2.7BM5
LS27
2.7V
MIC5245-2.8BM5
LS28
2.8V
MIC5245-2.85BM5
LS2J
2.85V
MIC5245-3.0BM5
LS30
3.0V
MIC5245-3.1BM5
LS31
3.1V
MIC5245-3.3BM5
LS33
3.3V
MIC5245-3.3BMM
—
3.3V
Other voltages available. Contact Micrel for details.
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
MSOP-8
V_IN
MIC5245-x.xBM5
1
5
V_OUT
2
Enable
Shutdown
3
EN
EN (pin 3) may be
connected directly
o IN (pin 1).
C_OUT
4
C_BYP
(optional)
ENABLE
SHUTDOWN
V_IN
V_OUT
C_OUT
MIC5245-3.3MM
1
8
2
7
3
6
4
5
C_BYP
(OPTIONAL)
Ultra-Low-Noise Regulator Application
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
June 2000
1
MIC5245