MIC5245 查看數據表（PDF） - Micrel
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MIC5245 Datasheet PDF : 12 Pages
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MIC5245
Micrel
MIC5245
150mA µCap CMOS LDO Regulator
Final 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.
Not recommended for new designs, see MIC5255.
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 VCC and VPP regulation/switching
• Consumer/personal electronics
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
Ordering Information
Typical Application
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
MIC5245-3.2BM5
LS32
3.2V
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
–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
SOT-23-5
MSOP-8
VIN
MIC5245-x.xBM5
1
5
VOUT
2
Enable
Shutdown
3
EN
EN (pin 3) may be
connected directly
o IN (pin 1).
COUT
4
CBYP
(optional)
ENABLE
SHUTDOWN
VIN
VOUT
COUT
MIC5245-3.3MM
1
8
2
7
3
6
4
5
CBYP
(OPTIONAL)
Ultra-Low-Noise Regulator Application
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
August 2002
1
MIC5245
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