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MIC5247 Fiches technique(PDF) 1 Page - Micrel Semiconductor

No de pièce MIC5247
Description  150mA Low-Voltage μCap Linear Regulator Preliminary Information
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Fabricant  MICREL [Micrel Semiconductor]
Site Internet  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC5247 Fiches technique(HTML) 1 Page - Micrel Semiconductor

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MIC5247
Micrel
November 6, 2000
1
MIC5247
Ordering Information
Part Number
Marking
Voltage
Junction Temp. Range
Package
MIC5247-1.5BM5
LU15
1.5V
–40
°C to +125°C
SOT-23-5
MIC5247-1.8BM5
LU18
1.8V
–40
°C to +125°C
SOT-23-5
MIC5247-2.0BM5
LU20
2.0V
–40
°C to +125°C
SOT-23-5
MIC5247-2.4BM5
LU24
2.4V
–40
°C to +125°C
SOT-23-5
Other voltages available. Contact Micrel for details.
General Description
The MIC5247 is an efficient, precise low voltage CMOS
voltage regulator optimized for ultra-low-noise applications.
The MIC5247 offers better than 1% initial accuracy, and 85
µA
constant ground current over load (typically 85
µA). The
MIC5247 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 MIC5247 provides a logic compatible enable pin.
When disabled, power consumption drops nearly to zero.
The MIC5247 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
package, the MIC5247 also offers a range of fixed output
voltages.
Typical Application
15
2
3
4
COUT
CBYP
Enable
Shutdown
EN
VOUT
(optional)
MIC5247-x.xBM5
EN (pin 3) may be
connected directly
to IN (pin 1).
VIN
Ultra-Low-Noise Regulator Application
MIC5247
150mA Low-Voltage
µCap Linear Regulator
Preliminary Information
Features
• Ultralow noise
• Low voltage outputs
• Load independent, ultralow ground current: 85
µA
• 150mA output current
• Current limiting
• Thermal Shutdown
• Tight load and line regulation
•“Zero” off-mode current
• Stability with low-ESR capacitors
• Fast transient response
• Logic-controlled enable input
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• PCMCIA V
CC and VPP regulation/switching
• Consumer/personal electronics
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
IttyBitty is a trademark of Micrel, Inc.


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