MIC5247 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – 150mA Low-Voltage μCap Linear Regulator Preliminary Information

MIC5247
Micrel
MIC5247
150mA Low-Voltage µCap Linear Regulator
Preliminary Information
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 85µA
constant ground current over load (typically 85µA). 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.
Features
• Ultralow noise
• Low voltage outputs
• Load independent, ultralow ground current: 85µA
• 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 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
MIC5247-1.5BM5
LU15
1.5V
MIC5247-1.8BM5
LU18
1.8V
MIC5247-2.0BM5
LU20
2.0V
MIC5247-2.4BM5
LU24
2.4V
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
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Typical Application
V_IN
MIC5247-x.xBM5
1
5
V_OUT
2
Enable
Shutdown
3
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
C_OUT
4
C_BYP
(optional)
Ultra-Low-Noise Regulator Application
IttyBitty is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
November 6, 2000
1
MIC5247