MIC5247
Micrel
MIC5247
150mA Low-Voltage
碌
Cap 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 85碌A(chǔ)
constant ground current over load (typically 85碌A(chǔ)). 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鈩?SOT-23-5
package, the MIC5247 also offers a range of fixed output
voltages.
Features
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Ultralow noise
Low voltage outputs
Load independent, ultralow ground current: 85碌A(chǔ)
150mA output current
Current limiting
Thermal Shutdown
Tight load and line regulation
鈥淶ero鈥?off-mode current
Stability with low-ESR capacitors
Fast transient response
Logic-controlled enable input
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
Applications
Ordering Information
Part Number
MIC5247-1.5BM5
MIC5247-1.8BM5
MIC5247-2.0BM5
MIC5247-2.4BM5
Marking
LU15
LU18
LU20
LU24
Voltage
1.5V
1.8V
2.0V
2.4V
Junction Temp. Range
鈥?0擄C to +125擄C
鈥?0擄C to +125擄C
鈥?0擄C to +125擄C
鈥?0擄C to +125擄C
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Other voltages available. Contact Micrel for details.
Typical Application
V
IN
MIC5247-x.xBM5
1
2
Enable
Shutdown
3
4
5
V
OUT
C
OUT
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
C
BYP
(optional)
Ultra-Low-Noise Regulator Application
IttyBitty is a trademark of Micrel, Inc.
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
November 6, 2000
1
MIC5247
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