MIC5246 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 150mA μCap CMOS LDO Regulator Preliminary Information

MIC5246
Micrel
MIC5246
150mA µCap CMOS LDO Regulator
Preliminary Information
General Description
The MIC5246 is an efficient, precise CMOS voltage regulator
optimized for low-noise applications. The MIC5246 offers
better than 1% initial accuracy, extremely-low-dropout volt-
age (typically 150mV at 150mA) and constant ground current
(typically 85µA)over load . The MIC5246 features an error
flag that indicates an output fault condition such as overcurrent,
thermal shutdown and dropout. The MIC5246 provides a very
low noise output, ideal for RF applications where quiet
voltage sources are required.
Designed specifically for hand-held and battery-powered
devices, the MIC5246 provides a TTL-logic-compatible en-
able pin. When disabled, power consumption drops nearly to
zero.
The MIC5246 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 MIC5246 also offers a range of fixed output
voltages.
Features
• Error flag indicates fault condition
• Ultralow dropout—100mV @ 100mA
• 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
• 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
Ordering Information
Part Number
Marking Voltage
MIC5246-2.6BM5
LT26
2.6V
MIC5246-2.7BM5
LT27
2.7V
MIC5246-2.8BM5
LT28
2.8V
MIC5246-2.85BM5
LT2J
2.85V
MIC5246-3.0BM5
LT30
3.0V
MIC5246-3.3BM5
LT33
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
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Typical Application
47kΩ
V_IN
MIC5246-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
FLG
C_FLG
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
June 2000
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MIC5246