MIC5219 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 500mA-Peak Output LDO Regulator

MIC5219
Micrel
MIC5219
500mA-Peak Output LDO Regulator
General Description
The MIC5219 is an efficient linear voltage regulator with high
peak output current capability, very low dropout voltage, and
better than 1% output voltage accuracy. Dropout is typically
10mV at light loads and less than 500mV at full load.
The MIC5219 is designed to provide a peak output current for
startup conditions where higher inrush current is demanded.
It features a 500mA peak output rating. Continuous output
current is limited only by package and layout.
The MIC5219 can be enabled or shut down by a CMOS or
TTL compatible signal. When disabled, power consumption
drops nearly to zero. Dropout ground current is minimized to
help prolong battery life. Other key features include reversed-
battery protection, current limiting, overtemperature shut-
down, and low noise performance with an ultra-low-noise
option.
The MIC5219 is available in adjustable or fixed output volt-
ages in space-saving SOT-23-5 and MM8™ 8-lead power
MSOP packages. For higher power requirements see the
MIC5209 or MIC5237.
Features
• Guaranteed 500mA-peak output over the full operating
temperature range
• Low 500mV maximum dropout voltage at full load
• Extremely tight load and line regulation
• Tiny SOT-23-5 and MM8™ power MSOP-8 package
• Ultra-low-noise output
• Low temperature coefficient
• Current and thermal limiting
• Reversed-battery protection
• CMOS/TTL-compatible enable/shutdown control
• Near-zero shutdown current
Applications
• Laptop, notebook, and palmtop computers
• Cellular telephones and battery-powered equipment
• Consumer and personal electronics
• PC Card V_CC and V_PP regulation and switching
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
Typical Applications
ENABLE
SHUTDOWN
V_IN 6V
V_OUT 5V
2.2µF
tantalum
MIC5219-5.0BMM
1
8
2
7
3
6
4
5
470pF
5V Ultra-Low-Noise Regulator
V_IN 4V
ENABLE
SHUTDOWN
MIC5219-3.3BM5
1
5
2
3
4
V_OUT 3.3V
2.2µF
tantalum
470pF
3.3V Ultra-Low-Noise Regulator
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
July 2000
1
MIC5219