MIC5249 Datasheet, PDF (1/7 Pages) Micrel Semiconductor – 300MA UCAP LDO WITH PROGRAMMABLE POWER ON RESET DELAY

MIC5249
Micrel
MIC5249
300mA µCap LDO with Programmable Power-On Reset Delay
General Description
The MIC5249 is an efficient, precise 300mA CMOS voltage
regulator with power-on reset delay which can be imple-
mented via an external capacitor. It offers 1% initial accuracy,
extremely-low-dropout voltage (typically 400mV @ 300mA),
and low ground current (typically 85mA) over load.
Designed specifically for noise-critical applications in hand-
held or battery-powered devices, the MIC5249 comes
equipped with a noise reduction feature to filter the output
noise via an external capacitor. Other features of the MIC5249
include a logic compatible enable pin, current limit, thermal
shutdown, ultra-fast transient response, and an active clamp
to speed up device turnoff.
The MIC5249 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices.
The MIC5249 is available in the MSOP-8 package.
All support documentation can be found on Micrel’s web site
at www.micrel.com.
Features
• 300mA output current
• High PSRR: 65dB@120Hz
• Stable with ceramic output capacitor
• Power-on RESET output with adjustable delay time
• High output accuracy:
±1.0% initial accuracy
±3.0% over temperature
• Low dropout voltage of 400mV @ 300mA
• Low quiescent current: 85µA
• Zero current shutdown mode
• Thermal shutdown protection
• Current-limit protection
• Tiny MSOP-8 package
Applications
• Cellular phones
• PDAs
• Fiber optic modules
Ordering Information
Part Number
Voltage* Junction Temp. Range
MIC5249-1.8BMM
1.8V
–40°C to 125°C
MIC5249-2.5BMM
2.5V
–40°C to 125°C
MIC5249-2.6BMM
2.6V
–40°C to 125°C
MIC5249-2.8BMM
2.8V
–40°C to 125°C
MIC5249-2.85BMM 2.85V
–40°C to 125°C
MIC5249-3.0BMM
3.0V
–40°C to 125°C
* Other voltages available. Contact Micrel for details.
Package
MSOP-8
MSOP-8
MSOP-8
MSOP-8
MSOP-8
MSOP-8
Typical Application
V_IN
ENABLE
SHUTDOWN
C_AD=1.0µF
Ceramic
MIC5249-x.xBMM
IN
OUT
EN RESET
DELAY CBYP
GND
V_OUT
RESET
C_OUT=2.2µF
Ceramic
Sets the delay for
the RESET output
C_BYP=0.01µF
Ultra-Low-Noise Application
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
March 2004
1
M0382-033004