MIC47050 Datasheet, PDF (1/14 Pages) Micrel Semiconductor – 500mA ULDO with Low Input and Low Output Voltage

MIC47050
500mA ULDO™ with Low Input
and Low Output Voltage
General Description
The MIC47050 is a high-speed, ultra-low dropout, dual-
supply NMOS ULDO™ designed to take advantage of
point-of-load applications that use multiple supply rails to
generate a low-voltage, high-current power supply. The
MIC47050 can source 500mA of output current while only
requiring a 1µF ceramic output capacitor for stability. A
1.5% output voltage accuracy, low dropout voltage (44mV
@ 500mA), and low ground current makes this device
ideally suited for mobile and point-of-load applications.
The MIC47050 has an NMOS output stage offering very
low output impedance. The NMOS output stage makes for
a unique ability to respond very quickly to sudden load
changes such as that required by a microprocessor, DSP
or FPGA. The MIC47050 consumes little quiescent current
and therefore can be used for driving the core voltages of
mobile processors, post regulating a core DC/DC
converter in any processor.
The MIC47050 is available in fixed and adjustable output
voltages in the tiny 2mm x 2mm MLF^® package with an
operating junction temperature range of −40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Voltage Range
– Input Voltage: 1.0V to 3.6V
– Bias Voltage: 2.3V to 5.5V
• 0.4V to 2.0V output voltage range
• Low dropout voltage of 44mV at 500mA
• ±1.5% initial output voltage accuracy
• High bandwidth – very fast transient response
• Stable with a 1µF ceramic output capacitor
• Logic level enable input
• UVLO on both supply voltages
• Thermally-enhanced 2mm x 2mm MLF^® package
• Junction temperature range of –40°C to +125°C
Applications
• Point-of-load applications
• PDAs, Notebooks, and Desktops
• Datacom and Telecom systems
• DSP, PLD and FPGA power supply
• Low-voltage post regulation
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Typical Application
ULDO is a trademark of Micrel Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
March 2010
M9999-032310-A