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 1
µ
F 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
®
and Thin MLF
®
packages with an operating junction temperature range of
40C
to
125C.
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
Available in thermally-enhanced 2mm x 2mm MLF
®
and
Thin MLF
®
packages
Junction temperature range of –40C to +125C
Applications
Point-of-load applications
PDAs, notebooks, and desktops
Datacom and telecom systems
DSP, PLD and FPGA power supply
Low-voltage post regulation
_________________________________________________________________________________________________________________________
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 +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
April 2012
M9999-040312-B
MICREL [ MICREL SEMICONDUCTOR ]
