MIC5191
Ultra High-Speed, High-Current
Active Filter / LDO Controller
PowerPAK is a trademark of Siliconix, 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
December 2006
1
M9999-122206
General Description
The MIC5191 is an ultra high-speed linear regulator. It
uses an external N-Channel FET as its power device.
The MIC5191's ultra high-speed abilities can handle the
fast load demands of microprocessor cores, ASICs, and
other high-speed devices. Signal bandwidths of greater
than 500 kHz can be achieved with a minimum amount of
capacitance while at the same time keeping the output
voltage clean, regardless of load demand. A powerful
output driver delivers large MOSFETs into their linear
regions, achieving ultra-low dropout voltage.
1.25V
IN
?0% can be turned into 1V ?% without the use
of a large amount of capacitance.
MIC5191 (1.0V reference) is optimized for output voltages
of 1.0V and higher.
The MIC5191 is offered in 10-pin 3mm?mm MLF
?/DIV>
and
10-pin MSOP-10 packages and has an operating junction
temperature range of 40癈 to +125癈.
Data sheets and support documentation can be found on
Micrels web site at www.micrel.com.
Features
" Input voltage range: V
IN
= 1.0V to 5.5V
" +1.0% initial output tolerance
" Dropout down to 25mV@10A
" Filters out switching frequency noise on input
" Very high large signal bandwidth >500kHz
" PSRR >40dB at 500kHz
" Adjustable output voltage down to 1.0V
" Stable with any output capacitor
" Excellent line and load regulation specifications
" Logic controlled shutdown
" Current limit protection
" 10-pin MLF
?/DIV>
and MSOP-10 packages
" Available 40癈 to +125癈 junction temperature
Applications
" Distributed power supplies
" ASIC power supplies
" DSP, 礟, and 礐 power supplies
___________________________________________________________________________________________________________
Typical Application
VIN
SGND
PGND
IS
IR3716S
OUT
VCC1
C3
0.01礔
C2
10礔
FB
GND
V
OUT
1.0V@7A
GND
VCC2
EN
COMP
MIC5191
R3
C1
0.01礔
IN
1.2V
V
CC
=12V
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