MIC22600 Datasheet, PDF (1/17 Pages) Micrel Semiconductor – 1MHz 6A Integrated Switch Synchronous Buck Regulator

MIC22600
1MHz 6A Integrated Switch
Synchronous Buck Regulator
General Description
The Micrel MIC22600 is a high efficiency 6A Integrated
synchronous buck (step-down) regulator. The MIC22600 is
optimized for highest efficiency and achieves more than
90% efficiency, while still switching at 1MHz over a broad
load range with only 1µH inductor and down to 47µF
output capacitor. The ultra-high speed control loop keeps
the output voltage within regulation even under extreme
transient load swings commonly found in FPGAs and low
voltage ASICs. The output voltage can be adjusted down
to 0.7V to address all low voltage power needs. A full
range of sequencing and tracking options is available with
the MIC22600. The Enable/Delay pin combined with the
Power Good/POR pin allows multiple outputs to be
sequenced in any way during turn-on and turn-off. The RC
(Ramp Control™) pin allows the device to be connected to
another product in the MIC22xxx and/or MIC68xxx family,
to keep the output voltages within a certain ∆V on start up.
The MIC22600 is available in a 24-pin 4mm x 4mm MLF^®
with a junction operating range from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Input voltage range: 2.6V to 5.5V
• Output voltage adjustable down to 0.7V
• Output current up to 6A
• Full sequencing and tracking ability
• Power on Reset/Power Good
• Efficiency > 90% across a broad load range
• Ultra fast transient response
– Easy RC compensation
• 100% maximum duty cycle
• Fully integrated MOSFET switches
• Micropower shutdown
• Thermal shutdown and current limit protection
• 24-pin 4mm x 4mm MLF^®
• –40°C to +125°C junction temperature range
Applications
• High power density point of load conversion
• Servers and routers
• DVD recorders
• Computing peripherals
• Base stations
• FPGAs, DSP and low voltage ASIC power
Typical Application
MIC22600 6A 1MHz Synchronous Output Converter
Efficiency V_O - 3.3V
100
95
90
85
80
75
70
65
60
55
500
V_IN - 5V
1234567
OUTPUT CURRENT (A)
Sequencing & Tracking
Ramp Control 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
September 2007
M9999-092007-A