MIC22700 Datasheet, PDF (1/21 Pages) Micrel Semiconductor – 1MHz, 7A Integrated Switch High Efficiency Synchronous Buck Regulator

MIC22700
1MHz, 7A Integrated Switch High
Efficiency Synchronous Buck Regulator
General Description
The Micrel MIC22700 is a high efficiency 7A Integrated
switch synchronous buck (step-down) regulator. The
MIC22700 is optimized for highest efficiency, achieving
more than 95% efficiency while still switching at 1MHz
over a broad range. The device works with a small 1µH
inductor and 100µF 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. The MIC22700 offers a full range of
sequencing and tracking options. 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 MIC22700 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 load current up to 7A
• Full sequencing and tracking capability
• Power on Reset/Power Good output
• Efficiency > 95% 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 / Blu-Ray players
• Computing peripherals
• Base stations
• FPGAs, DSP and low voltage ASIC power
Typical Application
MIC22700 7A 1MHz Synchronous Output Converter
Efficiency @ 3.3V_OUT
100
95
90
85
80
75
70
65
60
55 _{VIN = 5.5V}
500 _{1 2 3 4 5 6 7}
LOAD 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
July 2009
M9999-072209-B