MIC22700_10 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 _1234567
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
March 2010
M9999-031810-B