MIC22950 Datasheet, PDF (1/22 Pages) Micrel Semiconductor – 10A Integrated Switch Synchronous Buck Regulator with Frequency Programmable to 2MHz

MIC22950
10A Integrated Switch Synchronous
Buck Regulator with Frequency
Programmable to 2MHz
General Description
Features
The Micrel MIC22950 is a high-efficiency 10A integrated
switch, synchronous buck (step-down) regulator. The
MIC22950 switching frequency is programmable from
400kHz to 2MHz, allowing the customer to optimize
designing either for efficiency or for the smallest footprint.
The MIC22950 achieves over 95% efficiency while still
switching at 2MHz over a broad load range.
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.
• 2.6V to 5.5V supply voltage
• Fully-integrated MOSFET switches
• Adjustable output voltage option down to 0.7V
• Output load current up to 10A
• Full sequencing and tracking capability
• Power-On Reset
• Efficiency >95% across a broad load range
• Operating frequency programmable: 400kHz to 2MHz
• Ultra-fast transient response
The output voltage can be adjusted down to 0.7V in order ^{• 100% maximum duty cycle}
to address all low-voltage power needs.
• Micropower shutdown
The MIC22950 features a full range of sequencing and
tracking options. The EN/DLY and the DELAY pins,
combined with the POR/PG pin, allow multiple outputs to
be sequenced in several ways during turn-on and turn-off
by using EN pin. The RC (Ramp Control™) pin allows the
device to be connected to any another device in the
MIC22x00 family of products, to keep the output voltages
within a certain delta V during start-up.
The MIC22950 is available in a 32-pin 5mm x 5mm MLF^®
with a junction operating range from −40°C to +125°C.
• Thermal-shutdown and current-limit protection
• Available in a 32-pin 5mm x 5mm MLF^® package
• −40°C to +125°C junction temperature range
Applications
• High-power density point-of-load conversion
• Base stations, Servers and Routers
• Blu-ray players, DVD Recorders
• Computer Peripherals
Datasheet and supporting documentation can be found on
Micrel’s web site at: www.micrel.com.
• FPGAs, DSP, and low-voltage ASIC power
_________________________________________________________________________________________________________________________
Typical Application
MIC22950 10A Synchronous DC-DC Converter
Efficiency vs. Load Current
100
95
90
85
80
75
70
65
60
0
VIN = 5V
VOUT = 3.3V
TA = 25°C
2
4
6
8
10
LOAD CURRENT (A)
Sequencing and 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
February 2010
M9999-021910-B