MIC22601 Datasheet, PDF (1/18 Pages) Micrel Semiconductor – 4 MHz, 6A Integrated Switch Synchronous Buck Regulator

MIC22601
4 MHz, 6A Integrated Switch
Synchronous Buck Regulator
General Description
Features
The Micrel MIC22601 is a high efficiency 6A Integrated • Input voltage range: 2.6V to 5.5V
switch synchronous buck (step-down) regulator. The
MIC22601 is optimized for highest efficiency (greater than
90%), while still switching at 4MHz over a broad load
range with only 0.22µH inductor and down to 22µF 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
• 4MHz PWM frequency
• Adjustable output voltage option down to 0.7V
• Output current to 6A
• Small Passive components: 0.22µH and 22µF
• Full sequence and tracking ability
• Power On Reset/Power Good
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 MIC22601. The enable/delay pin, combined with the
power good PG/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,
• Ultra fast transient response
– Easy RC compensation
• 100% maximum duty cycle
• Fully integrated MOSFET switches
• Micro power shutdown
• Thermal shutdown and current limit protection
• 24-pin 4mmx4mm MLF^® package
to keep the output voltages within a certain ΔV on start up. • –40°C to +125°C junction temperature range
The MIC22601 is available in a 24-pin 4mm x 4mm MLF^®
package with a junction operating temperature range from
–40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Applications
• High power density point of load conversion
• Servers and routers
• Blu-ray/DVD players and recorders
• Computer peripherals
• Base stations
• FPGA, DSP and low voltage ASIC power
_____________________________________________________________________________________________________________________________________
Typical Application
Efficiency
vs. Load Current
100
90
V_IN = 3.6V
80
VIN = 5V
70
60
50
VOUT = 3.3V
T_A = 25°C
L = 470nF
400 _{1 2 3 4 5 6}
OUTPUT CURRENT (A)
Figure 1. Typical Application Circuit, 6A 4MHz Synchronous Output Converter
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
May 2009
M9999-050509-A