Buck Converter. MIC2204 Datasheet
High-Efficiency 2MHz Synchronous Buck Converter
The Micrel MIC2204 is a high-efficiency, 2MHz PWM syn-
chronous buck switching regulator. Power conversion effi-
ciency of above 95% is easily obtainable over a wide range
of applications. A proprietary internal compensation tech-
nique ensures stability with the smallest possible inductor
and ceramic output capacitor.
The MIC2204 operates from 2.3V to 5.5V input and features
internal power MOSFETs that can supply over 600mA of
output current with output voltages down to 1V. The MIC2204
implements a constant 2MHz pulse-width-modulation (PWM)
control scheme which reduces spurious noise in sensitive RF
and communication applications. Additionally, the MIC2204
can be synchronized to an external clock, or multiple MIC2204s
can easily be daisy-chained with the SYNCLOCK feature.
The MIC2204 has a high bandwidth loop (typ. 200kHz) which
allows ultra-fast transient response times. This is very useful
when powering applications that require fast dynamic re-
sponses, such as the CPU cores and RF circuitry in high-
performance cellular phones and PDAs.
The MIC2204 is available in 10-pin MSOP and 3mm × 3mm
MLF™-10L package options with an operating junction tem-
perature range from –40°C to 125°C .
• Input voltage range: 2.3V to 5.5V
• Output down to 1V/ 600mA
• 2MHz PWM operation
• Ultra-fast transient response (typical 200kHz GBW)
• Internal compensation
• All ceramic capacitors
• >95% efficiency
• Fully integrated MOSFET switches
• Easily synchronized to external clock
• SYNCLOCK feature to daisy-chain multiple 2204s
• <340µA quiescent current
• Logic controlled micropower shutdown
• Thermal shutdown and current limit protection
• 10-pin MSOP and 3mm×3mm MLF™-10L
• –40°C to +125°C junction temperature range
• High-efficiency portable power
• Cellular phones
• 802.11 WLAN power supplies
• RF power supplies
• Li Ion battery powered applications
2.3V to 6V
Adjustable Output Synchronous Buck Converter
vs. Output Current
500 100 200 300 400 500
OUTPUT CURRENT (mA)
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
8, 9, 10
Switch (Output): Internal power MOSFET output switches.
Supply Voltage (Input): Requires bypass capacitor to GND.
SYNC_IN for the MIC2204: Sync the main switching frequency to an
external clock. Tie pin to ground if not using this function. Tying SYNC_IN
high reduces the switching frequency to 1.6MHz (See “Applications Informa-
SYNC_OUT an open collector output to feed into SYNC_IN. Float or ground
the SYNC_OUT pin if not using sync out function.
A low level EN will power down the device, reducing the quiescent current to
under 15µA (typ. 6.5µA).
Input to the error amplifier, connect to the external resistor divider network to
set the output voltage.
Internal circuit bias supply, nominally 2.3V. Must be de-coupled to signal
ground with a 0.01µF capacitor.
2 January 2004