MIC2204 Datasheet, PDF (1/11 Pages) Micrel Semiconductor – High-Efficiency 2MHz Synchronous Buck Converter

MIC2204
Micrel
MIC2204
High-Efficiency 2MHz Synchronous Buck Converter
General Description
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 .
Features
• 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
Applications
• High-efficiency portable power
• Cellular phones
• PDAs
• 802.11 WLAN power supplies
• RF power supplies
• Li Ion battery powered applications
Typical Application
2.3V to 6V
4.7µH
MIC2204BMM
1
10
2
9
SYNC_IN
3
8
SYNC_OUT
4
7
EN
5
6
10nF
3.3V
500mA
4.7µF
Adjustable Output Synchronous Buck Converter
Efficiency
vs. Output Current
100
95
90
85 ^4.2VIN
80
75
5V_IN
3.6V_IN
70
65
60
55
3.3V_OUT
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 [phone] • fax + 1 [phone] • http://www.micrel.com
January 2004
1
M0214-012904