MIC2193 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – 400KHZ SO 8 SYNCHRONOUS BUCK CONTROL IC

MIC2193
Micrel
MIC2193
400kHz SO-8 Synchronous Buck Control IC
General Description
Micrel’s MIC2193 is a high efficiency, PWM synchronous
buck control IC housed in the SO-8 package. Its 2.9V to 14V
input voltage range allows it to efficiently step down voltages
in 3.3V, 5V, and 12V systems as well as 1- or 2-cell Li Ion
battery powered applications.
The MIC2193 solution saves valuable board space. The
device is housed in the space-saving SO-8 package, whose
low pin-count minimizes external components. Its 400kHz
PWM operation allows a small inductor and small output
capacitors to be used. The MIC2193 can implement all-
ceramic capacitor solutions.
The MIC2193 drives a high-side P-channel MOSFET, elimi-
nating the need for high-side boot-strap circuitry. This feature
allows the MIC2193 to achieve maximum duty cycles of
100%, which can be useful in low headroom applications. A
low output driver impedance of 4Ω allows the MIC2193 to
drive large external MOSFETs to generate a wide range of
output currents.
The MIC2193 is available in an 8 pin SOIC package with a
junction temperature range of –40°C to +125°C.
Features
• 2.9V to 14V input voltage range
• 400kHz oscillator frequency
• PWM current mode control
• 100% maximum duty cycle
• Front edge blanking
• 4Ω output drivers
• Cycle-by-cycle current limiting
• Frequency foldback short circuit protection
• 8 lead SOIC package
Applications
• Point of load power supplies
• Distributed power systems
• Wireless Modems
• ADSL line cards
• Servers
• Step down conversion in 3.3V, 5V, and 12V systems
• 1-and 2-cell Li Ion battery operated equipment
Typical Application
V_IN
3.3V
120µF
6.3V
(×2)
1µF
2.2nF
0.012Ω
MIC2193BM
VIN
CS
VDD OUTP
2k
COMP OUTN
GND FB
Si9803
(×2)
3.8µH
Si9804 _10k
(×2)
22.6k
V_OUT
1.8V, 5A
220µF
6.3V
(×2)
Adjustable Output Synchronous Buck Converter
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
April 2004
1
M9999-042704