CONTROL IC. MIC2193 Datasheet
400kHz SO-8 Synchronous Buck Control IC
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
The MIC2193 is available in an 8 pin SOIC package with a
junction temperature range of –40°C to +125°C.
• 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
• Point of load power supplies
• Distributed power systems
• Wireless Modems
• ADSL line cards
• Step down conversion in 3.3V, 5V, and 12V systems
• 1-and 2-cell Li Ion battery operated equipment
Adjustable Output Synchronous Buck Converter
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
–40°C to +125°C
–40°C to +125°C
8 Lead SOIC (M)
Controller supply voltage. Also the (+) input to the current sense amp.
Compensation (Output): Internal error amplifier output. Connect to a
capacitor or series RC network to compensate the regulator’s control loop.
Feedback Input: The circuit regulates this pin to 1.245V.
The (–) input to the current limit comparator. A built in offset of 110mV
between VIN and CSL in conjunction with the current sense resistor sets the
current limit threshold level. This is also the (–) input to the current amplifier.
3V internal linear-regulator output. VDD is also the supply voltage bus for the
chip. Bypass to GND with 1µF.
High current drive for the synchronous N-channel MOSFET. Voltage swing
is from ground to VIN. On-resistance is typically 6Ω at 5VIN.
High current drive for the high side P-channel MOSFET. Voltage swing is
from ground to VIN. On-resistance is typically 6Ω at 5VIN.