MIC2150/MIC2151
2-Phase Dual Output PWM Synchronous
Buck Control IC
General Description
Features
The MIC2150/1 are simple 2-phase dual-output
synchronous buck control ICs featuring small size and high
efficiency. The ICs implement PWM control at 500kHz
(MIC2150) or 300kHz (MIC2151), with the outputs
switching 180° out of phase. The result of the out-of-phase
operation is 1MHz input ripple frequency with ripple current
cancellation, minimizing the required input filter
capacitance. A 1% output voltage tolerance allows the
maximum level of system performance. Internal drivers
with adaptive gate drive allow the highest efficiency with
the minimum external components.
A dual threshold enable pin, matched soft-start pins, and a
power good output are provided, allowing a high level of
control.
• Dual Synchronous Buck Control IC with outputs
switching 180 degree out-of-phase
• 4.5V to 14.5V input voltage range
• Adjustable output voltages down to 0.7V
• 1% output voltage accuracy
• MIC2150: 500kHz PWM operation
• MIC2151: 300kHz PWM operation
• Adaptive gate drive allows efficiencies over 95%
• Adjustable current limit with no sense resistor
- Senses low-side MOSFET current
• Internal drivers allow 20A per phase
• Power Good output allow simple sequencing
The MIC2150/1 are available in the small size 4mm×4mm
24-pin MLF® package. The MIC2150/1 has a junction
operating 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
• Dual threshold enable pin
• Independent programmable soft-start pins
• Output over-voltage protection
• Input UVLO
• Works with ceramic output capacitors
• Tiny 4mm×4mm 24-Pin MLF® package
• Multi-output power supplies with sequencing
• Junction temperature range of -40°C to +125°C
• DSP, FPGA, CPU and ASIC power supplies
• Telecom and Networking equipment
• Servers
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Typical Application
MicroLead Frame and MLF are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2009
M9999-082809-A
(408) 944-0800
