MIC25400 Datasheet, PDF (1/27 Pages) Micrel Semiconductor – 2A Dual Output PWM Synchronous Buck Regulator IC

MIC25400
2A Dual Output PWM Synchronous Buck
Regulator IC
General Description
Features
The MIC25400 is a synchronous PWM dual output step
down converter with internal 2A high-side switches. The
MIC25400 has an integrated low-side gate driver for
synchronous step-down conversion by connecting an
external N-channel MOSFET to achieve high efficiencies
in low duty-cycle applications. The IC’s switching
frequency is 1MHz. A patented control scheme allows the
use of a wide range of output capacitance from small
ceramic capacitors to large electrolytic types with only one
compensation component. A 2% output voltage tolerance
over the temperature range allows the maximum level of
system performance. The MIC25400 power good signal
allows full control for sequencing the output voltages with
minimum external components.
An adjustable current limit allows the use of smaller
inductors in lower current applications.
The MIC25400 is available in the ePAD 24-pin 4mm x
4mm MLF^® package, and has an operating junction
temperature range of –40°C to +125°C.
• 4.5V to 13.2V input voltage range
• Adjustable output voltages down to 0.7V
• 2A per channel
• 180° out of phase operation
• Low-side driver for synchronous operation
• 2% output voltage accuracy (over temperature)
• 1MHz switching frequency
• Output voltage sequencing
• Programmable max current-limit
• Power good output
• Ramp Control™ provides soft-start
• Low-side current sensing allows very low duty-cycle
• Works with ceramic output capacitors
• 24-pin 4mm x 4mm MLF^® package
• Junction temperature range of –40°C to +125°C
Applications
• Multi-output power supplies with sequencing
• DSP, FPGA, CPU and ASIC power supplies
• Telecom and networking equipment, servers
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Typical Application
MIC25400 Dual Output Buck Converter
Ramp Control is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
January 2011
M9999-020111-C