Combined switched-mode/linear regulator delivers the best of both worlds
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The Micrel MIC38300 combines the efficiency of switched-mode conversion with the fast transient response and low output ripple of a linear regulator. |
The MIC38300 is the first in a family of
SuperLNR™ regulators from Micrel, and enables a
stable, low-noise, low-footprint power supply for
low-voltage FPGAs, ASICs and other digital ICs.
The MIC38300 has an input voltage range of
3.0V to 5.5V, and produces a programmable
output of 1.0V to 5.0V with less than 5mV
peak-to-peak noise. Transient performance is
equivalent to typical high-speed LDOs, with less
than 30mV of output voltage deviation including
during fast load changes. The MIC38300 also
achieves 70dB Power Supply Rejection Ratio
(PSRR). The output-current capability is 2.2A
continuous and 3.0A peak.
The high operating efficiency
simplifies thermal management
and reduces heatsink size. Two
resistors are used to programme
the output voltage and the
design can be completed
without an external inductor.
This allows the entire solution to
be built within a footprint less
than 40mm2. External input and
output capacitors are required,
allowing designers to optimise
transient performance, highfrequency
noise, undershoot and
overshoot, and bill of materials costs.
The MIC38300 is housed in a 4mm x 6mm x
0.9mm 28-pin MLF® package. An external pin is
provided to adjust the switching frequency,
allowing designers to optimise output ripple
without losing efficiency.
FEATURES
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- Combined switching-regulator and LDO architecture
- Integrated MOSFET switches
- Thermal-shutdown and current-limit protection
- Operating temperature range:
-40°C to 125°C
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APPLICATIONS
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- POL converters
- Networking and server systems
- Industrial power supplies
- Wireless base-stations
- Noise-sensitive RF applications
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Transient response of linear regulator and switching regulator.
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Exclusive development board offer from the Board Club.
To apply for the MIC38300 development board go to
www.my-boardclub.com/manf-offers.htm
This offer is free and subject to qualification. |
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