4a Lm20k Reference Designs

 The LM20124 LM20134 and LM20144 are a full-featured
family of high performance 4A synchronous buck converters.
These devices are tailored to operate over an input voltage
range of 2.95V to 5.5V and each CAN be optimized to meet
many different performance requirements. The LM20124 op-
erates at a fixed frequency and only requires 11 components
to generate a solution. The LM20144 is similar to the
LM20124 except the frequency of the device CAN be varied
from 460 kHz to 1.5 MHz with an external resistor. This gives
the power supply designer the flexibility to trade-off inductor
size and efficiency. The LM20134 features a synchronization
input pin that synchronizes the internal Oscillator to an exter-
nal signal to keep the Switching Regulators operating with the
same phase which is critical in many noise sensitive designs.
The reference designs discussed will show how the 4A de-
vices CAN be optimized for size, efficiency and transient re-
sponse. The trade-offs made for each design will be
discussed for the various 4A devices. Test results for includ-
ing efficiency, output voltage ripple, and transient response
will be shown for each design.
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4a Lm20k Reference Designs application circuits
4a Lm20k Reference Designs application circuits



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