The LM2742 is a high-speed, synchronous, switching regulator controller. It is intended
to control currents of 0.7A to 20A with up to 95% conversion efficiencies. Power up and down
sequencing is achieved with the power-good flag, adjustable soft-start and output enable features.
The LM2742 operates from a low-current 5V bias and can convert from a 1V to 16V power rail. The
part utilizes a fixed-frequency, voltage-mode, PWM control architecture and the switching frequency
is adjustable from 50kHz to 2MHz by setting the value of an external resistor. Current limit is
achieved by monitoring the voltage drop across the on-resistance of the low-side MOSFET, which
enables on-times on the order of 40ns, one of the best in the industry. The wide range of operating
frequencies gives the power supply designer the flexibility to fine-tune component size, cost,
noise and efficiency. The adaptive, non-overlapping MOSFET gate-drivers and high-side bootstrap
structure helps to further maximize efficiency. The high-side power FET drain voltage can be from
1V to 16V and the output voltage is adjustable down to 0.6V.
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