The LM2743 is a high-speed synchronous buck regulator controller with an accurate
feedback voltage accuracy of ±2%. It can provide simple down conversion to output voltages as low
as 0.6V. Though the control sections of the IC are rated for 3 to 6V, the driver sections are
designed to accept input supply rails as high as 16V. The use of adaptive non-overlapping MOSFET
gate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The IC
is designed for the more cost-effective option of driving only N-channel MOSFETs in both the
high-side and low-side positions. It senses the low-side switch voltage drop for providing a
simple, adjustable current limit.
The fixed-frequency voltage-mode PWM control architecture is adjustable from 50 kHz to 1
MHz with one external resistor. This wide range of switching frequency gives the power supply
designer the flexibility to make better tradeoffs between component size, cost and
Features include soft-start, input under-voltage lockout (UVLO) and Power Good (based on
both under-voltage and over-voltage detection). In addition, the shutdown pin of the IC can be used
for providing startup delay, and the soft-start pin can be used for implementing precise tracking,
for the purpose of sequencing with respect to an external rail.
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