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
efficiency.
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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