ADVANCE INFORMATION www.DataSheet4U.com
September 2004
LM2744 Low Voltage N-Channel MOSFET Synchronous Buck Regulator C...
ADVANCE INFORMATION www.DataSheet4U.com
September 2004
LM2744 Low
Voltage N-Channel
MOSFET Synchronous Buck Regulator Controller with External Reference
LM2744 Low
Voltage N-Channel
MOSFET Synchronous Buck Regulator Controller with External Reference
General Description
The LM2744 is a high-speed synchronous buck regulator controller with an externally adjustable reference
voltage (between 0.5V to 1.5V). It can provide simple down conversion to output
voltages as low as 0.5V. 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 highside 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 ...