The LM2743MTCX is a high-speed synchronous buck regulator controller with an accuratefeedback voltage accuracy of ±2%. It can provide simple down conversion to output voltages as lowas 0.6 V. Though the control sections of the IC are rated for 3 V to 6 V, the driver sections aredesigned to accept input supply rails as high as 16 V. The use of adaptive non-overlapping MOSFETgate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The ICis designed for the more cost-effective option of driving only N-channel MOSFETs in both thehigh-side and low-side positions. It senses the low-side switch voltage drop for providing asimple, adjustable current limit.
The fixed-frequency voltage-mode PWM control architecture is adjustable from 50 kHz to 1MHz with one external resistor. This wide range of switching frequency gives the power supplydesigner the flexibility to make better tradeoffs between component size, cost andefficiency.
Features include soft start, input undervoltage lockout (UVLO) and Power Good (based onboth undervoltage and overvoltage detection). In addition, the shutdown pin of the IC can be usedfor providing start-up delay, and the soft-start pin can be used for implementing precise tracking,for the purpose of sequencing with respect to an external rail.
Feature
- Power stage input voltage from 1 V to 16 V
- Control stage input voltage from 3 V to 6 V
- Output voltage adjustable down to 0.6 V
- Power-good flag and shutdown
- Output overvoltage and undervoltage detection
- ±2% Feedback voltage accuracy over temperature
- Low-side adjustable current sensing
- Adjustable soft start
- Tracking and sequencing with shutdown and soft-start pins
- Switching frequency from 50 kHz to 1 MHz
- TSSOP-14 package
- Create a custom design using the LM2743 with the WEBENCH Power Designer
