• Up to 97% Efficiency and 93% Duty Cycle
• Wide Input Voltage Range of 3 V to 20 V
• Switching Frequency From 200 kHz to 1.2 MHz
• Inductor-DCR-Based Overcurrent Protection With Thermal Compensation
• 0.6-V Reference With 1% Feedback Accuracy
• 30-ns Min On-Time for Low VOUT
• Integrated High-Current MOSFET Drivers
  • Adaptive Deadtime Control
• Ultrafast Line and Load Transient Response
  • High GBW Error Amplifier
  • PWM Line Feedforward
• Integrated VDD Bias Supply LDO Subregulator
• Programmable System-Level OTP
• Precision Enable With Hysteresis
• Frequency Synchronization
• Monotonic Prebiased Start-up
• Programmable Soft-Start With Tracking
• Output Remote Sense
• Open-Drain Power Good Indicator
• 4-mm x 4-mm WQFN-24 PowerPAD™ Package

• DC-DC Converters and POL Modules
• Telecommunications Infrastructure
• Embedded Computing, Servers, Storage

The LM27403 is a feature-rich, easy-to-use, synchronous buck controller offering exceptional levels of integration and performance for superior efficiency in high power density, point-of-load (POL) DC-DC regulator solutions. The resistor-programmable switching frequency from 200 kHz to 1.2 MHz and integrated, high-current MOSFET gate drivers with adaptive deadtime offer flexibility to optimize solution size and maximize conversion efficiency.

High precision and low output voltage are easily obtained with a 0.6-V, 1% accurate voltage reference together with a 30-ns high-side MOSFET minimum controllable on-time. Using lossless inductor dc resistance (DCR) current sensing and an inexpensive 2N3904 BJT to sense temperature remotely at the inductor, the LM27403 supports accurate and thermally compensated overcurrent protection (OCP).