LM5145 - Texas Instruments

LM5145 Synchronous Buck DC-DC Controller

The LM5145 75-V synchronous buck controller regulates from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns gives large step-down ratios, enabling the direct step-down conversion from a 48-V nominal input to low-vol.

Features

2 Applications
• Versatile synchronous buck DC/DC controller
  – Wide input voltage range of 6 V to 75 V
  – 0.8-V reference with ±1% feedback accuracy
  – Adjustable output voltage from 0.8 V to 60 V
  – 40-ns tON(min) for high VIN / VOUT ratio
  – 140-ns tOFF(min) for low dropout
  – Optimized for CISPR 32 requirements
• Switching frequency from 100 kHz to 1 MHz
  – SYNC In and SYNC Out capability
  – Selectable diode emulation or FPWM
• 7.5-V gate drivers for standard VTH MOSFETs
  – 14-ns adaptive dead-time control
  – 2.3-A source and 3.5-A sink capability
  – Low-side soft start for prebiased start-up
• Fas.