LM5141

• –40ºC to +125ºC Ambient Operating Temperature Range
• An AEC-Q100 Qualified Device is Available
• V_IN 3.8 V to 65 V (70 V Absolute Maximum)
• Output: Fixed 3.3 V, 5 V, or Adjustable From
  1.5 V - 15 V with ±0.8% Accuracy
• Fixed 2.2 MHz or 440 kHz Switching Frequency with ±5% Accuracy
• High-Side and Low-Side Gate Drive With Slew Rate Control
• Optional Frequency Shift by Varying an Analog Voltage or RT Resistor
• Optional Synchronization to an External Clock
• Optional Spread Spectrum
• Shutdown Mode I_Q: 10 µA Typical
• Low Standby Mode I_Q: 35 µA Typical
• 75 mV Current Limit Threshold with ±0.9% Accuracy
• External Resistor or DCR Current Sensing
• Output Enable Logic Input
• Hiccup Mode for Sustained Overload
• Power Good Indication Output
• Selectable Diode Emulation or Forced Pulse Width Modulation
• QFN-24 Package with Wettable Flanks
• Create a Custom Design Using the LM5141 With the WEBENCH^® Power Designer

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The LM5141 is a synchronous buck controller, intended for high voltage wide V_IN step-down converter applications. The control method is peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation. The LM5141 features slew rate control to simplify the compliance with EMI requirements.

The LM5141 has two selectable switching frequencies: 2.2 MHz and 440 kHz. Gate Drivers with Slew Rate Control that can be adjusted to reduce EMI.

In light or no-load conditions, the LM5141 operates in skip cycle mode for improved low power efficiency. The LM5141 has a high voltage bias regulator with automatic switch-over to an external bias to reduce the I_Q current from V_IN. Additional features include frequency synchronization, cycle-by-cycle current limit, hiccup mode fault protection for sustained overload, and power good output.