LM5165

• Wide Input Voltage Range of 3 V to 65 V
• 10.5-µA No-Load Quiescent Current
• –40°C to 150°C Junction Temperature Range
• Fixed (3.3-V, 5-V) or Adjustable Output Voltages
• Meets EN55022 / CISPR 22 EMI Standards
• Integrated 2-Ω PMOS Buck Switch
  • Supports 100% Duty Cycle for Low Dropout
• Integrated 1-Ω NMOS Synchronous Rectifier
  • Eliminates External Rectifier Diode
• Programmable Current Limit Setpoint (4 Levels)
• Selectable PFM or COT Mode Operation
• 1.223-V ±1% Internal Voltage Reference
• 900-µs Internal or Programmable Soft Start
• Active Slew Rate Control for Low EMI
• Diode Emulation Mode and Pulse Skipping for Ultra-High Light-Load Efficiency Performance
• Monotonic Start-Up into Prebiased Output
• No Loop Compensation or Bootstrap Components
• Precision Enable and Input UVLO With Hysteresis
• Pin-to-pin Compatible With the LM5166
• Thermal Shutdown Protection With Hysteresis
• 10-Pin, 3-mm × 3-mm VSON Package
• Create a Custom Regulator Design Using WEBENCH^® Power Designer

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The LM5165 device is a compact, easy-to-use, 3-V to 65-V, ultra-low I_Q synchronous buck converter with high efficiency over wide input voltage and load current ranges. With integrated high-side and low-side power MOSFETs, up to 150-mA of output current can be delivered at fixed output voltages of 3.3 V or 5 V or at an adjustable output. The converter is designed to simplify implementation while providing options to optimize the performance for the target application. Pulse Frequency Modulation (PFM) mode is selected for optimal light-load efficiency or Constant On-Time (COT) control for nearly constant operating frequency. Both control schemes do not require loop compensation while providing excellent line and load transient response and short PWM on-time for large step-down conversion ratios.

The high-side P-channel MOSFET can operate at 100% duty cycle for lowest dropout voltage and does not require a bootstrap capacitor for gate drive. Also, the current limit setpoint is adjustable to optimize inductor selection for a particular output current requirement. Selectable and adjustable start-up timing options include minimum delay (no soft start), internally fixed (900 µs), and externally programmable soft start using a capacitor. An open-drain PGOOD indicator can be used for sequencing, fault reporting, and output voltage monitoring. The LM5165 buck converter is available in a 10-pin, 3-mm × 3-mm, thermally-enhanced VSON-10 package with 0.5-mm pin pitch.