LM5165-Q1

• AEC-Q100 Qualified for Automotive Applications
  • Device Temperature Grade 1: –40ºC to 125ºC Ambient Temperature Range
  • Device HBM ESD Classification Level 2
  • Device CDM ESD Classification Level C5
• Wide Input Voltage Range of 3 V to 65 V
• Fixed (3.3-V, 5-V) or Adjustable Output Voltages
• Maximum Output Current as High as 150 mA
• 10.5-µA No Load Quiescent Current
• –40°C to 150°C Junction Temperature Range
• Selectable PFM or COT Mode Operation
• Active Slew Rate Control for Low EMI
• 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)
• 1.223-V Internal Voltage Reference
• 900-µs Internal or Programmable Soft Start
• Monotonic Start-Up into Prebiased Output
• No Loop Compensation or Bootstrap Components
• Precision Enable and Input UVLO With Hysteresis
• Thermal Shutdown Protection With Hysteresis
• 10-Pin VSON and VSSOP Packages
• Create a Custom Regulator Design Using WEBENCH^® Power Designer

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The LM5165-Q1 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 either 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-Q1 is qualified to automotive AEC-Q100 grade 1 and is available in 10-pin VSON and VSSOP packages with 0.5-mm pin pitch.