TI LM5165DRCR

The LM5165 device is a compact, easy-to-use, 3-V to 65-V, ultra-low IQ synchronous buck converter with high efficiency over wide input voltage and load current ranges. With integrated high-side and lowside 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 ontime 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.

• 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

• 4-20 mA Loop-Powered Sensors
• Automotive and Battery-Powered Equipment
• High-Voltage LDO Replacement
• Industrial Control Systems
• General-Purpose Bias Supplies