Texas Instruments LM5165

Description

Wide VIN Synchronous Buck Converter Powers Smart SensorsThe LM5165 is a compact, easy-to-use, 3-V to 65-V,ultra-low IQ synchronous buck converter with highefficiency over wide input voltage and load currentranges. With integrated high-side and low-side powerMOSFETs, up to 150-mA of output current can bedelivered at fixed output voltages of 3.3 V or 5 V, oran adjustable output. The converter is designed tosimplify implementation while providing options tooptimize the performance the target application.Pulse Frequency Modulation (PFM) mode is selectedfor optimal light-load efficiency or Constant On-Time(COT) control for nearly constant operatingfrequency. Both control schemes do not require loopcompensation while providing excellent line and loadtransient response and short PWM on-time for largestep-down conversion ratios.The high-side p-channel MOSFET can operate at100% duty cycle for lowest dropout voltage and doesnot require a bootstrap capacitor for gate drive. Also,the current limit setpoint is adjustable to optimizeinductor selection for a particular output currentrequirement. Selectable/adjustable startup timingoptions include minimum delay (no soft start),internally fixed (900 μs), and externally programmablesoft start via an external capacitor. An open-drainPGOOD indicator can be used for sequencing andoutput voltage monitoring. The LM5165 is qualified toautomotive AEC-Q100 grade 1 and is available in aVSON-10 package with 0.5-mm pin pitch

Features

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
• Switching Frequency as High as 600 kHz
• Diode Emulation Mode and Pulse Skipping forUltra-High Light-Load Efficiency Performance
• 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 Startup into Pre-Biased Output
• No Loop Compensation or Bootstrap Components
• Precision Enable/Input UVLO with Hysteresis
• Open-Drain Power Good Indicator
• Active Slew Rate Control for Low EMI
• Thermal Shutdown Protection with Hysteresis
• 10-Lead, 3-mm x 3-mm VSON Package

Typical applications

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

More information

• Datasheet
• IC product information