LM5165YDRCT Power Regulator IC Switching Voltage Regulators 3V-65V, 150mA Sync Buck Converter

1 Features

• 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

   

2 Applications

• 4–20 mA Loop-Powered Sensors

• Automotive and Battery-Powered Equipment

• High-Voltage LDO Replacement

• Industrial Control Systems

• General-Purpose Bias Supplies

3 Description

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 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.

Device Information