Texas Instruments LM5166 | Demoboard TIDA-01386

Description

The LM5166 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 500 mA of output current can be delivered at fixed output voltages of 3.3 V or 5 V, or 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 load 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 LM5166 is available in a 10-pin VSON package with 0.5-mm pin pitch.

Features

Wide Input Voltage Range of 3 V to 65 V9.7-µA No-Load Quiescent Current–40°C to 150°C Junction Temperature RangeFixed (3.3-V, 5-V) or Adjustable VOUT OptionsMeets EN55022 / CISPR 22 EMI StandardsIntegrated 1-Ω PFET Buck SwitchSupports 100% Duty Cycle for Low DropoutIntegrated 0.5-Ω NFET Synchronous RectifierEliminates External Schottky DiodeProgrammable Peak Current Limit Supports:500-mA, 300-mA, or 200-mA LoadsSelectable PFM or COT Mode Operation1.223-V ±1.2% Internal Voltage ReferenceSwitching Frequency up to 600 kHz900-µs Internal or Externally-Adjustable Soft StartDiode Emulation and Pulse Skipping for Ultra-High Light-Load EfficiencyNo Loop Compensation or Bootstrap ComponentsPrecision Enable and Input UVLO With HysteresisOpen-Drain Power Good IndicatorThermal Shutdown Protection With HysteresisPin-to-Pin Compatible With the LM516510-Pin, 3-mm × 3-mm VSON PackageCreate a Custom Regulator Design Using WEBENCH® Power Designer

Typical applications

• Industrial I/O Modules
• Programmable Logic Controllers (PLCs)
• Communication Modules
• Automotive,Fieldbus

More information

• Datasheet
• IC product information