Packaging information
| Package | Pins VSON (DRC) | 10 |
| Operating temperature range (°C) -40 to 150 |
| Package qty | Carrier 250 | SMALL T&R |
Features for the LM5166
- Wide Input Voltage Range of 3 V to 65 V
- 9.7-µA No-Load Quiescent Current
- –40°C to 150°C Junction Temperature Range
- Fixed (3.3-V, 5-V) or Adjustable VOUT Options
- Meets EN55022 / CISPR 22 EMI Standards
- Integrated 1-Ω PFET Buck
Switch
- Supports 100% Duty Cycle for Low Dropout
- Integrated 0.5-Ω NFET Synchronous
Rectifier
- Eliminates External Schottky Diode
- Programmable Peak Current Limit
Supports:
- 500-mA, 300-mA, or 200-mA Loads
- Selectable PFM or COT Mode Operation
- 1.223-V ±1.2% Internal Voltage Reference
- Switching Frequency up to 600 kHz
- 900-µs Internal or Externally-Adjustable Soft Start
- Diode Emulation and Pulse Skipping for Ultra-High Light-Load Efficiency
- No Loop Compensation or Bootstrap Components
- Precision Enable and Input UVLO With Hysteresis
- Open-Drain Power Good Indicator
- Thermal Shutdown Protection With Hysteresis
- Pin-to-Pin Compatible With the LM5165
- 10-Pin, 3-mm × 3-mm VSON Package
- Create a Custom Regulator Design Using WEBENCH® Power Designer
Description for the LM5166
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.