The LM3017LEX/NOPB device is a versatile low-side NFET controller incorporating true shutdown and input side current limiting. The LM3017LEX/NOPB is designed for simple implementation of boost conversions in Thunderbolt Technology. The LM3017LEX/NOPB can also be configured for flyback or SEPIC designs. The input voltage range of 5 V to 18 V accommodates a two- or three-cell lithium ion battery or a 12-V rail. The enable pin accepts a single input to drive three different modes of operation: boost, pass-through, or shutdown mode. The LM3017LEX/NOPB draws very low current in shutdown mode, typically 40 nA from the input supply.
The LM3017LEX/NOPB provides an adjustable output to drive the Power Load Switch or MUX for the host Thunderbolt port. The ability to drive an external high-side NMOS provides for true isolation of the load from the input. Current limiting on the input ensures that inrush and short-circuit currents are always under control. The LM3017LEX/NOPB incorporates built-in thermal shutdown, cycle-by-cycle current limit, short-circuit protection, output overvoltage protection, and soft start. It is available in a 10-pin WQFN package.
Feature
- Fully Compliant to Thunderbolt Technology Specifications
- True Shutdown for Short-Circuit Protection
- Input Side Current Limit
- Single Enable Pin With Three Modes of Operation: Boost, Pass-Through, or Shutdown
- Built-in Charge Pump for High-Side NFET Disconnect Switch
- 1-A Push-Pull Driver for Low-Side NFET
- Peak Current Mode Control
- Simple Slope Compensation
- Protection Features: Thermal Shutdown, Cycle-by-Cycle Current Limit, Short-Circuit Protection, Output Overvoltage Protection, and Latch-Off
- Internal Soft Start
- Input Voltage Range: 5 V to 18 V
- 600-kHz Fixed Frequency Operation
- ±1% Reference Voltage Accuracy Over Temperature
- Low Shutdown Current (< 1 μA), 40 nA Typical
- 2.4 mm × 2.7 mm × 0.8 mm, 10-Pin WQFN Package
