Overview
The LM5117PSQ/NOPB is a synchronous buck controller designed by Texas Instruments for step-down regulator applications. It operates over a wide input voltage range of 5.5 V to 65 V, making it suitable for high voltage or widely varying input supplies. The controller uses current mode control with an emulated current ramp, providing inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation. This design allows for reliable control of very small duty cycles necessary in high input voltage applications.
Key Specifications
| Specification | Value |
|---|---|
| Part Number | LM5117PSQ/NOPB |
| Manufacturer | Texas Instruments |
| Input Voltage Range | 5.5 V to 65 V |
| Package Type | WQFN-24 |
| Operating Temperature Range | -40°C to 125°C |
| Operating Frequency Range | 50 kHz to 750 kHz |
| Peak Gate Drive Current | 3.3 A |
| Voltage Reference Accuracy | 1.5% |
| Analog Current Monitor | Yes |
| Programmable Current Limit | Yes |
| Thermal Shutdown | Yes |
Key Features
- Emulated Peak Current Mode Control
- Robust 3.3-A Peak Gate Drives
- Adaptive Dead-Time Output Driver Control
- Free-Run or Synchronizable Clock up to 750 kHz
- Optional Diode Emulation Mode for improved efficiency at light load conditions
- Programmable Output from 0.8 V
- Precision 1.5% Voltage Reference
- Analog Current Monitor
- Programmable Current Limit
- Hiccup Mode Overcurrent Protection
- Programmable Soft-Start and Tracking
- Programmable Line Undervoltage Lockout
- Programmable Switchover to External Bias Supply
- Thermal Shutdown
Applications
The LM5117PSQ/NOPB is designed for various step-down regulator applications, particularly in systems requiring a wide input voltage range. It is suitable for automotive systems, industrial power supplies, and other high-reliability applications where robust and efficient power conversion is necessary. The controller's ability to operate in harsh environments and its compliance with automotive standards (AEC-Q100) make it an ideal choice for automotive electronics.
Q & A
- What is the input voltage range of the LM5117PSQ/NOPB? The input voltage range is from 5.5 V to 65 V.
- What is the package type of the LM5117PSQ/NOPB? The package type is WQFN-24.
- What is the operating temperature range of the LM5117PSQ/NOPB? The operating temperature range is -40°C to 125°C.
- What is the maximum operating frequency of the LM5117PSQ/NOPB? The maximum operating frequency is up to 750 kHz.
- Does the LM5117PSQ/NOPB have an analog current monitor? Yes, it does.
- Is the LM5117PSQ/NOPB AEC-Q100 qualified? Yes, it is AEC-Q100 qualified for automotive applications.
- What is the precision of the voltage reference in the LM5117PSQ/NOPB? The voltage reference accuracy is 1.5%.
- Does the LM5117PSQ/NOPB support programmable current limit? Yes, it does.
- What protection features does the LM5117PSQ/NOPB have? It includes hiccup mode overcurrent protection and thermal shutdown.
- Can the LM5117PSQ/NOPB operate in diode emulation mode? Yes, it can operate in diode emulation mode for improved efficiency at light load conditions.
