Overview
The LM5117PSQX/NOPB is a synchronous buck controller designed by Texas Instruments for step-down regulator applications. It is particularly suited for high voltage or widely varying input supplies. The controller uses current mode control with an emulated current ramp, which provides inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation. This method reduces noise sensitivity, allowing reliable control of very small duty cycles necessary in high input voltage applications.
Key Specifications
| Specification | Value |
|---|---|
| Operating Voltage Range | 5.5 V to 65 V |
| Operating Temperature Range | -40°C to 125°C |
| Package Type | 24-Pin WQFN (RTW) |
| Package Size | 4.00 mm × 4.00 mm |
| Peak Gate Drive Current | 3.3 A |
| Operating Frequency Range | 50 kHz to 750 kHz |
| Voltage Reference Accuracy | 1.5% |
| Output Voltage Range | Programmable from 0.8 V |
| Current Limit | Programmable |
| Soft-Start and Tracking | Programmable |
| Line Undervoltage Lockout | Programmable |
| Thermal Shutdown | Yes |
Key Features
- AEC-Q100 Qualified for Automotive Applications
- 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 discontinuous mode operation
- 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
- Automotive Infotainment
- Industrial DC-DC Motor Drivers
- Automotive USB Power
- Telecom Server
Q & A
- What is the operating voltage range of the LM5117PSQX/NOPB?
The operating voltage range is from 5.5 V to 65 V. - What is the package type and size of the LM5117PSQX/NOPB?
The package type is 24-Pin WQFN (RTW) with a size of 4.00 mm × 4.00 mm. - What is the peak gate drive current of the LM5117PSQX/NOPB?
The peak gate drive current is 3.3 A. - What is the operating frequency range of the LM5117PSQX/NOPB?
The operating frequency range is from 50 kHz to 750 kHz. - Is the LM5117PSQX/NOPB qualified for automotive applications?
Yes, it is AEC-Q100 Qualified for automotive applications. - What is the voltage reference accuracy of the LM5117PSQX/NOPB?
The voltage reference accuracy is 1.5%. - Can the output voltage of the LM5117PSQX/NOPB be programmed?
Yes, the output voltage is programmable from 0.8 V. - Does the LM5117PSQX/NOPB have thermal shutdown protection?
Yes, it includes thermal shutdown protection. - What is the purpose of the diode emulation mode in the LM5117PSQX/NOPB?
The diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. - Can the LM5117PSQX/NOPB be synchronized with an external clock?
Yes, it supports free-run or synchronizable clock operation up to 750 kHz.
