Overview
The LM5117PMHE/NOPB is a synchronous buck controller designed by Texas Instruments for step-down regulator applications. It is particularly suited for use with high voltage or widely varying input supplies. The controller operates using 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
| Parameter | Value |
|---|---|
| Package | 20-PowerTSSOP (0.173, 4.40mm Width) |
| Number of Pins | 20 |
| Operating Temperature Range | -40°C to 125°C TJ |
| Input Voltage Range | 5.5 V to 65 V |
| Output Voltage Range | 0.8 V to 62 V |
| Maximum Output Current | 20 A |
| Switching Frequency Range | 50 kHz to 750 kHz |
| Quiescent Current | 4.8 mA |
| Control Technique | Pulse Width Modulation (PWM) |
| Control Mode | Current Mode |
| Synchronous Rectifier | Yes |
| Topology | Buck |
| Output Type | Transistor Driver |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
| Packaging | TUBE |
Key Features
- Programmable operating frequency from 50 kHz to 750 kHz.
- Adaptive dead-time control for external high-side and low-side NMOS power switches.
- User-selectable diode emulation mode for discontinuous mode operation and improved efficiency at light load conditions.
- High voltage bias regulator allowing external bias supply for improved efficiency.
- Analog telemetry feature providing average output current information.
- Thermal shutdown, frequency synchronization, hiccup mode current limit, and adjustable line undervoltage lockout.
- Robust 3.3-A peak gate drives.
- Programmable output from 0.8 V with a precision 1.5% voltage reference.
- Programmable current limit, soft-start, and tracking.
Applications
The LM5117PMHE/NOPB is suitable for a variety of applications requiring efficient step-down voltage regulation from high or variable input voltages. These include:
- Automotive systems, given its AEC-Q100 qualification.
- Industrial power supplies where high reliability and efficiency are crucial.
- Telecommunications and networking equipment requiring stable and efficient power conversion.
- Consumer electronics that need compact and efficient power management solutions.
Q & A
- What is the input voltage range of the LM5117PMHE/NOPB?
The input voltage range is from 5.5 V to 65 V.
- What is the maximum output current of the LM5117PMHE/NOPB?
The maximum output current is 20 A).
- What is the switching frequency range of the LM5117PMHE/NOPB?
The switching frequency range is from 50 kHz to 750 kHz).
- Does the LM5117PMHE/NOPB support frequency synchronization?
- What is the operating temperature range of the LM5117PMHE/NOPB?
- Is the LM5117PMHE/NOPB RoHS compliant?
- What is the package type of the LM5117PMHE/NOPB?
- Does the LM5117PMHE/NOPB have thermal shutdown protection?
- Can the LM5117PMHE/NOPB operate in diode emulation mode?
- What is the quiescent current of the LM5117PMHE/NOPB?
