Overview
The LM5116MHX/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 employs current mode control using 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. The LM5116 is available in a power-enhanced HTSSOP-20 package with an exposed die attach pad to aid thermal dissipation.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 6 V to 100 V |
| Output Current | Up to 3.5 A |
| Operating Frequency | Programmable from 50 kHz to 1 MHz |
| Output Voltage Range | Programmable from 1.215 V to 80 V |
| Voltage Reference Accuracy | ±1.5% |
| Quiescent Current in Shutdown | < 10 µA |
| Package Type | HTSSOP-20 with exposed pad |
| Operating Temperature Range | -40°C to 150°C |
| Thermal Shutdown | Yes |
Key Features
- Emulated peak current mode control
- Wide operating input voltage range up to 100 V
- Low quiescent current shutdown (< 10 µA)
- Drives standard or logic level MOSFETs
- Robust 3.5-A peak gate drive
- Free-run or synchronous operation up to 1 MHz
- Optional diode emulation mode for improved efficiency at light load conditions
- Programmable output voltage, current limit, and soft start
- Programmable line undervoltage lockout
- Automatic switch to external bias supply for improved efficiency
- Thermal shutdown and frequency synchronization
Applications
The LM5116MHX/NOPB is suitable for a variety of applications requiring high-efficiency step-down voltage regulation from high or variable input voltages. These include but are not limited to:
- Industrial power supplies
- Automotive systems
- Telecommunications equipment
- Server and data center power supplies
- High-voltage DC-DC conversion in various industrial and commercial systems
Q & A
- What is the input voltage range of the LM5116MHX/NOPB? The input voltage range is from 6 V to 100 V.
- What is the maximum output current of the LM5116MHX/NOPB? The maximum output current is up to 3.5 A.
- What is the operating frequency range of the LM5116MHX/NOPB? The operating frequency is programmable from 50 kHz to 1 MHz.
- What is the quiescent current in shutdown mode? The quiescent current in shutdown mode is less than 10 µA.
- Does the LM5116MHX/NOPB support diode emulation mode? Yes, it supports diode emulation mode for improved efficiency at light load conditions.
- What is the package type of the LM5116MHX/NOPB? The package type is HTSSOP-20 with an exposed pad.
- What is the operating temperature range of the LM5116MHX/NOPB? The operating temperature range is from -40°C to 150°C.
- Does the LM5116MHX/NOPB have thermal shutdown protection? Yes, it has thermal shutdown protection.
- Can the LM5116MHX/NOPB drive logic level MOSFETs? Yes, it can drive both standard and logic level MOSFETs.
- Is the LM5116MHX/NOPB RoHS compliant? Yes, it is RoHS compliant.
