Overview
The LM5116 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, 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 | Description | Value |
|---|---|---|
| Package | HTSSOP (PWP) | 20 pins |
| Operating Temperature Range | °C | -40 to 150 |
| Operating Frequency | Programmable frequency range | 50 kHz to 1 MHz |
| Input Voltage Range | V | Up to 100 V |
| Output Voltage Range | V | 1.215 V to 80 V |
| Voltage Reference Accuracy | % | 1.5% |
| Peak Gate Drive Current | A | 3.5 A |
| Quiescent Current in Shutdown | µA | < 10 µA |
Key Features
- Emulated peak current mode control
- Wide operating 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 to 1 MHz
- Optional diode emulation mode for improved efficiency at light load conditions
- Programmable output from 1.215 V to 80 V
- Precision 1.5% voltage reference
- Programmable current limit and soft start
- Programmable line under-voltage lockout
- Automatic switch to external bias supply
- HTSSOP-20 exposed pad for improved thermal dissipation
- Thermal shutdown
Applications
The LM5116 is suitable for a variety of high-voltage step-down regulator applications, including:
- Industrial power supplies
- Automotive systems
- Telecommunications equipment
- High-voltage DC-DC converters
- Power supplies for medical devices
Q & A
- What is the primary function of the LM5116?
The LM5116 is a synchronous buck controller designed for step-down regulator applications from high-voltage or widely varying input supplies.
- What is the operating frequency range of the LM5116?
The operating frequency is programmable from 50 kHz to 1 MHz.
- What is the input voltage range of the LM5116?
The LM5116 can operate with input voltages up to 100 V.
- What is the output voltage range of the LM5116?
The output voltage can be programmed from 1.215 V to 80 V.
- What is the quiescent current in shutdown mode?
The quiescent current in shutdown mode is less than 10 µA.
- Does the LM5116 support diode emulation mode?
- What type of MOSFETs can the LM5116 drive?
The LM5116 can drive standard or logic level MOSFETs.
- What is the peak gate drive current of the LM5116?
The peak gate drive current is 3.5 A.
- Does the LM5116 have thermal shutdown protection?
- What package type is the LM5116 available in?
The LM5116 is available in an HTSSOP-20 package with an exposed pad.
