Overview
The LM25116 is a synchronous buck controller designed for step-down regulator applications from high voltage or widely varying input supplies. It is manufactured by Texas Instruments and is part of their power management product line. The controller uses current mode control with an emulated current ramp, providing inherent line feedforward, 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 |
|---|---|
| Control Mode | Current Mode |
| Input Voltage Range | 6 V to 42 V |
| Output Voltage Range | 1.215 V to 36 V |
| Switching Frequency Range | 50 kHz to 1 MHz |
| Maximum Output Current | Up to 20 A |
| Quiescent Current (Typical) | 4.6 mA |
| Operating Temperature Range | -40°C to 125°C |
| Package Type | 20-pin HTSSOP |
| Package Quantity | 73 per tube |
Key Features
- Emulated peak current mode control
- Wide operating range (up to 42 V)
- Low IQ 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
- Programmable output from 1.215 V to 36 V
- Precision 1.5% voltage reference
- Programmable current limit and soft start
- Programmable line undervoltage lockout
- Automatic switch to external bias supply
- Thermal shutdown
Applications
The LM25116 is suitable for various high-efficiency DC/DC converter applications, particularly in power, server and storage, automotive, and industrial sectors. It is used in scenarios requiring step-down regulation from high or varying input voltages.
Q & A
- What is the input voltage range of the LM25116? The input voltage range is from 6 V to 42 V.
- What is the output voltage range of the LM25116? The output voltage range is from 1.215 V to 36 V.
- What is the switching frequency range of the LM25116? The switching frequency range is from 50 kHz to 1 MHz.
- What type of control mode does the LM25116 use? The LM25116 uses current mode control with an emulated current ramp.
- What is the quiescent current in shutdown mode? The quiescent current in shutdown mode is less than 10 µA.
- Can the LM25116 drive logic level MOSFETs? Yes, the LM25116 can drive both standard and logic level MOSFETs.
- What is the maximum output current capability of the LM25116? The maximum output current capability is up to 20 A.
- What is the operating temperature range of the LM25116? The operating temperature range is from -40°C to 125°C.
- Does the LM25116 have thermal shutdown protection? Yes, the LM25116 includes thermal shutdown protection.
- Is the LM25116 available in evaluation boards? Yes, an evaluation board (LM25116EVAL) is available for the LM25116.
