Overview
The LM25116MH/NOPB is a synchronous buck controller designed by Texas Instruments for step-down regulator applications. It is intended to operate from high voltage or widely varying input supplies. 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 method reduces noise sensitivity, allowing reliable control even at very small duty cycles necessary in high input voltage applications.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Package | 20-pin HTSSOP (PWP) | |
| Operating Temperature Range | -40 to 125 | °C |
| Input Voltage Range | 6 V to 42 V | V |
| Output Voltage Range | 1.215 V to 36 V | V |
| Switching Frequency Range | 50 kHz to 1 MHz | Hz |
| Peak Gate Drive Current | 3.5 A | A |
| Quiescent Current in Shutdown | < 10 µA | A |
| Voltage Reference Accuracy | 1.5% |
Key Features
- Emulated peak current mode control
- Wide operating range up to 42 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
- 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
- Adaptive dead-time control for high-side and low-side NMOS power switches
Applications
The LM25116MH/NOPB is suitable for various applications, including:
- Power supplies for industrial control systems
- Telecommunications equipment
- Automotive systems
- DC/DC power modules
- Point-of-load regulation in distributed power systems
Q & A
- What is the input voltage range of the LM25116MH/NOPB?
The input voltage range is from 6 V to 42 V.
- What is the output voltage range of the LM25116MH/NOPB?
The output voltage is programmable from 1.215 V to 36 V.
- What is the switching frequency range of the LM25116MH/NOPB?
The switching 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 LM25116MH/NOPB support diode emulation mode?
Yes, it supports an optional diode emulation mode for improved efficiency at light load conditions.
- What type of package does the LM25116MH/NOPB come in?
The device is available in a 20-pin HTSSOP (PWP) package with an exposed die attach pad.
- What are the key protection features of the LM25116MH/NOPB?
The key protection features include thermal shutdown, overcurrent protection, and input undervoltage lockout.
- Can the LM25116MH/NOPB operate in synchronous or free-run mode?
Yes, it can operate in either free-run or synchronous mode up to 1 MHz.
- What is the precision of the voltage reference in the LM25116MH/NOPB?
The voltage reference has a precision of 1.5%.
- Is the LM25116MH/NOPB suitable for automotive applications?
Yes, it is suitable for automotive systems among other applications.
