Texas Instruments LM25117 Synchronous Buck Controllers
Texas Instruments LM25117 Synchronous Buck Controllers are intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. TI LM25117 Synchronous Buck Controllers drive external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. Efficiency is further improved by a high voltage bias regulator that allows external bias supply. LM25117 provides a unique analog telemetry feature that offers average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit, and adjustable line undervoltage lockout.
Features
- LM25117Q is an automotive-grade product that is AEC-Q100 grade 1 qualified (-40°C to +125°C operating junction temperature)
- Emulated peak current mode control
- Wide operating range from 4.5V to 42V
- Robust 3.3A peak gate drives
- Adaptive dead-time output driver control
- Free-run or synchronizable clock up to 750kHz
- Optional diode emulation mode
- Programmable output from 0.8V
- Precision 1.5% voltage reference
- Analog current monitor
- Programmable current limit
- Hiccup mode over current protection
- Programmable soft-start and tracking
- Programmable line undervoltage lockout
- Programmable switch-over to external bias supply
- Thermal shutdown
Applications
- Step-down regulator
- High voltage
- Widely varying input supply
Typical Application
Development Tool
Published: 2012-04-27
| Updated: 2022-03-11