Texas Instruments LM5122/LM5122-Q1 Synchronous Boost Controllers
Texas Instruments LM5122/LM5122-Q1 Synchronous Boost Controllers are multiphase capable controllers intended for high-efficiency synchronous boost regulator applications. The control method is based upon peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation. The switching frequency is programmable up to 1MHz. Higher efficiency is achieved by two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode also enables discontinuous mode operation for improved efficiency at light load conditions.
An internal charge pump allows 100% duty cycle for high-side synchronous switch (bypass operation). A 180° phase-shifted clock output enables easy multiphase interleaved configuration. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit, and adjustable line undervoltage lockout. The LM5122-Q1 devices are AEC-Q100 qualified for automotive applications.
Features
- Available in AEC-Q100 (LM5122-Q1)
- 65V maximum input voltage
- Up to 100V output voltage
- Bypass (VOUT = VIN) operation
- 1.2V reference with ±1.0% accuracy
- Free-run/synchronizable switching to 1MHz
- Peak current mode control
- Robust 3A integrated gate drivers
- Adaptive dead-time control
- Optional diode emulation mode
- Programmable cycle-by-cycle current limit
- Hiccup mode overload protection
- Programmable line UVLO
- Programmable soft-start
- Thermal shutdown protection
- 9µA shutdown quiescent current
- Programmable slope compensation
- Programmable skip cycle mode reduces standby power
- Allows external VCC supply
- Inductor DCR current sensing capability
- Multiphase capability
- Thermally enhanced 20-pin HTSSOP
Applications
- 12V, 24V, and 48V power systems
- Automotive start-stop
- Audio power supplies
- High-current boost power supplies
Videos
Functional Block Diagram
Development Tools
Texas Instruments TPS92662AEVM6-104 Matrix Evaluation Module
The module consists of 66 individually controllable LEDs configured into a six-channel application.
Texas Instruments LM5122EVM-1PH Controller Evaluation Module (EVM)
Provides the engineer with a fully functional synchronous boost converter to evaluate the LM5122.
Texas Instruments LM5122EVM-2PH Controller Evaluation Module (EVM)
Provides a fully functional dual phase synchronous boost converter to evaluate the LM5122.
Texas Instruments PMLKBOOSTEVM Experiments Board
This boost experiments board has two sections using two other ICs, the TPS55340 and LM5122.