TI LM25116MHX/NOPB

The LM25116 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-bycycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The operating frequency is programmable from 50 kHz to 1 MHz. The LM25116 drives external high-side and low-side NMOS power switches with adaptive deadtime control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A low quiescent current shutdown disables the controller and consumes less than 10 μA of total input current. Additional features include a high voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle-by-cycle current limit and adjustable line undervoltage lockout. The device is available in a power enhanced 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.

• Emulated Peak Current Mode
• Wide Operating Range (Up to 42 V)
• Low I_Q 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
• Programmable Soft Start
• Programmable Line Undervoltage Lockout
• Automatic Switch to External Bias Supply
• 20-Pin HTSSOP Exposed Pad
• Thermal Shutdown

• Automotive Infotainment
• Industrial DC-DC Motor Drivers
• Automotive USB Adapters
• Telecom Servers