LM5116WG

LM5116WG www.ti.com SNVS599D – OCTOBER 2008 – REVISED FEBRUARY 2013 LM5116WG Wide Range Synchronous Buck Controller Check for Samples: LM5116WG FEATURES 1 2 Hermetic Package for Harsh Operating Environments Emulated Peak Current Mode Wide Operating Range up to 100V Low IQ Shutdown (< 10 µA) Drives Standard or Logic Level MOSFETs Robust 3.5A Peak Gate Drive Free-Run or Synchronous Operation to 1 MHz Optional Diode Emulation Mode Programmable Output from 1.215V to 80V Precision 1.5% Voltage Reference Programmable Current Limit Programmable Soft-Start Programmable Line Under-Voltage Lockout Automatic Switch to External Bias Supply CPGA-20 with No Thermal Shutdown DESCRIPTION The LM5116WG 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 utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle by cycle 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 LM5116WG drives external high-side and low-side NMOS power switches with adaptive deadtime control. A user-selectable diode emulation mode enables discontinuous mode...