LM5116

If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and specifications.
VIN to GND............................................. -0.3V to 100V
VCC, VCCX, UVLO to GND (Note 3)............. -0.3 to 16V
SW, CS to GND........................................ -3.0 to 100V
HB to SW ...................................................-0.3 to 16V
HO to SW........................................... -0.3 to HB+0.3V
VOUT to GND........................................... -0.3 to 100V
CSG to GND .................................................-1V to 1V
LO to GND ......................................-0.3 to VCC+0.3V
SS to GND.................................................. -0.3 to 7V
FB to GND ..................................................-0.3 to 7V
DEMB to GND ...........................................-0.3 to VCC
RT to GND ..................................................-0.3 to 7V
EN to GND .............................................-0.3 to 100V
ESD Rating HBM (Note 2) ...................................2 kV
Storage Temperature Range....... -55°C to +150°C
Junction Temperature .................................+150°C

The LM5116 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 50kHz to 1MHz. The LM5116 drives 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. A low quiescent current sleep mode disables the controller and consumes less than 10A 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 under-voltage lockout. The device is available in a power enhanced TSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.