LM5116-HT Datasheet, PDF (1/34 Pages) Texas Instruments – WIDE RANGE SYNCHRONOUS BUCK CONTROLLER

LM5116-HT
www.ti.com
SLVSBS8A – OCTOBER 2013 – REVISED OCTOBER 2013
WIDE RANGE SYNCHRONOUS BUCK CONTROLLER
Check for Samples: LM5116-HT
FEATURES
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•2 Emulated Peak Current Mode
• Wide Operating Range Up to 80 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 80 V
• Precision 1.5% Voltage Reference
• Programmable Current Limit
• Programmable Soft-Start
• Programmable Line Under-Voltage Lockout
• Automatic Switch to External Bias Supply
APPLICATIONS
• Down-Hole Drilling
• High Temperature Environments
SUPPORTS EXTREME TEMPERATURE
APPLICATIONS
• Controlled Baseline
• One Assembly and Test Site
• One Fabrication Site
• Available in Extreme (–55°C to 175°C)
Temperature Range
• Extended Product Life Cycle
• Extended Product-Change Notification
• Product Traceability
• Texas Instruments' high temperature products
utilize highly optimized silicon (die) solutions
with design and process enhancements to
maximize performance over extended
temperatures.
DESCRIPTION
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 50 kHz to 1 MHz. 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 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 under-voltage lockout.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated