LM5117-Q1

ACTIVE

Automotive Grade 5.5-65V Wide Vin, Current Mode Synchronous Buck Controller w Analog Current Monitor

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Product details

Parameters

Vin (Min) (V) 5.5 Vin (Max) (V) 65 Vout (Min) (V) 0.8 Vout (Max) (V) 62 Iout (Max) (A) 20 Iq (Typ) (uA) 4800 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 750 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Synchronous Rectification, Tracking, UVLO Adjustable Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Number of Phases 1 Rating Automotive open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 WQFN (RTW) 24 16 mm² 4 x 4 open-in-new Find other Buck controllers (external switch)

Features

  • LM5117-Q1 is Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: -40°C to 125°C
      Ambient Operating Temperature Range
  • Emulated Peak Current Mode Control
  • Wide Operating Range from 5.5 V to 65 V
  • Robust 3.3-A Peak Gate Drives
  • Adaptive Dead-Time Output Driver Control
  • Free-Run or Synchronizable Clock up to 750 kHz
  • Optional Diode Emulation Mode
  • Programmable Output from 0.8 V
  • Precision 1.5% Voltage Reference
  • Analog Current Monitor
  • Programmable Current Limit
  • Hiccup Mode Overcurrent Protection
  • Programmable Soft-Start and Tracking
  • Programmable Line Undervoltage Lockout
  • Programmable Switchover to External Bias Supply
  • Thermal Shutdown
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Description

The LM5117 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 750 kHz. The LM5117 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 high voltage bias regulator that allows external bias supply further improves efficiency. The LM5117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit, and adjustable line undervoltage lockout.

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Technical documentation

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
75
Description

The LM5117 evaluation board provides the design engineer with a fully functional synchronous buck converter based on Emulated Current Mode Control to evaluate the LM5117 controller IC. The evaluation board provides 12V output with a 9A current capability in addition with average output current (...)

Design tools & simulation

SIMULATION MODEL Download
SNVM040A.ZIP (82 KB) - PSpice Model
SIMULATION MODEL Download
SNVM960.ZIP (357 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CALCULATION TOOL Download

Reference designs

REFERENCE DESIGNS Download
12V, 80W Sync-Buck Reference Design
PMP30301 — The PMP30301 reference design is based on the LM5117 sync buck converter; it supplies 12V @ 6.5A and it is protected against overcurrent at 7.4A. The internal bias can be supplied internally by means of internal linear regulator, or externally by BJT and Zener diode, thus reducing power (...)
document-generic Schematic
REFERENCE DESIGNS Download
24V, 300W Sync-Buck Reference Design
PMP30189 — The PMP30189 reference design is based on the LM5117 sync buck converter; it supplies 24V @ 11A and it is protected against overcurrent at 13.9A. The internal bias can be supplied internally by means of internal linear regulator, or externally by BJT and Zener diode, thus reducing power (...)
document-generic Schematic
REFERENCE DESIGNS Download
Wide Vin Synchronous Buck Converter Reference Design for Small Form Factor
PMP20089 — The PMP20089 reference design has an input voltage range from 10V to 55Vin. The output is 4V @ 12 A and is optimized for efficiency and small solution size.
document-generic Schematic

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options
WQFN (RTW) 24 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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