LM5117

ACTIVE

5.5-65V Wide Vin, Current Mode Synchronous Buck Controller with 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) (mA) 4.8 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 Catalog 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 BOARDS Download
document-generic User guide
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 MODELS Download
SNVM040A.ZIP (82 KB) - PSpice Model
SIMULATION MODELS Download
SNVM619A.TSC (1077 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVM620A.ZIP (30 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SNVM960.ZIP (357 KB) - PSpice Model
SIMULATION TOOLS 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 TOOLS Download

Reference designs

REFERENCE DESIGNS Download
450W High Efficiency 25V Buck Converter Reference Design
PMP20808 — PMP20808 is a single-phase synchronous cuck converter reference design using the LM5117 controller IC. The design accepts an input voltage of 36Vin to 40Vin (38Vin Nominal) and provides an output of 25Vout capable of supplying 18A of continuous current to the load. The design was built on the (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
100W Negative Output Power Supply Reference Design for Industrial Applications
PMP20904 — The PMP20904 reference design is a negative buck utilizing the LM5117 controller for industrial applications. This design can operate at 24Vin at +/-10%. The design has an output of -24V and capable of sourcing 2A continuous current and up to 4A transient. Switching frequency is set to 200kHz (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Power Small Form Factor Synchronous Buck To Output 12V@15A Reference Design
PMP10852B The PMP10852B reference design uses the LM5117, CSD18563 for the high side MOSFET and CSD18532 (x2) for the low side MOSFETs.  PMP10852B takes input voltages between 27V to 41V and outputs 180W(12V @15A).  The size is very small, total area is 1,200mm2 (30mm x 40mm) solution size. The (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Power Small Form Factor Synchronous Buck To Output 12V@15A Reference Design
PMP10852 The PMP10852 reference design uses the LM5117, CSD18563 for the high side MOSFET and CSD18532 (x2) for the low side MOSFETs.  PMP10852 takes input voltages between 27V to 41V and outputs 180W(12V @15A).  The size is very small, total area is 1,200mm2 (30mm x 40mm) solution size. The design (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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

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