LM25117-Q1

ACTIVE

Automotive Grade 4.5-42V Wide Vin, Current Mode Synchronous Buck Controller with Tracking

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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 0.8 Vout (Max) (V) 41 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 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

  • LM25117-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 4.5 V to 42 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 Over Current Protection
  • Programmable Soft-start and Tracking
  • Programmable Line Undervoltage Lockout
  • Programmable Switch-over to External Bias Supply
  • Thermal Shutdown

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Description

The LM25117 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 LM25117 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 LM25117’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

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet LM25117/Q1 Wide Input Range Synchronous Buck Controller With Analog Current Monitor datasheet (Rev. F) Aug. 27, 2015
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) Jul. 03, 2018
Application note Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics Jul. 21, 2016
User guide AN-2065 LM5119 Evaluation Board (Rev. B) Apr. 24, 2013
User guide AN-2103 LM5117 Evaluation Board (Rev. B) Apr. 24, 2013

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 LM25117 evaluation board provides the design engineer with a fully functional synchronous buck converter based on Emulated Current Mode Control to evaluate the LM25117 controller IC. The evaluation board provides 3.3V output with a 9A current capability in addition with average output current (...)

Design tools & simulation

SIMULATION MODEL Download
SNVM385.ZIP (51 KB) - PSpice Model
SIMULATION MODEL Download
SNVM386A.ZIP (167 KB) - PSpice Model
SIMULATION MODEL Download
SNVM488A.TSC (148 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVM489A.ZIP (8 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVM490.TSC (196 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVM491.TSC (226 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVM492.ZIP (19 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVM860.ZIP (6 KB) - PSpice Model
SIMULATION MODEL Download
SNVM864.ZIP (2 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
LM(2)5117 Quick Start Calculator
LM25117-5117QUICK-CALC

Reference designs

REFERENCE DESIGNS Download
Power Reduction Using Dynamic Switching Reference Design
TIDA-00675 This design shows the power reduction benefits of dynamically switching a load on/off using a load switch. The design guide shows how frequency of switching, duty cycle, and the use of a discharge resistor can have an impact on power consumption.
document-generic Schematic
REFERENCE DESIGNS Download
Automotive USB Charger with Linear Droop Compensation Reference Design
TIDA-00160 The TIDA-00160 reference design provides detailed data for evaluating and verifying a USB charger, which uses a USB charge controller, a buck controller and a shunt amplifier.

This design demonstrates an automotive USB charging port that offers short-to-battery protection. With the help of the shunt (...)

document-generic Schematic
REFERENCE DESIGNS Download
Automotive USB Charger
PMP6934 — This is a synchronous buck running off automotive 12 volts which supplies 5 volts at 5 amps. The 5 volts is then passed through two TPS2543 charging port power switches.
Design files
REFERENCE DESIGNS Download
8V-40V Input 5V/10A Synchronous Buck for Automotive Applications
PMP7872 — PMP7872 is a synchronous buck converter capable of 50W output power. This design uses the LM25117QPSQ emulated current-mode synchronous buck controller and AUIRLR2905Z MOSFETs for automotive applications.

CAD/CAE symbols

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

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