LM25119Q

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Automotive grade 4.5-42V wide VIN, current mode dual synchronous buck controller

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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 0.8 Vout (Max) (V) 41.3 Iout (Max) (A) 40 Iq (Typ) (mA) 6 Iq (Typ) (uA) 6000 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 750 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 125 Regulated outputs (#) 2 Number of Phases 2 Rating Automotive open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

WQFN (RTV) 32 25 mm² 5 x 5 open-in-new Find other Buck controllers (external switch)

Features

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 1C
    • Device CDM ESD Classification Level C4A
  • Emulated Peak Current Mode Control
  • Wide Operating Range (4.5 V to 42 V)
  • Easily Configurable for Dual Outputs or Interleaved Single Output
  • Robust 3.3-A Peak Gate Drive
  • Switching Frequency Programmable to 750 kHz
  • Optional Diode Emulation Mode
  • Programmable Output From 0.8 V
  • Precision 1.5% Voltage Reference
  • Programmable Current Limit
  • Hiccup Mode Overload Protection
  • Programmable Soft-Start
  • Programmable Line Undervoltage Lockout
  • Automatic Switchover to External Bias Supply
  • Channel2 Enable Logic Input
  • Thermal Shutdown
  • Leadless 32-Pin WQFN Package

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Description

The LM25119Q device is a dual 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 using an emulated current ramp. Current mode control provides inherent line feedforward, 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 switching frequency is programmable from 50 kHz to 750 kHz. The LM25119Q device drives external high-side and low-side N-channel MOS 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 with automatic switch-over to external bias further improves efficiency. Additional features include thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit and adjustable line undervoltage lockout. The device is available in a power enhanced leadless 32-pin WQFN package featuring an exposed die attach pad to aid thermal dissipation.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LM25119Q Wide Input Range, Dual Synchronous Buck Controller datasheet Jan. 29, 2018
White papers Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) Jul. 03, 2018
More literature LM5119 and LM25119 Design tool Feb. 26, 2014

Design & development

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

Design tools & simulation

SIMULATION MODELS Download
SNVM384.ZIP (227 KB) - PSpice Model
SIMULATION MODELS Download
SNVM482.ZIP (26 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SNVM483.TSC (224 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVM484.TSC (154 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVM865.ZIP (4 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
LM(2)5119 Quick Start Calculator
LM25119-5119QUICK-CALC

Reference designs

REFERENCE DESIGNS Download
Quarter Brick Dual Phase Synchronous Buck Converter Automotive Reference Design
PMP20659 — PMP20659 is a dual-phase synchronous buck converter reference design utilizing the LM25119-Q1 dual synchronous buck controller I.C. The design accepts an input voltage of 4.5V to 40V and provides a 5V output capable of supplying 45A of current to the load. This represents a power density design of (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
WQFN (RTV) 32 View options

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