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LM5157-Q1

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6-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum

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Product details

Parameters

Vin (Min) (V) 1.5 Vin (Max) (V) 45 Vout (Min) (V) 1.5 Vout (Max) (V) 48 Switch current limit (Typ) (A) 7.5 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 2200 Iq (Typ) (mA) 0.67 Features Enable, Frequency Synchronization, Power Good, Spread Spectrum, UVLO Adjustable Duty cycle (Max) (%) 93 Operating temperature range (C) -40 to 150 Rating Automotive open-in-new Find other Boost converters (integrated switch)

Package | Pins | Size

WQFN (RTE) 16 9 mm² 3 x 3 open-in-new Find other Boost converters (integrated switch)

Features

  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C TA
  • Functional Safety-Capable
  • Suited for wide operating range for car battery applications
    • 2.9-V to 45-V input operating range
    • 48-V maximum output (50-V abs max)
    • Minimum boost supply voltage of 1.5 V when BIAS ≥ 2.9 V
    • Input transient protection up to 50 V
    • Minimized battery drain
      • Low shutdown current (IQ ≤ 2.6 µA)
      • Low operating current (IQ ≤ 700 µA)
  • Small solution size and low cost
    • Maximum switching frequency up to 2.2 MHz
    • 16-pin QFN package (3 mm × 3 mm) with wettable flanks
    • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
    • Minimized undershoot during cranking (start-stop application)
    • Accurate current limit (see the Device Comparison Table)
  • EMI mitigation
    • Selectable dual random spread spectrum
    • Lead-less package
  • Higher efficiency with low-power dissipation
    • 45-mΩ RDSON switch
    • Fast switching, small switching loss
  • Avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Dynamically programmable wide switching frequency from 100 kHz to 2.2 MHz
  • Integrated protection features
    • Constant current limiting over input voltage
    • Selectable hiccup mode overload protection
    • Programmable line UVLO
    • OVP protection
    • Thermal shutdown
  • Accurate ±1% accuracy feedback reference
  • Adjustable soft start
  • PGOOD indicator
  • Create a custom design using the LM5157x-Q1 with the WEBENCH Power Designer
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Description

The LM5157x-Q1 device is a wide input range, non-synchronous boost converter with integrated 50-V, 6.5-A (LM5157-Q1) or 50-V, 4.33-A (LM51571-Q1) power switch.

The device can be used in boost, SEPIC, and flyback topologies. The device can start up from a single-cell battery with a minimum of 2.9 V. It can operate with the input supply voltage as low as 1.5 V if the BIAS pin is greater than 2.9 V.

open-in-new Find other Boost converters (integrated switch)
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Technical documentation

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Type Title Date
* Data sheet LM5157x-Q1 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spectrum datasheet (Rev. A) Mar. 02, 2021
User guide LM5157-Q1 Flyback Converter Evaluation Module May 04, 2021
Technical article Lowering audible noise in automotive applications with TI’s DRSS technology Mar. 18, 2021
Functional safety information LM5157x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution Mar. 01, 2021
White paper 透過節省時間和成本的創新技術 降低電源中的EMI Dec. 04, 2020
White paper 전원 공급 장치의 EMI 절감을 위한 시간 및 비용 효율적 혁신 Dec. 04, 2020
White paper Time-Saving and Cost-Effective Innovations for EMI Reduction Nov. 11, 2020
User guide LM5157Q1EVM-BST User's Guide Oct. 16, 2020
Application note EMI Reduction Technique, Dual Random Spread Spectrum Jun. 19, 2020

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description
The LM5157EVM-BST evaluation module showcases the features and performance of the LM5157 device as wide input voltage, boost converter with dual random spread spectrum. The standard configuration is designed to provide a regulated output of 12V at 1.6A from an input of 3V to 9V (load derated by half (...)
Features
  • Input voltage range: 3V to 9V
  • Isolated output voltage 12V at 1.6A (load derated by half from < 6V input)
  • Switching frequency 2.1MHz
  • Dual random spread spectrum

Design tools & simulation

SIMULATION MODEL Download
SNVMC63.ZIP (53 KB) - PSpice Model
SIMULATION MODEL Download
SNVMC64.ZIP (193 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
  • (...)

CAD/CAE symbols

Package Pins Download
WQFN (RTE) 16 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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