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LM5157

ACTIVE

6A/4A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum

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Data sheet

LM5157

ACTIVE
Data sheet Order now

Product details

Iout (max) (A) 7.5 Vin (min) (V) 1.5 Vin (max) (V) 45 Topology Boost, Flyback, SEPIC Type Converter Switching frequency (min) (kHz) 100 Switching frequency (max) (kHz) 2200 Features Enable, Frequency synchronization, Nonsynchronous rectification, Power good, Spread Spectrum, UVLO adjustable Control mode current mode Vout (min) (V) 1.5 Vout (max) (V) 48 Rating Catalog Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.00067
Iout (max) (A) 7.5 Vin (min) (V) 1.5 Vin (max) (V) 45 Topology Boost, Flyback, SEPIC Type Converter Switching frequency (min) (kHz) 100 Switching frequency (max) (kHz) 2200 Features Enable, Frequency synchronization, Nonsynchronous rectification, Power good, Spread Spectrum, UVLO adjustable Control mode current mode Vout (min) (V) 1.5 Vout (max) (V) 48 Rating Catalog Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.00067
WQFN (RTE) 16 9 mm² 3 x 3
  • Suited for wide operating range for 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 (I Q ≤ 2.6 µA)
      • Low operating current (I Q ≤ 670 µA)
  • Small solution size and low cost
    • Maximum switching frequency up to 2.2 MHz
    • 16-pin QFN package (3 mm × 3 mm)
    • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
    • 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 R DSON 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 with the WEBENCH Power Designer
  • Suited for wide operating range for 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 (I Q ≤ 2.6 µA)
      • Low operating current (I Q ≤ 670 µA)
  • Small solution size and low cost
    • Maximum switching frequency up to 2.2 MHz
    • 16-pin QFN package (3 mm × 3 mm)
    • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
    • 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 R DSON 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 with the WEBENCH Power Designer

The LM5157 device is a wide input range, non-synchronous boost converter with integrated 50-V 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 an input supply voltage as low as 1.5 V if the BIAS pin is greater than 2.9 V.

The BIAS pin operates up to 45 V (50-V absolute maximum). The switching frequency is dynamically programmable with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows for a small solution size and fast transient response. To reduce the EMI of the power supply, the device provides a selectable Dual Random Spread Spectrum, which reduces the EMI over a wide frequency range.

The device features an accurate peak current limit over the input voltage, which avoids overdesigning power inductor. Low operating current and pulse-skipping operation improve efficiency at light loads.

The device has built-in protection features such as overvoltage protection, line UVLO, thermal shutdown, and selectable Hiccup mode overload protection. Additional features include low shutdown I Q, programmable soft start, precision reference, a power-good indicator, and external clock synchronization.

The LM5157 device is a wide input range, non-synchronous boost converter with integrated 50-V 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 an input supply voltage as low as 1.5 V if the BIAS pin is greater than 2.9 V.

The BIAS pin operates up to 45 V (50-V absolute maximum). The switching frequency is dynamically programmable with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows for a small solution size and fast transient response. To reduce the EMI of the power supply, the device provides a selectable Dual Random Spread Spectrum, which reduces the EMI over a wide frequency range.

The device features an accurate peak current limit over the input voltage, which avoids overdesigning power inductor. Low operating current and pulse-skipping operation improve efficiency at light loads.

The device has built-in protection features such as overvoltage protection, line UVLO, thermal shutdown, and selectable Hiccup mode overload protection. Additional features include low shutdown I Q, programmable soft start, precision reference, a power-good indicator, and external clock synchronization.
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LM5157-Q1 ACTIVE 6-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum Automotive grade version
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LM5158 ACTIVE 3-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum Device with higher Vin, Vout capability

Technical documentation

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Type Title Date
* Data sheet LM5157 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spectrum datasheet (Rev. A) PDF | HTML 03 May 2023
Application note How to Implement the Soft Start in a Flyback PDF | HTML 10 Jul 2023
Application note How to Design an Isolated Flyback Converter Using LM5157x/LM5158x (Rev. A) PDF | HTML 16 Mar 2023
Application note Basic Calculation of a Coupled Inductor SEPIC Power Stage PDF | HTML 13 Mar 2023
Application note LM5157x, LM5158x를 사용하여 부스트 컨버터를 설계하는 방법 PDF | HTML 28 Oct 2022
User guide LM5157 SEPIC Evaluation Module PDF | HTML 07 Mar 2022
Certificate LM5157EVM-SEPIC EU RoHS Declaration of Conformity (DoC) 23 Dec 2021
Application note How to Design a Boost Converter Using LM5157x, LM5158x PDF | HTML 11 Nov 2021
EVM User's guide LM5157-Q1 Flyback Converter Evaluation Module PDF | HTML 04 May 2021
Technical article Lowering audible noise in automotive applications with TI’s DRSS technology PDF | HTML 18 Mar 2021

Design & development

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

Evaluation board

LM5157EVM-BST — LM5157 boost converter evaluation module

The LM5157EVM-BST evaluation module showcases the features and performance of the LM5157 device as a wide input voltage boost converter with dual random spread spectrum. The standard configuration is designed to provide a regulated output of 12 V at 1.6 A from an input of 3 V to (...)
User guide: PDF | HTML
Not available on TI.com
Evaluation board

LM5157EVM-FLY — LM5157 flyback boost converter evaluation module

The LM5157EVM-FLY evaluation module showcases the features and performance of the LM5157 as a flyback converter to produce multiple output voltage rails for typical applications of the 3phase inverter gate driver bias supplies.  The standard configuration is designed to provide a regulated (...)
User guide: PDF | HTML
Not available on TI.com
Evaluation board

LM5157EVM-SEPIC — LM5157 evaluation module for SEPIC

The LM5157EVM-SEPIC evaluation module showcases the features and performance of the LM5157 as wide input non-synchronous SEPIC converter. The standard configuration is designed to provide a regulated output of 12 V at up to 1 A from an input of 4 V to 32 V, switching at 2.1 MHz.

User guide: PDF | HTML
Not available on TI.com
Simulation model

LM5157x-Q1 Encrypted PSpice Transient Model (Rev. B)

SNVMC64B.ZIP (193 KB) - PSpice Model
Download
Simulation model

LM5157x-Q1 PSpice Average Model (Encrypted)

SNVMC63.ZIP (53 KB) - PSpice Model
Download
Calculation tool

SNVR508 — LM515x Quickstart Calculator for Flyback Regulator Design

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LM5157 — 6A/4A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5157-Q1 — 6-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51571-Q1 — 4-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5158 — 3-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5158-Q1 — 3-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51581 — 1.5-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51581-Q1 — 1.5-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum
Hardware development
Evaluation board
LM5158EVM-FLY — LM5158-Q1 flyback converter evaluation module
Download
Calculation tool

SNVR511 — LM5157 and LM5158 Quickstart Calculator for Boost Regulator Design

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LM5157 — 6A/4A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5157-Q1 — 6-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51571-Q1 — 4-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5158 — 3-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5158-Q1 — 3-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51581 — 1.5-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51581-Q1 — 1.5-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum
Download
Calculation tool

SNVR512 — LM5157 and LM5158 Quickstart Calculator for SEPIC Regulator Design

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LM5157 — 6A/4A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5157-Q1 — 6-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51571-Q1 — 4-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5158 — 3-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5158-Q1 — 3-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51581 — 1.5-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51581-Q1 — 1.5-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum
Download
Package Pins Download
WQFN (RTE) 16 View options
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