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LM5123-Q1

ACTIVE

2.2MHz wide VIN low IQ synchronous boost controller

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Data sheet

LM5123-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Boost Vin (max) (V) 42 Vin (min) (V) 0.8 Control mode current mode Vout (max) (V) 57 Vout (min) (V) 5 Features Adjustable current limit, Bypass Mode, Enable, Frequency synchronization, Improved max. duty cycle, Light Load Efficiency, Power good, Spread Spectrum, Synchronization, Synchronous Rectification, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 11 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable EMI features Frequency Dithering, Spread Spectrum
Rating Automotive Topology Boost Vin (max) (V) 42 Vin (min) (V) 0.8 Control mode current mode Vout (max) (V) 57 Vout (min) (V) 5 Features Adjustable current limit, Bypass Mode, Enable, Frequency synchronization, Improved max. duty cycle, Light Load Efficiency, Power good, Spread Spectrum, Synchronization, Synchronous Rectification, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 11 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable EMI features Frequency Dithering, Spread Spectrum
VQFN (RGR) 20 12.25 mm² 3.5 x 3.5
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • Suited for wide operating range automotive battery powered applications
    • 3.8-V to 42-V input operating range
    • Dynamically programmable VOUT from 5 V to 20 V, or from 15 V to 57 V
    • Minimum boost input 0.8 V when BIAS ≥ 3.8 V
    • Bypass operation when VSUPPLY > VLOAD
  • Minimized battery drain
    • Shutdown current ≤ 3 µA
    • Automatic mode transition
    • Battery drain in deep sleep ≤ 11 µA (bypass operation, charge pump off)
    • Battery drain in deep sleep ≤ 38 µA (bypass operation, charge pump on)
    • BIAS IQ in sleep ≤ 13 µA (skip mode)
    • Strong 5-V MOSFET drivers
  • Small solution size and low cost
    • Maximum switching frequency 2.2 MHz
    • Internal boot diode
    • Constant peak current limit over VIN
    • Supports DCR inductor current sensing
    • QFN-20 with wettable flanks
  • Avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Switching frequency from 100 kHz to 2.2 MHz
    • Selectable switching mode (FPWM, diode emulation, skip mode)
  • EMI mitigation
    • Optional programmable spread spectrum
    • Lead-less package
  • Programmability and flexibility
    • Dynamic VOUT tracking
    • Dynamic switching frequency programming
    • Programmable line UVLO
    • Adjustable soft start
    • Adaptive dead-time
    • PGOOD indicator
  • Integrated protection features
    • Cycle-by-cycle peak current limit
    • Overvoltage protection
    • HB-SW short protection
    • Thermal shutdown
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • Suited for wide operating range automotive battery powered applications
    • 3.8-V to 42-V input operating range
    • Dynamically programmable VOUT from 5 V to 20 V, or from 15 V to 57 V
    • Minimum boost input 0.8 V when BIAS ≥ 3.8 V
    • Bypass operation when VSUPPLY > VLOAD
  • Minimized battery drain
    • Shutdown current ≤ 3 µA
    • Automatic mode transition
    • Battery drain in deep sleep ≤ 11 µA (bypass operation, charge pump off)
    • Battery drain in deep sleep ≤ 38 µA (bypass operation, charge pump on)
    • BIAS IQ in sleep ≤ 13 µA (skip mode)
    • Strong 5-V MOSFET drivers
  • Small solution size and low cost
    • Maximum switching frequency 2.2 MHz
    • Internal boot diode
    • Constant peak current limit over VIN
    • Supports DCR inductor current sensing
    • QFN-20 with wettable flanks
  • Avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Switching frequency from 100 kHz to 2.2 MHz
    • Selectable switching mode (FPWM, diode emulation, skip mode)
  • EMI mitigation
    • Optional programmable spread spectrum
    • Lead-less package
  • Programmability and flexibility
    • Dynamic VOUT tracking
    • Dynamic switching frequency programming
    • Programmable line UVLO
    • Adjustable soft start
    • Adaptive dead-time
    • PGOOD indicator
  • Integrated protection features
    • Cycle-by-cycle peak current limit
    • Overvoltage protection
    • HB-SW short protection
    • Thermal shutdown

The LM5123-Q1 device is a wide input range synchronous boost controller that employs peak current mode control.

The LM5123-Q1 device is a wide input range synchronous boost controller that employs peak current mode control.

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Technical documentation

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Type Title Date
* Data sheet LM5123-Q1 2.2-MHz Wide VIN Low-IQ Synchronous Boost Controller with VOUT Tracking datasheet (Rev. B) PDF | HTML 24 Jan 2022
Application note LM5123을 사용하여 부스트 컨버터를 설계하는 방법 PDF | HTML 19 Sep 2023
White paper 克服低功耗應用中的低 IQ 挑戰 (Rev. B) PDF | HTML 19 Apr 2023
White paper 저전력 애플리케이션의 저 IQ 문제점 극복 (Rev. B) PDF | HTML 19 Apr 2023
White paper Overcoming Low-IQ Challenges in Low-Power Applications (Rev. B) PDF | HTML 12 Apr 2023
Application note How to Design a Boost Converter Using LM5123 PDF | HTML 26 Oct 2022
Technical article Creating an immersive automotive audio experience with higher output power and Cla PDF | HTML 22 Feb 2022
User guide LM5123EVM-BST Evaluation Module (Rev. A) PDF | HTML 06 Dec 2021
Functional safety information LM5123-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 30 Nov 2021

Design & development

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

Evaluation board

LM5123EVM-BST — LM5123 boost controller evaluation module

The LM5123EVM-BST evaluation module showcases the features and performance of the LM5123-Q1 wide input voltage synchronous boost controller. The standard configuration is designed to provide a regulated output of 24 V at 100 W, from an input voltage of 9 V to 18 V and switching at 440 kHz. The (...)

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

LM5123-Q1 PSpice Average Model

SLVMDI5.ZIP (43 KB) - PSpice Model
Download
Simulation model

LM5123-Q1 PSpice Transient Model (Rev. B)

SLVMDI1B.ZIP (106 KB) - PSpice Model
Download
Calculation tool

LM5123-Q1-DESIGNCALC — LM5123-Q1 quickstart calculator

Welcome to the quickstart design tool for LM5123-Q1. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC boost converter based on the above controller. This tool will help the user expeditiously arrive at an optimized design to meet the application (...)
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Calculation tool

SLVRBJ1 — LM5123-Q1 Boost Controller Quickstart Design Tool

Welcome to the quickstart design tool for LM5123-Q1. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC boost converter based on the above controller. This tool will help the user expeditiously arrive at an optimized design to meet the application (...)

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM5123-Q1 — 2.2MHz wide VIN low IQ synchronous boost controller
Hardware development
Evaluation board
LM5123EVM-BST — LM5123 boost controller evaluation module
Download
Design tool

TIDA-020033-TD-DESIGN — TIDA-020033 test documentation

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM5123-Q1 — 2.2MHz wide VIN low IQ synchronous boost controller LM51231-Q1 — 2.2-MHz wide-VIN, synchronous boost controller with output voltage tracking
Analog current-sense amplifiers
INA302-Q1 — AEC-Q100, 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amp w/ dual comparators
Speaker amps
TAS6584-Q1 — Automotive 45-V, 10-A digital input, four-channel Class-D audio amplifier with current sense
Ideal diode/ORing controllers
LM7481-Q1 — Automotive ideal diode controller with active rectification driving B2B NFETs
Request
Reference designs

TIDA-020033 — Automotive Class-H audio and tracking power supply reference design

This reference design demonstrates a Class-H audio and tracking power supply audio subsystem. The TAS6584-Q1 audio amplifier tracks the envelope of the digital audio input and adjusts the LM5123-Q1 boost output voltage to meet the power efficiency requirements without the need for an external (...)
Design guide: PDF
Package Pins CAD symbols, footprints & 3D models
VQFN (RGR) 20 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

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