Product details

Vin (Min) (V) 0.8 Vin (Max) (V) 42 Vout (Min) (V) 5 Vout (Max) (V) 57 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 2200 Iq (Typ) (mA) 1.2 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 Duty cycle (Max) (%) 93 Rating Automotive Operating temperature range (C) -40 to 150
Vin (Min) (V) 0.8 Vin (Max) (V) 42 Vout (Min) (V) 5 Vout (Max) (V) 57 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 2200 Iq (Typ) (mA) 1.2 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 Duty cycle (Max) (%) 93 Rating Automotive Operating temperature range (C) -40 to 150
VQFN (RGR) 20 12 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
    • Programable 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
    • Programable 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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LM5121-Q1 ACTIVE Automotive, 3-65-V wide VIN, current mode synchronous boost with disconnection switch control Use LM5121-Q1 if input disconnect function is required
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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. A) 08 Dec 2021
User guide LM5123EVM-BST Evaluation Module (Rev. A) 06 Dec 2021
Functional safety information LM5123-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA 30 Nov 2021
White paper 克服低功耗應用中的低 IQ 挑戰 (Rev. A) 29 Oct 2021
White paper 저전력 애플리케이션의 저 IQ 문제점극복 (Rev. A) 29 Oct 2021
White paper Overcoming Low-IQ Challenges in Low-Power Applications (Rev. A) 15 Sep 2021
Technical article How to add overvoltage protection to a synchronous boost controller 17 Sep 2018

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 (...)

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Simulation model

LM5123-Q1 PSpice Transient Model

SLVMDI1.ZIP (102 KB) - PSpice Model
Simulation model

LM5123-Q1 PSpice Average Model

SLVMDI5.ZIP (43 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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 (...)
Calculation tool

LM5123-Q1 Boost Controller Quickstart Design Tool

SLVRBJ1.ZIP (3901 KB)
Package Pins Download
VQFN (RGR) 20 View options

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