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
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
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
    • 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.

Download

Similar products you might be interested in

open-in-new Compare products
Same functionality with different pin-out to the compared device.
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
LM5122-Q1 ACTIVE Automotive, 3-V to 65-V wide VIN, current mode synchronous boost controller with multiphase Use LM5122-Q1 in cases requiring Vin >42V
NEW LM51231-Q1 ACTIVE 2.2-MHz wide-VIN, synchronous boost controller with output voltage tracking

LM51231-Q1 is a spin of the LM5123-Q1 which has negative current limit active in bypass mode

NEW LM5152-Q1 ACTIVE Automotive 2.2 MHz wide VIN low IQ synchronous boost controller

LM5152-Q1 support lower Vout if > 20V is not required 

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 9
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 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 Class-H control 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
White paper 克服低功耗應用中的低 IQ 挑戰 (Rev. A) PDF | HTML 29 Oct 2021
White paper 저전력 애플리케이션의 저 IQ 문제점극복 (Rev. A) PDF | HTML 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 (...)

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

LM5123-Q1 PSpice Average Model

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

LM5123-Q1 PSpice Transient Model (Rev. B)

SLVMDI1B.ZIP (106 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 (...)
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 Download
VQFN (RGR) 20 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos