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LM51231-Q1

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2.2-MHz wide-VIN, synchronous boost controller with output voltage tracking

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Data sheet

LM51231-Q1

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 0.8 Vin (max) (V) 42 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Boost Rating Automotive Vout (min) (V) 5 Vout (max) (V) 57 Features Adjustable current limit, Bypass Mode, Dynamic Voltage Scaling, Enable, Frequency synchronization, Hiccup mode protection, Improved max. duty cycle, Light Load Efficiency, Power good, Spread Spectrum, Synchronization, Synchronous Rectification, Tracking, UVLO adjustable Iq (typ) (µA) 11 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable
Vin (min) (V) 0.8 Vin (max) (V) 42 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Boost Rating Automotive Vout (min) (V) 5 Vout (max) (V) 57 Features Adjustable current limit, Bypass Mode, Dynamic Voltage Scaling, Enable, Frequency synchronization, Hiccup mode protection, Improved max. duty cycle, Light Load Efficiency, Power good, Spread Spectrum, Synchronization, Synchronous Rectification, Tracking, UVLO adjustable Iq (typ) (µA) 11 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable
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
  • BIAS shutdown current ≤ 3 µA
  • Small solution size
    • Maximum switching frequency 2.2 MHz
    • Internal boot diode
    • QFN-20 with wettable flanks
  • EMI mitigation and avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Switching frequency from 100 kHz to 2.2 MHz
    • Selectable switching mode (FPWM, diode emulation)
    • Optional programmable spread spectrum
    • Lead-less package
  • Programmability and flexibility
    • Dynamic VOUT tracking
    • Dynamic switching frequency programming
    • Supports DCR inductor current sensing
    • Programmable input voltage UVLO
    • Adjustable soft start
    • Adaptive dead-time
    • PGOOD indicator
  • Integrated protection features
    • Constant cycle-by-cycle peak current limit over VSUPPLY
    • 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
  • BIAS shutdown current ≤ 3 µA
  • Small solution size
    • Maximum switching frequency 2.2 MHz
    • Internal boot diode
    • QFN-20 with wettable flanks
  • EMI mitigation and avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Switching frequency from 100 kHz to 2.2 MHz
    • Selectable switching mode (FPWM, diode emulation)
    • Optional programmable spread spectrum
    • Lead-less package
  • Programmability and flexibility
    • Dynamic VOUT tracking
    • Dynamic switching frequency programming
    • Supports DCR inductor current sensing
    • Programmable input voltage UVLO
    • Adjustable soft start
    • Adaptive dead-time
    • PGOOD indicator
  • Integrated protection features
    • Constant cycle-by-cycle peak current limit over VSUPPLY
    • Overvoltage protection
    • HB-SW short protection
    • Thermal shutdown

The LM51231-Q1 device is a wide input range synchronous boost controller that employs peak current mode control. The device’s wide input range supports automotive cold-crank and load dump. The minimum input voltage can be as low as 0.8 V when BIAS is equal to or greater than 3.8 V. The output voltage can be dynamically programmed by using the tracking function. Bypass mode operation is automatically entered when VSUPPLY > VLOAD, eliminating the body diode drop of the high-side MOSFET. The switching frequency is dynamically programmed with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows a small solution size and fast transient response.

The device has built-in protection features such as peak current limit, which is constant over VSUPPLY, overvoltage protection, and thermal shutdown. External clock synchronization, programmable spread spectrum modulation, and a lead-less package with minimal parasitic, help to reduce EMI and avoid cross talk. Additional features include line UVLO, FPWM, diode emulation, DCR inductor current sensing, programmable soft start, and a power-good indicator

The LM51231-Q1 device is a wide input range synchronous boost controller that employs peak current mode control. The device’s wide input range supports automotive cold-crank and load dump. The minimum input voltage can be as low as 0.8 V when BIAS is equal to or greater than 3.8 V. The output voltage can be dynamically programmed by using the tracking function. Bypass mode operation is automatically entered when VSUPPLY > VLOAD, eliminating the body diode drop of the high-side MOSFET. The switching frequency is dynamically programmed with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows a small solution size and fast transient response.

The device has built-in protection features such as peak current limit, which is constant over VSUPPLY, overvoltage protection, and thermal shutdown. External clock synchronization, programmable spread spectrum modulation, and a lead-less package with minimal parasitic, help to reduce EMI and avoid cross talk. Additional features include line UVLO, FPWM, diode emulation, DCR inductor current sensing, programmable soft start, and a power-good indicator
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Technical documentation

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Type Title Date
* Data sheet LM51231-Q1 2.2-MHz Wide VIN Synchronous Boost Controller with VOUT Tracking datasheet PDF | HTML 24 Nov 2021
Functional safety information LM51231-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 13 Sep 2022

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

LM51231-Q1 PSpice Average Model

SLVMDY8.ZIP (74 KB) - PSpice Model
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Simulation model

LM51231-Q1 PSpice Transient Model

SLVMDY7.ZIP (139 KB) - PSpice Model
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CAD/CAE symbol

LM5123EVM-BST Altium CAD Files

SNVR528.ZIP (1352 KB)
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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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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
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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
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