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LM51231-Q1

AKTIV

Synchroner Laderegler, großer VIN-Bereich, 2,2 MHz, mit Ausgangsspannungsverfolgung

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LM51231-Q1

AKTIV
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Produktdetails

Topology Boost 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) 0.011 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 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (°C) -40 to 125 Type Controller
Topology Boost 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) 0.011 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 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (°C) -40 to 125 Type Controller
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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Technische Dokumentation

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Typ Titel Datum
* 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
Technischer Artikel How to add overvoltage protection to a synchronous boost controller 17 Sep 2018

Design und Entwicklung

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Evaluierungsplatine

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