LM51571QRTERQ1
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Texas Instruments LM51571QRTERQ1

Manufacturer No:
LM51571QRTERQ1
Manufacturer:
Texas Instruments
Package:
Tape & Reel (TR)
Description:
4-A, 50-V, 2.2-MHZ WIDE VIN BOOS
Delivery:
Payment:
iso14001
iso45001
iso9001
iso13485

Product Introduction

Overview

The LM51571QRTERQ1 is a wide input range, non-synchronous boost converter manufactured by Texas Instruments. It is part of the AEC-Q100 qualified series, making it suitable for automotive applications with a temperature range of –40°C to +125°C. This device integrates a 50-V, 4.33-A power switch and can operate in boost, SEPIC, and flyback topologies. It can start up from a single-cell battery with a minimum of 2.9 V and can operate with input supply voltages as low as 1.5 V if the BIAS pin is greater than 2.9 V. The device features a small solution size, low cost, and high efficiency with low-power dissipation.

Key Specifications

ParameterMinimumTypicalMaximumUnit
Input Voltage Range2.9-45V
Maximum Output Voltage--48 (50 abs max)V
Switch Current Limit4.33-5.67A
Switching Frequency100 kHz-2.2 MHz-
Shutdown Current (IQ)--2.6 µA-
Operating Current (IQ)--700 µA-
Package Type--16-pin QFN (3 mm × 3 mm)-
Internal MOSFET On-Resistance (RDSON)45-90mΩ
Thermal Shutdown Threshold--175°C-

Key Features

  • Wide input range: 2.9 V to 45 V, with minimum boost supply voltage of 1.5 V when BIAS ≥ 2.9 V.
  • Integrated 50-V, 4.33-A power switch.
  • Dynamically programmable switching frequency from 100 kHz to 2.2 MHz.
  • Selectable dual random spread spectrum for EMI mitigation.
  • Low shutdown current (IQ ≤ 2.6 µA) and low operating current (IQ ≤ 700 µA).
  • Integrated error amplifier allows primary-side regulation without optocoupler (flyback).
  • Accurate current limit and pulse-skipping operation for improved efficiency at light loads.
  • Built-in protection features: overvoltage protection, line UVLO, thermal shutdown, and selectable hiccup mode overload protection.
  • Programmable soft start, precision reference, and power-good indicator.
  • External clock synchronization.
  • Small solution size and low cost.

Applications

  • Battery-powered wide input boost, SEPIC, and flyback converters.
  • Automotive voltage stabilizer in SEPIC topology.
  • Automotive start-stop applications.
  • Automotive emergency call and backup battery booster applications.
  • High voltage LiDAR power supply.
  • Automotive LED bias supply.
  • Multiple-output flyback without optocoupler.
  • Holdup capacitor charger.
  • Audio amplifier power supply.
  • Piezo driver/motor driver bias supply.

Q & A

  1. What is the input voltage range of the LM51571QRTERQ1?
    The input voltage range is from 2.9 V to 45 V.
  2. What is the maximum output voltage of the LM51571QRTERQ1?
    The maximum output voltage is 48 V (50 V absolute maximum).
  3. What is the current limit of the integrated power switch?
    The current limit is 4.33 A.
  4. What are the switching frequency options for the LM51571QRTERQ1?
    The switching frequency can be dynamically programmed from 100 kHz to 2.2 MHz.
  5. What is the shutdown current (IQ) of the device?
    The shutdown current (IQ) is less than or equal to 2.6 µA.
  6. What package type is the LM51571QRTERQ1 available in?
    The device is available in a 16-pin QFN package (3 mm × 3 mm).
  7. Does the LM51571QRTERQ1 have built-in protection features?
    Yes, it includes overvoltage protection, line UVLO, thermal shutdown, and selectable hiccup mode overload protection.
  8. Can the LM51571QRTERQ1 be used in various topologies?
    Yes, it can be used in boost, SEPIC, and flyback topologies.
  9. How does the device mitigate EMI?
    The device provides a selectable dual random spread spectrum to reduce EMI over a wide frequency range.
  10. Is the LM51571QRTERQ1 suitable for automotive applications?
    Yes, it is AEC-Q100 qualified for automotive applications.

Product Attributes

Function:Step-Up, Step-Up/Step-Down
Output Configuration:Positive
Topology:Boost, Flyback, SEPIC
Output Type:Adjustable
Number of Outputs:1
Voltage - Input (Min):1.5V
Voltage - Input (Max):45V
Voltage - Output (Min/Fixed):1.5V
Voltage - Output (Max):48V
Current - Output:4.33A
Frequency - Switching:100kHz ~ 2.2MHz
Synchronous Rectifier:No
Operating Temperature:-40°C ~ 150°C (TJ)
Mounting Type:Surface Mount
Package / Case:16-WFQFN Exposed Pad
Supplier Device Package:16-WQFN (3x3)
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Similar Products

Part Number LM51571QRTERQ1 LM51581QRTERQ1 LM5157QRTERQ1
Manufacturer Texas Instruments Texas Instruments Texas Instruments
Product Status Active Active Active
Function Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down
Output Configuration Positive Positive Positive
Topology Boost, Flyback, SEPIC Boost, Flyback, SEPIC Boost, Flyback, SEPIC
Output Type Adjustable Adjustable Adjustable
Number of Outputs 1 1 1
Voltage - Input (Min) 1.5V 1.5V 1.5V
Voltage - Input (Max) 45V 60V 45V
Voltage - Output (Min/Fixed) 1.5V 1.5V 1.5V
Voltage - Output (Max) 48V 83V 48V
Current - Output 4.33A 1.63A (Switch) 6.5A (Switch)
Frequency - Switching 100kHz ~ 2.2MHz 100kHz ~ 2.2MHz 100kHz ~ 2.2MHz
Synchronous Rectifier No No Yes
Operating Temperature -40°C ~ 150°C (TJ) -40°C ~ 125°C (TA) -40°C ~ 150°C (TJ)
Mounting Type Surface Mount Surface Mount Surface Mount
Package / Case 16-WFQFN Exposed Pad 16-WFQFN Exposed Pad 16-WFQFN Exposed Pad
Supplier Device Package 16-WQFN (3x3) 16-WQFN (3x3) 16-WQFN (3x3)

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