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LMR34206FSC5RNXRQ1

42V 2A sync buck, 5V fixed, 2.2MHz, 18uA Iq, AEC-Q100, SOT-563

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Manufacturer Part：

LMR34206FSC5RNXRQ1

Package：

SOT-563 (1.6 x 1.2 x 0.55mm)

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Description

Product Overview

The LMR34206FSC5RNXRQ1 from Texas Instruments is an AEC-Q100 qualified 42V, 2A synchronous buck converter with 5V fixed output, 2.2MHz switching frequency, 18uA quiescent current, and integrated high-side and low-side MOSFETs in an SOT-563 package.

Key Specifications

Manufacturer Texas Instruments
Topology Synchronous Buck
Output Voltage 5V (fixed)
Output Current 2A
Input Voltage Range 3.8V to 42V
Switching Frequency 2.2MHz
Quiescent Current 18uA (sleep mode)
Shutdown Current 1.5uA
Qualification AEC-Q100 Grade 1
Package SOT-563 (1.6 x 1.2mm)
Operating Temperature -40C to +150C (TJ)

Features

  • AEC-Q100 Grade 1 qualified for automotive
  • 42V maximum input with load dump protection
  • 2A output with integrated high-side and low-side MOSFETs
  • 5V fixed output voltage
  • 2.2MHz switching frequency for small external components
  • 18uA ultra-low quiescent current
  • 1.5uA shutdown current
  • Spread-spectrum modulation for EMI reduction
  • Cycle-by-cycle current limit
  • Thermal shutdown protection

Applications

  • Automotive infotainment and ADAS power supplies
  • Automotive body electronics
  • Industrial 24V bus systems
  • Battery-powered automotive applications

The Texas Instruments LMR34206FSC5RNXRQ1 is an AEC-Q100 Grade 1 qualified synchronous step-down converter designed for automotive applications. It integrates both high-side and low-side MOSFETs for high-efficiency synchronous rectification, delivering 2A output current from a 3.8V to 42V input range with fixed 5V output. The 2.2MHz switching frequency minimizes the size of external inductor and capacitors. The 18uA quiescent current in sleep mode preserves battery life in always-on automotive systems. The device features spread-spectrum modulation for reduced EMI, cycle-by-cycle current limiting, and thermal shutdown. The ultra-small SOT-563 package (1.6 x 1.2mm) enables compact power supply designs in space-constrained automotive modules.

The LMR34206FSC5RNXRQ1 operates as a synchronous buck converter with four key subsystems: 1) Synchronous Power Stage: The integrated high-side P-channel MOSFET and low-side N-channel MOSFET provide efficient power conversion. During on-time, the high-side switch conducts, storing energy in the inductor. During off-time, the low-side switch provides a low-resistance path for inductor current (synchronous rectification), eliminating diode conduction losses. 2) Control: Peak current-mode control with internal compensation maintains 5V output regulation. The 2.2MHz fixed frequency allows very small inductor values (1.5uH typical). 3) Spread Spectrum: A +-6% frequency dithering modulates the switching frequency, spreading EMI energy across a wider band to ease compliance with automotive EMC standards. 4) Protection: UVLO, thermal shutdown at 170C, and cycle-by-cycle current limiting provide comprehensive fault protection for automotive environments.

Pin Name Type Function
1 GND Ground Ground
2 VIN Power Input supply (3.8V to 42V)
3 EN Input Enable (active high)
4 FB Input Feedback (connect to output for 5V fixed)
5 SW Output Switch output (connect to inductor)
6 BOOT Capacitor Bootstrap capacitor for high-side driver
  • 5V supply from 12V car battery in automotive ADAS modules
  • 24V industrial bus to 5V conversion with automotive qualification
  • Battery-powered automotive ECU with 18uA sleep current
Manufacturer Part Number Package Notes
TI LMR34206FAE5RNQ1 SOT-563 3.3V output version
TI LM61460AASQRJRRQ1 VQFN-HR-12 36V, 6A automotive buck
Infineon TLE6368G2 PG-DSO-14 45V, 2A automotive buck
ROHM BD9S302MUF-CETL2 QFN-16 45V, 3A automotive buck
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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