LMR34206-Q1 4.2-V to 42-V, 0.6-A Ultra-Small Synchronous Step-Down Converter

1 Features

• AEC-Q100-qualified for automotive applications:
  • Temperature grade 1: –40°C to +125°C, T_A
• Designed for automotive applications
  • Junction temperature range –40°C to +150°C
  • Protection features: thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, hiccup short-circuit protection
  • 0.2-V dropout with 0.6-A load (typical)
  • ±1.5% reference voltage tolerance
  • 3.3-V, 5-V fixed-output voltage options
• Suited for scalable power supplies
  • Pin compatible with:
    • LMR36015/06-Q1 (60 V, 0.6 A or 1.5 A)
    • LMR33620/30-Q1 (36 V, 2 A, or 3 A)
  • 2.1-MHz frequency option
• Integration reduces solution size and cost
  • Small, 2-mm × 3-mm VQFN package with wettable flanks
  • Few external components
• Low power dissipation across load spectrum
  • Increased light load efficiency in PFM
  • Low operating quiescent current of 24 µA
• Optimized for ultra low EMI requirements
  • Meets CISPR25 class 5 standard
  • Hotrod™ package minimizes switch node ringing
  • Parallel input path minimizes parasitic inductance
  • Spread spectrum reduces peak emissions

2 Applications

• ADAS camera module
• Head-up display
• Body control module
• General purpose wide V_IN power supplies

3 Description

The LMR34206-Q1 regulator is an easy-to-use, synchronous, step-down DC/DC converter. With integrated high-side and low-side power MOSFETs, up to of output current is delivered over a wide input voltage range of 4.2 V to 42 V.

The LMR34206-Q1 uses peak-current-mode control to provide optimal efficiency and output voltage accuracy. Precision enable gives flexibility by enabling a direct connection to the wide input voltage or precise control over device start-up and shutdown. The power-good flag, with built-in filtering and delay, offers a true indication of system status eliminating the requirement for an external supervisor.

The LMR34206-Q1 is in a HotRod™ package which enables low EMI, higher efficiency, and the smallest package to die ratio. The device requires few external components and has a pinout designed for simple PCB layout. The small solution size and feature set of the LMR34206-Q1 are designed to simplify implementation for a wide range of end equipment.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Device Images

3.1 Simplified Schematic