LMQ61460

• Functional Safety-Capable
  • Documentation available to aid functional safety system design
• Optimized for ultra-low EMI requirements
  • Hotrod™ package minimizes switch node ringing
  • Internal bypass capacitors reduce EMI
  • Parallel input path minimizes parasitic inductance
  • Spread spectrum reduces peak emissions
  • Adjustable switch node rise time
• Designed for rugged applications
  • Supports 42-V transient
  • 0.4-V dropout with 4-A load (typical)
• High efficiency power conversion at all loads
  • 7-µA no load current at 13.5 V_IN, 3.3 V_OUT
  • 90% PFM efficiency at 1-mA, 13.5 V_IN, 5 V_OUT
  • Low MOSFET ON resistance
    • R_{DS_ON_HS} = 41 mΩ (typical)
    • R_{DS_ON_LS} = 21 mΩ (typical)
• External bias option for improved efficiency
• Pin compatible with:
  • LM61460 (36 V, 6 A)

The LMQ61460 is a high-performance, DC-DC synchronous buck converter with integrated bypass capacitors. With integrated high-side and low-side MOSFETs, up to 6 A of output current is delivered over a wide input range of 3.0 V to 36 V; tolerant of 42 V, easing input surge protection design. The device implements soft recovery from dropout eliminating overshoot on the output.

The device is specifically designed for minimal EMI. The device incorporates pseudo-random spread spectrum, integrated bypass capacitors, adjustable SW node rise time, low-EMI VQFN-HR package featuring low switch node ringing, and optimized pinout for ease of use. The switching frequency can be synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. In addition the frequency can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency.

Auto-mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of only 7 µA (typical) and high light load efficiency. Seamless transition between PWM and PFM modes, along with very low MOSFET ON resistances and an external bias input, ensures exceptional efficiency across the entire load range.