LM5164-Q1

• AEC-Q100-qualified for automotive applications
  • Device temperature grade 1: –40°C to +125°C, ambient temperature range
• Designed for reliable and rugged applications
  • Wide input voltage range of 6 V to 100 V
  • Junction temperature range: –40°C to +150°C
  • Fixed 3-ms internal soft-start timer
  • Peak and valley current-limit protection
  • Input UVLO and thermal shutdown protection
• Suited for scalable automotive power supplies
  • Low minimum on- and off-times of 50 ns
  • Adjustable switching frequency up to 1 MHz
  • Diode emulation for high light-load efficiency
  • 10.5-µA no-load input quiescent current
  • 3-µA shutdown quiescent current
  • Optimized for CISPR 25 EMI standard
• Integration reduces solution size and cost
  • COT mode control architecture
  • Integrated 0.725-Ω NFET buck switch supports wide duty cycle range
  • Integrated 0.34-Ω NFET synchronous rectifier eliminates external Schottky diode
  • 1.2-V internal voltage reference
  • No loop compensation components
  • Internal VCC bias regulator and boot diode
• Create a custom design using WEBENCH^® power designer

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The LM5164-Q1 synchronous buck converter is designed to regulate over a wide input voltage range, minimizing the need for external surge suppression components. A minimum controllable on-time of 50 ns facilitates large step-down conversion ratios, enabling the direct step-down from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5164-Q1 operates during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance 48-V battery automotive applications and MHEV/EV systems.

With integrated high-side and low-side power MOSFETs, the LM5164-Q1 delivers up to 1-A of output current. A constant on-time (COT) control architecture provides nearly constant switching frequency with excellent load and line transient response. Additional features of the LM5164-Q1 include ultra-low I_Q and diode emulation mode operation for high light-load efficiency, innovative peak and valley overcurrent protection, integrated VCC bias supply and bootstrap diode, precision enable and input UVLO, and thermal shutdown protection with automatic recovery. An open-drain PGOOD indicator provides sequencing, fault reporting, and output voltage monitoring.

The LM5164-Q1 is qualified to automotive AEC-Q100 grade 1 and is available in a 8-pin SO PowerPAD™ package. Its 1.27-mm pin pitch provides adequate spacing for high-voltage applications.