LM5164 Synchronous Buck DC/DC Converter

By Texas Instruments 114

LM5164 Synchronous Buck DC/DC Converter

Texas Instruments' LM5164 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 operates during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for wide input supply range industrial and high cell count battery pack applications.

With integrated high-side and low-side power MOSFETs, the LM5164 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. The LM5164 device features ultra-low IQ 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 is available in a thermally-enhanced, 8-pin SO PowerPAD™ package. The 1.27 mm pin-pitch provides adequate spacing for high-voltage applications.

  • Designed for reliable and rugged applications
    • Wide input-voltage range: 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
  • Well-suited for scalable industrial power supplies and battery packs
    • Low minimum on- and off-times: 50 ns
    • Adjustable switching frequency: up to 1 MHZ
    • Diode emulation for high light-load efficiency
    • No-load input quiescent current: 10.5 µA
    • Shutdown quiescent current: 3 µA
    • Optimized for CISPR 32 EMI standard
  • Integration reduces solution size and cost
    • COT mode control architecture
    • Integrated 0.725 Ω NFET buck switch supports a wide duty-cycle range
    • Integrated 0.34 Ω NFET synchronous rectifier eliminates an external Schottky diode
    • Internal voltage reference: 1.2 V
    • No loop compensation components
    • Internal VCC bias regulator and boot diode
    • Open-drain PGOOD indicator
    • Package: 8-pin SOIC with PowerPAD
  • Appliances
  • Power and garden tools
  • Motor drives
  • Drones
  • Telecom
  • High-cell-count battery packs:
    • E-bikes and E-scooters