LM5164DDAT

The LM5164 synchronous buck converter is designed for regulation over a wide input voltage range, minimizing the need for external surge suppression components. A 50ns minimum controllable on-time enables high step-down ratios, supporting direct conversion from a 48V nominal input to low voltage rails, reducing system complexity and solution cost. The LM5164 can continue operating at near 100% duty cycle as needed when the input voltage drops to 6V, making it well-suited for wide input voltage range industrial and high cell-count battery pack applications. The LM5164 features integrated high-side and low-side power MOSFETs, delivering up to 1A output current. The constant on-time (COT) control architecture provides a near-constant switching frequency with excellent load and line transient response. Additional features of the LM5164 include 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 supports power sequencing, fault reporting, and output voltage monitoring. The LM5164 is available in a thermally enhanced 8-pin SO PowerPAD package. The 1.27mm pin pitch provides adequate spacing for high-voltage applications.

Applications

• Appliances, power and garden tools
• High cell count battery packs (e-bikes, electric scooters)
• Motor drives, drones, telecommunications

Key features

• Designed for reliable and rugged applications
• Wide input voltage range: 6V to 100V
• Junction temperature range: -40°C to +150°C
• Fixed 3ms internal soft-start timer
• Peak and valley current limit protection
• Input UVLO and thermal shutdown protection
• Minimum on-time and off-time: 50ns
• Adjustable switching frequency up to 1MHz
• Diode emulation for high light-load efficiency
• 10.5μA no-load input quiescent current
• 3μA shutdown quiescent current
• Optimized for CISPR 32 EMI standards
• Reduced solution size and cost through integration
• COT mode control architecture
• Integrated 0.725Ω NFET buck switch supporting wide duty cycle range
• Integrated 0.34Ω NFET synchronous rectifier eliminates external Schottky diode
• 1.2V internal voltage reference
• No loop compensation components required
• Internal VCC bias regulator and bootstrap diode
• Open-drain power-good indicator
• 8-pin SOIC package with PowerPAD
• Create custom designs with WEBENCH Power Designer