LM5164DDAR

The LM5164 synchronous buck converter is designed to regulate over a wide input voltage range, reducing the need for external surge suppression components. A minimum controllable on-time of 50 ns facilitates high step-down conversion ratios, enabling direct conversion from a 48V nominal input to low voltage rails, thereby reducing system complexity and solution cost. The LM5164 operates with input voltages as low as 6V, achieving near 100% duty cycle when necessary, making it ideal for wide input voltage range industrial applications and high cell-count battery pack applications. By integrating both high-side and low-side power MOSFETs, the LM5164 delivers up to 1A of 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 quiescent current and diode emulation mode operation for improved 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 auto-recovery. An open-drain PGOOD indicator provides power sequencing, fault reporting, and output voltage monitoring capability. 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.

Applications

• Home appliances, power supplies, 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: 6 V to 100 V
• Junction temperature range: -40℃ to +150℃
• Fixed 3 ms internal soft-start timer
• Peak and valley current limit protection
• Input undervoltage lockout and thermal shutdown protection
• Scalable industrial power supplies and battery packs
• Minimum on-time and off-time of 50 ns
• Adjustable switching frequency up to 1 MHz
• Diode emulation for improved light-load efficiency
• No-load input quiescent current of 10.5 μA
• Shutdown quiescent current of 3 μA
• Optimized for CISPR 32 EMI compliance
• Integration reduces solution size and cost
• COT mode control architecture
• Integrated 0.725 Ω NFET buck switch for wide duty cycle range
• Integrated 0.34 Ω NFET synchronous rectifier eliminates external Schottky diode
• Internal 1.2 V 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