LM5168PQDDARQ1

The LM5169-Q1 and LM5168-Q1 synchronous buck converters are 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 LM516x-Q1 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 LM5169-Q1 delivers up to 0.65-A of output current and the LM5168-Q1 delivers up to 0.3-A of output current. A constant on-time (COT) control architecture provides nearly constant switching frequency with excellent load and line transient response. The LM516x-Q1 is available in FPWM or auto mode versions. FPWM mode provides forced CCM operation across the entire load range supporting isolated fly-buck converter applications. Auto mode enables ultra-low IQ and diode emulation mode operation for high light-load efficiency.

Applications

• Communications – brick power module
• Industrial battery pack (≥10 S)
• Battery pack – e-bike/e-scooter/LEV
• HEV/EV – battery management system

Key features

• AEC-Q100-qualified for automotive applications – Device temperature grade 1: -40°C to +125°C, ambient temperature range
• Wide input voltage range of 6 V to 120 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 HEV/EV 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
• Auto mode with low-quiescent current (<10 μA)
• FPWM for fly-buck converter capability
• 3-µA shutdown quiescent current
• Pin-to-pin compatible with LM5164-Q1, LM5163-Q1, LM5017, LM5013-Q1 and LM34927
• Integration reduces solution size and cost
• COT mode control architecture
• Integrated 1.9-Ω NFET buck switch
• Integrated 0.71-Ω NFET synchronous rectifier
• 1.2-V internal voltage reference – No loop compensation components
• Internal VCC bias regulator and boot diode
• Open-drain power-good indicator
• SOIC PowerPAD integrated circuit package