描述 Description

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 LM5169-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 LM5169-Q1 is available in FPWM or Auto mode operation. FPWM mode ensures forced CCM operation across the entire load range supporting isolated Fly-buck operation. Auto mode enables ultra-low IQ and diode emulation mode operation for high light-load efficiency.

特性 Features

? AEC-Q100-qualified for automotive applications
? Designed for reliable and rugged applications
? Junction temperature range: –40°C to +150°C
? Peak and valley current-limit protection
? Suited for scalable automotive HEV/EV power supplies
? Adjustable switching frequency up to 1 MHz
? Auto mode with low-quiescent current (LM5164-Q1, LM5163-Q1, LM5017, and LM34927
? Integration reduces solution size and cost
? Integrated 1.9-Ω NFET buck switch
? 1.2-V internal voltage reference
? Internal VCC bias regulator and boot diode
? 8-pin SOIC package with PowerPAD? with 30°C/W RθJA (EVM)