描述 Description

The LM5169 and LM5168 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 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 delivers up to 0.65-A of output current and the LM5168 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 is available in FPWM or auto mode operation. FPWM mode provides 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

? Designed for reliability in rugged applications
? Junction temperature range: –40°C to +150°C
? Peak and valley current-limit protection
? Suited for scalable industrial power supplies and battery packs
? Adjustable switching frequency up to 1 MHz
? Auto mode with low quiescent current (LM5164, LM5163, 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)