Nexperia DC-DC switching synchronous buck regulator NEX40400

The NEX40400 is a high efficiency step-down converter with low operating quiescent current of typically 60 µA. It provides up to 600 mA output with current mode control for fast loop response.

The wide 4.5 V to 40 V input range is suitable for variety of the power step-down applications in industrial and automotive environments. 0.3 µA ultra-low shutdown supply current allows use in battery-powered applications. High power conversion efficiency across a wide load range is achieved by folding down the switching frequency at light load condition reducing the switching losses.  Frequency foldback helps to prevent inductor current runaway during start-up and to allow operation in both high conversion ratio and low drop-out cases. Thermal shutdown provides reliable and robust operation.

The NEX40400 comes in a cost-effective 6 leads SOT8061-1 (TSOT23-6) plastic, surface-mounted package with 2.9 mm x 1.6 mm body dimensions.

Key features

• 4.5 V to 40 V wide input voltage range
• 600 mA continuous output current
• 60 µA standby, 0.3 µA shutdown current
• 1% output voltage accuracy
• 1.05 MHz and 2.1 MHz fixed switching frequency
• Pulse Frequency Modulation (PFM) option for light load efficiency
• Frequency foldback for high conversion ratio and low drop-out applications
• Force PWM (FPWM) option for small output ripple
• Spread spectrum for better EMI
• Start-up with pre-biased output
• Precision enable
• Internal compensation
• Short circuit protection with Hiccup mode
• SOT8061-1 (TSOT23-6) 6 leads, plastic surface-mounted package

Applications

• Industrial distributed power systems
• Grid infrastructure: Smart E-meter
• Grid infrastructure: Smart E-meter
• White goods