HT3420 Datasheet | HOTCHIP

Features z 2A Output Current Wide 4.5V to 28V Operating Input Range z Integrated Power MOSFET switches z Output Adjustable from 0.925V to 0.8Vin z Up to 96% Efficiency z Programmable Soft-Start z Stable with Low ESR Ceramic Output Capacitors z Fixed 340KHZ Frequency z Cycle-by-Cycle Over Current Protection z Short Circuit Protection z Input Under Voltage Lockout z Package： SOP-8L 2A 28V Synchronous Buck Converter General Description The HT3420 is a monolithic synchronous buck regulator. The device integrates 95 mΩ MOSFETS that provide 2A continuous load current over a wide operating input voltage of 4.5V to 28V. Current mode control provides fast transient response and cycleby-cycle current limit. An adjustable softstart prevents inrush current at turn on. Applications z Distributed Power Systems z Networking Systems z FPGA, DSP, ASIC Power Supplies z Green Electronics/ Appliances z Notebook puters Typical Application Circuit 1 of 15 Ordering Information Pin Assignments Pin Descriptions Pin Number 1 2 3 4 Name BS VIN SW GND 7 EN 8 SS BS 1 VIN 2 SW 3 GND 4 SOP-8L (TOP View) 8 SS 7 EN 6 P 5 FB Description Bootstrap. This pin acts as the positive rail for the high-side switch’s gate driver. Connect a 0.01u F capacitor between BS and SW. Input Supply. Bypass this pin to GND with a low ESR capacitor. See Input Capacitor in the Application Information section. Switch Output. Connect this pin to the switching end of the inductor. Ground. Feedback Input. The voltage at this pin is regulated to 0.925V. Connect to the resistor divider between output and ground to set output voltage. pensation Pin. See Stability pensation in the Application Information section. Enable Input. When higher than 2.7V, this pin turns the IC on. When lower than 1.1V, this pin turns the IC off. Output voltage is discharged when the IC is off. This pin should not be left open. Remend to put a 100KΩ pull up resistor to Vin for start...