NR421A

Buck type Synchronous Switching Regulator IC NR421A DATA SHEET General Descriptions The NR421A is Synchronous Rectification buck regulator ICs integrates PowerMOSFETs. With the current mode control, low ESR capacitors such as ceramic capacitors can be used. It has achieved a high efficiency by the synchronous rectification system. The ICs have protection functions such as Over-Current Protection (OCP), Under-Voltage Lockout (UVLO) and Thermal Shutdown (TSD). Soft starting time can be set up by selecting an external capacitor value. The ON/OFF pin (EN Pin) turns the regulator ON/OFF. The NR421A is available in an 8-pin HSOP package with an exposed thermal pad on the back side. Features & Benefits ● For excellent heat dissipation, HSOP8 package with the heat-slug is adopted. ● Current mode PWM control ● Up to 94% efficiency ● Stable with low ESR ceramic output capacitors ● Built-in protection function Drooping type Over Current Protection (OCP) with Auto-restart Thermal Shutdown (TSD) with Auto-restart Under Voltage Lockout(UVLO) ● By the internal Phase Compensation, external component count reduction ● Adjustable Soft-Start with an external capacitor ● Output ON/OFF function (Enable) Basic Circuit Connection Package ● HSOP8 Thermally enhanced 8-Pin package *Image: Not to scale Electrical Characteristics ● Input voltage range VIN = 4.5 to 18V ● Output voltage range VO=0.8V to 14V ● Operation Frequency FSW= 350kHz Fixed Applications ● LCD-TV ● Blu-ray ● Power supply for digit...