RT7279 Datasheet | Richtek

Description The RT7274/79/80/81 is a synchronous step-down DC/ DC converter with Advanced Constant On-Time (ACOTTM) mode control. It achieves high power density to deliver up to 2A output current from a 4.5V to 18V input supply. The proprietary ACOTTM mode offers an optimal transient response over a wide range of loads and all kinds of ceramic capacitors, which allows the device to adopt very low ESR output capacitor for ensuring performance stabilization. In addition, RT7274/79/80/81 keeps an excellent constant switching frequency under line and load variation and the integrated synchronous power switches with the ACOTTM mode operation provides high efficiency in whole output current load range. Cycle-by-cycle current limit provides an accurate protection by a valley detection of low-side MOSFET and external soft-start setting eliminates input current surge during startup. Protection functions include thermal shutdown for RT7274/79/80/81; output under voltage protection and output over voltage protection for RT7279/80 only. Features z ACOTTM Mode Enables Fast Transient Response z 4.5V to 18V Input Voltage Range z 2A Output Current z High Efficient Internal N-MOSFET Optimized for Lower Duty Cycle Applications z 105mΩ Internal Low-Side N-MOSFET z Advanced Constant On-Time Control z Allows Ceramic Output Capacitor z 700k Hz Switching Frequency z Adjustable Output Voltage from 0.765V to 8V z Adjustable and Pre-biased Soft-Start z Cycle-by-Cycle Current Limit z Input Under Voltage Lockout z Thermal Shutdown z Ro HS pliant and Halogen Free Applications z Industrial and mercial Low Power Systems z puter Peripherals z LCD Monitors and TVs z Green Electronics/Appliances z Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs Simplified Application Circuit Input Signal Power Good RT7274/79/80/81 VIN SW VINR- EN BOOT FB GND- PGOOD- PVCC VOUT- SS PGND- VOUT - : VINR pin for TSSOP-14 (Exposed Pad) only. VOUT pin for TSSOP-14 (Exposed Pad) only. PGND...