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RT7274 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT7274 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 22 page  RT7274/79/80/81 ® DS7274/79/80/81-01 February 2013 www.richtek.com 1 © Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. 2A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter Features ACOTTM Mode Enables Fast Transient Response 4.5V to 18V Input Voltage Range 2A Output Current High Efficient Internal N-MOSFET Optimized for Lower Duty Cycle Applications 105m Ω Ω Ω Ω Ω Internal Low Side N-MOSFET Advanced Constant On-Time Control Allows Ceramic Output Capacitor 700kHz Switching Frequency Adjustable Output Voltage from 0.765V to 8V Adjustable and Pre-biased Soft-Start Cycle-by-Cycle Current Limit Input Under Voltage Lockout Thermal Shutdown RoHS Compliant and Halogen Free Applications Industrial and Commercial Low Power Systems Computer Peripherals LCD Monitors and TVs Green Electronics/Appliances Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs Simplified Application Circuit General 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 indude thermal shutdown for RT7274/79/80/81; output under voltage protection and output over voltage protection for RT7279/80 only. RT7274/79/80/81 PVCC PGND* VIN VIN SS VOUT GND EN Input Signal PGOOD* Power Good BOOT SW FB VOUT* VINR* * : VINR pin for TSSOP-14 (Exposed Pad) only. VOUT pin for TSSOP-14 (Exposed Pad) only. PGND pin for TSSOP-14 (Exposed Pad) only. PGOOD pin for TSSOP-14 (Exposed Pad) only. |
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