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RT7276 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT7276 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 24 page  RT7275/76 ® DS7275/76-00 January 2013 www.richtek.com 1 © Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. 3A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter Simplified Application Circuit General Description The RT7275/76 are high-performance 700kHz 3A step- down regulators with internal power switches and synchronous rectifiers. They feature quick transient response using their Advanced Constant On-Time (ACOTTM) control architecture that provides stable operation with small ceramic output capacitors and without complicated external compensation, among other benefits. The input voltage range is from 4.5V to 18V and the output is adjustable from 0.765V to 8V. The proprietary ACOTTM control improves upon other fast- response constant on-time architectures, achieving nearly constant switching frequency over line, load, and output voltage ranges. Since there is no internal clock, response to transients is nearly instantaneous and inductor current can ramp quickly to maintain output regulation without large bulk output capacitance. The RT7275/76 are stable with and optimized for ceramic output capacitors. With internal 90m Ω switches and 60mΩ synchronous rectifiers, the RT7275/76 display excellent efficiency and good behavior across a range of applications, especially for low output voltages and low duty cycles. Cycle-by- cycle current limit, input under-voltage lock-out, externally-adjustable soft-start, output under- and over- voltage protection, and thermal shutdown provide safe and smooth operation in all operating conditions. The RT7275 and RT7276 are each available in WDFN-10L 3x3 and PTSSOP-14 packages, with exposed thermal pads. RT7275/76 PVCC VIN VIN SS VOUT EN Input Signal PGOOD Power Good BOOT SW FB VOUT VINR PGND GND Features Fast Transient Response Steady 700kHz Switching Frequency At all Load Currents (RT7275) Discontinuous Operating Mode at Light Load (RT7276) 3A Output Current Advanced Constant On-Time (ACOT TM) Control Optimized for Ceramic Output Capacitors 4.5V to 18V Input Voltage Range Internal 90m Ω Ω Ω Ω Ω Switch and 60mΩ Ω Ω Ω Ω Synchronous Rectifier 0.765V to 8V Adjustable Output Voltage Externally-adjustable, Pre-biased Compatible Soft- Start Cycle-by-Cycle Current Limit Optional Output Discharge Function (PTSSOP-14 Only) Output Over- and Under-voltage Shut-down 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 Not Recommended for Sink/Source Applications Fast-Transient Response VOUT = 12V, VOUT = 1.05V, IOUT = 0 to 3A Time (100 μs/Div) IOUT (2A/Div) VOUT (20mV/Div) RT7275 |
Similar Part No. - RT7276 |
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Similar Description - RT7276 |
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