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AAT1126 Datasheet(PDF) 8 Page - Skyworks Solutions Inc. |
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AAT1126 Datasheet(HTML) 8 Page - Skyworks Solutions Inc. |
8 / 18 page 8 AAT1126 600mA, 1MHz Step-Down Converter DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201976B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 Functional Description The AAT1126 is a high performance 600mA 1MHz mono- lithic step-down converter. It has been designed with the goal of minimizing external component size and optimiz- ing efficiency over the complete load range. Apart from the small bypass input capacitor, only a small L-C filter is required at the output. Typically, a 4.7μH inductor and a 10μF ceramic capacitor are recommended (see Table of Values). The fixed output version requires only three external power components (CIN, COUT, and L). The adjustable ver- sion can be programmed with external feedback to any voltage, ranging from 0.6V to the input voltage. An addi- tional feed-forward capacitor can also be added to the external feedback to provide improved transient response (see Figure 1). At dropout, the converter duty cycle increases to 100% and the output voltage tracks the input voltage minus the RDSON drop of the P-channel high-side MOSFET. The input voltage range is 2.7V to 5.5V. The converter efficiency has been optimized for all load conditions, ranging from no load to heavy load. The internal error amplifier and compensation provides excellent transient response, load, and line regulation. Soft start eliminates any output voltage overshoot when the enable or the input voltage is applied. Functional Block Diagram EN LX Err . Amp Logic DH DL GND VIN OUT Voltage Reference INPUT See note Note: For adjustable version, the internal feedback divider is omitted and the OUT pin is tied directly to the internal error amplifier. |
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