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AAT1162IRN-0.6-T1 Datasheet(PDF) 10 Page - Advanced Analogic Technologies |
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AAT1162IRN-0.6-T1 Datasheet(HTML) 10 Page - Advanced Analogic Technologies |
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10 / 16 page  AAT1162 12V, 1.5A Step-Down DC/DC Converter 10 1162.2007.09.1.2 Functional Block Diagram Control Logic + - LDO + - Reference Note 1 FB EN AGND DGND PGND LX IN AIN LDO COMP Note 1: For fixed output voltage versions, FB is connected to the error amplifier through the resistive voltage divider shown. . Internal Power + - Current Sense Amp Error Amp Current Mode Comparator Functional Description The AAT1162 is a current-mode step-down DC/DC converter that operates over a wide 4V to 13.2V input voltage range and is capable of supplying up to 1.5A to the load with the output voltage regulated as low as 0.6V. Both the P-channel power switch and N-channel synchronous rectifier are internal, reducing the number of external components required. The output voltage is adjusted by an exter- nal resistor divider; fixed output voltage versions are available upon request. The regulation system is externally compensated, allowing the circuit to be optimized for each application. The AAT1162 includes cycle-by-cycle current limiting, frequency foldback for improved short-circuit performance, and thermal overload protection to prevent damage in the event of an external fault condition. Control Loop The AAT1162 regulates the output voltage using constant frequency current mode control. The AAT1162 monitors current through the high-side P- channel MOSFET and uses that signal to regulate the output voltage. This provides improved tran- sient response and eases compensation. Internal slope compensation is included to ensure the cur- rent "inside loop" stability. High efficiency is maintained under light load con- ditions by automatically switching to variable fre- quency Light Load control. In this condition, transi- tion losses are reduced by operating at a lower fre- quency at light loads. |
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