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APS1056 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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APS1056 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
9 / 20 page APS1056 Fast Transient 600mA Step-Down Converter APS1056.2007.04.0.9 (PRELIMINARY INFORMATION) 9 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. Functional Description The APS1056 is a high performance 600mA 1.4MHz monolithic step-down converter. It has been designed with the goal of minimizing external component size and optimizing 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 4.7µF ceramic capacitor are recommended (see table of values). The fixed output version requires only three external power components (C IN, C OUT, and L). The adjustable version can be programmed with external feedback to any voltage, ranging from 0.6V to the input voltage. An additional feed-forward capacitor can also be added to the external feedback to pro- vide improved transient response (see Figure 1). At dropout, the converter duty cycle increases to 100% and the output voltage tracks the input volt- age minus the R DSON drop of the P-channel high- side MOSFET. The input voltage range is 2.7V to 5.5V. The con- verter efficiency has been optimized for all load conditions, ranging from no load to 600mA. The internal error amplifier and compensation pro- vides excellent transient response, load, and line regulation. Soft start eliminates any output voltage overshoot when the enable or the input voltage is applied. |
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