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MAX8815AETB+ Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX8815AETB+ Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page 1A, 97% Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown 8 _______________________________________________________________________________________ Detailed Description The MAX8815A current-mode step-up DC-DC switching converter uses a fixed-frequency PWM architecture with True Shutdown. In normal mode, the converter switches when needed, consuming only 30µA of quiescent cur- rent. In forced-PWM mode (FPWM), the converter switches every cycle at a constant frequency, thus enabling noise filtering. The MAX8815A is highly effi- cient, with an internal switch and synchronous rectifier. Shutdown reduces the quiescent current to less than 0.1µA. Low quiescent current and high efficiency make this device ideal for powering portable equipment. The MAX8815A step-up DC-DC switching converter typ- ically generates a 3.3V to 5V output voltage from a 1.2V to 5.5V battery input voltage. The converter operates in bootstrapped mode with the output powering the device once the output voltage is ≥ 3V. The current limit is set at 2.5A to deliver 1A at 5V from a 2.5V input, or 500mA at 5V using a 2-cell 1.8V input. Internal soft-start limits the inrush current to less than 500mA under no-load condi- tions during startup. The MAX8815A switches at a 2MHz frequency, allow- ing for tiny external components. Internal compensation further reduces the external component count in cost and space-sensitive applications. The MAX8815A is optimized for use in DSC and other applications requir- ing low quiescent current for maximum battery life. Figures 1a and 1b show the typical application circuits. ON SKIPB POUT BATT LX FB OUTS GND ON ON 3V ON ON PGND CONTROL 2MHz OSCILLATOR REFERENCE EP + - STARTUP OSCILLATOR MAX8815A Functional Diagram |
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