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YB1220ST26MB Datasheet(PDF) 7 Page - YOBON TECHNOLOGIES,INC. |
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YB1220ST26MB Datasheet(HTML) 7 Page - YOBON TECHNOLOGIES,INC. |
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7 / 9 page  YB1220 Dual Channel 200mA LDO Regulator YB1220 MRev.1.1 www.yobon.com.tw 7 Functional Block Diagram Functional Description The YB1220 consists of two low-noise, low-quiescent current, low-dropout linear regulators and is supplied in a small SOT-26 package suitable for portable and battery-powered applications. Each channel can independently supply loads up to 200mA (typical operation, not maximum) and output voltages are preset and ranging from 1.2V to 3.6V. As shown in the Functional Block Diagram, the YB1220 consists of a single reference generating circuit, two error amplifiers, two P-channel pass transistors, independent internal feedback voltage dividers, two short circuit current limiters and one thermal shutdown protection circuit. The internal reference is connected to the error amplifier’s inverting input. The error amplifier compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the gate of pass-transistor is pulled low, allowing more current to pass to the output and increasing the output voltage. If the feedback voltage is too high, the gate of pass transistor is pulled high, resulting in less current to the output. Stability The YB1220 is a high performance LDO emphasizing stability with low output capacitance. It is able to maintain stability with an output capacitor as low as 1.0uF. The output capacitor can also be increased to optimize performance. The YB1220 will remain stable and in regulation with no load, unlike many other voltage regulators. Internal P-Channel Pass Transistor The YB1220 features a low impedance |
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