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YB1231ST8RX330 Datasheet(PDF) 6 Page - YOBON TECHNOLOGIES,INC. |
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YB1231ST8RX330 Datasheet(HTML) 6 Page - YOBON TECHNOLOGIES,INC. |
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6 / 10 page  YB1231 – HV600mA Low-Noise LDO Regulator YB1231 MRev. 1.4 www.yobon.com.tw 6 SHUTDOWN AND POWER-ON CONTROL THERMAL SENSOR ERROR AMP REFERENCE AND NOISE BYPASS MOS DRIVER WITH LIMIT IN GND EN OUT P Figure 3. Block Diagram Functional Block Diagram Functional Description The YB1231 is an ultra-low-noise, low-quiescent current, low-dropout linear regulator. It is supplied in a SOT-23 / SOT-25 / SOT-89 package for different applications. These devices can supply loads up to 600mA. As shown in the Functional Block Diagram, the YB1231 consists of a reference and noise bypass circuit, error amplifier, output drive transistor, internal feedback voltage divider, thermal sensor, and short circuit current limiter. 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 pass-transistor gate is pulled low. This allows more current to pass to the output and increases the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled high, allowing less current to pass to the output. The parts are available with preset output voltages ranging from 3.2V to 4.5V. Stability The YB1231 is a high performance LDO emphasizing stability with low output capacitance. It is able to maintain stability with an output capacitor as low as 2.2 uF. The output capacitor can also be increased to optimize performance. The YB1231 will remain stable and in regulation with no load, unlike many other voltage regulators. Internal P-Channel Pass Transistor The YB1231 features a low impedance P-channel MOSFET pass transistor. This provides several advantages over similar |
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