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YB1253ST8RX280 Datasheet(PDF) 7 Page - YOBON TECHNOLOGIES,INC. |
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YB1253ST8RX280 Datasheet(HTML) 7 Page - YOBON TECHNOLOGIES,INC. |
7 / 11 page YB1253 300mA, Low Power, High PSRR LDO Regulator YB1253 Rev. 1.5 www.yobon.com.tw 7 Functional Block Diagram Vref Thermal shutdown Short Circuit Protection VIN VOUT GND EN Figure 3 : Function diagram Functional Description The YB1253 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. YB1253 can supply load current up to 300mA (typical operation, not maximum) with good line and load regulation. Output voltages are preset and ranging from 1.2V to 3.6V. As shown in the Functional Block Diagram, the YB1253 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 gate of the pass-transistor 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 gate of the pass transistor is pulled high, allowing less current to pass to the output. Stability The YB1253 is a high performance LDO emphasizing stability with low output capacitance. It is able to maintain stability with an output capacitor as low as 1.0µF. The output capacitor can also be increased to optimize performance. The YB1253 will remain stable and in regulation with no load, unlike many other voltage regulators. |
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Similar Description - YB1253ST8RX280 |
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