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ADP120-AUJZ15R7 датащи(PDF) 11 Page - Analog Devices |
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ADP120-AUJZ15R7 датащи(HTML) 11 Page - Analog Devices |
11 / 20 page ADP120 Rev. A | Page 11 of 20 THEORY OF OPERATION The ADP120 is a low quiescent current, low dropout linear regulator that operates from 2.3 V to 5.5 V and provides up to 100 mA of output current. Drawing a low 22 μA of quies- cent current (typical) at full load makes the ADP120 ideal for battery-operated portable equipment. Shutdown current consumption is typically 100 nA. Optimized for use with small 1 μF ceramic capacitors, the ADP120 provides excellent transient performance. VIN VOUT R1 R2 GND EN SHORT CIRCUIT, UVLO, AND THERMAL PROTECT 0.8V REFERENCE SHUTDOWN Figure 27. Internal Block Diagram Internally, the ADP120 consists of a reference, an error amplifier, a feedback voltage divider, and a PMOS pass transistor. Output current is delivered via the PMOS pass device, which is controlled by the error amplifier. The error amplifier compares the reference voltage with the feedback voltage from the output and amplifies the difference. If the feedback voltage is lower than the reference voltage, the gate of the PMOS device is pulled lower, allowing more current to pass and increasing the output voltage. If the feedback voltage is higher than the reference voltage, the gate of the PMOS device is pulled higher, allowing less current to pass and decreasing the output voltage. The ADP120 is available in 16 output voltage options, ranging from 1.2 V to 3.3 V. The ADP120 uses the EN pin to enable and disable the VOUT pin under normal operating conditions. When EN is high, VOUT turns on; when EN is low, VOUT turns off. For automatic startup, EN can be tied to VIN. |
Аналогичный номер детали - ADP120-AUJZ15R7 |
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Аналогичное описание - ADP120-AUJZ15R7 |
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