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ADP121-ACBZ29R7 Datasheet(PDF) 11 Page - Analog Devices |
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ADP121-ACBZ29R7 Datasheet(HTML) 11 Page - Analog Devices |
11 / 20 page ADP121 Rev. 0 | Page 11 of 20 THEORY OF OPERATION The ADP121 is a low quiescent current, low dropout linear regulators that operate from 2.3 V to 5.5 V and provide up to 150 mA of output current. Drawing a low 30 μA quiescent current (typical) at full load makes the ADP121 ideal for battery- operated portable equipment. Shutdown current consumption is typically 100 nA. Optimized for use with small 1 μF ceramic capacitors, the ADP121 provides excellent transient performance. 0.8V REFERENCE SHORT CIRCUIT, UVLO, AND THERMAL PROTECT SHUTDOWN R1 R2 VOUT VIN GND EN Figure 27. Internal Block Diagram Internally, the ADP121 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 con- trolled 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 flow 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 flow and decreasing the output voltage. The ADP121 is available in 16 output voltage options ranging from 1.2 V to 3.3 V. The ADP121 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. |
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