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ADP151AUJZ-1.8-R7 Scheda tecnica(PDF) 11 Page - Analog Devices |
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ADP151AUJZ-1.8-R7 Scheda tecnica(HTML) 11 Page - Analog Devices |
11 / 24 page ADP151 Rev. 0 | Page 11 of 24 THEORY OF OPERATION The ADP151 is an ultralow noise, low quiescent current, low dropout linear regulator that operates from 2.2 V to 5.5 V and can provide up to 200 mA of output current. Drawing a low 265 μA of quiescent current (typical) at full load makes the ADP151 ideal for battery-operated portable equipment. Shut- down current consumption is typically 200 nA. Using new innovative design techniques, the ADP151 provides superior noise performance for noise-sensitive analog and RF applications without the need for a noise bypass capacitor. The ADP151 is also optimized for use with small 1 µF ceramic capacitors. REFERENCE SHORT CIRCUIT, UVLO, AND THERMAL PROTECT SHUTDOWN R1 R2 REN VOUT VIN GND EN Figure 25. Internal Block Diagram Internally, the ADP151 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. An internal pull-down resistor on the EN input holds the input low when the pin is left open. The ADP151 is available in 16 output voltage options, ranging from 1.1 V to 3.3 V. The ADP151 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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