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SA57031-49UK Datasheet(PDF) 8 Page - NXP Semiconductors |
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SA57031-49UK Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 13 page Philips Semiconductors Product data SA57031-XX Micropower 150 mA, low-noise, low dropout linear regulator with on/off 2003 Jun 23 8 TECHNICAL DISCUSSION As illustrated in Figure 16, the SA57031 consists of a band-gap voltage reference, an error amplifier, P-channel pass transistor, current limit circuit and an internal feedback voltage divider. The output voltage is fed back through an internal resistor voltage divider connected to the VO pin. The reference is connected to the error amplifier’s inverting input. The error amplifier compares the reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass transistor’s gate is pulled lower, which allows more current to pass to the output and increase the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled up, allowing less current to pass to the output, resulting in a decrease in output voltage. SA00634 2 4 1 3 SA57031-XX VO GND ON/OFF VI VREF CURRENT LIMITER Figure 16. Block diagram (bottom view). |
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