RT9164A PDF

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The RTA series of high performance positive voltage regulators is designed for applications requiring low dropout performance at fully rated current. Additionally, the RTA series provides excellent regulation over variations in line and load.

Outstanding features include low dropout performance at rated current, fast transient response, internal current-limiting, and thermal-shutdown protection of the output device. Low Dropout Performance, 1. RTA Note 1. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability.

Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. Low duty cycle pulse testing with Kelvin connections. Note 5. Note 6. Like most regulators, the RTA regulates the output by comparing the output voltage to an internally generated reference voltage. The voltage ratio formed by R1 and R2 should be set to conduct 10mA minimum output load.

The output voltage is given by the following equation:. This is to ensure stability at the output terminal.

The output capacitor does not have a theoretical upper limit and increasing its value will increase stability. An input capacitor is recommended. The adjust terminal can be bypassed to ground with a bypass capacitor CADJ to improve ripple rejection.

This bypass capacitor prevents ripple from being amplified as the output voltage is increased. At any ripple frequency, the impedance of the CADJ should be less than R1 to prevent the ripple from being amplified:.

When the adjustable regulator is used Figure 6 , the best load regulation is accomplished when the top of the resistor divider R1 is connected directly to the output pin of the RTA. When so connected, RP is not multiplied by.

For Fixed output version, the top of R1 is internally connected to the output and ground pins can be connected to low side of the load.

The R1 is the resistor between the output and the adjust pin. Figure 6. Current protection is triggered at typically 1. Thermal Consideration The RTA series contain thermal limiting circuitry designed to protect itself from over-temperature conditions.

Even for normal load conditions, maximum junction temperature ratings must not be exceeded. As mention in thermal protection section, we need to consider all sources of thermal resistance between junction and ambient. It includes junction-to-case, case-to-heat-sink interface, and heat sink thermal resistance itself.

Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. Proper mounting is required to ensure the best possible thermal flow from this area of the package to the heat sink. The case of all devices in this series is electrically connected to the output. Therefore, if the case of the device must be electrically isolated, a thermally conductive spacer is recommended. See More. Figure 1. Figure 2. Temperature Reference Voltage vs.

Temperature 1. Temperature 2 3 2. At any ripple frequency, the impedance of the CADJ should be less than R1 to prevent the ripple from being amplified: When the adjustable regulator is used Figure 6 , the best load regulation is accomplished when the top of the resistor divider R1 is connected directly to the output pin of the RTA.

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