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TPS72301-Q1 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS72301-Q1 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 16 page  OUT FB GND EN IN R1 1 2 3 4 5 R2 V = 1.186 – OUT 1+ R1 R2 R1+R2 ≈ 100kΩ TPS72301-Q1 TPS72325-Q1 www.ti.com SLVSAJ4B – SEPTEMBER 2010 – REVISED SEPTEMBER 2012 APPLICATION INFORMATION DEVICE OPERATION CURRENT LIMIT The TPS723xx-Q1 is a low-dropout negative linear The TPS723xx-Q1 has internal circuitry that monitors voltage regulator with a rated current of 200 mA. It and limits output current to protect the regulator from features very low noise and high power-supply damage under all load conditions. When output rejection ratio (PSRR), making it ideal for high- current reaches the output-current limit (550 mA sensitivity analog and RF applications. A shutdown typical), protection circuitry turns on, reducing output mode is available, reducing ground current to 2 μA voltage to ensure that current does not increase. See maximum over temperature and process. The Figure 8 in the Typical Characteristics section. TPS723xx-Q1 comes in a small SOT23 package, Do not drive the output more than 0.3 V above the specified over a –40°C to 125°C junction-temperature input. Doing so biases the body diode in the pass range. FET, allowing current to flow from the output to the input. The device does not limit this current. If this ENABLE condition is likely, take care to limit the reverse current externally. The enable pin is active above 1.5 V and below –1.5 V, allowing control by a standard TTL signal or by connection to VI if not used. Driving the pin to GND THERMAL PROTECTION turns off most internal circuitry, putting the TPS723xx- As protection from damage due to excessive junction Q1 into shutdown mode, drawing 2- μA maximum temperatures, the TPS723xx-Q1 has internal ground current. protection circuitry. When junction temperature reaches approximately 165°C, the output device turns CAPACITOR SELECTION FOR STABILITY off. After the device has cooled by about 20°C, the output device turns on, allowing normal operation. For Use appropriate input and output capacitors for the reliable operation, design is for worst-case junction intended application. The TPS723xx-Q1 only requires temperature of ≤ 125°C, taking into account worst- the use of a 2.2- μF ceramic output capacitor for case ambient temperature and load conditions. stable operation. Both the capacitor value and ESR affect stability, output noise, PSRR, and transient response. For typical applications, a 2.2- μF ceramic ADJUSTABLE VOLTAGE APPLICATIONS output capacitor located close to the regulator is The TPS72301-Q1 allows designers to specify any sufficient. output voltage from –10 V to –1.2 V. As shown in the application circuit in Figure 24, use of an external OUTPUT NOISE resistor divider scales the output voltage (VOUT) to the reference voltage. For best accuracy, use precision Without external bypassing, output noise of the resistors for R1 and R2. Use the equations in TPS723xx-Q1 from 10 Hz to 100 kHz is 200 μVRMS Figure 24 to determine the values for the resistor typical. The dominant contributor to output noise is divider. the internal band-gap reference. Adding an external 0.01- μF capacitor to ground reduces the noise to 60 μVRMS. To achieve best noise performance, use appropriate low-ESR capacitors for bypassing noise at the NR and OUT pins. See Figure 18 in the Typical Characteristics section. POWER-SUPPLY REJECTION The TPS723xx-Q1 offers a very high PSRR for applications with noisy input sources or highly sensitive output supply lines. For best PSRR, use high-quality input and output capacitors. Figure 24. TPS72301-Q1 Adjustable LDO Regulator Programming Copyright © 2010–2012, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS72301-Q1 TPS72325-Q1 |
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