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TPS73534 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS73534 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 19 page  V =xV N OUT 11 V mVRMS GND EN NR IN OUT TPS735xx Optionalbypasscapacitor toreduceoutputnoise andincreasePSRR. Optionalinputcapacitor. Mayimprovesource impedance,noise,orPSRR. V IN V EN 2.2 F Ceramic m V OUT TPS73534 www.ti.com SBVS164 – JUNE 2011 APPLICATION INFORMATION X5R and X7R type capacitors are best because they The TPS73534 LDO regulators combines the high have minimal variation in value and ESR over performance required of many RF and precision temperature. Maximum ESR of the output capacitor analog applications with ultra-low current should be < 1.0Ω, so output capacitor type should be consumption. High PSRR is provided by a high gain, either ceramic or conductive polymer electrolytic. high bandwidth error loop with good supply rejection at very low headroom (VIN – VOUT). Fixed voltage Output Noise versions provide a noise reduction pin to bypass noise generated by the bandgap reference and to In most LDOs, the bandgap is the dominant noise improve PSRR while a quick-start circuit fast-charges source. If a noise reduction capacitor (CNR) is used this capacitor at startup. The combination of high with the TPS73534, the bandgap does not contribute performance and low ground current also make the significantly to noise. Instead, noise is dominated by TPS73534 an excellent choice for portable the output resistor divider and the error amplifier applications. All versions have thermal and input. To minimize noise in a given application, use a over-current protection and are fully specified 0.01 μF noise reduction capacitor; for the adjustable from –40°C to +125°C. version, smaller value resistors in the output resistor divider reduce noise. A parallel combination that Figure 20 shows the basic circuit connections for gives 2 μA of divider current has the same noise fixed voltage models. R1 and R2 can be calculated for performance as a fixed voltage version. To further any output voltage using the formula in . optimize noise, equivalent series resistance of the output capacitor can be set to approximately 0.2 Ω. This configuration maximizes phase margin in the control loop, reducing total output noise by up to 10%. Noise can be referred to the feedback point (FB pin) such that with CNR = 0.01μF, total noise is given approximately by Equation 1: (1) Board Layout Recommendations to Improve PSRR and Noise Performance Figure 20. Typical Application Circuit for To improve ac performance such as PSRR, output Fixed Voltage Versions noise, and transient response, it is recommended that the board be designed with separate ground planes Input and Output Capacitor Requirements for VIN and VOUT, with each ground plane connected Although an input capacitor is not required for only at the GND pin of the device. In addition, the stability, it is good analog design practice to connect ground connection for the bypass capacitor should a 0.1 μF to 1μF low equivalent series resistance connect directly to the GND pin of the device. (ESR) capacitor across the input supply near the regulator. The ground of this capacitor should be Internal Current Limit connected as close as the ground of output capacitor; The TPS73534 internal current limit helps protect the a capacitor value of 0.1 μF is enough in this condition. regulator during fault conditions. During current limit, When it is difficult to place these two ground points the output sources a fixed amount of current that is close together, a 1 μF capacitor is recommended. largely independent of output voltage. For reliable This capacitor counteracts reactive input sources and operation, the device should not be operated in improves transient response, noise rejection, and current limit for extended periods of time. ripple rejection. A higher-value capacitor may be necessary if large, fast rise-time load transients are The PMOS pass element in the TPS73534 has a anticipated, or if the device is located several inches built-in body diode that conducts current when the from the power source. If source impedance is not voltage at OUT exceeds the voltage at IN. This sufficiently low, a 0.1 μF input capacitor may be current is not limited, so if extended reverse voltage necessary to ensure stability. operation is anticipated, external limiting may be appropriate. The TPS73534 is designed to be stable with standard ceramic output capacitors of values 2.2 μF or larger. Copyright © 2011, Texas Instruments Incorporated 9 |
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