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TPS73630DBVT Datasheet(PDF) 11 Page - Texas Instruments |
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TPS73630DBVT Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 26 page  APPLICATION INFORMATION INPUT AND OUTPUT CAPACITOR TPS736xx GND EN ON OFF NR IN OUT VIN VOUT Optionalinputcapacitor. Mayimprovesource impedance,noise,orPSRR. Optionaloutputcapacitor. Mayimproveloadtransient, noise,orPSRR. Optionalbypass capacitortoreduce outputnoise. OUTPUT NOISE TPS73601 GND EN FB IN OUT V IN V OUT V OUT = x1.204 (R 1 + R2) R 2 R 1 C FB R 2 Optionalinputcapacitor. Mayimprovesource impedance,noise,orPSRR. Optionaloutputcapacitor. Mayimproveloadtransient, noise,orPSRR. Optionalcapacitor reducesoutputnoise andimproves transientresponse. OFF ON V N + 32mVRMS (R 1 ) R2) R 2 + 32mVRMS V OUT V REF (1) V N(mVRMS) + 27 mVRMS V V OUT(V) (2) TPS736xx www.ti.com .................................................................................................................................................. SBVS038R – SEPTEMBER 2003 – REVISED MAY 2008 For best accuracy, make the parallel combination of The TPS736xx belongs to a family of new generation R1 and R2 approximately euqal to 19kΩ. This 19kΩ, LDO regulators that use an NMOS pass transistor to in addition to the internal 8k Ω resistor, presents the achieve ultra-low-dropout performance, reverse same impedance to the error amp as the 27k Ω current blockage, and freedom from output capacitor bandgap reference output. This impedance helps constraints. These features, combined with low noise compensate for leakages into the error amp and an enable input, make the TPS736xx ideal for terminals. portable applications. This regulator family offers a wide selection of fixed output voltage versions and an adjustable output version. All versions have thermal REQUIREMENTS and over-current protection, including foldback current limit. Although an input capacitor is not required for stability, it is good analog design practice to connect Figure 31 shows the basic circuit connections for the a 0.1 µF to 1µF low ESR capacitor across the input fixed voltage models. Figure 32 gives the connections supply near the regulator. This counteracts reactive for the adjustable output version (TPS73601). input sources and improves transient response, noise rejection, and ripple rejection. A higher-value capacitor may be necessary if large, fast rise-time load transients are anticipated or the device is located several inches from the power source. The TPS736xx does not require an output capacitor for stability and has maximum phase margin with no capacitor. It is designed to be stable for all available types and values of capacitors. In applications where multiple low ESR capacitors are in parallel, ringing may occur when the product of COUT and total ESR drops below 50n ΩF. Total ESR includes all parasitic resistances, including capacitor ESR and board, socket, and solder joint resistance. In most Figure 31. Typical Application Circuit for applications, the sum of capacitor ESR and trace Fixed-Voltage Versions resistance will meet this requirement. A precision band-gap reference is used to generate the internal reference voltage, VREF. This reference is the dominant noise source within the TPS736xx and it generates approximately 32 µV RMS (10Hz to 100kHz) at the reference output (NR). The regulator control loop gains up the reference noise with the same gain as the reference voltage, so that the noise voltage of the regulator is approximately given by: Figure 32. Typical Application Circuit for Adjustable-Voltage Version Since the value of VREF is 1.2V, this relationship reduces to: R1 and R2 can be calculated for any output voltage using the formula shown in Figure 32. Sample resistor values for common output voltages are shown in Figure 2. for the case of no CNR. Copyright © 2003–2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS736xx |
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