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TPS736125DRBRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS736125DRBRG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 26 page www.ti.com APPLICATION INFORMATION Input and Output Capacitor Requirements Optionalinputcapacitor Mayimprovesource impedance,noise,orPSRR. Optionaloutputcapacitor. Mayimproveloadtransient, noise,orPSRR. Optionalbypass capacitortoreduce outputnoise. V IN V OUT IN EN GND NR OUT TPS736xx Output Noise V N + 32mVRMS (R 1 ) R2) R 2 + 32mVRMS V OUT V REF (1) TPS73601 GND EN FB IN OUT VIN VOUT V OUT = x1.204 (R 1 + R2) R2 R 1 C FB R 2 Optionalinputcapacitor. Mayimprovesource impedance,noise,orPSRR. Optionaloutputcapacitor. Mayimproveloadtransient, noise,orPSRR. Optionalcapacitor reducesoutputnoise andimproves transientresponse. V N(mVRMS) + 27 mVRMS V V OUT(V) (2) TPS736xx SBVS038Q – SEPTEMBER 2003 – REVISED AUGUST 2007 R1 and R2 approximately euqal to 19kΩ. This 19kΩ, The TPS736xx belongs to a family of new generation in addition to the internal 8k Ω resistor, presents the LDO regulators that use an NMOS pass transistor to same impedance to the error amp as the 27k Ω achieve ultra-low-dropout performance, reverse bandgap reference output. This impedance helps current blockage, and freedom from output capacitor compensate for leakages into the error amp constraints. These features, combined with low noise terminals. and an enable input, make the TPS736xx ideal for portable applications. This regulator family offers a wide selection of fixed output voltage versions and an adjustable output version. All versions have thermal Although an input capacitor is not required for and over-current protection, including foldback stability, it is good analog design practice to connect current limit. a 0.1 μF to 1μF low ESR capacitor across the input supply near the regulator. This counteracts reactive Figure 31 shows the basic circuit connections for the input sources and improves transient response, noise fixed voltage models. Figure 32 gives the connections rejection, and ripple rejection. A higher-value for the adjustable output version (TPS73601). 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 VIN − VOUT < 0.5V and multiple low ESR capacitors are in parallel, ringing may occur when the product of COUT and total ESR drops below 50nΩF. Total ESR includes all parasitic resistances, including capacitor ESR and board, socket, and solder joint resistance. In most applications, the sum of capacitor ESR and trace resistance will meet this requirement. Figure 31. Typical Application Circuit for Fixed-Voltage Versions 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 μVRMS (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: Since the value of VREF is 1.2V, this relationship Figure 32. Typical Application Circuit for reduces to: Adjustable-Voltage Version R1 and R2 can be calculated for any output voltage using the formula shown in Figure 32. Sample for the case of no CNR. resistor values for common output voltages are shown in Figure 2. For best accuracy, make the parallel combination of Copyright © 2003–2007, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS736xx |
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