 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
TPS73219 Datasheet(PDF) 12 Page - Texas Instruments |
|
||||||||||||||||||||||||||||||
TPS73219 Datasheet(HTML) 12 Page - Texas Instruments |
|
|
12 / 20 page  V N + 32mVRMS (R 1 ) R2) R 2 + 32mVRMS V OUT V REF TPS732xx GND EN ON OFF NR IN OUT VIN VOUT Optionalinputcapacitor. Mayimprovesource impedance,noise,orPSRR. Optionaloutputcapacitor. Mayimproveloadtransient, noise,orPSRR. Optionalbypass capacitortoreduce outputnoise. V N(mVRMS) + 27 mVRMS V V OUT(V) V N(mVRMS) + 8.5 mVRMS V V OUT(V) TPS73219 SBVS166 – JUNE 2011 www.ti.com APPLICATION INFORMATION types and values of capacitors. In applications where The TPS73219 belongs to a family of new generation multiple low ESR capacitors are in parallel, ringing LDO regulators that use an NMOS pass transistor to may occur when the product of COUT and total ESR achieve ultra-low-dropout performance, reverse drops below 50n ΩF. Total ESR includes all parasitic current blockage, and freedom from output capacitor resistances, including capacitor ESR and board, constraints. These features, combined with low noise socket, and solder joint resistance. In most and an enable input, make the TPS73219 ideal for applications, the sum of capacitor ESR and trace portable applications. This regulator family offers a resistance will meet this requirement. wide selection of fixed output voltage versions and an adjustable output version. All versions have thermal OUTPUT NOISE and over-current protection, including foldback current limit. A precision band-gap reference is used to generate the internal reference voltage, VREF. This reference is Figure 31 shows the basic circuit connections for the the dominant noise source within the TPS73219 and fixed voltage models. 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: (1) Since the value of VREF is 1.2V, this relationship reduces to: (2) for the case of no CNR. Figure 31. Typical Application Circuit for Fixed-Voltage Versions An internal 27k Ω resistor in series with the noise reduction pin (NR) forms a low-pass filter for the For best accuracy, make the parallel combination of voltage reference when an external noise reduction R1 and R2 approximately equal to 19kΩ. This 19kΩ, capacitor, CNR, is connected from NR to ground. For in addition to the internal 8k Ω resistor, presents the CNR = 10nF, the total noise in the 10Hz to 100kHz same impedance to the error amp as the 27k Ω bandwidth is reduced by a factor of ~3.2, giving the bandgap reference output. This impedance helps approximate relationship: compensate for leakages into the error amp terminals. (3) INPUT AND OUTPUT CAPACITOR for CNR = 10nF. REQUIREMENTS This noise reduction effect is shown as RMS Noise Although an input capacitor is not required for Voltage vs CNR (Figure 20) in the Typical stability, it is good analog design practice to connect Characteristics section. a 0.1 μF to 1μF low ESR capacitor across the input supply near the regulator. This counteracts reactive The TPS73219 uses an internal charge pump to input sources and improves transient response, noise develop an internal supply voltage sufficient to drive rejection, and ripple rejection. A higher-value the gate of the NMOS pass element above VOUT. The capacitor may be necessary if large, fast rise-time charge pump generates ~250 μV of switching noise at load transients are anticipated or the device is ~4MHz; however, charge-pump noise contribution is located several inches from the power source. negligible at the output of the regulator for most values of IOUT and COUT. The TPS73219 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 12 Copyright © 2011, Texas Instruments Incorporated |
Similar Part No. - TPS73219 |
|
Similar Description - TPS73219 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
