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NCP729FC30T2G Datasheet(PDF) 11 Page - ON Semiconductor |
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NCP729FC30T2G Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 13 page NCP729 http://onsemi.com 11 APPLICATIONS INFORMATION General The NCP729 is a high performance 200 mA Very Low Dropout Linear Regulator. This device delivers excellent noise and dynamic performance. It features typical quiescent current of 35 mA at no−load, ultra−low noise of 10 mVRMS and high PSRR of 72 dB at 1 kHz. Such excellent dynamic parameters and small package size make the device an ideal choice for powering the precision analog and noise sensitive circuitry in portable applications. NCP729 requires very small voltage headroom for correct operation. The dropout for 3.3 V voltage option is only 68 mV (typ.) A logic EN input provides ON/OFF control of the output voltage. When the EN is low the device consumes as low as typ. 300 nA from the IN pin. The device is fully protected in case of output overload, output short circuit condition and overheating, assuring a very robust design. Input Capacitor (CIN) It is recommended to connect a minimum of 1 mF Ceramic X5R or X7R capacitor close to the IN pin of the device. This capacitor will provide a low impedance path for unwanted AC signals or noise modulated onto constant input voltage. There is no requirement for the min./max. ESR of the input capacitor but it is recommended to use ceramic capacitors for their low ESR and ESL. A good input capacitor will limit the influence of input trace inductance and power source resistance during sudden load current changes. Larger input capacitor may be necessary if fast and large line/load transients are encountered in the application. Output Capacitor (COUT) The NCP729 is designed to operate with a small 1.0 mF ceramic capacitor on the output. To assure proper operation it is recommended to use min. 1.0 mF capacitor with the initial tolerance of ±10%, made of X7R or X5R dielectric material types. NCP729 is internally compensated so there is no requirement for the minimum value of Equivalent Series Resistance (ESR) for the COUT but the maximum value of ESR should be less than 500 m W. Larger output capacitors could be used to improve the load transient response or high frequency PSRR. This part is not designed to work with tantalum or electrolytic capacitors on the output due to their large ESR and ESL. The equivalent series resistance of tantalum capacitors is also strongly dependent on the temperature, increasing at low temperatures. The tantalum capacitors are generally more costly than ceramic capacitors. The table below lists examples of suitable output capacitors: Part Number Description C0402C105K8PACTU 1 mF Ceramic ±10%, 10 V, 0402, X5R C1005X5R1A105K -||- GRM155R61A105KE15D -||- 0402ZD105KAT2A -||- MCCA000571 1 mF Ceramic ±10%, 50 V, 1206, X7R ECJ−0EB0J475M 4.7 mF Ceramic ±20%, 6.3 V, 0402, X5R No−load Operation The regulator remains stable and regulates the output voltage properly within the ±2% tolerance limits with no external load applied to the output. Enable Operation The NCP729 uses the EN pin to enable, disable its output and to deactivate, activate the active output discharge function. If the EN pin voltage is <0.4 V the device is guaranteed to be disabled. The pass transistor is turned−off and the active discharge transistor is active so that the output voltage VOUT is pulled to GND through a 1 k W resistor. In the disable state the device consumes as low as typ. 300 nA from the VIN. If the EN pin voltage > 0.9 V the device is guaranteed to be enabled. The output voltage is regulated at the nominal value and the active discharge transistor is turned−off. The EN pin has internal pull−down current source with typ. value of 110 nA which assures that the device is turned−off when the EN pin is not connected. A build in 2 mV of hysteresis in the EN prevents from periodic on/off oscillations that can occur due to noise. In the case where the EN function isn’t required the EN pin should be tied directly to IN. Undervoltage Lockout The internal UVLO circuitry assures that the device becomes disabled when the VIN falls below typ. 1.5 V. When the VIN voltage ramps−up the NCP729 becomes enabled for VIN ≥ 1.6 V. The 100 mV hysteresis prevents from on/off oscillations that can occur due to noise on VIN line. Reverse Current The PMOS pass transistor has an inherent body diode which will be forward biased in the case that VOUT > VIN. Due to this fact in cases where the extended reverse current condition is anticipated the device may require additional external protection. |
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