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Numéro de sérieTL1963A-25
CategoriePower Management => Regulators => Linear Voltage Regulators => LDO (Low Drop Out)
Description1.5-A Low-Noise Fast-Transient-Response LDO Regulator
The TL1963A-xx is a low-dropout (LDO) regulator optimized for fast transient response. The device can supply 1.5 A of output current with a dropout voltage of 340 mV. Operating quiescent current is 1 mA, dropping to less than 1 µA in shutdown. Quiescent current is well controlled; it does not rise in dropout as it does with many other regulators. In addition to fast transient response, the TL1963A-xx regulators have very low output noise, which makes them ideal for sensitive RF supply applications.
SociétéTexas Instruments, Inc.
DatasheetTélécharger TL1963A-25 datasheet
 
 
  • Description courte

  • FEATURES

    Optimized for Fast Transient Response Output Current: 1.5 A Dropout Voltage: 340 mV Low Noise: 40 µVRMS to 100 kHz) 1-mA Quiescent Current No Protection Diodes Needed Controlled Quiescent Current in Dropout Fixed Output Voltages: 2.5 V, and 3.3 V Adjustable Output Voltage: 20 V Less Than 1-µA Quiescent Current in Shutdown Stable with 10-µF Output Capacitor Stable with Ceramic Capacitors· Reverse-Battery Protection No Reverse Current Thermal Limiting

    APPLICATIONS
    to 2.5-V Logic Power Supplies Post Regulator for Switching Supplies

    The is a low-dropout (LDO) regulator optimized for fast transient response. The device can supply A of output current with a dropout voltage of 340 mV. Operating quiescent current is 1 mA, dropping to less than µA in shutdown. Quiescent current is well controlled; it does not rise in dropout as it does with many other regulators. In addition to fast transient response, the TL1963A-xx regulators have very low output noise, which makes them ideal for sensitive RF supply applications. Output voltage range is from 20 V. The TL1963A-xx regulators are stable with output capacitors as low as 10 µF. Small ceramic capacitors can be used without the necessary addition of ESR, as is common with other regulators. Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting, and reverse-current protection. The devices are available in fixed output voltages 2.5 V, and 3.3 V, and as an adjustable device with a 1.21-V reference voltage. The TL1963A-xx regulators are available in the 5-pin TO-263 (KTT) package. ORDERING INFORMATION (1)

    TA VOUT (TYP) 3.3 V ADJ (2) TO-263 (KTT) Reel of 500 PACKAGE (2) ORDERABLE PART NUMBER TL1963A-33KTTR TL1963AKTTR TOP-SIDE MARKING TL1963A-33 TL1963A

    For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

    Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PowerPAD, PowerFLEX are trademarks of Texas Instruments.

    UNLESS OTHERWISE NOTED this document contains PRODUCTION DATA information current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

    PIN NO. NAME DESCRIPTION Shutdown. The SHDN pin is used to put the TL1963A-xx regulators into a low-power shutdown state. The output is off when the SHDN pin is pulled low. The SHDN pin can be driven either by 5-V logic or open-collector logic with a pullup resistor. The pullup resistor is required to supply the pullup current of the open-collector gate, normally several microamperes, and the SHDN pin current, typically 3 µA. If unused, the SHDN pin must be connected to VIN. The device is in the low-power shutdown state if the SHDN pin is not connected. Input. Power is supplied to the device through the IN pin. A bypass capacitor is required on this pin if the device is more than six inches away from the main input filter capacitor. In general, the output impedance of a battery rises with frequency, it is advisable to include a bypass capacitor in battery-powered circuits. A bypass capacitor (ceramic) in the range µF is sufficient. The TL1963A-xx regulators are designed to withstand reverse voltages on the IN pin with respect to ground and the OUT pin. In the case of a reverse input, which can happen if a battery is plugged in backwards, the device acts as if there is a diode in series with its input. There is no reverse current flow into the regulator, and no reverse voltage appears at the load. The device protects both itself and the load. Ground. The exposed thermal pad is connected to ground and must be soldered to the PCB for rated thermal performance. Output. The output supplies power to the load. A minimum output capacitor (ceramic) µF is required to prevent oscillations. Larger output capacitors are required for applications with large transient loads to limit peak voltage transients. Adjust. For the adjustable TL1963A, this is the input to the error amplifier. This pin is internally clamped V. It has a bias current 3 µA that flows into the pin. The ADJ pin voltage 1.21 V referenced to ground, and the output voltage range 20 V. Sense. For fixed voltage versions of the TL1963A-1.8, TL1963A-2.5, and TL1963A-3.3), the SENSE pin is the input to the error amplifier. Optimum regulation is obtained at the point where the SENSE pin is connected to the OUT pin of the regulator. In critical applications, small voltage drops are caused by the resistance (RP) of PC traces between the regulator and the load. These may be eliminated by connecting the SENSE pin to the output at the load as shown in Figure 32. Note that the voltage drop across the external PC traces adds to the dropout voltage of the regulator. The SENSE pin bias current µA at the rated output voltage. The SENSE pin can be pulled below ground (as in a dual supply system in which the regulator load is returned to a negative supply) and still allow the device to start and operate.

    over operating free-air temperature range (unless otherwise noted)

    IN OUT VIN Input voltage range Input-to-output differential (2) SENSE ADJ SHDN tshort Tlead TJ Tstg (1) (2) Output short-circuit duration Maximum lead temperature Operating virtual-junction temperature range Storage temperature range 10-second soldering time 20 V Indefinite to 150°C

    Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Absolute maximum input-to-output differential voltage cannot be achieved with all combinations of rated IN pin and OUT pin voltages. With the IN pin 20 V, the OUT pin may not be pulled below 0 V. The total measured voltage from IN to OUT cannot exceed ±20 V.

    Maximum power dissipation is a function of TJ(max), JA, and TA. The maximum allowable power dissipation at any allowable ambient temperature PD = (TJ(max) ­ TA)/JA. Operating at the absolute maximum of 150°C can affect reliability. For packages with exposed thermal pads, such as QFN, PowerPADTM, and PowerFLEXTM, JP is defined as the thermal resistance between the die junction and the bottom of the exposed pad.