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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TPS74801DRCT Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS74801DRCT Fiches technique(HTML) 10 Page - Texas Instruments |
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10 / 19 page  www.ti.com APPLICATION INFORMATION INPUT, OUTPUT, AND BIAS CAPACITOR TRANSIENT RESPONSE V OUT C OUT 10 F m TPS74801 GND EN FB IN PG BIAS SS OUT V IN R 1 R 2 R 3 C IN 1 F m C SS V BIAS C BIAS 1 F m V =0.8 OUT ´ 1+ ´ 1.193 R 1 R 2 ) ( TPS74801 SBVS074 – JANUARY 2007 The TPS74801 belongs to a family of low dropout REQUIREMENTS regulators that feature soft-start capability. These regulators use a low current bias input to power all The device is designed to be stable for all available internal control circuitry, allowing the NMOS pass types and values of output capacitors ≥ 2.2µF. The transistor to regulate very low input and output device is also stable with multiple capacitors in voltages. parallel, which can be of any type or value. The use of an NMOS-pass FET offers several critical The capacitance required on the IN and BIAS pins is advantages for many applications. Unlike a PMOS strongly dependent on the input supply source topology device, the output capacitor has little effect impedance. To counteract any inductance in the on loop stability. This architecture allows the input, the minimum recommended capacitor for VIN TPS74801 to be stable with any capacitor type of and VBIAS is 1µF. If VIN and VBIAS are connected to value 2.2 µF or greater. Transient response is also the same supply, the recommended minimum superior to PMOS topologies, particularly for low VIN capacitor for VBIAS is 4.7µF. Good quality, low ESR applications. capacitors should be used on the input; ceramic X5R and X7R capacitors are preferred. These capacitors The TPS74801 features a programmable should be placed as close the pins as possible for voltage-controlled soft-start circuit that provides a optimum performance. smooth, monotonic start-up and limits startup inrush currents that may be caused by large capacitive loads. A power-good (PG) output is available to allow supply monitoring and sequencing of other supplies. The TPS74801 was designed to have excellent An enable (EN) pin with hysteresis and deglitch transient response within most applications with a allows slow-ramping signals to be used for small amount of output capacitance. In some cases, sequencing the device. The low VIN and VOUT the transient response may be limited by the capability allows for inexpensive, easy-to-design, and transient response of the input supply. This limitation efficient linear regulation between the multiple supply is especially true in applications where the difference voltages often present in processor intensive between the input and output is less than 300mV. In systems. this case, adding additional input capacitance improves the transient response much more than just Figure 25 illustrates the typical application circuit for adding additional output capacitance would do. With the TPS74801 adjustable input device. a solid input supply, adding additional output capacitance reduces undershoot and overshoot during a transient event; refer to Figure 17 in the Typical Characteristics section. Because the TPS74801 is stable with output capacitors as low as 2.2 µF, many applications may then need very little capacitance at the LDO output. For these applications, local bypass capacitance for the powered device may be sufficient to meet the transient requirements of the application. This design reduces the total solution cost by avoiding the need to use expensive, high-value capacitors at the LDO output. Figure 25. Typical Application Circuit for the TPS74801 (Adjustable) R1 and R2 can be calculated for any output voltage using the formula shown in Figure 25. Refer to Table 1 for sample resistor values of common output voltages. In order to achieve the maximum accuracy specifications, R2 should be ≤ 4.99kΩ. 10 Submit Documentation Feedback |
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Description similaire - TPS74801DRCT |
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