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TPS74801-Q1 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS74801-Q1 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 22 page  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+ R 1 R 2 ) ( TPS74801-Q1 www.ti.com SLVSAI4A – OCTOBER 2010 – REVISED FEBRUARY 2011 APPLICATION INFORMATION The TPS74801-Q1 belongs to a family of low dropout R1 and R2 can be calculated for any output voltage regulators that feature soft-start capability. These using the formula shown in Figure 25. Refer to regulators use a low current bias input to power all Table 1 for sample resistor values of common output internal control circuitry, allowing the NMOS pass voltages. In order to achieve the maximum accuracy transistor to regulate very low input and output specifications, R2 should be ≤ 4.99kΩ. voltages. The use of an NMOS-pass FET offers several critical INPUT, OUTPUT, AND BIAS CAPACITOR advantages for many applications. Unlike a PMOS REQUIREMENTS topology device, the output capacitor has little effect The device is designed to be stable for all available on loop stability. This architecture allows the types and values of output capacitors ≥ 2.2μF. The TPS74801-Q1 to be stable with any capacitor type of device is also stable with multiple capacitors in value 2.2 μF or greater. Transient response is also parallel, which can be of any type or value. superior to PMOS topologies, particularly for low VIN applications. The capacitance required on the IN and BIAS pins strongly depends on the input supply source The TPS74801-Q1 features a programmable impedance. To counteract any inductance in the voltage-controlled soft-start circuit that provides a input, the minimum recommended capacitor for VIN smooth, monotonic start-up and limits startup inrush and VBIAS is 1μF. If VIN and VBIAS are connected to currents that may be caused by large capacitive the same supply, the recommended minimum loads. A power good (PG) output is available to allow capacitor for VBIAS is 4.7μF. Good quality, low ESR supply monitoring and sequencing of other supplies. capacitors should be used on the input; ceramic X5R An enable (EN) pin with hysteresis and deglitch and X7R capacitors are preferred. These capacitors allows slow-ramping signals to be used for should be placed as close the pins as possible for sequencing the device. The low VIN and VOUT optimum performance. capability allows for inexpensive, easy-to-design, and efficient linear regulation between the multiple supply voltages often present in processor-intensive TRANSIENT RESPONSE systems. The TPS74801-Q1 was designed to have excellent Figure 25 illustrates the typical application circuit for transient response for most applications with a small the TPS74801-Q1 adjustable output device. amount of output capacitance. In some cases, the transient response may be limited by the transient response of the input supply. This limitation is especially true in applications where the difference between the input and output is less than 300mV. In this case, adding additional input capacitance improves the transient response much more than just adding additional output capacitance would do. With a solid input supply, adding additional output capacitance reduces undershoot and overshoot during a transient event; refer to Figure 22 in the Typical Characteristics section. Because the TPS74801-Q1 is stable with output capacitors as low as 2.2 μF, many applications may then need very little Figure 25. Typical Application Circuit for the capacitance at the LDO output. For these TPS74801-Q1 (Adjustable) 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. © 2010–2011, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS74801-Q1 |
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