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TPS74901RGWT Datasheet(PDF) 11 Page - Texas Instruments |
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TPS74901RGWT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 36 page Thermal Limit Soft-Start Discharge OUT V OUT FB PG IN BIAS SS EN Hysteresis and Deglitch Current Limit UVLO 0.44 A m 0.8V Reference 0.9 V ´ REF GND C SS R 1 R 2 Copyright © 2016, Texas Instruments Incorporated 11 TPS74901 www.ti.com SBVS082I – JUNE 2007 – REVISED MAY 2016 Product Folder Links: TPS74901 Submit Documentation Feedback Copyright © 2007–2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The TPS74901 belongs to a family of low-dropout regulators that feature soft-start capabilities. These regulators use a low-current bias input to power all internal control circuitry, allowing the NMOS pass transistor to regulate very-low input and output voltages. The use of an NMOS-pass FET offers several critical advantages for many applications. Unlike a PMOS topology device, the output capacitor has little effect on loop stability. This architecture allows the TPS74901 to be stable with any capacitor with a value of 2.2 µF or greater. Transient response is also superior to PMOS topologies, particularly for low VIN applications. The TPS74901 features a programmable voltage-controlled soft-start circuit that provides a smooth, monotonic start-up and limits start-up 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. An enable (EN) pin with hysteresis and deglitch allows slow-ramping signals to be used for sequencing the device. The low VIN and VOUT capability allows for inexpensive, easy-to-design, and efficient linear regulation between the multiple supply voltages often present in processor-intensive systems. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Enable and Shutdown The enable (EN) pin is active high and is compatible with standard digital-signaling levels. VEN below 0.4 V turns the regulator off and VEN above 1.1 V turns the regulator on. Unlike many regulators, the enable circuitry has hysteresis and deglitching for use with relatively slowly ramping analog signals. This configuration allows the TPS74901 to be enabled by connecting the output of another supply to the EN pin. The enable circuitry typically has 50 mV of hysteresis and a deglitch circuit to help avoid ON-OFF cycling because of small glitches in the VEN signal. The enable threshold is typically 0.8 V and varies with temperature and process variations. Temperature variation is approximately –1 mV/°C; process variation accounts for most of the rest of the variation to the 0.4-V and 1.1-V limits. If precise turnon timing is required, a fast rise-time signal must be used to enable the TPS74901. |
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