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REG71050DDCRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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REG71050DDCRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 32 page V IN Enable V OUT GND REG710 C IN 2.2mF C OUT 2.2mF C PUMP 0.22mF 4 6 3 5 1 2 REG71050, REG71055, REG710 SBAS221H – DECEMBER 2001 – REVISED OCTOBER 2015 www.ti.com 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information The REG710 is a switched capacitor voltage converter that produces a regulated, low-ripple output voltage from an unregulated input voltage range from 1.8 V to 5.5 V. The high switching frequency allows the use of small surface-mount capacitors. The following section gives guidance to choose external components to complete the power supply design. Application curves are included for the typical application shown below. 9.2 Typical Applications Figure 7. Typical Operating Circuit 9.2.1 Design Requirements The REG710 family of switched capacitor voltage converters offers a variety of regulated fixed output voltages. This family supports unregulated input voltages which can have values that are lower or higher than the regulated output voltage. Only input and output capacitors as well as a pump capacitor are required to have a fully functional converter. The following design procedure is adequate for the whole VIN, VOUT and load current range of REG710. 9.2.2 Detailed Design Procedure 9.2.2.1 Capacitor Selection For minimum output voltage ripple, the output capacitor COUT should be a ceramic, surface-mount type. Tantalum capacitors generally have a higher effective series resistance (ESR) and may contribute to higher output voltage ripple. Leaded capacitors also increase ripple due to the higher inductance of the package itself. To achieve best operation with low input voltage and high load current, the input and pump capacitors (CIN and CPUMP, respectively) should also be surface-mount ceramic types. In all cases, X7R or X5R dielectric are recommended. See the typical operating circuit shown in Figure 7 for component values. With light loads or higher input voltage, a smaller 0.1- μF pump capacitor (CPUMP) and smaller 1-μF input and output capacitors (CIN and COUT, respectively) can be used. To minimize output voltage ripple, increase the output capacitor, COUT, to 10 μF or larger. The capacitors listed in Table 2 can be used with the REG710. This table is only a representative list of compatible parts. 10 Submit Documentation Feedback Copyright © 2001–2015, Texas Instruments Incorporated Product Folder Links: REG71050 REG71055 REG710 |
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