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TPS61256CYFFT Datasheet(PDF) 12 Page - Texas Instruments |
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TPS61256CYFFT Datasheet(HTML) 12 Page - Texas Instruments |
12 / 29 page OUT IN IN L(PEAK) OUT I V D V I = + with D 1 2 f L (1 D) V h = - - h g g g g g C 4.7 I F C 10 F O SW VIN EN VOUT GND L 1 H V IN V OUT TPS61256xC Copyright © 2017, Texas Instruments Incorporated 12 TPS61256C SLVSDQ1 – FEBRUARY 2017 www.ti.com Product Folder Links: TPS61256C Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated (1) See Third-Party Products Discalimer (2) Inductor used to characterize TPS61256xCYFF device. 10 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. 10.1 Application Information With a wide input voltage range of 2.3 V to 5.5 V, the TPS61256xC supports applications powered by Li-Ion batteries with extended voltage range. Intended for low-power applications, it supports up to 800-mA load current from a battery discharged as low as 2.65 V and allows the use of low cost chip inductor and capacitors. Different fixed voltage output versions are available from 3.15 V to 5.0 V. The TPS61256xC offers a very small solution size due to minimum amount of external components. It allows the use of small inductors and input capacitors to achieve a small solution size. During the pass-through mode, the output voltage is biased to the input voltage. 10.2 Typical Application This section details an application with TPS61256xC to output fixed 5.0 V. Figure 10. Smallest Solution Size Application 10.2.1 Design Requirements In this example, TPS61256xC is used to design a 5-V power supply with up to 800-mA output current capability. The TPS61256xC can be powered by one-cell Li-ion battery, and in this example the input voltage range is from 2.65 V to 4.85 V. 10.2.2 Detailed Design Procedure Table 1. List of Components REFERENCE DESCRIPTION PART NUMBER, MANUFACTURER(1) L(2) 1.0 μH, 1.8 A, 48 mΩ, 3.2 x 2.5 x 1.0mm max. height LQM32PN1R0MG0, muRata CI 4.7 μF, 6.3 V, 0402, X5R ceramic GRM155R60J475M, muRata CO 10 μF, 6.3 V, 0603, X5R ceramic GRM188R60J106ME84, muRata 10.2.2.1 Inductor Selection A boost converter normally requires two main passive components for storing energy during the conversion, an inductor and an output capacitor. It is advisable to select an inductor with a saturation current rating higher than the possible peak current flowing through the power switches. The inductor peak current varies as a function of the load, the input and output voltages and can be estimated using Equation 4. (4) |
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