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LM3243 Datasheet(PDF) 15 Page - Texas Instruments |
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LM3243 Datasheet(HTML) 15 Page - Texas Instruments |
15 / 32 page ![]() LM3243 PVIN VDD SW FB VCON PGND SGND EN MODE VBATT VOUT ACB BP VCC_PA_2G BB or RFIC DAC GPO2 GPO1 BGND 1.5 µH 10 µF 1.0 µF PA 4.7 µF PA(s) VCC_PA_3G 10 µF LM3243 www.ti.com SNVS782C – OCTOBER 2010 – REVISED AUGUST 2015 8 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. 8.1 Application Information The LM3243 DC-DC converter steps down an input voltage from 2.7 V to 5.5 V to a dynamically adjustable output voltage of 0.4 V to 3.6 V. 8.2 Typical Application Figure 17. LM3243 Typical Application 8.2.1 Design Requirements For typical step-down converter applications, use the parameters listed in Table 2. Table 2. Design Parameters DESIGN PARAMETER EXAMPLE VALUE Input voltage 2.7 V to 5.5 V Minimum output voltage 0.4 V to 3.6 V Output current range 0 to 2.5 A 8.2.2 Detailed Design Procedure 8.2.2.1 Inductor Selection A 1.5 µH inductor is needed for optimum performance and functionality of the LM3243. In the case of 2G transmission current bursts, the effective overall RMS current requirements are reduced. Therefore, please consult with the inductor manufacturers to determine if some of their smaller components will meet your application needs even though the classical inductor specification does not appear to meet the LM3243 RMS current specifications. LM3243 automatically manages the inductor peak and RMS (or steady current peak) current through the SW pin. The SW pin has two positive current limits. The first is the 1.45 A typical (or 1.65 A maximum.) over-limit current protection. It sets the upper steady-state inductor peak current (as detailed in the Electrical Characteristics Table - ILIM,PFET,SteadyState). It is the dominant factor limiting the inductor's ISAT requirement. The second is a over-limit current protection. It limits the maximum peak inductor current during large signal transients (that is, < 20 µs) to 1.9 A typical (or 2.1 A maximum). A minimum inductance of 0.3 µH should be maintained at the second current limit. Copyright © 2010–2015, Texas Instruments Incorporated Submit Documentation Feedback 15 Product Folder Links: LM3243 |
Similar Part No. - LM3243_15 |
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Similar Description - LM3243_15 |
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