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TPS61291DRVT Datasheet(PDF) 11 Page - Texas Instruments |
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TPS61291DRVT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page OUT OUT L max IN L max V I I : = 150 mA continuous current operation 0.8 V I : = 300 mA discontinuous current operation ´ + ´ TPS61291 www.ti.com SLVSBX9A – SEPTEMBER 2014 – REVISED SEPTEMBER 2014 Typical Application (continued) Table 1. Components for Application Characteristic Curves(1) Reference Description Value Manufacturer Low Iq Boost Converter with TPS61291 Texas Instruments Bypass Operation CIN Input capacitor 10µF Murata GRM219R61A106KE44D COUT Output capacitor 22µF Murata GRM21BR60J226ME39L L Inductor 3.3µH Coilcraft LPS3314 3R3 (1) See the Third-Party Products Disclaimer in the Device Support section. 8.2.2 Detailed Design Procedure The external components have to fulfill the needs of the application but also the stability criteria of the device's control loop. The TPS61291 is optimized to work within a range of L and C combinations. The LC output filter inductance and capacitance must be considered together. The output capacitor sets the corner frequency of the converter while the inductor creates a Right-Half-Plane-Zero degrading the stability of the converter. Consequently with a larger inductor a bigger capacitor has to be used to guarantee a stable loop. Table 2 shows the output filter component selection. Table 2. Recommended LC Output Filter Combinations Output capacitor value [µF](2) Output voltage Inductor value [µH](1) [V] 22 22 + 10 2 x 22 3.3 √(3) √ √ 3.3 / 3.0 4.7 √ 2.2 √ √ √ 2.5 3.3 √(3) √ (1) Inductor tolerance and current de-rating is anticipated. The effective inductance can vary by 20% and -30%. (2) Capacitance tolerance and bias voltage de-rating is anticipated. The effective capacitance can vary by 20% and -50%. (3) This LC combination is the standard value and recommended for most applications. 8.2.2.1 Inductor Selection The device is optimized to operate with a 3.3µH inductor value. Other inductor values can be used, per Table 2. The maximum inductor current can be approximated by the ILMAX, from Equation 1. For proper operation, the inductor needs to be rated for a saturation current which is higher than the switch current limit of typically 1A. Table 3 lists inductors that have been tested with the TPS61291. (1) Table 3. List of Inductors(1) INDUCTANCE DIMENSIONS [mm3] TYPE SUPPLIER 3.3 3.3 x 3.3 x 1.3 LPS3314 Coilcraft 3.3 2.95 x 2.95 x 1.4 LPS3015 3.3 3 x 2.5 x 1.5 VLF302515 TDK 3.3 2 x 2 x 1.2 MDMK2020T3R3M Taiyo Yuden 3.3 2.5 x 2.0 x 1.2 DFE252012 Toko 3.3 3.0 x 3.0 x 1.5 74438335033 Würth (1) See the Third-Party Products Disclaimer in the Device Support section. Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS61291 |
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