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TS3310 Datasheet(PDF) 16 Page - Silicon Laboratories |
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TS3310 Datasheet(HTML) 16 Page - Silicon Laboratories |
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16 / 20 page  TS3310 Page 19 TS3310 Rev. 1.1 The chosen inductor’s saturation current for a specific inductor value should be at least 50% greater than the peak inductor current value displayed in Figure 4, entitled ‘Inductor Current Handling Requirements’. Table 2 provides a list of some inductor manufacturers. Tables 4 and 5 show some example inductors for values of 10µH and 100µH that may be used for circuit A or B. The tables include the inductors’ Rdc (inductor series dc resistance or ESR), saturation current, and dimensions. As mentioned previously, the inductor’s saturation current should always be greater than 150% of the peak inductor current; therefore the appropriate size and efficiency (dependent upon ESR) may be chosen based on the application’s requirements. To guarantee maximum output power for 10µH and 22µH operation, a CLSW capacitor should be placed at the LSW pin to ground. Please refer to Table 3 for the recommended CLSW values. A ceramic capacitor with a NPO or COG dielectric is recommended for CLSW with a minimum voltage rating of 50V. Input and STORE Capacitor Selection Ceramic capacitors are recommended for CIN and CSTORE, due to ceramics’ extremely low leakage currents (generally limited by very high insulation resistance). Larger value ceramics (10µF or greater) may use high constant dielectric materials, such as X5R and X7R. These materials exhibit a strong voltage coefficient and exhibit substantially lower capacitance than rated when operated near the maximum specified voltage. For these types of capacitors, use a 10V or greater voltage rating. Inductor Value P/N Inductor Series Rdc Saturation Current (LxWxH) (mm) 10µH LQH32CN100K33 LQH 32C_33 0.3 Ω 450mA 3.2x2.5x2.0 10µH LQH32CN100K53 LQH 32C_53 0.3 Ω 450mA 3.2x2.5x1.55 10µH LQH43CN100K03 LQH 43C 0.24 Ω 650mA 4.5x3.6x2.6 100µH LQH32CN101K23 LQH 32C_23 3.5 Ω 100mA 3.2x2.5x2.0 100µH LQH32CN101K53 LQH 32C_53 3.5 Ω 100mA 3.2x2.5x1.55 100µH LQH43CN101K03 LQH 43C 2.2 Ω 190mA 4.5x3.6x2.8 Table 5. Murata Example Inductors Inductor Value P/N Inductor Type Rdc Saturation Current (LxWxH) (mm) 10µH CBC20166T100K CBC 2016 0.82 Ω 380mA 2x1.6x1.6 10µH CBC2518T100K CBC 2518 0.36 Ω 480mA 2.5x1.8x1.8 10µH CBC3225T100KR CBC 3225 0.133 Ω 900mA 3.2x2.5x2.5 100µH CB2016T101K CB 2016 4.5 Ω 70mA 2x1.6x1.6 100µH CB2518T101K CB 2518 2.1 Ω 60mA 2.5x1.8x1.8 100µH CBC2518T101K CBC 2518 3.7 Ω 160mA 2.5x1.8x1.8 100µH CBC3225T101KR CBC 3225 1.4 Ω 270mA 3.2x2.5x2.5 Table 4. Taiyo-Yuden Example Inductors Table 3. Recommended CLSW Values Inductor Value CLSW >22µH --- 22µH 100pF 10µH 220pF Inductors Taiyo Yuden www.t-yuden.com Murata www.murata.com Coilcraft www.coilcraft.com Sumida www.sumida.com Table 2. Inductor Manufacturers Figure 4. Inductor Peak Current vs Inductor Value Inductor Current Handling Requirement Inductor Value - µH 10 100 1000 1000 100 10 1 |
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