Using the bq2412x (bqSWITCHER™) EVM User's Guide Literature Number: SLUU236A March 2006 – Revised November 2007
SLUU236A – March 2006 – Revised November 2007 Submit Documentation Feedback
Contents 1 2 Introduction................................................................................................................ 5 1.1 Background ....................................................................................................... 5 1.2 Performance Specification Summary .......................................................................... 5 Test Summary ............................................................................................................ 6 2.
List of Figures 1 2 3 4 5 bq2412x bq2412x bq2412x bq2412x bq2412x Schematic ......................................................................................................... 8 EVM Top Assembly ............................................................................................. 9 EVM Top Silk Screen .......................................................................................... 10 EVM Top Layer .....................................................................................
User's Guide SLUU236A – March 2006 – Revised November 2007 Using the bq2412x (bqSWITCHER™) EVM 1 Introduction This user's guide describes the bq2412x (bqSWITCHER™) evaluation module (EVM) for part numbers bq24120, bq24123, and bq24125. The EVM helps you evaluate the performance of a charge management solution for portable applications using the bq24120x product family. A complete, designed, and tested charger is presented.
www.ti.com Test Summary 2 Test Summary This section covers the test setups and tests performed in evaluating the EVM. 2.1 Equipment • • 2.2 Power Source: Current-limited, 15-V laboratory power supply with its current limit set to 25% above the programmed charging current (1.7 A for setup from factory). This is basically a safety limit. The actual DC input current should be less than the charging current.
www.ti.com Test Summary 3. The bq2412x enters preconditioning mode if the battery is below the V(LOWV) threshold. In this mode, the bq2412x precharges the battery with a low current programmed by the ISET2 pin. If the RSET1 and RSET2 resistors are the same value, then the precharge is 1/10th the fast-charge current (IPRE-CHG = 1.33 A/10 = 133 mA) until the battery voltage reaches the V(LOWV) threshold or until the precharge timer expires.
www.ti.com Schematic 3 Schematic Figure 1 shows the schematic diagram for the EVM. Figure 1.
www.ti.com Physical Layouts 4 Physical Layouts This section contains the board layout and assembly drawings for the EVM. 4.1 Board Layout The EVM top assembly and the top silk screen views are shown by Figure 2 and Figure 3, respectively. Figure 4 and Figure 5 show the top layer and the bottom layer views, respectively. Figure 2.
www.ti.com Physical Layouts Figure 3. bq2412x EVM Top Silk Screen Figure 4.
www.ti.com Physical Layouts Figure 5.
www.ti.com List of Materials 5 List of Materials Table 3 through Table 5 lists the components used in this design. With minor component adjustments, this design could be modified to meet a wide range of applications. Table 3.
www.ti.com List of Materials Table 4. bq24123EVM-002 List of Materials (1) REFERENCE DESIGNATOR QTY DESCRIPTION (2) SIZE MFR PART NUMBER C1, C2, C4 3 Capacitor, ceramic, 10 µF, 25 V, X5R, 20% 1206 Panasonic ECJ-3YB1E106M C9 0 Capacitor, ceramic, 10 µF, 25 V, X5R, 20% 1206 Panasonic ECJ-3YB1E106M C3 0 Capacitor, ceramic, 0.1 µF, 16 V, X7R, 10% 603 Panasonic ECJ-1VB1C104K C5, C7, C8 3 Capacitor, ceramic, 0.
www.ti.com References Table 5. bq24125EVM-003 List of Materials (1) REFERENCE QTY DESIGNATOR SIZE MFR PART NUMBER C1, C2, C4 3 Capacitor, ceramic, 10 µF, 25 V, X5R, 20% 1206 Panasonic ECJ-3YB1E106M C9 0 Capacitor, ceramic, 10 µF, 25 V, X5R, 20% 1206 Panasonic ECJ-3YB1E106M C3 1 Capacitor, ceramic, 0.1 µF, 16 V, X7R, 10% 603 Panasonic ECJ-1VB1C104K C5, C7, C8 3 Capacitor, ceramic, 0.1 µF, 16 V, X7R, 10% 603 Panasonic ECJ-1VB1C104K C6 1 Capacitor, ceramic, 0.
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