User’s Guide July 2002 Advanced Analog Products SLUU083A
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Trademarks Preface Read This First About This Manual This user’s guide describes the bq2400x evaluation module. The EVM conveniently evaluates a linear Li-ion bq2400x charge-management solution for one- and two-cell battery-pack applications. This guide describes a complete designed-and-tested charger, which delivers up to 1.
Running Title—Attribute Reference Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2 Performance Specification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 2 Test Summary . . . . . . . . . .
Chapter 1 Introduction This user’s guide describes the bq2400x Evaluation Module (SLUP051). The EVM conveniently evaluates a linear Li-ion bq2400x charge-management solution for one- and two-cell battery-pack applications. This guide describes a complete designed-and-tested charger, which delivers up to 1.0 A of continuous-charge current for one- or two-cell applications. Topic Page 1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Background 1.1 Background The bq2400x series ICs are advanced Li-Ion linear charge management devices for highly integrated and space-limited applications. They combine high-accuracy current and voltage regulation; FET pass-transistor and reverse-blocking Schottky; battery conditioning, temperature, or input-power monitoring; charge termination; charge-status indication; and charge timer in a small, 20-lead TSSOP PowerPAD package.
Performance Specification Summary Table 1–2. Performance Specification Summary (Two Cell) Specification Test Conditions Input dc voltage, VDC Battery charge current, current ICHG Battery voltage regulation, regulation VREG Therm fault Min Typ Max Units 9.1 9.5 † J4 shorted, J3 open 0.4 0.5 0.6 J3 shorted, J4 open 0.9 1 1.1 J6 set to VCC 8.35 8.40 8.45 J6 set to GND 8.15 8.20 8.
Chapter 2 Test Summary This chapter shows the test setups used, and the tests performed, in designing the bq2400xEVM. Topic Page 2.1 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.2 Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setup 2.1 Setup The bq2400X EVM board requires a DC power source to provide input power and a single-cell lithium-ion or lithium-polymer battery to charge. Note: Other versions of the bq2400x IC can charge two-cell battery packs. The test setup connections and jumper setting selections are listed below. 2.1.1 2.1.
Test Procedures Note: VI for a single cell should not exceed 5.3 VDC for the 1-A charge rate and 7.6 V for the .5-A charge rate. Adjust the input power supply for 5 V. The red LED should illuminate to indicate charging, unless there is a fault or the battery is fully charged. The bq2400x enters preconditioning mode if the battery is below the LowV threshold. In this mode, the bq2400x trickle-charges with approximately 65 mA for approximately 23 minutes.
Test Procedures The bq2400x enters preconditioning mode if the battery is below the LowV threshold. In this mode, the bq2400x trickle-charges with approximately 65 mA for approximately 23 minutes. If the battery does not reach the LowV threshold after this period, then the charge current is terminated and the bq2400x enters fault mode. The red LED flashes in fault mode. This feature is tested in the 0.5-A charge mode by using a 10-Ω, 5-W resistor in place of the battery.
Chapter 3 Physical Layouts This chapter contains the board layout and assembly drawings for the SLUP051 EVM. Topic 3.1 Page Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Board Layout 3.1 Board Layout Figure 3-1 shows the top layer of the SLUP051. Figure 3-2 shows the bottom layer. Figure 3-3 shows the SLUP051 top assembly view. Figure 3–1.
Board Layout Figure 3–2. SLUP051 Board Layout Bottom Layer Figure 3–3.
Chapter 4 Bill of Materials This chapter contains the bill of materials required for the SLUP051 EVM. It also specifies the charge status configurations for the bq2400x. Topic Page 4.1 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4.2 bq2400x Charge Status Configurations . . . . . . . . . . . . . . . . . . . . . . . . .
Bill of Materials 4.1 Bill of Materials Table 4-1 lists materials required for the SLUP051 EVM. Table 4–1. SLUP051 Bill of Materials Qty Reference Designator Part Number Description MFG Size 2 C1, C4 TAJC106M016R Capacitor, 10 µF tantalum, 16 V, ±20%, 6032 AVX-Future 1210 1 C2 C0805X7R250-104KNE Capacitor, 0.1 µF ceramic, X7R, 25 V, ±10%, 805 Venkel 805 1 C3 ECJ-2YB1E224K Capacitor, 0.
bq2400x Charge Status Configurations 4.2 bq2400x Charge Status Configurations Table 4–2 lists the charge status configurations for the bq2400x. Table 4–2.
Appendix A Schematic This chapter contains the schematic diagram for the EVM. Topic A.1 Page Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 3 2 1 REVISIONS DESCRIPTION LTR ZONE DATE APPROVED X X B D D VCC U1 R8 R6 511 5% 511 5% BQ24000 3 0.1 A2 2 4 B2 J4 A1 1 3 B1 R4 C2 0.1UF A2 2 N/C N/C IN OUT IN OUT 4 B2 5 ISNS 16 AGND 6 15 STAT2 N/C EN JUMPER 4.2V 2 1 16V GRN 3 J8 RED D2 C C D1 STAT 2 JUMPER 1 C5 12 CR C3 21 22 N/C 23 PBKG 10PF 11 6 Hr 0.
