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User’s Guide
July 2002 Advanced Analog Products
SLUU083A
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the t
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Trademarks Preface Read This First About This Manual This user’s guide describes the bq2400x evaluation module. The EVM conve- niently 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 1.2 A of continuous-charge current for one- or two-cell applications How to Use This Manual This document contains the following chapters: Chapter 1—Introduction Chapte
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Running Title—Attribute Reference Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2 Performance Specification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 2 Test Summary . . . . . .
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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 continu- ous-charge current for one- or two-cell applications. Topic Page 1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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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. The bq2400x continuously measures battery temperature using an ex
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Performance Specification Summary Table 1–2.Performance Specification Summary (Two Cell) Specification Test Conditions Min Typ Max Units Input dc voltage, V 9.1 9.5 † V DC J4 shorted, J3 open 0.4 0.5 0.6 B Battery attery c charge harge current, current II A A CHG CHG J3 shorted, J4 open 0.9 1 1.1 J6 set to V 8.35 8.40 8.45 CC Battery Battery vo voltage ltage regu regulation lation, V V V V REG REG J6 set to GND 8.15 8.20 8.25 High, T J2 set to Therm 43 48 53 BATMAX Therm Therm ffault ault ° °C C
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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Test Summary 2-1
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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 I/O Connections Jack Connect to: J1–VCC Power source positive output J1–GND Power source negative output J9–+ Positive lead of single lithium cell J9– – Negative lead of single lithium cell
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Test Procedures Note: V for a single cell should not exceed 5.3 VDC for the 1-A charge rate and I 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. If the battery does not reach the LowV t
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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. Fault mode is reset by
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Chapter 3 Physical Layouts This chapter contains the board layout and assembly drawings for the SLUP051 EVM. Topic Page 3.1 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Physical Layouts 3-1
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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. SLUP051 Board Layout Top Layer 3-2
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Board Layout Figure 3–2. SLUP051 Board Layout Bottom Layer Figure 3–3. SLUP051 Top Assembly View Physical Layouts 3-3
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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 . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 Bill of Materials 4-1
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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 Reference Qty Designator Part Number Description MFG Size 2 C1, C4 TAJC106M016R Capacitor, 10 µ F tantalum, 16 V, ±20%, AVX-Future 1210 6032 1 C2 C0805X7R250-104KNE Capacitor, 0.1 µ F ceramic, X7R, 25 V, Venkel 805 ±10%, 805 1 C3 ECJ-2YB1E224K Capacitor, 0.22 µ F ceramic, X7R, 25 V, Panasonic 805 ±10%, 0805 1 C5 ECJ-2VCH100F Capacitor, 10 pF ceramic, NPO, 50 V, Pana
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bq2400x Charge Status Configurations 4.2 bq2400x Charge Status Configurations Table 4–2 lists the charge status configurations for the bq2400x. Table 4–2.Charge Status Configurations Part Number Number of Cells Charge Status Configuration bq24001 Single cell Single LED bq24002 Single cell 2 LED bq24003 Single cell Bicolor LED bq24004 Two cell Single LED bq24005 Two cell 2 LED bq24006 Two cell Bicolor LED bq24007 Single cell Single LED bq24008 Single cell Bicolor LED Bill of Materials 4-3
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Appendix A Schematic This chapter contains the schematic diagram for the EVM. Topic Page A.1 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2 Schematic A-1
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26 27 28 29 30 4 3 2 1 REVISIONS LTR ZONE DESCRIPTION DATE APPROVED B X X D D VCC R8 R6 511 511 5% 5% U1 BQ24000 VCC R9 C C 1 20 J3 J9 N/C N/C R3 100 A1 1 3 B1 2 19 1 A A IN OUT C4 3 18 2 0.1 IN OUT GRN RED A2 2 4 B2 4 17 10UF 16V 3 D2 D1 VCC VSENS J8 C C 5 16 ISNS AGND STAT 2 JUMPER J4 R4 C2 A1 1 3 B1 6 15 1 2 N/C STAT2 0.1UF 7 14 0.2 APG/THM STAT1 A2 2 4 B2 8 13 EN TMR_SEL VCC C5 9 12 10PF VSEL CR (NO JUMPER) 10 11 PBKG N/C 3 Hr 2 ON OFF 2 C3 1 3 6 Hr 4.5 Hr J1 0.22UF 1 C1 3 J5 10UF J7 1 EN JU
