User’s Guide bq24020EVM and bq24023EVM 1-A Single-Chip Li-Ion and Li-Pol Charge Management IC with Autonomous USB-Port and AC-Adapter Supply Management Evaluation Module User’s Guide 1
EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use.
DYNAMIC WARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of VREG + 0.5 to 5.2 V and the output range of 0 V to 4.2 V. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power.
SLUU158 – April 2003 bq24020/bq24023 Charger (bqTINY-II) Evaluation Module Portable Power Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Test Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SLUU158 – April 2003 1.2 Performance Specification Summary Table 1. Performance Specification Summary(1) TEST CONDITIONS SPECIFICATION Input DC voltage, VI(DC) Battery charge current(1), IO(CHG) Power dissipation (1) 2 MIN VREG + 0.5 ICHG × (V(DC+) – V(BAT+)) TYP MAX UNIT 5.0 5.2 V 0.7 1.0 A 1.5 W This input voltage maximum is a function of the maximum allowable power dissipation on the device. The current level is programmed for 0.7 A.
SLUU158 – April 2003 2.2 Test Procedure Setup the evaluation board as described above, by making the necessary I/O connections and jumper selections. Prior to test and evaluation, it is important to verify that the maximum power dissipation on the device is not exceeded: PMAX = 1.5 W. P MAX + ǒV (DC)) * V (BAT))Ǔ (1) I (CHG) 1. Turn on the power supply, which is preset to 5.0 VDC, and 1.0 A for the current limit setting. 2.
SLUU158 – April 2003 2.3 Alternative Test Procedure The procedure in 2.3.1 describes a quick test to verify charging states without the need for a battery or expensive test equipment. 2.3.1 Equipment 1. Power source: current limited 5-V lab supply with its current limit set to 1.0 A ±0.1 A 2. Two fluke 75, equivalent or better 3. Load test board as shown in Figure 1. Power Supply 5.1 ±0.1 V ILIM 1.0 ±0.1 A + DC+ – DC– USB PLUG R2 120 Ω 0.25 W bq24020EVM bq24023EVM USB INPUT R3 120 Ω 0.
SLUU158 – April 2003 2.3.3 Procedure 1. Make sure the steps described in Section 2.3.2 Equipment Setup are followed (SW1 and SW3 are set to closed, and SW2 is set to off, shunts installed as shown in step 4, test board connected, and power source set to 5.1 V ±0.1 VDC). Turn on the power source. 2. Verify output voltage, BAT+, is between 2.5 VDC and 2.9 VDC and the red LED (D1) and green LEDs (D2) are illuminated. 3.
3 2 DC–, BAT–, and V– are tied together. 3 R6 and R7 are optional and protect the EVM from applying two different sources. 4 R4 and R5 are optional if a thermistor is used on the bq24020. 9 SLUU158 – April 2003 When using bq24023, pin 9 and J5–2 are TTE. Schematic Figure 2 shows the schematic diagram for the bq24020EVM, not bq24023EVM. Figure 2.
SLUU158 – April 2003 4 Physical Layouts Figure 3 shows the top layer of the EVM. Figure 4 shows the bottom layer. Figure 6 shows the top assemply view. Figure 3. bq24020EVM/bq24023EVM Top Layer Figure 4.
SLUU158 – April 2003 Figure 5.
SLUU158 – April 2003 5 List of Materials Table 4 lists the materials required for the bq24020EVM/bq24023EVM. Table 4. List of Materials REFERENCE DESIGNATOR bq24020 EVM bq24023 EVM C1, C2, C3 3 3 D1 1 1 D2, D3 2 J1, J8 J10 DESCRIPTION PART NUMBER SIZE MANUFAC Capacitor, ceramic, 1-µF, 16-V, X7R 805 Standard Standard Diode, LED, red, 1.8-V, 20-mA, 20-mcd 603 Liteon 160-1181-1-ND 2 Diode, LED, green, 2.
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.
