User’s Guide bq24022EVM 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.
SLUU156 – April 2003 bq24022 (bqTINY-II) Evaluation Module Portable Power Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Test Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SLUU156 – April 2003 1.2 Performance Specification Summary Table 1. Performance Specification Summary(1) TEST CONDITIONS SPECIFICATION MIN Input DC voltage, VI(DC) Battery charge current(1), IO(CHG) Power dissipation (1) 2 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.
SLUU156 – 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.
SLUU156 – April 2003 2.3 Alternative Test Procedure Below is a test procedure to verify charging states without the need for a battery or expensive test equipment. 2.3.1 Equipment The procedure used to evaluate the EVM operation and the basic functions of the device is as follows: 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.
SLUU156 – 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 listed in step 4, test board connected, and power source set to 5.1 V ± 0.1 VDC). Turn on the power source. 2. Verify that output voltage, BAT+, is between 2.5 VDC and 2.9 VDC and the red LED (D1) and green LEDs (D2 and D3) are illuminated. 3.
3 2 R7 is optional and protects the EVM from applying two different sources. 3 R4 and R5 are optional if a thermistor is used 9 SLUU156 – April 2003 DC–, BAT–, and V– are tied together. Schematic Figure 2 shows the schematic diagram for the bq24022EVM. Figure 2.
SLUU156 – 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. bq24022EVM Top Layer Figure 4.
SLUU156 – April 2003 Figure 5.
SLUU156 – April 2003 5 List of Materials Table 4 lists the materials required for the bq24022EVM. Table 4. List of Materials REFERENCE DESIGNATOR COUNT DESCRIPTION SIZE MANUFAC PART NUMBER C1, C2, C3 3 Capacitor, ceramic, 1-µF, 16-V, X7R 805 Standard Standard D1 1 Diode, LED, red, 1.8-V, 20-mA, 20-mcd 603 Liteon 160–1181–1–ND D2, D3 2 Diode, LED, green, 2.1-V, 20-mA, 6-mcd 603 Liteon 160–1183–1–ND J1, J8 2 Terminal block, 2-pin, 6-A, 3.5-mm 0.27 x 0.
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