BQ21040EVM-777

User's Guide SLUUBF6 – April 2016 bq21040 0.8-A Single-Input, Single-Cell Li-Ion Battery Charger Evaluation Module This user’s guide describes the bq21040 evaluation module (EVM), how to perform a stand-alone evaluation or interface with a host or system. The charger is designed to deliver up to 800 mA of continuous current to the battery output when programmed with a resistor on the ISET pin and is programmed at the factory for approximately 540 mA. The charge status is indicated by the /CHG pin. 1 2 3 4 5 Contents Introduction ................................................................................................................... Considerations With Evaluating the bq21040 ............................................................................ Performance Specification Summary ..................................................................................... Test Summary ................................................................................................................ 4.1 Equipment ........................................................................................................... 4.2 Equipment and EVM Setup........................................................................................ 4.3 Test Procedure Using a Single Cell Li-Ion Battery ............................................................. 4.4 Alternate Test Methods ............................................................................................ Schematic, Physical Layouts and Bill of Materials ...................................................................... 5.1 Schematic ............................................................................................................ 5.2 Physical Layouts .................................................................................................... 5.3 Bill of Materials ...................................................................................................... 2 2 2 2 3 3 4 4 5 5 6 7 List of Figures 1 EVM Setup.................................................................................................................... 3 2 bq21040 EVM Board Schematic ........................................................................................... 5 3 Assembly Layer .............................................................................................................. 6 4 Top Layer ..................................................................................................................... 6 5 Bottom Layer ................................................................................................................. 6 SLUUBF6 – April 2016 Submit Documentation Feedback bq21040 0.8-A Single-Input, Single-Cell Li-Ion Battery Charger Evaluation Module Copyright © 2016, Texas Instruments Incorporated 1 Introduction 1 www.ti.com Introduction The bq21040 series of devices are highly integrated Li-ion linear charger devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The bq21040 has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10 hour safety timer. The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded. The charger power stage and charge current sense functions are fully integrated. The charger function has high-accuracy current and voltage regulation loops, charge status display, and charge termination. The pre-charge current and termination current threshold are set to 20% and 10% of the fast charge current internally on the bq21040. The fast charge current value is programmable via an external resistor. 2 Considerations With Evaluating the bq21040 Refer to the bq21040 data sheet (SLUSCE2) for specific details on the charger ICs. The ISET current control loop sets the maximum charge current. A system load may be connected to the OUT pin, which takes away some of the charge current. Normally it is not recommended to operate the device in pre-charge since the system load keeps the battery from recovering; but, since the precharge current is fixed to 20% of its fast charge current, this restriction is not necessary. 3 Performance Specification Summary Specification Test Conditions MIN Input DC voltage, Vin Recommended input voltage range Reduced Performance, Vin (1) Will not charge with Over Voltage input condition. Limited charging with under voltage input. Power Dissipation (2) PDISS = (VIN – VOUT) × IOUT IOUT RISET = 1 kΩ (1) (2) 4 TYP MAX UNIT 4.45 6.45 V 3.5 28 V 1.5 W 0.8 A 0.54 Input voltage range is specified for normal operation. Input voltage between UVLO and 4.75 V has limited functionality, but does not damage the IC nor present any safety issue with the battery. Input voltage above OVP and less than 30 Vdc has no operation and will not damage the IC. Lower input voltage (closer to dropout operation) produces less heat dissipation and potentially better performance. The junction temperature rise above ambient is proportional to the power dissipation. Once the junction temperature reaches approximately 125°C, thermal regulations reduces the programmed charge current. Test Summary The bq21040 EVM board requires a 5-VDC, 1-A power source to provide input power and a single-cell Liion or Li-polymer battery pack. The test setup connections and jumper setting selections are configured for a stand-alone evaluation; but, can be changed to interface with external hardware such as a microcontroller. 2 bq21040 0.8-A Single-Input, Single-Cell Li-Ion Battery Charger Evaluation Module Copyright © 2016, Texas Instruments Incorporated SLUUBF6 – April 2016 Submit Documentation Feedback Test Summary www.ti.com 4.1 Equipment • • • • 4.2 Power supply +5.1 ±0.1 V, current limit set to 1.5 ±0.1 A Battery: 4.2-V LiCoO2 or equivalent Three Fluke 75 DMMs (equivalent or better) Oscilloscope, model TDS220 (equivalent or better) Equipment and EVM Setup Jack or Component Connect or Adjustment To: J1 – VIN Power supply positive, preset to 5 VDC, 1-A current limit J2 – GND Power supply ground J3 – OUT Positive Battery Pack Terminal J4 – GND Negative Battery Pack Terminal J5 - TS No shunt JP1 No shunt JP2 Apply shunt for CHG LED connection, CHG = OUT JP3 Apply shunt for TS connection R2 (RISET) Adjust R2 for 1 kΩ between TP2 and GND R11 ( RTS) Adjust R11 for 10 kΩ between TP9 and GND TP1 TP3 J1 5.1 VDC VIN IN (DC +) CH1 GND (DC -) P/S #1 VIN OUT U1 6 J3 IN DNPC2 10µF C1 1µF TP7 GND 4 OUT 2 TS 1 CHG 3 VSS 5 ISET OUT TP6 C3 2.2µF TP5 TP4 J4 JP3 GND GND GND R1 680 DNPC4 10µF BQ21040DBV GND D2 Green TP8 J5 GND R2 TS R3 1.50k OUT (BAT +) GND (BAT -) GND GND Li-Ion Cell GND R6 1.00k 3 2 1 10k Ohm TP2 R4 10.0k GND GND JP1 R7 HIGH TS GND J2 GND C5 0.1µF 50k GND GND GND R5 OUT VIN 3 2 1 1.00k D1 5.6V OUT CHG VIN JP2 GND Dashed Line Represents EVM Board Figure 1. EVM Setup SLUUBF6 – April 2016 Submit Documentation Feedback bq21040 0.8-A Single-Input, Single-Cell Li-Ion Battery Charger Evaluation Module Copyright © 2016, Texas Instruments Incorporated 3 Test Summary 4.3 www.ti.com Test Procedure Using a Single Cell Li-Ion Battery 1. Verify that the setup is correct and turn on the power supply, which was preset to 5 VDC, and 1 A for the current-limit setting. 2. The bq21040 enters preconditioning mode if the battery is below the V(LOWV) threshold. In this mode, the bq21040 pre-charges the battery with a low current (internally set to 20% of fast charge) until the battery voltage reaches the V(LOWV) threshold or until the pre-charge timer expires. If the timer expires, then the charge current is terminated and the bq21040 enters fault mode. The CHG LED turns off when in timer fault mode. Toggling input power, toggling TS (BAT_EN) or battery replacement resets fault mode. 3. When the battery voltage rises above the V(LOWV) threshold, the battery enters fast-charge constant current mode. This EVM is programmed for 0.54 A of fast-charging current. 4. Once the battery reaches the voltage regulation threshold (4.2 V), the voltage control loop takes over and the current tapers down as the battery reaches its full capacity. 5. The battery remains at the fast-charge mode until either the charge timer expires or the charge termination current threshold is reached. 6. When the charge terminates, the CHG LED turns off. 7. Remove JMP3 (TS) and the charger turns on. This mode is Termination and Timer Disable Mode (TTDM). This allows continuous power applied from the input to the output, regulated to 4.2 V with a maximum current programmed by the ISET resistor. The system can operate without a battery in this mode as long as the system does not exceed the supplied input current. 8. If the battery discharges to the recharge threshold, the charger starts fast charging, but the CHG LED will not come on for the subsequent charges. Cycling the input power, replacing the battery, or toggling the TS pin low starts a new charge with the CHG LED on. 9. Install the jumper on JP3 (TS) adjust R7 until VTS (voltage between TPS and GND) is around 1.23 V. Charging should be suspended. Reduce voltage on TS pin by adjust R7 until charging resumes. Further reduce the voltage on TS until VTS is around 278 mV and charging should be suspended. NOTE: Loads across the battery can affect termination. The pre-term pin can be adjusted to offset the system current. See data sheet for more details. 4.4 Alternate Test Methods A 4-quadrant power supply that can source and sink current can be used in place of the battery pack to evaluate the charger. It allows each transfer between pre-charge, constant-current and constant voltage fast charge. Keep leads short to avoid adding too much inductance which may cause an interaction between the power supply and charger. A large capacitor across the output helps cancel the inductance if long leads are necessary. 4 bq21040 0.8-A Single-Input, Single-Cell Li-Ion Battery Charger Evaluation Module Copyright © 2016, Texas Instruments Incorporated SLUUBF6 – April 2016 Submit Documentation Feedback Schematic, Physical Layouts and Bill of Materials www.ti.com 5 Schematic, Physical Layouts and Bill of Materials 5.1 Schematic Figure 2 illustrates the EVM schematic. TP1 TP3 J1 VIN VIN 6 J2 TP2 OUT U1 J3 IN DNPC2 10µF C1 1µF TP7 4 2 TS 1 CHG 3 VSS 5 ISET GND GND OUT OUT TP6 C3 2.2µF TP5 J4 GND GND BQ21040DBV GND D2 Green TP8 GND TP4 JP3 GND R1 680 DNPC4 10µF J5 GND R2 TS R3 1.50k R4 10.0k GND JP1 R7 HIGH TS GND GND GND R6 1.00k 3 2 1 10k Ohm GND C5 0.1µF 50k GND GND GND R5 OUT VIN 3 2 1 1.00k D1 5.6V OUT CHG VIN JP2 GND Figure 2. bq21040 EVM Board Schematic SLUUBF6 – April 2016 Submit Documentation Feedback bq21040 0.8-A Single-Input, Single-Cell Li-Ion Battery Charger Evaluation Module Copyright © 2016, Texas Instruments Incorporated 5 Schematic, Physical Layouts and Bill of Materials 5.2 www.ti.com Physical Layouts Figure 3 through Figure 5 illustrate the EVM PCB layouts. Figure 3. Assembly Layer Figure 4. Top Layer Figure 5. Bottom Layer 6 bq21040 0.8-A Single-Input, Single-Cell Li-Ion Battery Charger Evaluation Module Copyright © 2016, Texas Instruments Incorporated SLUUBF6 – April 2016 Submit Documentation Feedback Schematic, Physical Layouts and Bill of Materials www.ti.com 5.3 Bill of Materials Table 1 lists the EVM BOM. Table 1. bq21040EVM Bill of Materials Designator Qty Value Description PackageReference PartNumber Manufacturer Alternate PartNumber Alternate Manufacturer !PCB 1 C1 1 1uF CAP, CERM, 1 µF, 25 V, +/- 10%, X5R, 0603 0603 PWR777 Any - - C1608X5R1E105K080AC TDK C3 1 2.2uF CAP, CERM, 2.2 µF, 10 V, +/- 10%, X7R, 0603 C5 1 0.1uF CAP, CERM, 0.1uF, 50V, +/-10%, X7R, 0603 0603 GRM188R71A225KE15D Murata 0603 GCM188R71H104KA57B D1 1 5.6V Murata Diode, Zener, 5.6 V, 225 mW, SOT-23 SOT-23 BZX84C5V6LT1G D2 1 Green ON Semiconductor LED, Green, SMD 1.6x0.8x0.8mm LTST-C190GKT J1, J2, J3, J4, J5, JP3 Lite-On 6 Header, 100mil, 2x1, Tin plated, TH Header, 2 PIN, 100mil, Tin PEC02SAAN Sullins Connector Solutions JP1, JP2 2 Header, 100mil, 3x1, Tin plated, TH Header, 3 PIN, 100mil, Tin PEC03SAAN Sullins Connector Solutions R1 1 680 RES, 680, 5%, 0.1 W, 0603 0603 CRCW0603680RJNEA Vishay-Dale R2 1 10k Ohm Trimmer, 10k ohm, 0.25W, TH 4.5x8x6.7mm 3266W-1-103LF Bourns R3 1 1.50k RES, 1.50k ohm, 1%, 0.1W, 0603 0603 CRCW06031K50FKEA Vishay-Dale Equivalent Any R4 1 10.0k RES, 10.0 k, 0.1%, 0.1 W, 0603 0603 RT0603BRD0710KL Yageo America R5, R6 2 1.00k RES, 1.00 k, 1%, 0.1 W, 0603 0603 CRCW06031K00FKEA Vishay-Dale R7 1 50k Trimmer, 50k ohm, 0.25W, TH 4.5x8x6.7mm 3266W-1-503LF Bourns SH-JP1, SH-JP2, SH-JP3 3 1x2 Shunt, 100mil, Gold plated, Black Shunt 969102-0000-DA 3M SNT-100-BK-G Samtec TP1 1 Red Test Point, Miniature, Red, TH Red Miniature Testpoint 5000 Keystone TP2, TP4, TP8 3 Black Test Point, Miniature, Black, TH Black Miniature Testpoint 5001 Keystone TP3 1 Yellow Test Point, Miniature, Yellow, TH Yellow Miniature Testpoint 5004 Keystone TP5, TP6, TP7 3 White Test Point, Miniature, White, TH White Miniature Testpoint 5002 Keystone U1 1 Single-Input, Low Cost Single Cell Li-Ion and Li-Pol Battery Charger, DBV0006A DBV0006A BQ21040DBV Texas Instruments C2, C4 0 CAP, CERM, 10 µF, 25 V, +/- 10%, X5R, 0805 0805 C2012X5R1E106K125AB TDK FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy or mount. Fiducial N/A N/A Printed Circuit Board 10uF Notes: SLUUBF6 – April 2016 Submit Documentation Feedback Texas Instruments Unless otherwise noted in the Alternate Part Number and/or Alternate Manufacturer columns, all parts may be substituted with equivalents. bq21040 0.8-A Single-Input, Single-Cell Li-Ion Battery Charger Evaluation Module Copyright © 2016, Texas Instruments Incorporated 7 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. 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