User's Guide SLUU365 – June 2009 bq2435x DSG EVM for Li-Ion Charger Front-End Protection IC This user's guide describes the features, setup, and operation of the bq2435xEVM evaluation module. Included are the bill of materials, board layout, and schematic. 1 2 3 4 Contents Introduction ................................................................................................................... 2 1.1 General Description ................................................................................................ 2 1.2 EVM Features ....................................................................................................... 2 1.3 I/O Description ...................................................................................................... 2 1.4 Controls and Key Parameters Setting............................................................................ 2 1.5 Recommended Operating Conditions ............................................................................ 3 Test Summary ................................................................................................................ 3 2.1 Definitions ............................................................................................................ 3 2.2 Equipment ........................................................................................................... 3 2.3 Equipment Setup.................................................................................................... 4 2.4 Procedure ............................................................................................................ 5 PCB Layout Guideline ....................................................................................................... 6 Bill of Materials, Board Layout, and Schematic .......................................................................... 6 4.1 Bill of Materials ...................................................................................................... 6 4.2 Board Layout ........................................................................................................ 7 4.3 Schematic .......................................................................................................... 10 List of Figures 1 2 3 4 5 6 Original Test Setup for HPA398 (bq2435x DSG EVM) ................................................................. 5 Top Layer ..................................................................................................................... 7 Bottom Layer ................................................................................................................. 8 Top Silk Screen .............................................................................................................. 8 Top Assembly ................................................................................................................ 9 bq243550 Schematic ...................................................................................................... 10 List of Tables 1 Bill of Materials ............................................................................................................... 6 SLUU365 – June 2009 Submit Documentation Feedback bq2435x DSG EVM for Li-Ion Charger Front-End Protection IC 1 Introduction www.ti.com 1 Introduction 1.1 General Description The bq2435x evaluation module (EVM) is a complete charger module for evaluating a charger front-end protection and charger solution using the bq2435x and bq2057C devices. It is designed to deliver up to 560 mA of charge current to Li-ion or Li-polymer applications. The charger front-end protection current is designed to 1.2 A. The bq2435x protects the charging system against three types of failures: input overvoltage when the ac adapter fails to regulate its voltage, load overcurrent when failures such as a short circuit occur in the charging system, and battery overcharge. For details, see the bq2435x data sheet (SLUS943). 1.2 EVM Features • • • • • • • • • • 1.3 1.4 I/O Description Jack Description J1–DC+ AC adapter, positive output J1–DC– AC adapter, negative output, ground J2–FAULT bq24355 FAULT pin J2–VBAT bq2435x VBAT pin J2–GATDRV bq2435x GATDRV pin J2–CHGIN bq2435x CHGIN pin J3–BATEN bq24355 BATEN pin J3–OUT bq2435x OUT pin J3–BAT+ Battery positive output J3–GND Ground J4–BAT+ Connect to battery positive output J4–BAT– Connect to battery negative output, ground Controls and Key Parameters Setting Jack (1) Description Factory Setting JP1 If on, high-side current sensing resistor is disabled Jumper on JP2 bq24355 BATEN pin logic input, pull low to enable Jumper (BATEN, GND) on JP3 bq2435x GATDRV pin Jumper off JP4 bq2057C BAT pin connection to bq2435x Jumper on (1) 2 Evaluation module for bq2435x DSG Evaluation module for bq2057C charger integrated circuit (IC) Input operating range for bq2435x 4.5 V–26 V Input operating range for bq24080 4.5 V–6.5 V Input overvoltage protection. Input overcurrent protection. Battery overvoltage protection. LED Indication for status signals. Test points for key signals available for testing purpose. Easy probe hook-up Jumpers available. Easy to change connections Short JP1, JP4, JP5, and JP6, and disconnect JP7 to use on board bq2057C as charger; to use external charger to control bq2435x, disconnect JP1, JP4, JP5, and JP6 and short JP7. bq2435x DSG EVM for Li-Ion Charger Front-End Protection IC SLUU365 – June 2009 Submit Documentation Feedback Test Summary www.ti.com 1.5 Jack (1) Description Factory Setting JP5 bq2057C VCC pin connection to bq2435x Jumper on JP6 bq2057C CC pin connection to bq2435x Jumper on JP7 If on, low-side current sensing resistor is disabled Jumper off Recommended Operating Conditions Symbol Description Minim um Supply voltage, VIN Input voltage from ac adapter input Battery voltage, VBAT Voltage applied at VBAT terminal of J4 Supply current, IAC Maximum input current from ac adapter input 0 Charge current, Ichrg Battery charge current Test Summary 2.1 Definitions Maxim um Unit 4.5 5 26 V 0 3–4.2 5 V 1.5 A 0.05 Operating junction temperature range, TJ 2 Typical 0.56 0 1 A 125 °C This procedure details how to configure the evaluation board. On the test procedure, the following naming conventions are followed. See the schematic for details. VXXX External voltage supply name (VIN, VBAT, VOUT) LOADW: External load name (LOADR, LOADI) V(TPyyy) : Voltage at internal test point TPyyy. For example, V(TP1) means the voltage at TP1. V(Jxx): Voltage at jack terminal Jxx. V(TP(XXXXX)): Voltage at test point “XXXXX”. For example, V(ACDET) means the voltage at the test point which is marked as “ACDET”. V(XXX, YYY): Voltage across point XXX and YYY. I(JXX(YYY)): Current going out from the YYY terminal of jack XX. Jxx(BBB): Terminal or pin BBB of jack xx Jxx ON : Internal jumper Jxx terminals are shorted Jxx OFF: Internal jumper Jxx terminals are open Jxx (-YY-) ON: Internal jumper Jxx adjacent terminals marked as “YY” are shorted Measure:→ A,B Check specified parameters A, B. If measured values are not within specified limits the unit under test has failed. Observe → A,B Observe if A, B occur. If they do not occur, the unit under test has failed. Assembly drawings have location for jumpers, test points and individual components 2.2 2.2.1 Equipment Power Supplies Power Supply 1 (PS 1): a power supply capable of supplying 10 V at 2 A is required. SLUU365 – June 2009 Submit Documentation Feedback bq2435x DSG EVM for Li-Ion Charger Front-End Protection IC 3 Test Summary 2.2.2 www.ti.com Load 1 A 10-V (or above), 2-A (or above) electronic load that can operate at constant current mode. 2.2.3 Load 2 A 10-V (or above), 2-A (or above) electronic load that can operate at constant voltage mode. 2.2.4 Meters Four Fluke 75 multimeters (equivalent or better) Or: Three equivalent voltage meters and one equivalent current meter The current meter must be capable of measuring 2-A+ current. 2.2.5 Wire Gauge All wires connected to the EVM input power supply and output load must use at least AWG 22. The maximum current is up to 1 A. 2.3 Equipment Setup 1. 2. 3. 4. 5. 6. 7. 8. Set the PS 1 for 0 V ±100 mVdc, 2 ± 0.1 A current limit, and then disable the output. Connect the output of PS 1 to J1 (DC+, DC–). Connect a voltage meter across J1 (DC+, DC–). Connect the output of the Load 1 in series with a current meter (multimeter) to J2 (CHGIN) and J3 (GND). Turn on the power of the Load 1. Set the load current to 1.5 A ±50 mA but disable the output. Connect output of the Load 2 in series with a current meter (multimeter) to J4 (BAT+, BAT–). Connect a voltage meter across J4 (BAT+, BAT–). Set the voltage of Load 2 to 3.6 V ±0.1 V, and disable output of Load 2. JP1: ON, JP2 (BATEN, GND): ON, JP3: OFF, JP4: ON, JP5: ON, JP6: ON, JP7: OFF. After the preceding steps have been taken, the test setup for HPA398 (bq2435x DSG EVM) appears as is shown in Figure 1. 4 bq2435x DSG EVM for Li-Ion Charger Front-End Protection IC SLUU365 – June 2009 Submit Documentation Feedback Test Summary www.ti.com HPA398 bq2435xEVM JP7 J1 Power Supply 1 V J4 JP1 BAT- DCDC+ V BAT+ U1 Ibat CFET APPLICATION CIRCUIT I Load 2 JP6 JP5 JP4 JP3 JP2 FAULT VBAT GATDRV CHGIN BATEN OUT BAT+ GND U2 J2 J3 I I Load 1 Figure 1. Original Test Setup for HPA398 (bq2435x DSG EVM) 2.4 Procedure 2.4.1 1. 2. 3. 4. Charger Current and Voltage Regulation Ensure that steps in Section 2.3 are followed. Enable output of PS 1. Increase the output voltage of PS 1 to 5 V ±0.1 V. Enable output of Load 2. Measure → V(J2(OUT)) = 3.6 V ±200 mV Measure → Ibat = 560 mA ±70 mA Observe → D2 on, D3 on, D6 off, D7 on. 2.4.2 CFET Input Overvoltage Protection 1. Increase the voltage of PS 1 to 8 V ±0.1 V. Observe → D2 on, D3 off, D6 off, D7 off. 2. Decrease the voltage of PS 1 to 5 V ±0.1 V. Observe → D2 on, D3 on, D6off, D7 on. 2.4.3 CFET Load Overcurrent Protection 1. Enable the output of the Load 1. Observe → D2 on, D3 off, D6 off, D7 off. 2. Disable the output of the Load 1. Observe → D2 on, D3 on, D6 off, D7 on. 3. Decrease the voltage of PS 1 to 0 V ±0.1 V. SLUU365 – June 2009 Submit Documentation Feedback bq2435x DSG EVM for Li-Ion Charger Front-End Protection IC 5 PCB Layout Guideline 3 www.ti.com PCB Layout Guideline 1. It is critical that the exposed power pad on the backside of the bq2435x package be soldered to the printed-circuit board (PCB) ground. Ensure that sufficient thermal vias are located underneath the IC, connecting to the ground plane on the other layers. 2. The high-current charge paths into ACIN and from CHGIN, OUT pins must be sized appropriately for the maximum charge current in order to avoid voltage drops in these traces. 3. Decoupling capacitors for ACIN, CHGIN must be placed and make the interconnections to the IC as short as possible. 4. Resistors for VBAT pin must be placed close to the corresponding IC pins and make the interconnections to the IC as short as possible. 4 Bill of Materials, Board Layout, and Schematic 4.1 Bill of Materials Table 1. Bill of Materials 6 bq24350 -001 bq24352 002 bq24355 003 RefDes Value Description Size Part Number MFR 1 1 1 C1 1uF Capacitor, Ceramic, 35V, X5R, 10% 603 Std Std 3 3 3 C2, C3, C5 1uF Capacitor, Ceramic, 10V, X7R, 10% 603 Std Std 1 1 1 C4 0.1uF Capacitor, Ceramic, 16V, X7R, 10% 805 Std Std 1 1 1 C6 0.1uF Capacitor, Ceramic, 10V, X7R, 10% 603 Std Std 1 1 1 C7 220uF Capacitor, Electrolytic, 25V, 20% 0.327 X 0.327 inch UUD1E221MNL1GS Nichicon 1 1 1 D1 BZT52C6V8S Diode, Zener, 200mW, 6.8V SOD-323 BZT52C6V8S General 3 3 3 D2, D3, D6 Green Diode, LED, Green, 2.1-V, 20-mA, 6-mcd 603 LTST-C190GKT Lite On 2 2 2 D4, D7 Red Diode, LED, Red, 2.1-V, 20-mA, 6-mcd 603 LTST-C190CKT Lite On 1 1 1 D5 BAT54C Diode, Dual Schottky, 200-mA, 30-V SOT23 BAT54C VishayLiteon 2 2 2 J1, J4 ED1514/2DS Terminal Block, 2-pin, 6-A, 3.5mm 0.27 x 0.25 inch ED1514/2DS OST 2 2 2 J2, J3 ED1516/4DS Terminal Block, 4-pin, 6-A, 3.5mm 0.55 x 0.25 inch ED1516/4DS OST 5 5 5 JP1, JP4, JP5, JP6, JP7 PEC02SAAN Header, 2-pin, 100mil spacing 0.100 inch x 2 PEC02SAAN Sullins 2 2 2 JP2, JP3 PTC03SAAN Header, Male 3-pin, 100mil spacing, (36-pin strip) 0.100 inch x 3 PTC03SAAN Sullins 5 5 5 JP1, JP2, JP4, JP5, JP6 929950-00 Shorting jumpers, 2-pin, 100mil spacing, 929950-00 3M/ESD 2 2 0 R1, R2 0 Resistor, Chip, 1/16W, 1% 402 Std Std 0 0 2 R3, R4 0 Resistor, Chip, 1/16W, 1% 402 Std Std 2 2 2 R5, R6 200k Resistor, Chip, 1/16W, 5% 402 Std Std 2 2 2 R7, R8 200k Resistor, Chip, 1/16-W, 5% 603 Std Std 2 2 2 R9, R10 0.2 Resistor, Metal Film, 1/4 watt, 1206 1% Std Std 1 1 1 R11 20k Resistor, Chip, 1/16-W, 5% 603 Std Std 1 1 1 R12 1k Resistor, Chip, 1/16-W, 5% 603 Std Std 1 1 1 R13 100 Resistor, Chip, 1/16-W, 5% 603 Std Std 1 1 1 R14 6.2k Resistor, Chip, 1/16-W, 5% 603 Std Std 4 4 4 R15, R16, R17, R18 1.5k Resistor, Chip, 1/16-W, 5% 603 Std Std bq2435x DSG EVM for Li-Ion Charger Front-End Protection IC SLUU365 – June 2009 Submit Documentation Feedback Bill of Materials, Board Layout, and Schematic www.ti.com Table 1. Bill of Materials (continued) bq24350 -001 bq24352 002 bq24355 003 RefDes Value Description Size Part Number MFR 1 1 1 R19 51 Resistor, Chip, 1/16-W, 5% 603 Std Std 4 4 4 6-32 NYL nuts NY HN 632 H620-ND Building Fasteners 4 4 4 ST1,ST2,S T3,ST4 4816 STANDOFF M/F HEX 6-32 NYL .500" sf_thvt_325_rn d 4816 Keystone 8 8 8 TP1, TP3, TP5, TP7, white Test Point, White, Thru Hole Color Keyed 0.100 x 0.100 inch 5002 Keystone 1 1 1 TP9 white Test Point, White, Thru Hole Color Keyed 0.100 x 0.100 inch 5001 Keystone 1 0 0 U1 bq24350DSG IC, OVER-VOLTAGE AND OVER-CURRENT CHARGER FRONT-END SON-8 BQ24350DSG TI 0 1 0 U1 bq24352DSG IC, OVER-VOLTAGE AND OVER-CURRENT CHARGER FRONT-END SON-8 BQ24352DSG TI 0 0 1 U1 bq24355DSG IC, OVER-VOLTAGE AND OVER-CURRENT CHARGER FRONT-END SON-8 BQ24355DSG TI 1 1 1 U2 BQ2057CSN IC, Charge Management, One or Two Cell Li-Ion or Li-Pol Charger S0-8 BQ2057CSN TI 1 1 1 -- HPA398 PCB, 2.8 In x 2.8 In x 0.062 In PCB Any TP2, TP4, TP6, TP8 Notes: 1. Number 0 in left side columns means do not use this component. 2. OPEN in value column means do not use this component. 3. Std in part number column means standard manufacturer’s part number. 4. Std in MFR column means standard manufacturer. 4.2 Board Layout Figure 2. Top Layer SLUU365 – June 2009 Submit Documentation Feedback bq2435x DSG EVM for Li-Ion Charger Front-End Protection IC 7 Bill of Materials, Board Layout, and Schematic www.ti.com Figure 3. Bottom Layer Figure 4. Top Silk Screen 8 bq2435x DSG EVM for Li-Ion Charger Front-End Protection IC SLUU365 – June 2009 Submit Documentation Feedback Bill of Materials, Board Layout, and Schematic www.ti.com Figure 5. Top Assembly SLUU365 – June 2009 Submit Documentation Feedback bq2435x DSG EVM for Li-Ion Charger Front-End Protection IC 9 Bill of Materials, Board Layout, and Schematic Schematic + 4.3 www.ti.com Figure 6. bq243550 Schematic 10 bq2435x DSG EVM for Li-Ion Charger Front-End Protection IC SLUU365 – June 2009 Submit Documentation Feedback EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh. No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used. FCC Warning This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 4.5 V to 26 V and the output voltage 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. Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures greater than 70°C. The EVM is designed to operate properly with certain components above 125°C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. 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