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User's Guide

SLUU916–April 2012

WCSP-Packaged bq24272/273 Evaluation Modules

The bq24272/273 evaluation module is a complete charger module for evaluating compact, flexible, high-

efficiency, switch-mode charge management solution for single-cell, Li-ion and Li-polymer batteries used

in a wide range of portable applications.

Contents

1 Introduction .................................................................................................................. 2

1.1 bq2427x IC Features .............................................................................................. 2

1.2 bq24272/273 EVM Features ...................................................................................... 2

1.3 Schematic ........................................................................................................... 3

1.4 I/O Description ...................................................................................................... 5

1.5 Test Points .......................................................................................................... 5

1.6 Control and Key Parameters Setting ............................................................................ 6

1.7 Recommended Operating Conditions ........................................................................... 6

2 Test Summary ............................................................................................................... 7

2.1 Definitions ........................................................................................................... 7

2.2 Recommended Test Equipment ................................................................................. 8

2.3 Recommended Test Equipment Setup .......................................................................... 9

2.4 Recommended Test Procedure ................................................................................ 12

3 Printed-Circuit Board Layout Guideline ................................................................................. 13

4 Bill of Materials and Board Layout ...................................................................................... 14

4.1 Bill of Materials .................................................................................................... 14

4.2 Board Layout ...................................................................................................... 16

List of Figures

1 bq24272/273EVM (HPA759) Schematic (Sheet 1 of 2) ............................................................... 3

2 bq24272/273EVM (HPA759) Schematic (Sheet 2 of 2) ............................................................... 4

3 BAT_Load (PR1010) Schematic .......................................................................................... 8

4 Connections of HPA172 Kit................................................................................................ 9

5 Original Test Setup for bq24272/273EVM (HPA759)................................................................. 10

6 Main Window of bq2427xSW Evaluation Software ................................................................... 11

7 Top Assembly Layer ...................................................................................................... 16

8 Top Layer .................................................................................................................. 16

9 First Internal Layer ........................................................................................................ 17

10 Second Internal Layer .................................................................................................... 17

11 Bottom Layer............................................................................................................... 18

List of Tables

1 Bill of Materials - HPA759A ............................................................................................. 14

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SLUU916–April 2012 WCSP-Packaged bq24272/273 Evaluation Modules

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Summary of content (27 pages)

PAGE 1
User's Guide SLUU916 – April 2012 WCSP-Packaged bq24272/273 Evaluation Modules The bq24272/273 evaluation module is a complete charger module for evaluating compact, flexible, highefficiency, switch-mode charge management solution for single-cell, Li-ion and Li-polymer batteries used in a wide range of portable applications. 1 2 3 4 Contents Introduction .................................................................................................................. 2 1.1 bq2427x IC Features ........
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Introduction 1 Introduction 1.1 bq2427x IC Features www.ti.com The bq24272/273 integrates a synchronous PWM controller, power MOSFETs, input-current sensing, high-accuracy current and voltage regulation, charge termination and power-path management into a small WCSP package. The charge parameters are programmable through an I2C interface. Key IC features include: • High-efficiency, fully integrated, NMOS-NMOS, synchronous buck charger with 1.5-MHz frequency • Integrated power FETs for up to a 2.
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Introduction www.ti.com 1.3 Schematic Figure 1.
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Introduction www.ti.com Figure 2. bq24272/273EVM (HPA759) Schematic (Sheet 2 of 2) NOTE: EVMs with a printed-circuit board label that contain the suffix -X may have been assembled with incorrectly marked ICs. Regardless of the IC’s marking, the EVM was assembled with the correct part number as specified in the EVM bill of material.
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Introduction www.ti.com 1.4 1.
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Introduction 1.6 1.7 www.ti.com Control and Key Parameters Setting Jumper Description Default Factory Setting JP1 bq24272 only 1-2 (FET GATE = SYS): External PFET's gate tied to SYS and therefore disabled. 2-3 (FET GATE = BGATE): External PFET's gate tied to BGATE pin and therefore controlled by IC.
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Test Summary www.ti.com 2 Test Summary This procedure describes one test configuration of the HPA759 evaluation board for bench evaluation. 2.1 Definitions The following naming conventions are followed. VXXX : LOADW: V(TPyyy): V(Jxx): V(TP(XXX)): V(XXX, YYY): I(JXX(YYY)): Jxx(BBB): JPx ON : JPx OFF: JPx (-YY-) Measure: → A, B Observe → A, B External voltage supply name (VADP, VBT, VSBT) External load name (LOADR, LOADI) Voltage at internal test point TPyyy.
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Test Summary www.ti.com 2.2 Recommended Test Equipment 2.2.1 Power Supplies 1. Power supply #1 (PS #1) capable of supplying 6 V at 3 A is required. 2. If not using a battery as the load, then power supply #2 (PS #2) capable of supplying up to 5 V at 4 A is required to power the circuit shown in Figure 3. 2.2.2 Load #1 Between BAT and GND Testing with an actual battery is the best way to verify operation in the system.
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Test Summary www.ti.com 2.2.7 Software Download bq2427xSW.zip from the charger's product folder, unzip the file, and double-click on the SETUP.EXE file. Follow the installation steps. Because the watchdog timer is enabled, it is recommended that you set the software's Reset Watchdog Timer to reset every 5 seconds. Otherwise, after 30 seconds of operation, the IC enters Default mode.
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Test Summary www.ti.com 10. After the preceding steps have been performed, the test setup for HPA759 is configured as shown in Figure 5 VM#1 + V í PS#1 í CM#1 A + IIN Windows PC USB-TOGPIO CM#3 + A ISYS CM#2 + í V A VM#3 í Elec Load/ Res Box PS#2 V í VM#2 í BAT_Load ICHRG + + V í + VM#4 Figure 5.
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Test Summary www.ti.com 11. Turn on the computer. Open the bq2427x evaluation software and click "IN DEVICE" when prompted at start-up. The main window of the software is shown in Figure 6. Figure 6.
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Test Summary 2.4 www.ti.com Recommended Test Procedure The following test procedure is useful for evaluating the charger IC outside of a real system, if no battery is available to connect to the output and a simulated battery is needed. 2.4.1 1. 2. 3. 4. 5. 6. 7. 8. 9. System Voltage and Output Current (bq24272 only) Ensure that the Section 2.3 steps are followed. Connect the output of PS #1 in series with CM #1 to J2 (IN, GND). Connect voltage meter 1 (VM #1) across J1 or TP1 and J3 (IN, GND).
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Printed-Circuit Board Layout Guideline www.ti.com 2.4.3 Helpful hints 1. To observe the taper current as the battery voltage approaches the set regulation voltage, allow the battery to charge or, if using BAT_Load (PR1010), slowly increase the PS #2 voltage powering BAT_Load (PR1010). Use VM #2 across BAT and GND to measure the battery voltage seen by the IC. 2. To observe the VINDPM function, lower the current limit on PS #1. 3.
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Bill of Materials and Board Layout www.ti.com 4 Bill of Materials and Board Layout 4.1 Bill of Materials Table 1. Bill of Materials - HPA759A COUNT RefDes 001 002 Value Description Size Part Number MFR 0 0 C1 Open Capacitor, ceramic, 25 V, X5R, 10% 0805 Std Std 1 1 C2 1 µF Capacitor, ceramic, 25 V, X5R, 10% 0603 Std Std 1 1 C3 4.7 µF Capacitor, ceramic, 25 V, X5R, 10% 0805 Std Std 1 0 C4 10 µF Capacitor, ceramic, 6.
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Bill of Materials and Board Layout www.ti.com Table 1. Bill of Materials - HPA759A (continued) 0 0 R10 Open Resistor, Chip, 1/16W, 1% 0603 Std Std 2 2 R11, R12 200 Ω Resistor, Chip, 1/16W, 1% 0603 Std Std 1 0 TP4 5000 Test point, red, thru hole color keyed 0.100 × 0.100 in 5000 Keystone 6 6 TP1, TP2, TP3, TP7, TP8, TP15, TP16 5000 Test point, red, thru hole color keyed 0.100 × 0.100 in 5000 Keystone 2 2 TP5, TP6 5001 Test point, black, thru hole color keyed 0.100 × 0.
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Bill of Materials and Board Layout 4.2 www.ti.com Board Layout Figure 7. Top Assembly Layer Figure 8.
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Bill of Materials and Board Layout www.ti.com Figure 9. First Internal Layer Figure 10.
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Bill of Materials and Board Layout www.ti.com Figure 11.
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EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: 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.
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FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
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【Important Notice for Users of this Product in Japan】】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
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EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
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EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: 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.
PAGE 24
FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
PAGE 25
【Important Notice for Users of this Product in Japan】】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
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EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
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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.