Texas Instruments Bq24187 Manuale utente

User's Guide

SLUUAI5 –April 2014

bq24187 Evaluation Module User's Guide

The bq24187 evaluation module is a complete charger module for evaluating compact, flexible, high-

efficiency, USB-friendly, 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 BQ24187 IC Features.............................................................................................. 2

1.2 bq24187EVM Features ............................................................................................ 2

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

1.4 I/O Description ...................................................................................................... 4

1.5 Test Points to IC Pins.............................................................................................. 4

1.6 Control and Key Parameters Setting............................................................................. 4

1.7 Recommended Operating Conditions............................................................................ 5

2 Test Summary................................................................................................................ 5

2.1 Definitions............................................................................................................ 5

2.2 Recommended Test Equipment .................................................................................. 5

2.3 Recommended Test Equipment Setup .......................................................................... 7

2.4 Recommended Test Procedure................................................................................... 9

3 Printed-Circuit Board Layout Guideline.................................................................................. 10

4 Bill of Materials and Board Layout ...................................................................................... 11

4.1 Bill of Materials .................................................................................................... 11

4.2 Board Layout....................................................................................................... 12

List of Figures

1 bq2418xEVM Schematic.................................................................................................... 3

2 BAT_Load (PR1010) Schematic........................................................................................... 6

3 Connections of HPA172 Kit ................................................................................................ 7

4 Recommended Initial Test Setup for bq24187EVM-625 ............................................................... 8

5 Main Window of BQ24187SW Evaluation Software..................................................................... 8

6 Top Assembly Layer....................................................................................................... 12

7 Top Layer ................................................................................................................... 13

8 First Internal Layer ......................................................................................................... 14

9 Second Internal Layer ..................................................................................................... 15

10 Bottom Layer................................................................................................................ 16

List of Tables

1 Bill of Materials - PWR625A ............................................................................................. 11

SLUUAI5 –April 2014 bq24187 Evaluation Module User's Guide

Introduction

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1 Introduction

1.1 BQ24187 IC Features

The BQ24187 family integrates a synchronous PWM controller, power MOSFETs, input-current sensing,

high-accuracy current and voltage regulation and charge termination into a small WCSP package. The

charge parameters can be programmed through an I2C interface. Key IC features include:

• High-efficiency, fully integrated, NMOS-NMOS, synchronous buck charger with 1.5-MHz frequency

• Charge time optimizer

• Integrated power FETs for up to 2-A charge rate

• 5-V, 1-A on-the-go (OTG) VBUS supply

For details, see the bq24187 data sheet (SLUSBM0).

1.2 bq24187EVM Features

The bq24187 evaluation module (EVM) provides a complete charger module for evaluating compact,

flexible, high-efficiency, USB-friendly, switch-mode battery charge solutions for single-cell, Li-ion and Li-

polymer battery-powered systems used in a wide range of portable applications. Key EVM features

include:

• Terminal blocks and standard headers for IN, BAT, TS; USB connector for IN

• Programmable battery voltage, charge current, input current, and status via I2C interface

• IN operating up to 6.0 V

• LED indication for status signals

• Test points for key signals available for testing purposes. Easy probe hook-up

2bq24187 Evaluation Module User's Guide SLUUAI5 –April 2014

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J10

BAT

DRV

JP6

HIGH

up to 4.44V, 2A

PSEL

BAT

LOW

Open

C6 1

J11

GND

BAT

GND

BQ24187YFF

PGND

A1 PGND

A2 PGND

A3 PGND

A4 PGND

A5 PGND

PMID

SW B2

SW B3

SW B4

SW B5

SW B6

BOOT C6

SDA

SCL

NC D3

TS D5

DRV D6

STAT

INT

CS+ E3

CS+ E4

CS+ E5

CS+ E6

AGND

F1 NC F2

BAT F3

BAT F4

BAT F5

BAT F6

PSEL

BQ2418XYFF

1.0uF

GND

JP1

USB R9

GND

PSEL

1.0uF

GND

22uF

up to 6V, 2.5A

GND

INT

STAT

DRV

1.0uF

4.7uF

Open

PSEL

GND

SCL

GND

SDA

GND

0.033uF

GND

DRV

1.5 uH

DRV

JP4

HIGH

DRV 1

LOW

DRV

GND

EXT

5.62k

TP9

GND

DRV

GND

JP5

EXT

JP2

JP3

TP10

SCL

SIM

J12

12.4k

STAT

GND

INT TP1TP2 TP3TP4 TP5 TP7

GND

GND 200

TP11

BAT SDA

GND

CS+

50K

GND

1.50k

TP6 TP8

INTSTAT 200

CS+

GND

1 1

1 See BOM for values

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Introduction

1.3 Schematic

Figure 1 illustrates the bq2418x EVM schematic.

Figure 1. bq2418xEVM Schematic

SLUUAI5 –April 2014 bq24187 Evaluation Module User's Guide

Introduction

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1.4 I/O Description

Header/Terminal Block Description

J1– IN/GND Input power positive and negative terminal

J2 – USB USB miniconnector

J3 - GND DRV linear regulator negative header

J4 - IN Input power positive header

J5 - GND Battery negative header

J6 - DRV DRV linear regulator positive output

J7 - DRV/GND DRV linear regulator positive and negative terminals

J8 - GND Input power negative header

J9 - EXT TS/GND External thermistor terminal

J10 - GND Battery positive header

J11 - BAT/GND Battery positive and negative terminal

J12 - USB-TO-GPIO USB-TO-GPIO box keyed connector

1.5 Test Points to IC Pins

Test Point Description

TP1 BAT

TP2 SW

TP3 GND

TP4 CS+

TP5 GND

TP6 STAT

TP7 GND

TP8 INT

TP9 TS

TP10 SCL

TP11 SDA

1.6 Control and Key Parameters Setting

Jumper Description Default Factory Setting

JP1 N/A Not installed

JP2 Shorting jumper to connect DRV to annode of D1 STAT LED SHORTED

JP3 Shorting jumper to connect DRV to annode of D1 INT LED SHORTED

CD = LO: Charge disable low for normal operation

JP4 CD = LO

CD = HI: Charge disable high to disable the buck converter and enter Hi-Z mode

TS = SIM: Connects a potentiometer to the TS pin so that the potentiometer can

simulator a thermistor. The potentiometer is preset per R5 and R6 so that the TS

voltage is 0.5 x V (DRV).

JP5 TS=SIM

TS = EXT: Connects the TS pin to an external thermistor through J9. The resistor

divider formed by R5 and R6 is sized to accommodate a 10-kΩthermistor. If a different

thermistor is used, R5 and R6 must be resized.

PSEL = LOW: Input current limit is set to 1.5 A until changed by I2C.

JP6 PSEL = HIGH: Default mode input current limit is set to 100 mA until changed by I2C. PSEL = LOW

Default mode input current limit is set to 1.5 A until changed by I2C.

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Introduction

1.7 Recommended Operating Conditions

Min Typ Max Unit

Supply voltage, VIN Input voltage from ac adapter (bq24262) 4.2 6.0 V

Battery voltage, VBAT Voltage output at VBAT terminal (registers set via I2C 3.5 4.2 4.44 V

communication)

Supply current, IIN(MAX) Maximum input current from ac adapter input (registers set 0.1 2.0 A

via I2C communication)

Fast charge current, Battery charge current (registers set via I2C communication) 0.500 2.0 A

ICHRG(MAX)

Operating junction temperature range, TJ-40 125 °C

2 Test Summary

This procedure describes one test configuration of the HPA721 evaluation board for bench evaluation.

2.1 Definitions

The following naming conventions are followed.

VXXX : External voltage supply name (VADP, VBT, VSBT)

LOADW: External load name (LOAD1, LOAD2)

V(TPyyy): Voltage at internal test point TPyyy. For example, V(TP12) means the voltage at

TP12.

V(Jxx): Voltage at header Jxx

V(TP(XXX)): Voltage at test point XXX. 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 header XX

Jxx(BBB): Terminal or pin BBB of header xx

JPx ON : Internal jumper Jxx terminals are shorted

JPx OFF: Internal jumper Jxx terminals are open

JPx (-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 locations for jumpers, test points, and individual components.

2.2 Recommended Test Equipment

2.2.1 Power Supplies

1. A power supply #1 (PS #1) capable of supplying 5 V at 2.5 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 5 A

is required to power the circuit shown in Figure 2.

2.2.2 Load #1 Between BAT and GND

Testing with an actual battery is the best way to verify operation in the system. If a battery is not available,

then a circuit similar to the one shown in Figure 2 can simulate a battery when connected to a power

supply. Alternatively, a sourcemeter, capable of sourcing and sinking current can be used to simulate a

battery.

SLUUAI5 –April 2014 bq24187 Evaluation Module User's Guide

Test Summary

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Figure 2. BAT_Load (PR1010) Schematic

2.2.3 Meters

Four equivalent voltage meters (VM #) and two equivalent current meters (CM #) are required. The current

meters must be able to measure 3-A current.

2.2.4 Computer

A computer with at least one USB port and a USB cable is required. The BQ24187 evaluation software

must be properly installed.

2.2.5 HPA172 Communication Kit (USB TO GPIO)

An HPA172 USB-to-I2C communication kit is required.

2.2.6 Software

Download BQ24187SW.zip from the charger's product folder, unzip the file, and double-click on the

SETUP.EXE file. Follow the installation steps.

Because the bq24187 has a watchdog timer, 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. Note that the 27-minute safety timer is not reset by this function and eventually times out if

charging does not complete, unless the Safety Timer Time Limit is expanded or disabled via the GUI.

One way to reset the safety timer is to allow the 30-second watchdog timer to expire. See Figure 3 in the

data sheet for more information about the timers.

Also, it is generally helpful to activate the Write On Change functions, in the upper left of the GUI window,

to ON. The Write On Change function writes any changes to the GUI's check boxes, drop-down boxes,

and registers to the IC. Otherwise, the user must click the WRITE button to write changes to the software.

It is recommended that the user periodically click the READ button to find the IC's instantaneous status.

Alternatively, the AutoRead function can be activated to periodically update the GUI with the IC's status.

6bq24187 Evaluation Module User's Guide SLUUAI5 –April 2014

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Computer

USB port

USB Interface

Adapter

I/O

USB

Texas Instruments

10-pin

Ribbon

Cable

To EVM

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Test Summary

2.3 Recommended Test Equipment Setup

1. For all power connections, use short, twisted-pair wires of appropriate gauge wire for the amount of the

current.

2. Set PS #1 for 5-V, 2.5-A current limit and then turn off supply.

3. Connect the output of PS #1 in series with a current meter (CM #1) to J1 (IN).

4. Connect a voltmeter (VM #1) across J4 and J3 (IN and GND).

5. If BAT_Load as shown in Figure 1 is used, connect PS #2, set to approximately 3.7 V, to the input side

(PS #2+/-) of BAT_Load, then turn off PS #2.

6. Connect the output side of the battery or BAT_Load in series with current meter (multimeter) #2 (CM

#2) to J11 and J10 or J5 (BAT, GND). Ensure that a voltage meter (VM #2) is connected across J10 or

TP1 and J5 or TP7 (BAT and GND).

7. Connect VM #3 across J6 and J8 (DRV and GND).

8. Connect the HPA172 kit to J12 by the 10-pin ribbon cable. Connect the USB port of the HPA172 kit to

the USB port of the computer. The connections are shown in Figure 3.

Figure 3. Connections of HPA172 Kit

9. Ensure jumpers are at the settings highlighted in yellow (except for JP1 which is not installed) per

Section 1.6.

SLUUAI5 –April 2014 bq24187 Evaluation Module User's Guide

AVVM#2

CM#2

ICHRG

#1 A

VM#3

CM#1

IIN

VM#1

Windows

USB-TO-

GPIO

BAT_Load

PS#2

Test Summary

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10. After the preceding steps have been performed, the test setup for bq24187EVM-625 is configured as

is shown in Figure 4

Figure 4. Recommended Initial Test Setup for bq24187EVM-625

11. Turn on the computer. Open the BQ24187 evaluation software. Figure 5 shows the main window of

the software.

Figure 5. Main Window of BQ24187SW Evaluation Software

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Test Summary

2.4 Recommended Test Procedure

The following test procedure may be 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, if needed.

2.4.1 Charge Voltage and Current Regulation of IN

1. Ensure that the steps in Section 2.3 are followed.

2. Move JP4 to LO.

3. Turn on PS #1.

4. Enable PS #2 and adjust PS #2 so that the voltage measured by VM #2, across BAT and GND,

measures 3.2 V ±50 mV.

5. Adjust the power supply so that VM #1 still reads 5 V ±100 mV, if necessary, then

Measure on CM #2 →ICHRG < 120 mA

Measure on CM #1 →IIN = 90–100 mA

6. Software setup:

• Press the READ button to obtain the current settings.

• Set Write On Change to ON, if not already set.

• Set Safety Timer to Disabled.

• Set Reset Watchdog Timer to update every 5 seconds.

• Uncheck Disable Charging if checked.

• Check Enable STAT/INT Outputs.

• Set Battery Regulation Voltage to 4.20 V.

• Set IN Input Current Limit to 2.0 A.

• Set Charge Current to 1000 mA.

• Click the READ button at the top of the window and confirm that the previous settings remain.

7. Enable PS #2 and adjust PS #2 so that the voltage measured by VM #2, across BAT and GND,

measures 3.8 V ±50 mV.

8. Adjust the power supply so that VM #1 still reads 5 V ±100 mV, if necessary, then

Measure on CM #2 →ICHRG = 1000 mA ±50 mA

Measure on CM #1 →IIN < 750 mA

9. Turn off PS #1 and PS #2.

2.4.2 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 VIN-DPM feature, lower the current limit on PS #1.

SLUUAI5 –April 2014 bq24187 Evaluation Module User's Guide

Printed-Circuit Board Layout Guideline

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3 Printed-Circuit Board Layout Guideline

1. To obtain optimal performance, the power input capacitors, connected from the PMID input to PGND,

must be placed as close as possible to the IC.

2. Place 4.7-µF input capacitor as close to PMID pin and PGND pin as possible to make the high-

frequency current loop area as small as possible. Place 1-µF input capacitor GNDs as close to the

respective PMID capacitor GND and PGND pins as possible to minimize the ground difference

between the input and PMID.

3. The local bypass capacitor from CS+ to GND must be connected between the CS+ pin and PGND of

the IC. The intent is to minimize the current path loop area from the SW pin through the LC filter and

back to the PGND pin.

4. Place all decoupling capacitors close to their respective IC pins and as close as possible to PGND (do

not place components such that routing interrupts power stage currents). All small control signals must

be routed away from the high-current paths.

5. The PCB must have a ground plane (return) connected directly to the return of all components through

vias (two vias per capacitor for power-stage capacitors, one via per capacitor for small-signal

components). It is also recommended to put vias inside the PGND pads for the IC, if possible. A star

ground design approach is typically used to keep circuit block currents isolated (high-power/low-power

small-signal) which reduces noise-coupling and ground-bounce issues. A single ground plane for this

design gives good results. With this small layout and a single ground plane, no ground-bounce issue

exists, and having the components segregated minimizes coupling between signals.

6. The high-current charge paths into IN, USB, BAT, and from the SW pins must be sized appropriately

for the maximum charge current in order to avoid voltage drops in these traces. The PGND pins must

be connected to the ground plane to return current through the internal low-side FET.

7. For high-current applications, the balls for the power paths must be connected to as much copper in

the board as possible. This allows better thermal performance because the board conducts heat away

from the IC.

10 bq24187 Evaluation Module User's Guide SLUUAI5 –April 2014

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