Texas instruments Bq2425xevm-150 User manual

User's Guide

SLUUA08A–March 2013–Revised April 2013

bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger

This user's guide describes the characteristics, operation, and use of the bq24250EVM-150,

bq24251EVM-150, and bq24257EVM-150 evaluation modules (EVM). These EVMs enable test and

evaluation TI's bq24250, bq24251, and bq24257 devices. The bq2425x series are highly integrated,

single-cell, Li-Ion battery chargers targeted for space-limited, portable applications with high-capacity

batteries. This user's guide includes EVM specifications, the schematic diagram, test procedures, test

results, a bill of materials, and board layout.

Contents

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

2 EVM Considerations ........................................................................................................ 3

3 Recommended Operating Condition ..................................................................................... 3

4 Equipment and EVM Setup ................................................................................................ 4

4.1 Schematic ........................................................................................................... 4

4.2 I/O Description ...................................................................................................... 5

4.3 Test Points .......................................................................................................... 5

4.4 Pin Descriptions .................................................................................................... 6

4.5 Control and Key Parameters Setting ............................................................................ 6

5 Test Procedure .............................................................................................................. 7

5.1 Definition ............................................................................................................ 7

5.2 Recommended Test Equipment ................................................................................. 7

5.3 Software ............................................................................................................. 7

5.4 Recommended Test Equipment Set Up ........................................................................ 8

5.5 Recommended Test Procedure ................................................................................ 10

6 Test Results ................................................................................................................ 12

6.1 Output Regulation Ripple ........................................................................................ 12

6.2 Efficiency Data .................................................................................................... 12

6.3 Thermal Performance ............................................................................................ 13

7 Layout and Bill of Materials .............................................................................................. 13

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

7.2 Layout .............................................................................................................. 14

7.3 Bill of Materials (BOM) ........................................................................................... 20

List of Figures

1 bq2425xEVM-150 Schematic ............................................................................................. 4

2 Original Test Setup ......................................................................................................... 8

3 Battery Emulator ........................................................................................................... 9

4 Connector Kit................................................................................................................ 9

5 Main Window of the bq2425xSW Evaluation Software............................................................... 10

6 Output Regulation Ripple at ICHG = 1000 mA ....................................................................... 12

7 Output Regulation Ripple at ICHG = 120 mA ......................................................................... 12

8 Efficiency Versus Output Current While in Battery Voltage Regulation (4.2V)”................................... 12

9 Thermal Image............................................................................................................. 13

10 bq2425xEVM-150 Top Assembly ....................................................................................... 14

11 bq2425xEVM-150 Top Silkscreen ...................................................................................... 15

I2C is a trademark of NXP.

SLUUA08A–March 2013–Revised April 2013 bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger

Introduction

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12 bq2425xEVM-150 Top Layer ............................................................................................ 16

13 bq2425xEVM-150 Second Layer (Internal) Routine .................................................................. 17

14 bq2425xEVM-150 Third Layer (Internal) Routine .................................................................... 18

15 bq2425xEVM-150 Bottom Layer ........................................................................................ 19

List of Tables

1 Connector and Test Points ................................................................................................ 5

2 Test Points Description..................................................................................................... 5

3 Pin Descriptions............................................................................................................. 6

4 Control and Key Parameters .............................................................................................. 6

5 bq2425xEVM-150 Bill of Materials ..................................................................................... 20

1 Introduction

The bq24250, bq24251, and bq24257 devices are highly-integrated, single-cell, Li-Ion battery chargers

with integrated current sense resistors targeted for space-limited, portable applications with high-capacity

batteries. The single-cell charger has a single input that operates from either a USB port or AC wall

adapter for a versatile solution. BC1.2-compliant D+/D– detection allows for recognition of CDP, DCP,

SDP, and non-standard USB adapters. The use of an accessory dead-battery provision (DBP) pin allows

for the system to sync a dead battery state in order to enable/disable the BC1.2 detection in the case of

an external USB-PHI.

The bq24250, bq24251, and bq24257 devices have two modes of operation: 1) I2C™ mode, and 2)

standalone mode. In I2C mode, the host adjusts the charge parameters and monitors the status of the

charger operation. In standalone mode, the external resistor sets the input-current limit, and charge-

current limit. Standalone mode also serves as the default settings when a DCP adapter is present. They

enter host mode while the I2C registers are accessed and the watchdog timer has not expired (if enabled).

The battery is charged in four phases: trickle charge, pre-charge, constant current and constant voltage. In

all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge

current if the internal temperature threshold is exceeded.

The bq24250 and bq24251 have system power path management. This feature allows this device to

power the system from a high efficiency DC/DC converter while simultaneously and independently

charging the battery. The charger monitors the battery current at all times and reduces the charge current

when the system load requires current above the input current limit. This allows for proper charge

termination and enables the system to run with a defective or absent battery pack. Additionally, this

enables instant system turn-on even with a totally discharged battery or no battery. The power-path

management architecture also permits the battery to supplement the system current requirements when

the adapter cannot deliver the peak system currents. This enables the use of a smaller adapter.

2bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger SLUUA08A–March 2013–Revised April 2013

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EVM Considerations

2 EVM Considerations

Refer to the data sheet for specific details on the charger ICs. The bq24250, bq24251, and bq24257

devices are featured with a high-efficiency switch-mode charger. It has integrated power FETs able to

charge at up to a 2-A charging rate, and an integrated 50-mA LDO. In I2C mode, the bq24250, bq24251,

and bq24257 devices have programmable battery charge voltage (VBATREG), charge current (ICHG), input

current limit (ILIM), and input over-voltage protection threshold (VOVP).

The charge current and the input current limit are programmed using external resistors (RISET and RILIM)

connected from the ISET and ILIM pins to ground. The range of these resistors can be found in the

datasheet. Both of these currents can be programmed up to 2 A. The bq24250, bq24251, and bq24257

devices also have complete system-level protection such as input undervoltage lockout (UVLO), input

over-voltage protection (OVP), battery OVP, sleep mode, thermal regulation and thermal shutdown,

voltage-based JEITA-compatible NTC monitoring input, and safety timer. PSE is also available – notify

your local TI representative.

3 Recommended Operating Condition

Specification Test Condition Min Typ Max Units

Input DC voltage, VIN Recommended input voltage range 4.35 10.5 V

Input current Recommended input current range 2 A

Charge current Fast charge current range 0.5 2 A

Output regulation voltage Standalone mode or I2C default mode 4.2 V

Output regulation voltage I2C host mode: operating in voltage regulation, 3.5 4.44 V

programmable range

LDO LDO output voltage 4.9 V

SLUUA08A–March 2013–Revised April 2013 bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger

BAT

G N D

CS IN /SYS

G N D

H IG H

LO W

1N ot Installed

G N D

2See U ser's guide for part usage

G N D

CS IN /SYS

G N D

BAT

M IC RO -U S B

STAT IN T

D + /EN 1

H IG H

LO W

D -/EN 2

H IG H

LO W

SC L

H IG H

LO W

SD A

H IG H

LO W

G N D

LD O

G N D

LD O

G N D

Fix

Var

3See U ser's guide for voltage ratings

1 1

1.0 Fµ

J14

200

TP9

TP10

JP3

D 1

1.50 k

20.0 k

100 k

TP1 TP2 TP4 TP5 TP7

JP1

JP4

TP6 TP8

TP3

J10

0.033 Fµ

JP2JP5

1.0 Fµ

R10

274 k

R11

100 k

JP6 JP7

J12

J13

J11

J15

JP8

JP9

JP10

TP11 TP12 TP13

249

267

1.0 Fµ

1.0 Hµ

TP14

TP15

1.0 Fµ

D 2

A1 BAT

A2 C SIN /SYS

A3 PG N D

A4 SW

A5 IN

B1 BAT

B2 C SIN /SYS

B3 PG N D

B4 SW

B5 IN

C1 BAT

C2 C SIN /S YS

C3 PG N D

C4 SW

C5 IN D 1

IS ET

D 2

D -/EN 2

D 3

D + /EN 1

D 4

D 5

PM ID

PG /IN T

SCL

STAT

VD PM

BO O T

SD A

PG N D

LD O

ILIM

BQ2425XYFF

BQ2425xYFF

BAT

D /EN 2

D + /EN 1

LD O

STAT PG /IN T

BAT

CS IN /SYS

SC L

SD A

BAT

CS IN /SYS

PG /IN T

LD O

D + /EN 1

LD O

D -/EN 2

LD O

D + /EN 1

D -/EN 2

SD A

SC L

ILIM

ILIM IS ET

IS ET

STAT

VD PM

SC L

LD O

SD A

LD O

CS IN /SYS

D + /EN 1

D -/EN 2

IS ET

ILIM

VD PM

LD O

Equipment and EVM Setup

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4 Equipment and EVM Setup

4.1 Schematic

Figure 1. bq2425xEVM-150 Schematic

4bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger SLUUA08A–March 2013–Revised April 2013

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Equipment and EVM Setup

4.2 I/O Description

This EVM is designed to operate over the full input voltage range. Refer to Table 1 for I/O connector

descriptions:

Table 1. Connector and Test Points

Header or Terminal Block Description

J1: Micro-USB Micro USB connector

J2: IN Positive input power supply

J4: GND Ground input power supply

J3: DC IN Input power supply (terminal block)

J5: BAT Positive battery pack terminal

J7:GND Negative battery pack terminal

J6: BATand GND Battery pack terminal (terminal block)

J11: LDO Positive LDO terminal

J13: GND Ground LDO terminal

J12: LDO and GND LDO terminal block

J8: CSIN/SYS Positive system terminal

J10: GND Negative system terminal

J9: SYS/CSIN and GND System terminal block

J14 Digital connector

J15: TS and GND TS terminal block

4.3 Test Points

Table 2 provides the descriptions for the test points in the EVM.

Table 2. Test Points Description

Test Point Description

TP1 SW

TP2 BAT

TP3 GND K

TP4 CSIN/SYS

TP5 IN

TP6 STAT

TP7 GND

TP8 PG/INT

TP9 SCL

TP10 SDA

TP11 ISET

TP12 ILIM

TP13 VDPM

TP14 BOOT

TP15 PMID

SLUUA08A–March 2013–Revised April 2013 bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger

Equipment and EVM Setup

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4.4 Pin Descriptions

Pin descriptions for the EVM are listed inTable 3.

Table 3. Pin Descriptions

PIN Number bq24250 bq24251 bq24257

YFF YFF YFF

A1,B1,C1 BAT BAT BAT

A2,B2,C2 SYS SYS CSIN

A3,B3,C3 PGND PGND PGND

A4,B4,C4 SW SW SW

A5,B5,C5 IN IN IN

D1 ISET ISET ISET

D2 EN2 D– D–

D3 EN1 D+ D+

D4 CE CE CE

D5 PMID PMID PMID

E1 INT PG PG

E2 SCL SCL SCL

E3 STAT STAT STAT

E4 VDPM VDPM VDPM

E5 BOOT BOOT BOOT

F1 TS TS TS

F2 SDA SDA SDA

F3 PGND PGND PGND

F4 LDO LDO LDO

F5 ILIM ILIM ILIM

4.5 Control and Key Parameters Setting

Table 4 lists and describes the jumpers on the EVM.

Table 4. Control and Key Parameters

Jumpers Description

JP1 Shorting Jumper D+/EN1 and D–/EN2

JP2 2-3 (D+/EN1 = HI):D+/EN1 to logic high

2-1 (D+/EN1 = LO): D+/EN1 to logic low

JP3 2-3 (CE = HI): To place the battery charger in standby mode.

2-1 (CE = LO): Charge enable

JP4 2-3 (TS = Variable): Connect TS pin to variable resistor

2-1 (TS = Fixed): Connect TS pin to fixed resistor

JP5 2-3 (D–/EN2 = HI): D–/EN2 to logic high

2-1 (D–/EN2 = LO): D–/EN2 to logic low

JP6 2-3 (SCL = HI): SCL to logic high

2-1 (SCL = LO): SCL to logic low

JP7 2-3 (SDA = HI): SCL to logic high

2-1 (SDA = LO): SCL to logic low

JP8 Shorting jumper connects CE to J14

JP9 Shorting jumper connects D+/EN1 to J14

JP10 Shorting jumper connects D–/EN2 to J14

6bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger SLUUA08A–March 2013–Revised April 2013

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Test Procedure

5 Test Procedure

This procedure describes the test configuration of the EVM for bench evaluation.

5.1 Definition

The following naming conventions are followed:

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

LOADW: External load name (LOADR, LOADI)

V(TPyy): Voltage at internal test point TPyy. For example, V(TP02) means the voltage at TP02

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

Assembly drawings show the location for jumpers, test points, and individual components.

5.2 Recommended Test Equipment

The following list includes the equipment and requirements necessary to perform all the tests in the test

procedure:

• Power supply #1 (PS #1) capable of supplying 12 V at 3 A

• Power supply #2 (PS #2) capable of supplying up to 5 V at 5 A to power the battery emulator

• A computer with at least one USB port and a USB cable

• Properly installed bq2425x evaluation software

• A HPA172 USB-to-I2C communication kit

• Three voltage meters (VM)

• Two equivalent current meters (A) able to measure 3-A current

5.3 Software

Download BQ2425xSW.zip from the charger's product folder, unzip the file, and double-click on the

SETUP.EXE file. Follow the installation steps. Because the bq2425x has the watchdog timer enabled, by

default, it is recommended to set the WD Timer Periodic Reset to 1 s, if it is desired to operate in host

mode. If standalone mode is desired, uncheck the Enable WD Timer while the device is only powered off

the battery. This mode of operation is important when evaluating the D+/D– detection function (only active

in standalone mode).

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, click the WRITE button to write changes to the software. Click the

READ button periodically to find the IC's instantaneous status.

Note that all devices in the bq2425x family include a safety timer. If the time indicated in the Safety Timer

Time Limit elapses, charging discontinues. If this occurs, a power reset or battery removal is required.

SLUUA08A–March 2013–Revised April 2013 bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger

Battery

Emulator

VM3

VM1

Windows

USB-to

GPIO (HPA172)

VM2

PS1

Test Procedure

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5.4 Recommended Test Equipment Set Up

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

current (handles 3 A).

2. Set power supply #1 (PS #1) for 6-V, 3-A current limit, then turn off supply.

Figure 2. Original Test Setup

8bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger SLUUA08A–March 2013–Revised April 2013

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Battery Range:

0 to 4.3 V,

Sinks up to 4.5 V/(2.2 /2) 4.0 A max

Connect to Charger BAT+ to BAT

Ω –

–

BAT+

BAT–

BAT+

BAT–

J1 1

0.1, 2 W 5 W–

Metal Strip

Sense Resistor

15FR100E

1 2 2

TBH25P5R6

2.2, 25 W

1N5821

BAT+

GND

P/S Range:

0 to 4.5 V,

3A max Current due to 1N5821

Connect to Power Source

PS #2 +

PS #2 –

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Test Procedure

3. Adjust power supply #2 (PS #2) for approximately 3.6 V to the input side (PS #2±) of the battery

emulator shown in Figure 3, then turn off PS #2.

Figure 3. Battery Emulator

4. Connect the output side of the battery or battery emulator in series with the current meter to J5 and J7

or J6 (BAT, GND).

5. Connect a voltmeter (VM#2) across J8 and J10 (SYS test point, GND).

6. Connect VM#3 across J5 and J7 (BAT, GND)

7. Connect J14 to the HPA172 kit with 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 4.

Figure 4. Connector Kit

8. By default, all jumpers are set to operate upon arrival.

9. After the proceeding steps have been performed, the test setup for PWR150 is configured as is shown

in Figure 2.

SLUUA08A–March 2013–Revised April 2013 bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger

Test Procedure

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Figure 5. Main Window of the bq2425xSW Evaluation Software

10. Turn on the computer. Open the bq2425x evaluation software. The main window of the software is

shown in Figure 5.

5.5 Recommended Test Procedure

5.5.1 Charge Voltage and Charge Regulation in Default Mode

1. Ensure that the recommended test setup is followed.

2. Connect the output of PS #1 in series with current meter (A #1) to J2 and J4 (IN, GND).

3. Connect VM #1 across J4 and J2 (IN, GND).

4. Ensure the CE is low by shorting JP3 to GND.

5. Turn on PS #1 and PS #2.

6. Enable PS #2 or equivalent battery and adjust PS #2 so that the voltage measured by VM #3, across

BAT and GND, measures 3.6 V ±50 mV.

7. Adjust the power supply so VM #1 still reads 6 V ± 100 mV and VM#3 reads 3.2 V.

•Measure on A #2 →ICHRG = 1000 mA ±150 mA

•Measure on A #1 →IIN = 600 mA ±100 mA

5.5.2 Input and Charge Current Regulation in Host Mode

1. Ensure that the recommended test setup is followed.

2. Follow Section 6 for initial setup

3. Open the bq2425x software:

• Press the READ button to obtain the current settings.

• Change the Input Current Limit to 100 mA

10 bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger SLUUA08A–March 2013–Revised April 2013

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