Texas Instruments Bq2427 Series User manual

User's Guide

SLUU924–April 2012

QFN-Packaged bq24270/271

Evaluation Modules

The bq24270/271 evaluation module is a complete charger module for evaluating compact, flexible, and

high-efficiency charge-management solutions for single-cell, Li-ion, and Li-polymer batteries used in a

wide range of portable applications. These charge-management solutions are also switch-mode and USB-

friendly.

Contents

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

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

1.2 bq24270/271EVM Features ...................................................................................... 2

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

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

1.5 Test Points .......................................................................................................... 4

1.6 Control and Key Parameters Setting ............................................................................ 5

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

2 Test Summary ............................................................................................................... 6

2.1 Definitions ........................................................................................................... 6

2.2 Recommended Test Equipment ................................................................................. 6

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

2.4 Recommended Test Procedure ................................................................................ 10

3 Printed-Circuit Board Layout Guideline ................................................................................. 11

4 Bill of Materials and Board Layout ...................................................................................... 13

4.1 Bill of Materials .................................................................................................... 13

4.2 Board Layout ...................................................................................................... 15

List of Figures

1 HPA758A Schematic ....................................................................................................... 3

2 BAT_Load (PR1010) Schematic.......................................................................................... 7

3 Connections of HPA172 Kit................................................................................................ 8

4 Original Test Setup for bq24270/271EVM (HPA758) .................................................................. 9

5 Main Window of bq2427x EVM Evaluation Software................................................................. 10

6 Top Assembly Layer ...................................................................................................... 15

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

8 First Internal Layer ........................................................................................................ 17

9 Second Internal Layer .................................................................................................... 18

10 Bottom Layer............................................................................................................... 19

List of Tables

1 Bill of Materials - HPA758................................................................................................ 13

I2C is a trademark of Philips Electronics N.V.

SLUU924–April 2012 QFN-Packaged bq24270/271 Evaluation Modules

Introduction

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1 Introduction

1.1 bq2427x IC Features

The bq24270/271 integrates a synchronous PWM controller, power MOSFETs, input-current sensing,

high-accuracy current and voltage regulation, charge termination, and power path management into a

QFN package. The charge parameters can be programmed through an I2C interface. Key integrated circuit

(IC) features include:

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

• Integrated power FETs for up to 1.5-A charge rate

• Power path management between battery and system voltages

For details, see the bq24270/271 data sheet (SLUSB10).

1.2 bq24270/271EVM Features

The bq24270/271EVM evaluation module (EVM) is a complete charger module for evaluating compact,

flexible, high-efficiency, USB-friendly, switch-mode battery charge. The module also evaluates power path

management solutions for single-cell, Li-ion and Li-polymer battery-powered systems used in a wide range

of portable applications. Key EVM features include:

• Input power connector for USB input

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

• USB operating range of 4.2 V – 6 V

• LED indication for status signals

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

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Introduction

1.3 Schematic

Figure 1. HPA758A Schematic

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Introduction

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1.4 I/O Description

Header/Terminal Block Description

J1–USB USB positive header

J2–USB USB positive terminal

J2–GND USB negative terminal

J3-GND USB negative header

J4 USB miniconnector

J5-SYS System output positive header

J6 USB-TO-GPIO box connector

J7-SYS System output positive terminal

J7-GND System output negative terminal

J8-TS External thermistor positive terminal

J8-GND Ground terminal for external thermistor

J9-GND System output negative header

J10-BAT Battery positive header

J11-BAT Battery positive terminal

J11-GND Battery negative terminal

J12-GND Battery negative header

J13-DRV DRV reference voltage positive header

J14-DRV DRV reference voltage positive terminal

J14-GND DRV reference voltage negative terminal

J15-GND DRV reference voltage negative header

1.5 Test Points

Test Point Description

TP1 AGND

TP2 Kelvin to USB

TP3 SW

TP4 Kelvin to SYS

TP5 PGND

TP6 AGND

TP7 PSEL

TP8 Kelvin to BAT

TP9 SDA

TP10 SCL

TP11 AGND

TP12 STAT

TP13 TS

TP14 CD

TP15 INT

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Introduction

1.6 Control and Key Parameters Setting

Jumper Description Default Factory Setting

JP1 1-2 (FET GATE = SYS): External PFET's gate tied to SYS and therefore disabled. 2-3 (FET GATE = BGATE)

2-3 (FET GATE = BGATE): External PFET's gate tied to BGATE pin and therefore

controlled by IC.

JP2 1-2 (CD = HI): Charge disable high to disable charge and enter Hi-Z mode 2-3 (CD = LO)

2-3 (CD = LO): Charge disable low for normal operation

JP3 bq24271 only 1-2 (PSEL = HI)

1-2 (PSEL = HI): Indicates that a USB source is connected to the USB input and sets

the input current limit to 500 mA.

2-3 (PSEL = LO): Indicates that an ac adapter is connected to the USB input and sets

the USB input current limit to 1.5 A.

JP6 1-2 (TS = DIS): Connects TS high to DRV and disables the temperature sense 2-3 (TS = SIM)

functioning the IC

2 (JP6 Open): Connects the TS pin to an external thermistor. The resistor divider

formed by R1 and R3 has been sized to accommodate a 10-kΩthermistor. If a different

thermistor is used, R1 and R3 must be resized.

2-3 (TS = SIM): Connects a potentiometer to the TS so that the potentiometer can

emulate a thermistor. The potentiometer has been preset to approximately 3.4 kΩso

that the TS voltage is 0.5 x V (DRV).

JP7 bq24270 only Shorted

Shorting jumper for USB data lines DM (D-) and DP (D+). When shorted, USB input

current limit defaults to 1.5 A. Otherwise, USB100 mode is selected.

1.7 Recommended Operating Conditions

Min Typ Max Unit

USB voltage, VUSB Input voltage from USB or equivalent supply 4.2 6 V

Battery voltage, VBAT Voltage applied at VBAT terminal of J8 0 3-4.2 4.44 V

Supply current, IUSB(MAX) Maximum input current from USB or equivalent supply 0.1 1.5 A

Maximum fast charge Battery charge current 0.550 1.5 A

current, Ichrg

Operating junction temperature range, TJ0 125 °C

SLUU924–April 2012 QFN-Packaged bq24270/271 Evaluation Modules

Test Summary

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2 Test Summary

This procedure describes one test configuration of the HPA758 evaluation board for bench evaluation.

2.1 Definitions

This procedure details how to configure the HPA758 evaluation board. The following naming conventions

are followed. See the bq24270/271 QFN EVM schematic for details.

VXXX : External voltage supply name (VADP, VAT, VSAT)

LOADW: External load name (LOADR, LOADI)

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 location for jumpers, test points, and individual components.

2.2 Recommended Test Equipment

2.2.1 Power Supplies

Power Supply #1 (PS#1) capable of supplying 6 V at 3 A is required.

If not using a battery as the load, then power supply #2 (PS#2) is can be used. 4 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 as the load is the best way to verify operation in the system. If a batttery is

not available, then a circuit similar to the one shown in Figure 2 can simulate a battery when connected to

a power supply.

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Test Summary

Figure 2. BAT_Load (PR1010) Schematic

2.2.3 Load #2 Between SYS and GND

Although not required, a resistive load in the form of a decade box or electronic load capable of sinking up

to 3 A can be used.

2.2.4 Meters

There are four equivalent voltage meters (VM#) and two equivalent current meters (CM#). The current

meters must be configured to measure 4-A current.

2.2.5 Computer

A computer with at least one USB port and a USB cable is required. The bq2427x evaluation software

must be properly installed.

2.2.6 HPA172 Communication Kit (USB to GPIO)

A HPA172 USB-to-I2C communication kit.

2.2.7 Software

Download the BQ2427xSW.zip file 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 integrated circuit (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 set the AutoRead and Write On Change functions, in the upper left of the

GUI window, to ON. The AutoRead function periodically updates the GUI with the IC status. The Write On

Change function writes any changes to the GUI check boxes, drop-down boxes, and registers to the IC.

Otherwise, the user is responsible for periodically pressing the READ button to find the IC instantaneous

status and WRITE button to write changes to the IC.

2.3 Recommended Test Equipment Setup

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

current amount.

SLUU924–April 2012 QFN-Packaged bq24270/271 Evaluation Modules

Computer

USB port

USB Interface

Adapter

I/O

USB

Texas Instruments

10-pin

Ribbon

Cable

To EVM

Test Summary

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2. Set Power Supply #1 (PS#1) for 6-V ± 100 mVdc, 3-A ± 100-mA current limit, and then turn off supply.

3. If BAT_Load is the circuit shown in Figure 2, connect Power Supply #2 (PS#2) set to approximately 3.1

V to the input side of BAT_Load, and then turn off PS#2.

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

(CM#2) to J10 and J12 or J11 (BAT, GND). Ensure that a voltage meter is connected across J10 or

TP8 and J12 or TP5 (BAT, GND).

5. Connect the electronic load or resistor decade box in series with a current meter (multimeter) to J5 and

J9 or J7(SYS, GND). Ensure the electronic load is in current mode and set to 0 A or the resistor

decade box is set to the maximum resistance.

6. Connect VM#3 across J5 or TP4 and J9 (SYS, GND).

7. Connect VM#4 across J13 and J15 (DRV, GND).

8. Connect J6 to HPA172 kit 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 default factory settings per Section 1.6

10. After the preceding steps have been performed, the test setup for HPA758 is configured as shown in

Figure 4

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Windows

USB-TO-

GPIO

PS#1

CM#1 IIN

+ -

VM#1

VM#4

V+

VM#2

CM#2

ICHRG -

BAT_Load

PS#2

VM#3

CM#3

ISYS -

Elec Load/

Res Box

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Test Summary

Figure 4. Original Test Setup for bq24270/271EVM (HPA758)

11. Turn on the computer.

• Open the bq2427x evaluation software and click "USB DEVICE" when prompted at start-up. The

main window of the software is shown in Figure 5.

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Test Summary

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Figure 5. Main Window of bq2427x EVM Evaluation Software

2.4 Recommended Test Procedure

The following test procedure is useful in evaluating the charger IC outside of a real system, especially

when no battery is available to connect to the output (i.e., Load #1).

2.4.1 System Voltage and Default Charge Settings

1. Ensure that the Section 2.3 steps are followed.

2. Connect the output of PS #1 in series with CM #1 to J2 (USB, GND).

3. Connect voltage meter 1 (VM #1) across J1 or TP2 and J3 (USB, GND).

4. With PS #2 disabled, turn on PS #1.

5. Ensure the electronic load is on current mode and set the current to 1 A or turn down the resistor

decade box until CM #3 measures 1000 ±100 mA.

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