Texas Instruments BQ24351EVM Manuale utente

User's Guide

SLUU455–October 2010

bq24351EVM for Li-Ion Charger Front-End Protection IC

This user's guide describes the features, setup, and operation of the bq24351EVM evaluation module.

Included are the bill of materials, board layout, and schematic.

Contents

1 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 ........................................................................... 3

1.5 Recommended Operating Conditions ........................................................................... 3

2 Test Summary ............................................................................................................... 3

2.1 Definitions ........................................................................................................... 3

2.2 Equipment ........................................................................................................... 3

2.3 Equipment Setup ................................................................................................... 4

2.4 Procedure ........................................................................................................... 5

3 PCB Layout Guideline ...................................................................................................... 5

4 Bill of Materials, Board Layout, and Schematic ......................................................................... 6

4.1 Bill of Materials ..................................................................................................... 6

4.2 Board Layout ....................................................................................................... 7

4.3 Schematic ......................................................................................................... 11

List of Figures

1 Original Test Setup for HPA666 (bq24351 DSG EVM)................................................................ 4

2 Top Layer .................................................................................................................... 7

3 Bottom Layer ................................................................................................................ 8

4 Top Silk Screen ............................................................................................................. 9

5 Top Assembly.............................................................................................................. 10

6 bq24351 Schematic....................................................................................................... 11

List of Tables

1 Bill of Materials.............................................................................................................. 6

SLUU455–October 2010 bq24351EVM for Li-Ion Charger Front-End Protection IC

Introduction

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1 Introduction

1.1 General Description

The bq24351 evaluation module (EVM) is a complete charger module for evaluating a charger front-end

protection and charger solution using the bq24351 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 bq24351 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 bq24351 data sheet (SLUSA62).

1.2 EVM Features

• Evaluation module for bq24351 DSG

• Evaluation module for bq2057C charger integrated circuit (IC)

• Input operating range for bq24351 4.5 V–26 V

• Input overvoltage protection.

• Input overcurrent protection.

• Battery overvoltage protection.

• LED indication for status signals.

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

• Jumpers available. Easy to change connections

1.3 I/O Description

Jack Description

J1–DC+ AC adapter, positive output

J1–DC– AC adapter, negative output, ground

J2–FAULT Reserved for other ICs

J2–VBAT bq24351 VBAT pin

J2–GATDRV bq24351 GATDRV pin

J2–CHGIN bq24351 CHGIN pin

J3–BATEN Reserved for ohter ICs

J3–OUT bq24351 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

2bq24351EVM for Li-Ion Charger Front-End Protection IC SLUU455–October 2010

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Test Summary

1.4 Controls and Key Parameters Setting

Jack (1) Description Factory Setting

JP1 If on, high-side sensing resistor is disabled Jumper on

JP2 Reserved for other ICs Jumper (BATEN, GND) on

JP3 bq24351 GATDRV pin Jumper off

JP4 bq2057C BAT pin connection to bq24351 Jumper on

JP5 bq2057C VCC pin connection to bq24351 Jumper on

JP6 bq2057C CC pin connection to bq24351 Jumper on

JP7 If on, low-side current-sensing resistor is disabled Jumper off

(1) Short JP1, JP4, JP5, and JP6, and disconnect JP7 to use onboard bq2057C as charger; to use external charger to control

bq24351, disconnect JP1, JP4, JP5, and JP6 and short JP7.

1.5 Recommended Operating Conditions

Symbol Description MIN TYP MAX Unit

Supply voltage, VIN Input voltage from ac adapter input 4.5 5 26 V

Battery voltage, VBAT Voltage applied at VBAT terminal of J4 0 3–4.2 5 V

Supply current, IAC Maximum input current from ac adapter input 0 1.5 A

Charge current, Ichrg Battery charge current 0.05 0.56 1 A

Operating junction temperature range, TJ0 125 °C

2 Test Summary

2.1 Definitions

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 points 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 show locations for jumpers, test points, and individual components.

2.2 Equipment

2.2.1 Power Supplies

Power supply 1 (PS 1): a power supply capable of supplying 15 V at 2 A is required.

SLUU455–October 2010 bq24351EVM for Li-Ion Charger Front-End Protection IC

FAULT

VBAT

GATDRV

CHGIN

BATEN

OUT

BAT+

GND

HPA666 bq24351EVM

JP7

Supply 1

DC+

JP1

BAT+

Ibat

CFET APPLICATION

CIRCUIT

JP6 JP5 JP4

JP3 JP2

Load

Test Summary

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2.2.2 Load 1

A 10-V (or above), 2-A (or above) electronic load that can operate in constant-current mode.

2.2.3 Load 2

A 10-V (or above), 2-A (or above) electronic load that can operate in 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 be at least AWG 22. The

maximum current is up to 1 A.

2.3 Equipment Setup

1. Set PS 1 for 0 V ±100 mVdc, 2 ± 0.1 A current limit, and then disable the output.

2. Connect the output of PS 1 to J1 (DC+, DC–).

3. Connect a voltage meter across J1 (DC+, DC–).

4. Connect the output of load 1 in series with a current meter (multimeter) to J2 (CHGIN) and J3 (GND).

Turn on the power of load 1. Set the load current to 1.5 A ±50 mA, but disable the output.

5. Connect the output of load 2 in series with a current meter (multimeter) to J4 (BAT+, BAT–).

6. Connect a voltage meter across J4 (BAT+, BAT–).

7. Set the voltage of load 2 to 3.6 V ±0.1 V, and disable output of load 2.

8. 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 HPA666 (bq24351 DSG EVM) appears as is

shown in Figure 1.

Figure 1. Original Test Setup for HPA666 (bq24351 DSG EVM)

4bq24351EVM for Li-Ion Charger Front-End Protection IC SLUU455–October 2010

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PCB Layout Guideline

2.4 Procedure

2.4.1 Charger Current and Voltage Regulation

1. Ensure that steps in Section 2.3 are followed.

2. Enable output of PS 1.

3. Increase the output voltage of PS 1 to 5 V ±0.1 V.

4. Enable the 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 11 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, D6 off, D7 on.

2.4.3 CFET Load Overcurrent Protection

1. Enable the output of load 1.

Observe →D2 on, D3 off, D6 off, D7 off.

2. Disable the output of load 1.

Observe →D2 on, D3 on, D6 off, D7 on.

3. Decrease the voltage of PS 1 to 0 V ±0.1 V.

3 PCB Layout Guideline

1. It is critical that the exposed thermal pad on the back side of the bq24351 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 the CHGIN and OUT pins must be sized

appropriately for the maximum charge current in order to avoid excessive voltage drops in these

traces.

3. Decoupling capacitors for ACIN and CHGIN must be placed to 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.

SLUU455–October 2010 bq24351EVM for Li-Ion Charger Front-End Protection IC

Bill of Materials, Board Layout, and Schematic

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4 Bill of Materials, Board Layout, and Schematic

4.1 Bill of Materials

Table 1. Bill of Materials

bq24351 RefDes Value Description Size Part Number MFR

1 C1 1 µF Capacitor, ceramic, 35-V, X5R, 10% 603 Std Std

3 C2, C3, C5 1 µF Capacitor, ceramic, 10-V, X7R, 10% 603 Std Std

1 C4 0.1 µF Capacitor, ceramic, 16-V, X7R, 10% 805 Std Std

1 C6 0.1 µF Capacitor, ceramic, 10-V, X7R, 10% 603 Std Std

1 C7 220 µF Capacitor, electrolytic, 25-V, 20% 0.327 inch × 0.327 UUD1E221MNL1GS Nichicon

inch (8.3 mm × 8.3

mm)

1 D1 BZT52C6V8S Diode, zener, 200-mW, 6.8-V SOD-323 BZT52C6V8S General

3 D2, D3, D6 Green Diode, LED, green, 2.1-V, 20-mA, 6-mcd 603 LTST-C190GKT LITE-ON

2 D4, D7 Red Diode, LED, red, 2.1-V, 20-mA, 6-mcd 603 LTST-C190CKT Lite-On

1 D5 BAT54C Diode, dual Schottky, 200-mA, 30-V SOT23 BAT54C Vishay/LITE-

2 J1, J4 ED1514/2DS Terminal block, 2-pin, 6-A, 3.5-mm 0.27 inch × 0.25 ED1514/2DS OST

inch (6.86 mm ×

6.35 mm)

2 J2, J3 ED1516/4DS Terminal block, 4-pin, 6-A, 3.5-mm 0.55 inch × 0.25 ED1516/4DS OST

inch (14 mm × 6.35

mm)

5 JP1, JP4, JP5, PEC02SAAN Header, 2-pin, 100-mil (2.54-mm) spacing 0.100 inch (2.54 PEC02SAAN Sullins

JP6, JP7 mm) × 2

2 JP2, JP3 PTC03SAAN Header, male 3-pin, 100-mil (2.54-mm) spacing, 0.100 inch (2.54 PTC03SAAN Sullins

(36-pin strip) mm) × 3

5 929950-00 Shorting jumpers, 2-pin, 100-mil (2.54-mm) 929950-00 3M/ESD

spacing

2 R1, R2 0 Resistor, chip, 1/16-W, 1% 402 Std Std

0 R3, R4 0 Resistor, chip, 1/16-W, 1% 402 Std Std

2 R5, R6 200 kΩResistor, chip, 1/16-W, 5% 402 Std Std

2 R7, R8 200 kΩResistor, chip, 1/16-W, 5% 603 Std Std

2 R9, R10 0.2 ΩResistor, metal film, 1/4-W, 1% 1206 Std Std

1 R11 20 kΩResistor, chip, 1/16-W, 5% 603 Std Std

1 R12 100 kΩResistor, chip, 1/16-W, 5% 603 Std Std

1 R13 100 ΩResistor, chip, 1/16-W, 5% 603 Std Std

1 R14 6.2 kΩResistor, chip, 1/16-W, 5% 603 Std Std

4 R15, R16, R17, 1.5 kΩResistor, chip, 1/16-W, 5% 603 Std Std

R18

1 R19 51 ΩResistor, chip, 1/16-W, 5% 603 Std Std

4 6-32 NYL nuts NY HN 632 H620-ND Building

Fasteners

4 ST1, ST2, ST3, 4816 Standoff, M/F, hex 6-32 NYL, 0.500 inch (12.7 sf_thvt_325_rnd 4816 Keystone

ST4 mm)

8 TP1, TP2, TP3, White Test point, white, thru hole, color-keyed 0.100 × 0.100 inch 5002 Keystone

TP4, TP5, TP6, (2.54 mm × 2.54

TP7, TP8 mm)

1 TP9 White Test point, white, thru hole, color-keyed 0.100 × 0.100 inch 5001 Keystone

(2.54 mm × 2.54

mm)

1 U1 bq24351DSG IC, overvoltage and overcurrent charger front-end SON-8 bq24351DSG TI

1 U2 bq2057CSN IC, charge management, one- or two-cell Li-Ion SOIC(SN) bq2057CSN TI

or Li-Pol charger

1 — HPA666 PCB, 2.8-inch × 2.8-inch × 0.062-inch (7.11-cm × PCB Any

7.11-cm × 1.58-mm)

Notes: 1. Number 0 in left side columns means do not use this component.

2. Std in part number column means standard manufacturer’s part number.

6bq24351EVM for Li-Ion Charger Front-End Protection IC SLUU455–October 2010

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C001

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Bill of Materials, Board Layout, and Schematic

4.2 Board Layout

Figure 2. Top Layer

SLUU455–October 2010 bq24351EVM for Li-Ion Charger Front-End Protection IC

C002

Bill of Materials, Board Layout, and Schematic

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Figure 3. Bottom Layer

8bq24351EVM for Li-Ion Charger Front-End Protection IC SLUU455–October 2010

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C003

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Bill of Materials, Board Layout, and Schematic

Figure 4. Top Silk Screen

SLUU455–October 2010 bq24351EVM for Li-Ion Charger Front-End Protection IC

C004

Bill of Materials, Board Layout, and Schematic

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Figure 5. Top Assembly

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