Texas Instruments BQ25886 User manual

SLUUC11–February 2019

BQ25886 QFN Standalone boost-mode battery charger evaluation module

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User's Guide

SLUUC11–February 2019

BQ25886 QFN Standalone boost-mode battery charger

evaluation module

This user's guide provides detailed testing instructions for the BQ25886 evaluation module (EVM). Also

included are descriptions of the necessary equipment, equipment setup, procedures, the printed-circuit

board layouts, schematics, and the bill of materials (BOM).

Throughout this user's guide, the abbreviations EVM, BQ25886EVM, BMS016, and the term evaluation

module are synonymous with the BQ25886 QFN evaluation module, unless otherwise noted.

Contents

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

1.1 EVM Features....................................................................................................... 2

1.2 I/O Descriptions..................................................................................................... 2

2 Test Summary................................................................................................................ 4

2.1 Equipment ........................................................................................................... 4

2.2 Charge Mode........................................................................................................ 5

2.3 OTG Mode .......................................................................................................... 8

2.4 Helpful Tips ........................................................................................................ 10

3 PCB Layout Guidelines.................................................................................................... 10

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

4.1 Board Layout....................................................................................................... 11

4.2 Schematic .......................................................................................................... 12

4.3 Bill of Materials .................................................................................................... 13

List of Figures

1 BQ25886 Charge Mode Test Setup ...................................................................................... 5

2 Charge Mode Startup ....................................................................................................... 7

3 BQ25886 OTG Mode Test Setup.......................................................................................... 8

4 OTG Mode Startup .......................................................................................................... 9

5 BQ2588xEVM Top Overlay............................................................................................... 11

6 BQ2588xEVM Layer 2..................................................................................................... 11

7 BQ2588xEVM Layer 3..................................................................................................... 11

8 BQ2588xEVM Bottom Overlay ........................................................................................... 11

9 BQ25886EVM Schematic ................................................................................................. 12

List of Tables

1 Device Data Sheets ......................................................................................................... 2

2 EVM Connections............................................................................................................ 2

3 EVM Jumper Connections and Shunt Installation....................................................................... 3

4 Recommended Operating Conditions..................................................................................... 3

5 BQ25886EVM .............................................................................................................. 13

Introduction

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Trademarks

All trademarks are the property of their respective owners.

1 Introduction

As industry improvements continue to make portable electronics more powerful, their power requirements

increase. Using two series Li-Ion polymer cells is one way to achieve this power increase. Charging these

8.4-V battery packs from a legacy 5-V USB port requires a boost charger. The BQ25886 is a highly-

integrated 2-A boosting, 1.5-MHz switch-mode battery charge management device for a 2s Li-Ion and Li-

polymer battery. BQ25886 is the standalone solution which device can operate without the need of a host.

1.1 EVM Features

The BQ25886 QFN evaluation module (EVM) is a complete charger module for evaluating the standalone,

2s battery NVDC charger in the QFN package. Key features of this EVM include:

• Easily evaluate the high-efficiency 2-A, 1.5-MHz integrated field-effect-transistor (FET), switch-mode

boost charger in the QFN package

• Use of an onboard USB input adapter for connecting to a USB source and either communication

through D+/D– to set the default input current limit

• Onboard test points, sense resistors, and jumpers facilitate measurement of high-efficiency- and high-

accuracy voltage and current regulation

See the device data sheet (Table 1) for detailed features and operation of the integrated circuit (IC).

Table 1. Device Data Sheets

Device Data Sheet EVM Label Variant

BQ25886 SLUSDE6 BQ25886EVM-002 002

1.2 I/O Descriptions

Table 2 lists the jumper connections available on this EVM.

Table 2. EVM Connections

Jack Description

J1(2)–VBUS Connection for positive terminal of charger power source

J1(1)–GND Connection for negative terminal (ground terminal) of charger power source

J2(1)–SYS Connection to system load

J2(2)–GND Ground

J3(1)–PMID PMID pin connection

J3(2)–GND Ground

J4(1)–BAT+ Connection for battery pack positive node to BAT pin

J4(2)-TOP-

/BOT+ Connection for the mid connection point of the top and bottom cell (BQ25887only. Do

not use for BQ25883 or BQ25886)

J5(1)–GND Connection to battery pack negative node = EVM ground

J5(2)–TS Connection for the NTC thermistor

J6 I2C 4-pin connector for EV2400

J7 Input mini-USB port

lists the EVM jumper connections.

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Introduction

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BQ25886 QFN Standalone boost-mode battery charger evaluation module

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Table 3. EVM Jumper Connections and Shunt Installation

Jack Description BQ25886 Setting

JP1 STAT, PG, CE pins 3.3-V LDO pullup source of either SYS (pin 1 to 2) or BAT (pin 2 to 3) Shunt pins 2 and 3

JP2 ILIM pin connection to resistor to GND Installed

JP3 Connects D+ pin to pin 3 of J5 mini-USB port Installed

JP4 DNI NA

JP5 TS resistor divider pullup source (REGN) connection Installed

JP6 Connects D– pin to pin 2 of J5 mini-USB port Installed

JP7 Connects an onboard 10 kΩfrom TS pin to GND Installed

JP8 Connects OTG pin to GND Open

JP9 Connects CE pin to GND Installed

JP10 Pulls up STAT through diode and resistor to pullup source Installed

JP11 Pulls up PG through diode and resistor to pullup source Shunt pins 2 and 1

JP12 Pull up GND pin to GND Shunt pins 2 and 3

JP13 NC pin Open

JP14 DNI NA

JP15 Pull up CE pin through 10-kΩresistor Open

JP16 Connects VSET to GND through 18-kΩresistor sets VREG to 8.2V Open

JP17 Connects VSET to GND through 39.2-kΩresistor sets VREG to 8.8V Open

JP18 Connects VSET to GND through 75-kΩresistor sets VREG to 8.7V Open

JP19 Connects VSET to GND through 150-kΩresistor sets VREG to 8.4V Installed

Table 4 lists the recommended operating conditions for this EVM.

Table 4. Recommended Operating Conditions

Symbol Description MIN TYP MAX Unit

Supply voltage, VVBUS Input voltage from AC adapter 4.3

Battery voltage, VBAT in charge

mode Voltage applied at VBAT terminal 0 or

floating 8.4 9.2 V

IBAT Fast charging current 0 — 2.2 A

Discharging current through internal MOSFET 6 — — A

Supply current, IIN Maximum input current from AC adapter input 0 — 3.3 A

Test Summary

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2 Test Summary

2.1 Equipment

This section includes a list of supplies required to perform tests on this EVM.

1. Power supply (PS#1) : The power supply must be capable of supplying up to 6.5 V at 3.3 A. While this

part can handle larger voltage and current, it is not necessary for this procedure.

2. Battery simulator (BS#1) : Four-quadrant supply set to constant voltage ≤9.2 V

Example: Kepco Bipolar Power Supply: BOP 20–5M, DC 0 to ±20 V, 0 to ±5 A (or higher) and Keithley

2420 Sourcemeter

3. Load #1: Electronic or resistive load capable of sinking up to 3 A at 9.2 V

4. Meters: Six Fluke 75 multimeters (equivalent or better)

• Alternatively; four equivalent voltage meters and two equivalent current meters. The current meters

must be capable of measuring greater than 3 A of current. A current meter in series with the

battery or battery simulator must have auto-ranging disabled and should only be used for DC

measurements (no start-up, transients, and so forth).

VM#1

Power

Supply

PS#1

VM#4 VVM#5VM#2 VM#3

VVM#6

AGND

V V

Battery

Simulator

BS#1

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Test Summary

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2.2 Charge Mode

2.2.1 Charge Mode Test Setup

Use the following list to set up the equipment for charge mode operation:

1. Figure 1 shows the test setup for BQ25886 when in charge (boosting) mode including jumper settings

per Table 2. Ensure that the power supply and battery simulator are turned off before connecting to the

EVM.

Figure 1. BQ25886 Charge Mode Test Setup

2. Voltmeters 1 through 3 (VM1, VM2, and VM3) connect to Kelvin test points for measuring VBUS, SYS,

and BAT as close to the IC pins as possible. Voltmeters 4 through 6 measure the voltage across 0.01

Ω, which gives the current.

3. Before attaching to the EVM, set battery simulator 1 (BS#1) no higher than 7.6 V and at a 2.5-A

current limit and set power supply 1 (PS#1) for 5.5 V and a 3.5-A current limit.

4. Turn off BS#1 and PS#1 then attach BS#1 to the BAT (J4) and PGND(J5) terminal of the EVM and

attach PS#1 to J1 (VBUS, GND) of the EVM.

5. For and BQ25886, optionally, turn off an electronic load and attach to the J2 (SYS, GND) terminal of

the EVM.

6. For BQ25886EVM, place shunt on JP15. Adjust R31 potentiometer such that the resistance measured

between TP18 and TP26 is 4.15kΩ. Adjust R5 potentiometer such that the resistance measured

between TP21 AND tp26 is 500Ω. Short D+ and D- pin to put the device in DCP upon adapter plug in

(Place shunt on JP3 pin 2 to JP6 pin 1).

2.2.2 Charge Mode Test Procedure

Use the following steps for charge mode verification and testing:

Test Summary

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1. Turn on PS#1 and click the Read Register button twice.

•Observe →everything "Normal" at the Fault box

•Observe →D4 (STAT) is off because charge is disabled.

•Observe →D5 (PG) is on indicating power is good.

•Measure on VM2 →V(TP14 (SYS), TP26 (AGND)) = 6.4 V ±50 mV

2. On BQ25886EVM, remove shunt on JP15 to start charge. To correct for cable resistance, adjust PS#1

until VM1 [TP7 (VBUS_S), TP26 (AGND)] measures 5.5 V ±50 mV and adjust BS#1 until VM3 [TP15

(BAT), TP26 (AGND)] measures 7.6 V ±50 mV.

•Measure on VM6 →V(TP5 (RBAT+), TP6 (RBAT-)) = 10 mV ±0.7 mV which corresponds to ICHG

= 1.0 A ±5% through a 0.010-Ω±1% resistor. Voltage of 0.1 mV is added to account for DMM

accuracy.

•Measure on VM4 →V(TP1 (RAC+), TP2 (RAC-)) = 14.8 mV ±0.7 mV which corresponds to IVBUS

= 1.48 A ±5% (accounting for efficiency variation across ICs and inductors) through a 0.010-Ω±1%

resistor. Voltage of 0.1 mV is added to account for DMM accuracy.

3. Optionally, . Adjust the RLIM potentiometer (R5) until:

•Measure on VM4 →V(TP1 (RAC+), TP2 (RAC-)) = 10 mV ±0.7 mV which corresponds to IVBUS =

1.0 A ±5% through a 0.010-Ω±1% resistor. Voltage of 0.1 mV is added to account for DMM

accuracy.

4. Turn off and disconnect PS#1, BS#1, Load#1, and voltmeters.

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Test Summary

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BQ25886 QFN Standalone boost-mode battery charger evaluation module

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2.2.3 Charge Mode Evaluation Results

Figure 2 shows the Charge Mode Startup graph.

Figure 2. Charge Mode Startup

VM#1

Battery

Simulator

or Power

Supply

BS#1

VM#2 VM#3

VM#4

AGND

V V

Resistive

or e-Load

Load#1

VM#5

Test Summary

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2.3 OTG Mode

2.3.1 OTG Mode Test Setup

Use the following list to set up the equipment for boost mode operation:

1. Ensure that the electronic load and battery simulator are turned off when connecting to the EVM.

shows the test setup for when in OTG mode, including the jumper settings per Table 2.

Figure 3. BQ25886 OTG Mode Test Setup

2. Voltmeters 1 through 3 (VM1, VM2, and VM3) connect to Kelvin test points for measuring VBUS, SYS,

and BAT as close to the IC pins as possible. Voltmeters 4 through 5 measure the voltage across 0.01

Ω, which gives the current.

3. Set BS#1 to 7.6 V and at a 6-A current limit, then turn off BS#1 and attach to the J4 (BAT, GND)

terminal of the EVM.

4. With electronic load disabled, attach to the J1 (VBUS, GND) terminal of the EVM.

5. Place shunt on JP8 to pull OTG pin high to enable OTG mode.

2.3.2 OTG Mode Test Procedure

Use the following steps for boost mode verification:

1. Measure on VM2 →V(TP1 (VBUS), TP26 (AGND)) = 5.1 V ±160 mV. Voltage of 10 mV is added to

account for DMM accuracy.

2. Set electronic load in CC mode to 500 mA, or resistive load to 10 Ω.

3. Measure on VM2 →V(TP1 (VBUS), TP26 (AGND)) = 5.1 V ±160 mV. Voltage of 10 mV is added to

account for DMM accuracy.

4. Turn off and disconnect BS#1, Load#1, and voltmeters.

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Test Summary

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2.3.3 OTG Mode Evaluation Results

Figure 4 shows the OTG Mode Startup graph.

Figure 4. OTG Mode Startup

Test Summary

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2.4 Helpful Tips

The following list provides a few helpful tips:

• The leads and cables to the various power supplies, batteries, and loads have resistance. The current

meters also have series resistance. The charger dynamically reduces charge current depending on the

voltage sensed at its VBUS pin (using the VINDPM feature), BAT pin (as part of normal termination),

and TS pin (through its battery temperature monitoring feature through the battery thermistor).

Therefore, the designer must use voltmeters to measure the voltage as close to the IC pins (TP7,

TP15, and TP16) as possible instead of relying on the digital readouts of the power supply.

• When using a source meter that can source and sink current as the battery simulator, TI highly

recommends adding a large (1000 μF or greater) capacitor at the EVM BAT and GND connectors to

prevent oscillations at the BAT pin, which are due to mismatched impedances of the charger output

and source meter input within their respective regulation loop bandwidths. Configuring the source

meter for four-wire sensing eliminates the requirement for a separate voltmeter to measure the voltage

at the BAT pin. When using four-wire sensing, always ensure that the sensing leads are connected to

prevent accidental overvoltage by the power supply.

• For precise measurements of efficiency and charge current or battery regulation (or both) near

termination, a current meter in series with the battery or battery simulator must not be set to auto-range

and may require removal, entirely. This EVM offers an alternate method for measuring currents by

measuring the voltage across a 1%, thermally-capable (for example, 0.010 Ωin a 1210 or larger

footprint) resistor in series between the power sources and power pins.

3 PCB Layout Guidelines

Minimize the switching node rise and fall times for minimum switching loss. Proper layout of the

components that minimize the high-frequency current path loop is important to prevent electrical and

magnetic field radiation and high-frequency resonant problems. To ensure proper layout, follow the priority

list for this printed-circuit board (PCB) in the order presented:

1. Place the output capacitor as close as possible to the SYS pin and GND pin connections and use the

shortest copper trace connection or GND plane.

2. Put the input capacitors near to the VBUS and PMID pins. Tie ground connections to the IC ground

with a short copper trace connection or GND plane.

3. Place the inductor input terminal as close to the SW pin as possible. Minimize the copper area of this

trace to lower electrical and magnetic field radiation but make the trace wide enough to carry the

charging current. Do not use multiple layers in parallel for this connection. Minimize parasitic

capacitance from this area to any other trace or plane.

4. Route analog ground separately from power ground. Connect analog ground and connect power

ground separately. Connect analog ground and power ground together using the power pad as the

single ground connection point or use a 0-Ωresistor to tie analog ground to power ground.

5. Use a single ground connection to tie the charger power ground to the charger analog ground just

beneath the IC. Use ground copper pour but avoid power pins to reduce inductive and capacitive noise

coupling.

6. Place decoupling capacitors next to the IC pins and make the trace connection as short as possible.

7. One critical note regarding the layout is that the exposed power pad on the backside of the IC package

must be soldered to the PCB ground. Ensure that there are sufficient thermal vias directly under the IC

connecting to the ground plane on the other layers.

8. The via size and number must be sufficient for a given current path.

See the EVM design for the recommended component placement with trace and via locations..

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