ST STEVAL-ISB041V1 Manuel utilisateur

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March 2017

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www.st.com

UM2185

User manual

Getting started with the STEVAL-ISB041V1 Li-Ion/Li-Po battery

power management evaluation board based on STBC02

Introduction

The STEVAL-ISB041V1 evaluation board is based on STBC02 Li-Ion and Li-Po linear battery

management device, integrating a CC-CV charger algorithm, an always-on LDO, smart-reset Watchdog,

a protection circuit module (PCM) and a dual SPDT switch matrix.

The device is able to charge batteries at a 450 mA continuous maximum current with few external

passive components, so the whole application can be reduced down to as little as 4.5 mm x 5 mm.

The module can deliver 60 mA charging current and supply the system up to 300 mA while powered by

a standard 5 V output DC power supply. It is suitable for battery operated equipment, wearable devices,

fitness portable devices, MP3 players, healthcare and medical instrumentation, body worn equipment,

etc.

Figure 1: STEVAL-ISB041V1 evaluation board

Contents

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Contents

1Getting started................................................................................. 5

1.1 Board overview .................................................................................5

1.2 Input/output connectors.....................................................................5

1.3 Test procedure and technical recommendations...............................7

1.3.1 Recommended equipment ................................................................. 7

1.3.2 Procedure to test a typical full charging cycle .................................... 8

2GND pins........................................................................................ 10

3Schematic diagram........................................................................ 14

4PCB layout ..................................................................................... 15

5STBC02: block diagram and ballout ............................................ 16

6Revision history ............................................................................ 19

Appendix A General handling precautions.................................. 20

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List of tables

Table 1: Input/output connector: pin description.........................................................................................5

Table 2: STEVAL-ISB041V1 evaluation board pin functions ...................................................................10

Table 3: Ball description............................................................................................................................17

Table 4: Document revision history ..........................................................................................................19

List of figures

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List of figures

Figure 1: STEVAL-ISB041V1 evaluation board..........................................................................................1

Figure 2: STEVAL-ISB041V1 evaluation board pinout...............................................................................7

Figure 3: STBC02 battery proper connection and routing ........................................................................11

Figure 4: Hall current probe ......................................................................................................................12

Figure 5: STEVAL-ISB041V1 circuit schematic........................................................................................14

Figure 6: STEVAL-ISB041V1 PCB layout: top side..................................................................................15

Figure 7: STEVAL-ISB041V1 PCB layout: bottom side............................................................................15

Figure 8: STBC02 block diagram..............................................................................................................16

Figure 9: STBC02 (flipchip30, 2.25 mm x 2.59 mm package): ballout, top view......................................16

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1 Getting started

1.1 Board overview

The STEVAL-ISB041V1 evaluation board size is 50 mm x 50 mm.

The PCB is made by using FR4 glass epoxy support with 4 copper layers.

The device features:

Charges single-cell Li-Ion/Li-Po batteries with CC-CV algorithm and charge

termination

Fast charge current programmable from 1 mA to 450 mA

Pre-charge current programmable from 1 mA to 450 mA

Adjustable floating voltage up to 4.45 V

Integrated always-on low quiescent LDO regulator

Battery over-charge and over-discharge protections

Overcurrent protection

Shipping mode exit input

Integrated dual 3 Ω SPDT load switches

Integrated smart reset / watchdog logic

Single wire control interface

RoHS compliant

1.2 Input/output connectors

The input/output connectors (J1-J23) provide the necessary probing signals:

Kelvin connection points for input and output voltage;

enable signal input;

multiple GND connection;

s-wire input

Table 1: Input/output connector: pin description

Connector

number

Symbol

Signal name

Pin description

CEN

Charger enable pin

RESET_NOW

Smart reset input signal

S-w

SW_SEL

Serial s-wire input

CEN

Charger enable pin

CHG

Charging/fault flag

Wup

Wake-Up

Shipping mode exit input

MS2

Reserved

MS3

Reserved

nRES

Smart reset output signal

rPEND

Smart reset output signal

ISET

Fast-charge current

programming resistor

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Connector

number

Symbol

Signal name

Pin description

IPRE

Pre-charge current

programming resistor

LDO

LDO output

LDO_S

LDO

LDO output sensing

Input supply voltage

IN_S

Input supply voltage

sensing

J10

BAT_S

BAT

Battery sensing

BAT

Battery - positive terminal

----

Reserved

NTC

Battery temperature

monitor pin

J11

SYS

System output

SYS_S

SYS

System output sensing

J13

BATMS

Battery voltage

measurement pin

J15

1_I

SW1_I

1_OA

SW1_OA

1_OB

SW1_OB

2_I

SW2_I

2_OA

SW2_OA

2_OB

SW2_OB

J19

VBUS

----

Input supply voltage

J23

BATSNS

BAT

Battery voltage sensing

BATSNSFV

Floating voltage sensing

J1, J3, J7, J8, J9, J10,

J11, J13, J15, J23

GND

Ground connection

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Figure 2: STEVAL-ISB041V1 evaluation board pinout

1.3 Test procedure and technical recommendations

STBC02 linear battery management IC is designed to manage the whole battery charging

procedure, powering the system through the power path node output (SYS unregulated

voltage rail) via a low quiescent linear regulator output.

Being a linear device, the charger is most efficient when the input voltage is only slightly

above the battery voltage (VIN = 4.55 to 5.4 V).

A low input voltage (inferior to the sum of the OUT voltage plus the dropout voltage) results

in degraded performance. Excessive input voltage (>5.4 V) results in power dissipation and

reduced performance (it halves the charge current if thermal warning is reached) due to the

IC thermal management protection circuit.

The IC is set to 16 V and is not damaged with a lower VIN voltage, but it is disabled by any

VIN voltage over the overvoltage protection threshold (5.9 V).

Section 1.3.2: "Procedure to test a typical full charging cycle" describes the procedure to

test and observe a typical full charging cycle. The CC-CV algorithm is linked to the battery

voltage level. If a battery having VBAT>3 V is plugged, the pre-charge phase is skipped and

the device directly enters in fast charge mode.

1.3.1 Recommended equipment

Bench power supply (+5 VDC) with current limit set to ~1-2 A or USB wall adaptor with

micro USB plug;

oscilloscope with one current and three high impedance voltage probes;

programmable digital waveform generator (or standard MCU to implement digital

sequence).

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1.3.2 Procedure to test a typical full charging cycle

The three most important STBC02 functional modes are:

battery mode: VBAT valid range, system up and running, VIN invalid range;

shutdown mode: device supplied by battery but in shutdown mode;

VIN mode: VIN valid range present.

The charger is designed to be used with Li-Ion batteries (Li-Ion nominal battery voltage is

3.7-3.8V). VBAT range is 0 (dead battery) to 4.5 V (overcharged battery). The device input

operating supply voltage is 4.5 to 5.5 VDC.

The procedure to demonstrate this power path charger is:

Connect one high impedance probe to J1/pin6 (CHG) vs GND.

Connect one high impedance probe to J10/pin2 (BAT_S) vs. GND.

Place the current probe on the positive battery terminal wire.

Connect (fully discharged) battery (e.g. 2.5 V) to J10/pin3 (VBAT) vs. GND.

Connect power supply ~5.0 V to J9/pin3 (IN) vs GND.

Battery starts charging by IPRE charging current. Verify that IBAT is ~6 mA (10%

of IFAST).

Connect a 33 Ω, ½-W resistor to J8/pin3 (LDO) vs. GND.

With a high impedance probe, verify that LDO (node LDO_S - J8/pin2) output is 3.1

CHG toggles (6 Hz).

When battery voltage level exceeds VPRE (3 V), the charging current changes

from IPRE to IFAST and increases to ~ 60 mA (IFAST setup). During this phase,

CHG is still toggling at the same frequency if no warning/alarm is detected. In this

condition, LDO and system are powered by the power supply.

Verify with high impedance probe that SYS voltage (J11/pin2) is approximately 5 V

(IN node level minus internal MOS drop).

You can stop the charging cycle by a jumper to short CEN to GND (short J1/pin2 to

J1/pin1) just to verify CEN pin is functional.

Verify that the charger stops.

CHG changes state and its level goes low.

Remove short CEN to GND to continue charging.

Charge the battery fully

At a certain battery level (typical 4.2 V), charging current starts falling and battery

voltage level remains constant at VFLOAT level.

Battery charging is automatically stopped when battery charging current drops

under 5 % of IFAST.

Disconnect charger to observe device behavior in battery mode.

Battery starts discharging to supply the load connected to LDO output; the current

probe measures a negative value (~VLDO/resistive load).

Verify through high impedance probe that SYS_S voltage (J11/pin2) is VBAT voltage

minus VBAT equal to VSYS MOSFET RDSON multiplied by load current.

Remove resistive load from the LDO output.

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Disconnect and reconnect battery.

SYS and LOD node are not supplied now, as the device is in shutdown mode. To

enter battery mode, you have to pull WakeUp pin to VBAT level (to be precise, the

WakeUp pin has to exceed 3.0 V level).

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