ST STEVAL-ISB041V1 User manual

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March 2017
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www.st.com
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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
Pin
number
Symbol
Signal name
Pin description
J1
2
D
CEN
Charger enable pin
3
C
RESET_NOW
Smart reset input signal
4
S-w
SW_SEL
Serial s-wire input
5
CEN
CEN
Charger enable pin
6
CHG
CHG
Charging/fault flag
7
Wup
Wake-Up
Shipping mode exit input
pin
J3
2
MS2
Reserved
3
MS3
Reserved
4
nRES
Smart reset output signal
5
rPEND
Smart reset output signal
J7
2
ISET
ISET
Fast-charge current
programming resistor

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Connector
Pin
number
Symbol
Signal name
Pin description
3
IPRE
IPRE
Pre-charge current
programming resistor
J8
2
LDO
LDO
LDO output
3
LDO_S
LDO
LDO output sensing
J9
2
IN
IN
Input supply voltage
3
IN_S
IN
Input supply voltage
sensing
J10
2
BAT_S
BAT
Battery sensing
3
BAT
BAT
Battery - positive terminal
4
----
----
Reserved
5
NTC
NTC
Battery temperature
monitor pin
J11
2
SYS
SYS
System output
3
SYS_S
SYS
System output sensing
J13
2
BATMS
BATMS
Battery voltage
measurement pin
J15
2
1_I
SW1_I
3
1_OA
SW1_OA
4
1_OB
SW1_OB
5
2_I
SW2_I
6
2_OA
SW2_OA
7
2_OB
SW2_OB
J19
VBUS
----
IN
Input supply voltage
J23
2
BATSNS
BAT
Battery voltage sensing
3
BATSNSFV
BATSNSFV
Floating voltage sensing
J1, J3, J7, J8, J9, J10,
J11, J13, J15, J23
1
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:
1
Connect one high impedance probe to J1/pin6 (CHG) vs GND.
2
Connect one high impedance probe to J10/pin2 (BAT_S) vs. GND.
3
Place the current probe on the positive battery terminal wire.
4
Connect (fully discharged) battery (e.g. 2.5 V) to J10/pin3 (VBAT) vs. GND.
5
Connect power supply ~5.0 V to J9/pin3 (IN) vs GND.
6
Battery starts charging by IPRE charging current. Verify that IBAT is ~6 mA (10%
of IFAST).
7
Connect a 33 Ω, ½-W resistor to J8/pin3 (LDO) vs. GND.
8
With a high impedance probe, verify that LDO (node LDO_S - J8/pin2) output is 3.1
V.
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.
9
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.
10
Verify that the charger stops.
CHG changes state and its level goes low.
11
Remove short CEN to GND to continue charging.
12
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.
13
Battery charging is automatically stopped when battery charging current drops
under 5 % of IFAST.
14
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).
15
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.
16
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).