Texas Instruments BQ24123 Evaluation Module BQ24123EVM-002 BQ24123EVM-002 Datenbogen
Produktcode
BQ24123EVM-002
1
Introduction
1.1
Background
1.2
Performance Specification Summary
User's Guide
SLUU236A – March 2006 – Revised November 2007
Using the bq2412x (bqSWITCHER™) EVM
This user's guide describes the bq2412x (bqSWITCHER™) evaluation module (EVM) for part numbers
bq24120, bq24123, and bq24125. The EVM helps you evaluate the performance of a charge management
solution for portable applications using the bq24120x product family. A complete, designed, and tested
charger is presented. The charger can deliver up to 2 A of continuous output current and is programmed
from the factory to deliver 1.33 A of charging current. Follow the instructions in this user's guide that
pertain to the specific bq2412x EVM to be evaluated (one-, two- or three-cell). See the bqSWITCHER data
sheet (
bq24120, bq24123, and bq24125. The EVM helps you evaluate the performance of a charge management
solution for portable applications using the bq24120x product family. A complete, designed, and tested
charger is presented. The charger can deliver up to 2 A of continuous output current and is programmed
from the factory to deliver 1.33 A of charging current. Follow the instructions in this user's guide that
pertain to the specific bq2412x EVM to be evaluated (one-, two- or three-cell). See the bqSWITCHER data
sheet (
) prior to evaluation for detailed information on the bqSWITCHER devices.
The bqSWITCHER™ series are highly integrated Li-ion and Li-polymer switch-mode charge management
devices targeting a wide range of portable applications. The bqSWITCHER series offers integrated
synchronous PWM controller and power FETs, high-accuracy current and voltage regulation, charge
conditioning, charge status, and charge termination, in a small thermally-enhanced QFN package. The
system-controlled version provides additional input for full charge management under system control.
devices targeting a wide range of portable applications. The bqSWITCHER series offers integrated
synchronous PWM controller and power FETs, high-accuracy current and voltage regulation, charge
conditioning, charge status, and charge termination, in a small thermally-enhanced QFN package. The
system-controlled version provides additional input for full charge management under system control.
The bqSWITCHER charges the battery in three phases: conditioning, constant current, and constant
voltage. Charge is terminated based on user-selected minimum current level. A programmable charge
timer provides a backup safety for charge termination. The bqSWITCHER automatically restarts the
charge if the battery voltage falls below an internal threshold. The bqSWITCHER automatically enters
sleep mode when V
voltage. Charge is terminated based on user-selected minimum current level. A programmable charge
timer provides a backup safety for charge termination. The bqSWITCHER automatically restarts the
charge if the battery voltage falls below an internal threshold. The bqSWITCHER automatically enters
sleep mode when V
CC
supply is removed.
This is a bq24120x EVM performance specifications summary (
). The TS pin has been disabled for
easier charging evaluation by fixing its voltage to a set value. See the EVM schematic (
) and
for information about changing the R10 and R11 values to use with an external thermistor.
Table 1. Performance Specification Summary
SPECIFICATION
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input DC voltage, V
I(DC)
V
REG
+0.6
5
16
V
Battery charge current, I
O(CHG)
1.33
2
A
Power dissipation
bq24120
4.5 V
≤
V
IN
≤
16 V, V
(BAT)
= 4.2 V, I
OUT
= 1.33 A
0.6
W
(1 cell)
bq24123
4.5 V
≤
V
IN
≤
16 V, V
(BAT)
= 4.2 V, I
OUT
= 1.33 A
0.6
W
(1 cell)
bq24123
9 V
≤
V
IN
≤
16 V, V
(BAT)
= 8.4 V, I
OUT
= 1.33 A
0.85
W
(2 cells)
bg24125
4.5 V
≤
V
IN
≤
16V, V
(BAT)
= 4.2V, I
OUT
= 1.33A
0.6
W
(1 cell)
bg24125
9 V
≤
V
IN
≤
16V, V
(BAT)
= 8.4V, I
OUT
= 1.33A
0.85
W
(2 cells)
bg24125
13.5 V
≤
V
IN
≤
16V, V
(BAT)
= 12.6V, I
OUT
= 1.33A
1.17
W
(3 cells)
bqSWITCHER is a trademark of Texas Instruments.
SLUU236A – March 2006 – Revised November 2007
Using the bq2412x (bqSWITCHER™) EVM
5