SLUU200 − July 2004
5
Using the bq241xx (bqSWITCHER
E
)
1.2
Performance Specification Summary
This section summarizes the performance specifications of the EVM. Table 1 gives the performance
specifications of the EVM. The TS pin has been disabled, for easier charging evaluation, by fixing its voltage
to a set value. See EVM schematic and data sheet for information on how to change R10 and R11 values to
use with an external thermistor
Table 1. Performance Specification Summary
(1)
SPECIFICATION
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input DC voltage, VI(DC)
VREG + 0.6
5.0
16
V
Battery charge current(1), IO(CHG)
1.33
2.0(1)
A
bq24100
(1 cell)
5 V
≤
VIN
≤
16 V, V(BAT) = 4.2 V, IOUT = 1.33 A
0.6
bq24103
bq24113
(1 cell)
5 V
≤
VIN
≤
16 V, V(BAT) = 4.2 V, IOUT = 1.33 A
0.6
bq24103
bq24113
(2 cell)
9 V
≤
VIN
≤
16 V, V(BAT) = 8.4 V, IOUT = 1.33 A
0.85
Power dissipation
bq24105
bq24115
(1 cell)
5 V
≤
VIN
≤
16 V, V(BAT) = 4.2 V, IOUT = 1.33 A
0.6
W
bq24105
bq24115
(2 cell)
9 V
≤
VIN
≤
16 V, V(BAT) = 8.4 V, IOUT = 1.33 A
0.85
bq24105
bq24115
(3 cell)
13.5 V
≤
VIN
≤
16 V, V(BAT) = 12.6 V, IOUT = 1.33 A
1.17
2
Test Summary
This chapter covers the test setups and tests performed, in evaluating the EVM.
2.1
Equipment
D
Power Source: Current limited 15-V lab supply with its current limit set to 25% above the programmed
charging current (1.7 A for setup from factory). This is basically a safety limit. The actual DC input current
should be less than the charging current.
D
Two Fluke 75: (optional) To measure input and output voltage and drop across current sense resistor.
2.2
Setup
The bq241xx EVM board requires a regulated supply approximately 0.3 V minimum above the regulated voltage
of the battery pack (1-cell pack: 4.2 V; 2-cell pack: 8.4 V; 3-cell pack: 12.6 V) to a maximum input voltage of
16 V
DC
.
A one- to three-cell battery pack is needed for EVM evaluation. The EVM should be chosen and set up to charge
the same numbers of cells as the battery pack to be evaluated. See Table 2.
Setup the EVM as shown in Table 2. Preset the input supply to the desired voltage, turn off supply and then
connect supply to J1. Set the supply’s current limit 25% above the programmed charging current. The test setup
connections and jumper setting selections are configured for a stand-alone evaluation but can be changed to
interface with external hardware such as a microcontroller. Refer to schematic and data sheet for additional
functional information on other optional connections.
