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BQ2004E Fast-Charge ICs
Prototype PCB
Part No.:   BQ2004E
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Description:   Fast-Charge ICs
File Size :   295 K    
Page : 19 Pages
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100%
bq2004E/H
VSEL Input
Low
Float
High
Voltage Termination
Disabled
-∆V
PVD
∆T/∆t
Termination
The bq2004E/H samples at the voltage at the TS pin
every 34s, and compares it to the value measured two
samples earlier. If V
TEMP
has fallen 16mV
±4mV
or
more, fast charge is terminated. The
∆T/∆t
termination
test is valid only when V
TCO
< V
TEMP
< V
LTF
.
Voltage Sampling
Each sample is an average of voltage measurements.
The IC takes 32 measurements in PVD mode and 16
measurements in -∆V mode. The resulting sample peri-
ods (9.17ms and 18.18ms, respectively) filter out har-
monics centered around 55Hz and 109Hz. This tech-
nique minimizes the effect of any AC line ripple that
may feed through the power supply from either 50Hz or
60Hz AC sources. Tolerance on all timing is
±16%.
Temperature Sampling
Each sample is an average of 16 voltage measurements.
The resulting sample period (18.18ms) filters out har-
monics around 55Hz. This technique minimizes the ef-
fect of any AC line ripple that may feed through the
power supply from either 50Hz or 60Hz AC sources. Tol-
erance on all timing is
±16%.
Temperature and Voltage Termination
Hold-off
A hold-off period occurs at the start of fast charging.
During the hold-off period, -∆V and
∆T/∆t
termination
are disabled. The MOD pin is enabled at a duty cycle of
260µs active for every 1820µs inactive. This modulation
results in an average rate 1/8th that of the fast charge
rate. This avoids premature termination on the voltage
spikes sometimes produced by older batteries when
fast-charge current is first applied. Maximum voltage
and maximum temperature terminations are not af-
fected by the hold-off period.
Maximum Voltage, Temperature, and Time
Anytime V
CELL
rises above V
MCV,
the LEDs go off and cur-
rent flow into the battery ceases immediately. If V
CELL
then falls back below V
MCV
before t
MCV
= 1.5s
±0.5s,
the
chip transitions to the Charge Complete state (maximum
voltage termination). If V
CELL
remains above V
MCV
at the
expiration of t
MCV,
the bq2004E/H transitions to the Bat-
tery Absent state (battery removal). See Figure 3.
Maximum temperature termination occurs anytime
V
TEMP
falls below the temperature cutoff threshold
V
TCO
. Charge will also be terminated if V
TEMP
rises
above the low temperature fault threshold, V
LTF
, after
fast charge begins.
Table 1. Fast Charge Safety Time/Hold-Off/Top-Off Table
Corresponding
Fast-Charge
Rate
2004E
C/4
C/2
1C
2C
4C
C/2
1C
2C
4C
2004H
C/8
C/4
C/2
1C
2C
C/4
C/2
1C
2C
TM1
Low
Float
High
Low
Float
High
Low
Float
High
TM2
Low
Low
Low
Float
Float
Float
High
High
High
Typical
Fast-Charge
Safety
Time (min)
2004E
325
154
77
39
19
154
77
39
19
2004H
650
325
154
77
39
325
154
77
39
Typical
PVD, -∆V
Hold-Off
Time (s)
2004E
137
546
273
137
68
546
273
137
68
Pulse-
Trickle
Period (Hz)
2004E
2004H
Top-Off
Rate
2004H
2004H 2004E
273
546
546
273
137
546
546
273
137
Pulse-
Trickle
Rate
Disabled
C/512
C/512
C/512
C/512
C/512
C/512
C/512
C/512
Disabled
Disabled
Disabled
Disabled
Disabled
C/16
C/8
C/4
C/2
C/32
C/16
C/18
C/4
Disabled
15
7.5
3.75
1.88
15
7.5
3.75
1.88
30
15
7.5
3.75
30
15
7.5
3.75
Note:
Typical conditions = 25°C, V
CC
= 5.0V.
5
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