ne57610 NXP Semiconductors, ne57610 Datasheet - Page 10

• Manufacturer Part Number: ne57610
• Description: Li-ion Battery Charger Control With Adjustable Thresholds
• Manufacturer: NXP Semiconductors

Philips Semiconductors
NE57610 OPERATION
The typical application schematic is given in Figure 17. Because in
a multiple-cell battery pack, the battery charger cannot access the
connection(s) between the cells within a battery pack, the following
discussion is based upon the calculated value of each cell’s voltage
(V
Start of charging
The start of the charging process is only permitted when all of the
following conditions are met:
The charging behavior depends on the voltage of the battery. If the
initial cell voltage is:
< 2.0 V (V
into the battery pack and the undervoltage charge timer is set. If the
battery pack voltage does not reach 2.3 V (or V
period of time, the pack is assumed to be damaged and the
charging process is terminated. The charger can be restarted by
bringing RESET momentarily high, or by turning-OFF and then ON
the input voltage.
2002 Nov 05
batt
The DC input voltage is greater than V
is sufficient input voltage.
The battery voltage is less than the overcharged voltage (V
The reset and ON/OFF pins are both LOW.
The battery temperature voltage falls within its recommended
operating range.
Li-ion battery charger control
with adjustable thresholds
/number of series cells).
LV
) (overdischarged): A 1 mA charge current is sent
+V
–V
in
in
10 F
RED
ADPH
150
R
GRN
C
OSC
T
, which indicates there
UV
Figure 17. Typical application circuit (2-cell).
24
22
21
23
) in this preset
RED
GRN
OSC1
OSC2
ON/OFF RESET GND PGND
V
CC
18
2
BCP51
NE57610
ov)
DRV
17
1
PBYR
240CT
6
10
CS
BAT1
BAT2
V
15
TMP
TP1
TP2
2.3V (V
1
battery pack. This continues until the cell voltage reaches 2.9 V. If
the pre-charge timer, times out prior to the cell reaching 2.9 V, the
pre-charge is terminated. The charger can be restarted by bringing
RESET momentarily high, or by turning-OFF and then ON the input
voltage.
2.9 V (V
placed into the battery pack until the cell reaches a full-charge
condition by either reaching V
full-charge level within the period of the charge timer, the charge is
terminated.
V
completely cut off. If the battery pack is allowed to remain on the
charger for an extended period, and if the pack voltage falls to 3.9 V
per cell due to self-discharge, charging begins again at the full rate
of charge until V
long as the battery is in the charger.
Overriding conditions
If, under any of the above conditions, the following conditions are
encountered, the charging process will be immediately terminated.
A State diagram of the various modes of the charger can be seen in
Figure 18.
REF
/
7
batt
8
If the temperature sensing input is lower than V
V
with higher temperatures)
If the timer associated with the presently active function times out.
R
th
CS
TL
13
14
3
4
5
12
the normal charge current (pre-charge) is placed into the
> 4.35 V (V
voltages. (remember, a thermocouple’s voltage goes down
UV
P
TP1
TP2
) < V
) < V
batt
batt
OV
OV
V+
V–
< 4.35 V (V
< 2.9 V (V
) (fully charged): The charge current is
or V
BATTERY PACK
THERM
F
CELL 2
CDLL 1
is reached again. This process repeats as
P
OV
OV
): A charge current of approximately
SL01863
): The high-rate charge current is
or V
F
. If the cell does not reach the
NE57610
TH
or higher than
Product data