S-8254AALFT-TB-G Seiko Instruments, S-8254AALFT-TB-G Datasheet - Page 15

• Manufacturer Part Number: S-8254AALFT-TB-G
• Description: IC LI-ION BATT PROTECT 16-TSSOP
• Manufacturer: Seiko Instruments

Specifications of S-8254AALFT-TB-G

• Function: Over/Under Voltage Protection
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 2 V ~ 24 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Output Voltage: 4.3 V
• Operating Supply Voltage: 2 V to 24 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Rev.5.0
5. Overcurrent Status
6. 0 V Battery Charge Function
7. Delay Time Setting
8. CTL Pin
The S-8254A Series has three overcurrent detection levels (V
detection delay times (t
discharging current becomes higher than the specified value (the voltage between V
than V
which the DOP pin voltage becomes V
COP pin becomes high impedance and is pulled up to the EB+ pin voltage to turn off the charging FET to
stop charging, and the VMP pin is pulled up to the V
of overcurrent detection level 2 (V
V
In the overcurrent status, the VMP pin is pulled up to the V
resistor). The overcurrent status is released when the following condition holds.
Regarding the charging of a self-discharged battery (0 V battery), the S-8254A Series has two functions
from which one should be selected.
Caution When the VDD pin voltage is lower than the minimum value of V
The overcharge detection delay time (t
pin. The overdischarge detection delay time (t
determined by the external capacitor connected to the CDT pin. Overcurrent detection delay times 2 and
3 (t
The S-8254A Series has control pins. The CTL pin is used to control the COP and DOP pin output
voltages. CTL pin takes precedence over the battery protection circuit.
Caution Please note unexpected behavior might occur when electrical potential difference
IOV1
t
t
t
(1) The VMP pin voltage is V
(1) 0 V battery charging is allowed (0 V battery charging is available.)
(2) 0 V battery charging is prohibited (0 V battery charging is unavailable.)
IOV2
CU
DL
IOV1
_01
and t
[s] =
[s] = (5.00, 10.0, 15.0) × C
IOV1
, t
When the charger voltage is higher than V
When one of the battery voltages is lower than V
[s] = (0.05, 0.10, 0.15) × C
more) is released.
IOV3
S-8254A Series is not guaranteed.
) and the state continues for t
IOV1
between the CTL pin (‘L’ level) and VSS is generated through the external filter
(R
) are fixed internally.
(0.50, 1.00, 1.50) × C
VSS
.
BATTERY PROTECTION IC FOR 3-SERIAL- OR 4-SERIAL-CELL PACK
min. typ.
and C
*1. The status is controlled by the voltage detector.
IOV1
VSS
CTL Pin
Open
, t
High
Low
) as a result of input voltage fluctuations.
max.
IOV2
Table 5 Conditions Set by CTL Pin
, and t
IOV3
IOV2
CCT
CDT
CDT
Normal status
) and overcurrent detection delay time 2 (t
Seiko Instruments Inc.
IOV3
or higher because a charger is connected or the load (30 MΩ or
IOV1
CU
DD
[μF]
[μF]
[μF]
COP Pin
) is determined by the external capacitor connected to the CCT
High-Z
High-Z
) corresponding to each overcurrent detection level. When the
level to turn off the discharging FET to stop discharging, the
or longer, the S-8254A Series enters the overcurrent status, in
0CHA
DL
) and overcurrent detection delay time 1 (t
*1
DD
, the 0 V battery can be charged.
voltage by the internal resistor (R
0INH
Normal status
, the 0 V battery cannot be charged.
DD
DOP Pin
IOV1
level by the internal resistor in the IC (R
V
V
DD
DD
, V
IOV2
, and V
*1
IOV3
DSOP
IOV2
) and three overcurrent
, the operation of the
S-8254A Series
SS
) is the same as for
and V
VMD
). Operation
INI
is greater
IOV1
) are
VMD
15