DS2726G+ Maxim Integrated Products, DS2726G+ Datasheet - Page 10

• Manufacturer Part Number: DS2726G+
• Description: IC PROT LI+ 5-10CELL 32-TQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS2726G+

• Function: Over/Under Voltage Protection
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 5 V ~ 50 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Overvoltage, OV. If any cell voltage (V
the overvoltage threshold, V
overvoltage delay, t
external charge FET. When V
charge-enable threshold V
charge FET on. The discharge FET remains enabled
during the overvoltage event. Care should be taken
while discharging during an OV condition because the
current drawn by the load is going through the body
diode of the CC FET.
Undervoltage, UV. If V
age threshold, V
age delay, t
discharge FETs and enters Sleep Mode. The device
remains in Sleep Mode until a charger is detected, at
which point the DS2726 wakes up and enables the CC
FET. The DC FET remains disabled until every cell is
above the V
while charging during a UV event because the charge
current is flowing through the body diode of the DC FET.
5-Cell to 10-Cell Li+ Protector with
Cell Balancing
Figure 3. Li+ Protection Circuitry Example Waveforms
10
______________________________________________________________________________________
DISCHARGE
CHARGE
POWER
MODE
V
V
CELL
SNS
CC
DC
UVD
UV_REL
, the DS2726 shuts off the charge and
UV
, for a period longer than undervolt-
t
OVD
threshold. Care should be taken
OVD
Li+ Protection Conditions
CELL
, the DS2726 shuts off the
OV
CE
t
drops below the undervolt-
SCD
, for a period longer than
, the DS2726 turns the
CELL
falls below the
t
CELL
OVD
) exceeds
t
OCD
Discharge Overcurrent, DOC. If V
V
shuts off the external discharge FET. The discharge
current path is not reestablished until V
V
I
removal of the offending low-impedance load. I
not disabled if an undervoltage condition is reached.
Short Circuit, SC. If V
od longer than short-circuit delay t
shuts off the external discharge FET. The discharge
current path is not reestablished until V
V
I
removal of the short. I
condition is reached.
Summary. All the protection conditions described are
logic ORed to affect the CC and DC outputs:
TST
TST
VIN
VIN
RDOC
DC = (Undervoltage) or (Discharge Overcurrent) or
(Short Circuit)
CC = (Overvoltage) or (Undervoltage and Charger
Detect)
- V
- V
from the PKP pin to the V
from the PKP pin to the V
TP
TP
for a period longer than t
. The DS2726 provides a test current of value
. The DS2726 provides a test current of value
t
t
UVD
UVD
TST
SNS
is disabled if an undervoltage
is less than V
IN
IN
DOCD
pin to detect the
pin to detect the
SCD
SNS
PKP
PKP
RSC
, the DS2726
, the DS2726
is less than
rises above
rises above
V
V
V
V
V
V
V
V
V
V
V
ACTIVE
SLEEP
OV
CE
UV_REL
UV
IN
RDOC
RSC
OHCC
OLCC
OHDC
OLDC
for a peri-
TST
is