DS2764AE+ Maxim Integrated Products, DS2764AE+ Datasheet - Page 10

• Manufacturer Part Number: DS2764AE+
• Description: IC MON BATT LI-ION HP 16-TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of DS2764AE+

• Function: Battery Monitor
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Overcurrent, Charge Direction. The voltage difference between the IS1 pin and the IS2 pin (V
filtered voltage drop across the current-sense resistor. If V
than overcurrent delay t
register. The charge current path is not re-established until the voltage on the PLS pin drops below V
DS2764 provides a test current of value I
offending charge current source.
Overcurrent, Discharge Direction. If V
external discharge FET and sets the DOC flag in the protection register. The discharge current path is not re-
established until the voltage on PLS rises above V
V
Short Circuit. If the voltage on the SNS pin with respect to V
longer than short-circuit delay t
protection register. The discharge current path is not re-established until the voltage on PLS rises above V
The DS2764 provides a test current of value I
circuit.
Figure 4. Li+ Protection Circuitry Example Waveforms
Summary. All of the protection conditions described above are OR’ed together to affect the CC and DC outputs.
Soft Startup. The discharge protection FET is turned on slowly when the DS2764 enters Active mode from Sleep.
The soft startup reduces the inrush current that normally occurs when a battery pack is inserted into an un-powered
host system. Soft Startup does not reduce inrush currents if the DS2764 is already in Active mode when the
battery pack is connected to the un-powered system.
DD
DISCHARGE
to PLS to pull PLS up to detect the removal of the offending low-impedance load.
CHARGE
DC = (Undervoltage) or (Overcurrent, Either Direction) or (Short Circuit) or (Protection Register Bit DE = 0)
CC = (Overvoltage and V
MODE
NOTE 1: TO ALLOW THE DEVICE TO REACT QUICKLY TO SHORT CIRCUITS, DETECTION OCCURS ON THE SNS PIN RATHER THAN ON THE
FILTERED IS1 AND IS2 PINS. THE ACTUAL SHORT-CIRCUIT DETECT CONDITION IS V
V
CELL
or (Sleep Mode)
Register bit CE = 0) or (Sleep Mode)
CC
DC
V
IS
t
OVD
OCD
, the DS2764 shuts off both external FETs and sets the COC flag in the protection
t
SCD
SCD
IS
≥ -2mV) or (Undervoltage) or (Overcurrent, Charge Direction) or (Protection
, the DS2764 shuts off the external discharge FET and sets the DOC flag in the
(NOTE 1)
IS
is less than -V
t
TST
OVD
TST
from PLS to V
from V
DD
t
10 of 20
OCD
- V
DD
OC
TP
IS
to PLS to pull PLS up to detect the removal of the short
. The DS2764 provides a test current of value I
for a period longer than t
exceeds overcurrent threshold V
SS
SS
t
OCD
to pull PLS down to detect the removal of the
exceeds short-circuit threshold V
SNS
> V
SC
.
OCD
t
UVD
, the DS2764 shuts off the
OC
IS
for a period longer
= V
SC
IS1
DD
-V
V
V
V
V
V
-V
V
V
V
ACTIVE
SLEEP
for a period
0
- V
SS
OV
CE
UV
OC
PLS
SS
DD
OC
SC
- V
IS2
DD
TST
TP
) is the
- V
. The
from
TP
.