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UCC3958DP-1 Datasheet(PDF) 5 Page - Texas Instruments

Part # UCC3958DP-1
Description  Single Cell Lithium-Ion Battery Protection Circuit
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC3958DP-1 Datasheet(HTML) 5 Page - Texas Instruments

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UCC3958 -1/-2/-3/-4
Over Current Monitoring and Protection
Discharge current is continuously monitored via an inter-
nal sense resistor. In the event of excessive current, an
Over Current condition is declared if the high current
state persists for over 350
µs. This delay allows for charg-
ing of the system bypass capacitors without tripping the
overcurrent. A delay of 350
µs guarantees that the pack
can charge up to 680
µF without declaring an Over Cur-
rent condition. The delay may be extended to charge
larger load capacitors by connecting an external delay
capacitor from the CDLY pin to one of the BNEG pins.
Once an Over Current condition has been declared, the
internal MOSFET turns off. The only way to return the
pack to normal operation is to remove the load by un-
plugging the pack from the system. The overcurrent is re-
set when an internal pull down brings PACK– to within
less than 0.05V above BNEG. At this point, the pack re-
turns to its normal state of operation. A capacitor on the
CBPS pin provides momentary holdup for the UCC3958
to assure proper operation in the event that a hard short
suddenly pulls the cell voltage below the minimum oper-
ating voltage. This cap value can be 0.15
µF if the op-
tional CDLY capacitor is not used. An internal 10k
resistor buffers the bypass capacitor from the Li-Ion cell.
System Status Indicators
The UCC3958 provides several convenient system moni-
toring signals. The first one is the Low Power Warning.
This output goes high when the cell voltage is less than
300mV above the Under Voltage Threshold. It signals
the system that the battery is getting close to its dis-
charge limit.
The second monitoring signal is a tri-statable OV/UV out-
put. Under normal operations conditions, this signal is
tri-stated. When an Over Voltage condition is declared,
the output is pulled high. When an Under Voltage condi-
tion is declared, the output is pulled low. This signal is
especially useful during test, allowing easy verification of
the OV and UV thresholds. These outputs are with re-
spect to BNEG.
0
400
800
1200
1600
2000
4.0
5.0
6.0
7.0
8.0
9.0
10.0
CHARGER VOLTAGE (V)
APPLICATION INFORMATION (continued)
Figure 2. Typical OV Leakage Current with Runaway
Charger at 25°C
Figure 3. State Diagram
UDG-98051

#

#

#
!

"
$&

CDLYCAP VALUE(pf)
Figure 4. Typical Overcurrent Delay Time vs CDLY


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