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bq29410, bq29411, bq29412 bq29413, bq29414 bq29415, bq29419
SLUS669G – AUGUST 2005 – REVISED AUGUST 2008
VO...
www.ti.com
bq29410, bq29411, bq29412 bq29413, bq29414 bq29415, bq29419
SLUS669G – AUGUST 2005 – REVISED AUGUST 2008
VOLTAGE PROTECTION FOR 2-, 3-, OR 4-CELL Li-Ion BATTERIES (2nd-LEVEL PROTECTION)
Check for Samples: bq29410, bq29411, bq29412, bq29413, bq29414, bq29415, bq29419
FEATURES
1
2-, 3-, or 4-Cell Secondary Protection Low Power Consumption ICC < 2 µA
[VCELL(ALL) < V(PROTECT)] Fixed High Accuracy Over
voltage Protection
Threshold – bq29410 = 4.35 V – bq29411 = 4.40 V – bq29412 = 4.45 V – bq29413 = 4.50 V – bq29414 = 4.55 V – bq29415 = 4.60 V – bq29419 = 4.30 V Programmable Delay Time of Detection High Power Supply Ripple Rejection Stable During Pulse Charge Operation
APPLICATIONS
2nd-Level Over
voltage Protection in Li-Ion Battery Packs in: – Notebook Computers – Portable Instrumentation – Portable Equipment
DESCRIPTION
The bq2941x is a secondary over
voltage protection IC for 2-, 3-, or 4-cell lithium-ion battery packs that incorporates a high-accuracy precision over
voltage detection circuit. It includes a programmable delay circuit for over
voltage detection time.
FUNCTION
Each cell in a multiple-cell pack is compared to an internal reference
voltage. If one cell reaches an over
voltage condition, the protection sequence begins. The bq2941x device starts charging an external capacitor through the CD pin. When the CD pin
voltage reaches 1.2 V, the OUT pin changes from a low level to a high level.
DCT PACKAGE (TOP VIEW)
OUT
1
VDD
2
CD
3
VC4
4
8
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