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| BQ2961_17 Datasheet, PDF (11/33 Pages) Texas Instruments – Overvoltage Protection for 2-Series, 3-Series, and 4-Series Cell Li-Ion Batteries with Regulated Output Supply | |||
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8 Detailed Description
bq2961, bq2962
SLUSBU5D â NOVEMBER 2013 â REVISED JANUARY 2017
8.1 Overview
The bq2960, bq2961 and bq2962 are second-level overvoltage (OV) protectors with a regulated output. Each cell
is monitored independently by comparing the actual cell voltage to an overvoltage threshold VOV. The
overvoltage threshold is preprogrammed at the factory with a range between 3.85 V to 4.65 V.
The regulated output is enabled unless any of the cell voltages fall below the VUVREG threshold. This threshold is
preprogrammed at the factory with a range between 2 V to 2.8 V. For bq2960xy family, an external control pin,
REG_EN, is available to enable or disable the regulated output in addition to the VUVREG detection.
OVERVOLTAGE RANGE (V)
3.85 to 4.6 in 50 mV step
Table 3. Programmable Parameters
OVERVOLTAGE DELAY (s)
3, 4, 5.5, 6.5
UNDERVOLTAGE RANGE (V)
2.0 to 2.8 in 50 mV step
REGULATOR (V)
1.8, 2.5, 3.3 (bq2960, bq2961)
3.0, 3.15, 3.3 (bq2962)
8.2 Functional Block Diagram
R IN
V3
2
C IN
R IN
V2
3
C IN
RIN
V1
4
C IN
VSS
6
R VD
VDD
1
C VD
UVP_Vref
Comp
+
-
Vref
+
Amp
-
V OV
Enable
Programmable
setting
Delay Charging/
Discharge circuit
Delay
Timer
PACK+
5 REG_EN
7 REG
Active
OUT
8
9
PWPD
Figure 9. bq2960 Block Diagram
PACK±
Copyright © 2013â2017, Texas Instruments Incorporated
Product Folder Links: bq2961 bq2962
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