BQ7718 Datasheet, PDF (1/28 Pages) Texas Instruments – Overvoltage Protection for 2-Series to 5-Series Cell Li-Ion Batteries with Internal Delay Timer

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bq7718
SLUSAX1E – DECEMBER 2012 – REVISED MARCH 2017
bq7718 Overvoltage Protection for 2-Series to 5-Series Cell Li-Ion Batteries
with Internal Delay Timer
1 Features
•1 2-, 3-, 4-, and 5-Series Cell Overvoltage
Protection
• Internal Delay Timer
• Fixed OVP Threshold
• High-Accuracy Overvoltage Protection:
± 10 mV
• Low Power Consumption I_CC ≈ 1 µA
(V_CELL(ALL) < V_PROTECT)
• Low Leakage Current Per Cell Input < 100 nA
• Small Package Footprint
– 8-pin QFN (3.00 mm × 4.00 mm)
2 Applications
• Protection in Li-Ion Battery Packs in:
– Power Tools
– UPS Battery Backup
– Light Electric Vehicles (eBike, eScooter, Pedal
Assist Bicycles)
3 Description
The bq7718xy family of products provides an
overvoltage monitor and protector for Li-Ion battery
pack systems. Each cell is monitored independently
for an overvoltage condition. For quicker production-
line testing, the bq7718xy device provides a
Customer Test Mode (CTM) with greatly reduced
delay time.
In the bq7718xy device, an internal delay timer is
initiated upon detection of an overvoltage condition
on any cell. Upon expiration of the delay timer, the
output is triggered into its active state (either high or
low depending on the configuration).
Device Information Table⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq771800
WSON (8)
3.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet and the Device Comparison Table.
Block Diagram
PACK+
R_VD
VDD
C _VD
R_IN
V5
C_IN
R_IN
V4
C_IN
R_IN
V3
C_IN
R_IN
V2
C_IN
R_IN
V1
C_IN
VSS
V_OV
OSC
REG
INT_EN
Delay
Timer
OUT
PACK–
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION
DATA.