Datasheet

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DESCRIPTION (Continued)
PACKAGE DISSIPATION RATINGS
ABSOLUTE MAXIMUM RATINGS
bq29312A
SLUS629A – JANUARY 2005 – REVISED AUGUST 2005
These devices have limited built-in ESD protection. The leads should be shorted together or the device
placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
The communications interface allows the host to observe and control the current status of the bq29312A. It
enables cell balancing, enters different power modes, sets overload levels, sets the overload blanking delay time,
sets short-circuit threshold levels for charge and discharge, and sets the short-circuit blanking delay time.
Cell balancing of each cell is performed via a cell bypass path, which is enabled via the internal control register
accessible via the I
2
C compatible interface. The maximum bypass current is set via an external series resistor
and internal FET on resistance (typical 400 Ω ).
ORDERING INFORMATION
(1)
PACKAGED
T
A
TSSOP (PW)
(2)
QFN (RTH)
(3)
–40°C to 85°C bq29312APWR-SA bq29312ARTH
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
(2) The bq29312A can be ordered in tape and reel by adding the suffix R to the orderable part number, ie: bq29312APWR bq29312ARTHR.
(3) The QFN package is also made available in mini reel, add suffix T to the orderable part number, ie: bq29312ARTHT.
POWER RATING
POWER RATING DERATING FACTOR
PACKAGE
T
A
≤ 25°C ABOVE T
A
≤ 25°C
T
A
≤ 70°C T
A
= 85°C
PW 874 mW 6.99 W/°C 559 mW 454 mW
over operating free-air temperature range unless otherwise noted
(1) (2)
bq29312A
V
CC
Supply voltage range PACK, BAT –0.3 V to 34 V
VC1, VC2, VC3, VC4 –0.3 V to 34 V
SR1, SR2 –1.0 V to 1.0 V
VC5 –1.0 V to 4.0 V
V
I
Input voltage range
VC1 to VC2, VC2 to VC3, VC3 to VC4, VC4 to
–0.3 to 8.5 V
VC5
WDI, SLEEP, SCLK, SDATA –0.3 to 8.5 V
ZVCHG –0.3 V to 34 V
DSG, CHG –0.3 V to BAT
OD –0.3 V to 34 V
V
O
Output voltage range
PMS –0.3 V to PACK–0.2 V
TOUT, SCLK, SDATA, CELL, XALERT –0.3 to 7 V
Current for cell balancing 10 mA
Continuous total power dissipation See Dissipation Rating Table
T
stg
Storage temperature range –65°C to 150°C
Lead temperature (soldering, 10 s) 300°C
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltages are with respect to ground of this device except VCn–VC(n+1), where n = 1-, 2-, 3-, 4-cell voltage.
2