Texas Instruments BQ76942, Manual

Page: 10 / 85

7.3 Recommended Operating Conditions (continued)
Typical values stated where T
A
= 25°C and V
BAT
= 55.0 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 55 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
LD(ACC)
LD pin voltage measurement
accuracy
(5)
0 V < V
LD
- V
VSS
≤ 55 V, T
A
= -40°C
to 85°C
(1)
–0.5 0.5 V
(1) Cell voltage accuracy is specified after completion of board offset calibration
(2) While in SLEEP mode, it is important that the cell 1 voltage measurement be validated before being considered valid. For further
information and details, see
Cell 1 Voltage Validation during SLEEP Mode .
(3) Specified by design
(4) Voltage on VC0 can extend higher (limited by absolute maximum specification) during cell balancing.
(5) Specified by characterization
(6) Values may need to be optimized during system design and evaluation for best performance
7.4 Thermal Information BQ76942
THERMAL METRIC
(1)
BQ76942
UNIT PFB (TQFP)
48 PINS
R
θJA
Junction-to-ambient thermal resistance 66.0 °C/W
R
θJC(top)
Junction-to-case (top) thermal resistance 19.6 °C/W
R
θJB
Junction-to-board thermal resistance 29.3 °C/W
Ψ
JT
Junction-to-top characterization parameter 0.8 °C/W
Ψ
JB
Junction-to-board characterization parameter 29.1 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
7.5 Supply Current
Typical values stated where T
A
= 25°C and V
BAT
= 55.0 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 55 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
NORMAL
Normal Mode
Regular measurements and protections active,
REG1 = 3.3 V with no load, REG2 = OFF, CHG
= ON in 11 V overdrive mode, DSG = ON in 11 V
overdrive mode,
Settings:Configuration:Power
Config[FASTADC] = 0, no communication
286 µA
I
SLEEP_1
SLEEP Mode
Periodic protections and monitoring, no pack
current, REG1 = OFF, REG2 = OFF, CHG =
OFF, DSG = ON in 11 V overdrive mode, no
communication,
Power:Sleep:Voltage Time = 5
s
41 µA
I
SLEEP_2
SLEEP Mode
Periodic protections and monitoring, no pack
current, REG1 = OFF, REG2 = OFF, CHG
= OFF, DSG = source follower mode, no
communication,
Power:Sleep:Voltage Time = 5
s
24 µA
I
DEEPSLEEP_1
DEEPSLEEP Mode
No monitoring or protections, REG1 = 3.3 V
with no load, REG2 = OFF, LFO = ON, no
communication
10.7 µA
I
DEEPSLEEP_2
DEEPSLEEP Mode
No monitoring or protections, REG1 = 3.3 V
with no load, REG2 = OFF, LFO = OFF, no
communication
9.2 µA
I
SHUTDOWN
SHUTDOWN Mode
All blocks powered down, with the exception
of the TS2 wakeup circuit, no monitoring or
protections, no communication
1 3.1 µA
BQ76942
SLUSE14B – DECEMBER 2020 – REVISED DECEMBER 2021
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