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LTC2941IDCB#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
LTC2941
1
2941fb
For more information www.linear.com/LTC2941
Typical applicaTion
DescripTion
Battery Gas Gauge
with I
2
C Interface
The LT C
®
2941 measures battery charge state in battery-
supplied handheld PC and portable product applications.
Its operating range is perfectly suited for single-cell Li-Ion
batteries. A precision coulomb counter integrates current
through a sense resistor between the battery’s positive
terminal and the load or charger. The measured charge
is stored in internal registers. An SMBus/I
2
C interface
accesses and configures the device.
The LTC2941 features programmable high and low thresh
-
olds for accumulated charge. If a threshold is exceeded, the
device communicates an alert using either the SMBus alert
protocol or by setting a flag in the internal status register.
The LTC2941 requires only a single low value external
sense resistor to set the current range.
FeaTures
applicaTions
n
Indicates Accumulated Battery Charge and
Discharge
n
High Accuracy Analog Integration
n
High Side Sense
n
1% Charge Accuracy
n
±50mV Sense Voltage Range
n
SMBus/I
2
C Interface
n
Configurable Alert Output/Charge Complete Input
n
2.7V to 5.5V Operating Range
n
Quiescent Current Less Than 100µA
n
Small 6-Pin 2mm × 3mm DFN and 8-Lead
MSOPPackages
n
Low Power Handheld Products
n
Cellular Phones
n
MP3 Player
n
Cameras
n
GPS
Total Charge Error vs
Differential Sense Voltage
+
SENSE
+
I
2
C/SMBus
TO HOST
SENSE
–
CHARGER
LTC2941
AL/CC
SDA
LOAD
0.1µF
2941 TA01a
1-CELL
Li-Ion
R
SENSE
100mΩ
SCL
GND
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
V
SENSE
(mV)
0.1
–1.0
CHARGE ERROR (%)
0
–0.5
–1.5
0.5
1.0
1 10 100
2941 TA01b
–2.0
V
SENSE
+ = 3.6V
2.0
1.5
LTC2941
2
2941fb
For more information www.linear.com/LTC2941
Supply Voltage (SENSE
+
) ............................. –0.3V to 6V
SCL, SDA, AL/CC ......................................... –0.3V to 6V
SENSE
–
.................................. –0.3V to (V
SENSE
+
+ 0.3V)
(Notes 1, 2)
TOP VIEW
SENSE
–
AL/CC
SDA
SENSE
+
GND
SCL
DCB PACKAGE
6-LEAD (2mm × 3mm) PLASTIC DFN
4
5
7
6
3
2
1
T
JMAX
= 150°C, θ
JA
= 120°C/W
EXPOSED PAD (PIN 7), DO NOT CONNECT
1
2
3
4
SENSE
+
GND
SCL
NC
8
7
6
5
SENSE
–
AL/CC
SDA
NC
TOP VIEW
MSE PACKAGE
8-LEAD PLASTIC MSOP
9
EXPOSED PAD (PIN 9), DO NOT CONNECT
orDer inFormaTion
pin conFiguraTion
absoluTe maximum raTings
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2941CDCB#TRMPBF LTC2941CDCB#TRPBF LFKQ 6-Lead (2mm × 3mm) Plastic DFN 0°C to 70°C
LTC2941IDCB#TRMPBF LTC2941IDCB#TRPBF LFKQ 6-Lead (2mm × 3mm) Plastic DFN –40°C to 85°C
TUBE TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2941CMS8E#PBF LTC2941CMS8E#TRPBF LTGVY 8-Lead Plastic MSOP 0°C to 70°C
LTC2941IMS8E#PBF LTC2941IMS8E#TRPBF LTGVY 8-Lead Plastic MSOP –40°C to 85°C
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
Operating Ambient Temperature Range
LTC2941C ................................................ 0°C to 70°C
LTC2941I.............................................. –40°C to 85°C
Storage Temperature Range ..................... –65°C to 150°
(http://www.linear.com/product/LTC2941#orderinfo)
LTC2941
3
2941fb
For more information www.linear.com/LTC2941
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Requirements
V
SENSE
+
Supply Voltage 2.7 5.5 V
I
SUPPLY
Supply Current (Note 3) Device On
l
70 100 µA
Shutdown
l
2.5 µA
Shutdown, V
SENSE
+
≤ 4.2V 1 µA
V
UVLO
Undervoltage Lockout Threshold V
SENSE
+
Falling, DCB Package
V
SENSE
+
Falling, MSE Package
l
l
2.5
2.45
2.6
2.6
2.7
2.7
V
V
Coulomb Counter
V
SENSE
Sense Voltage Differential Input Range V
SENSE
+
– V
SENSE
–
l
±50 mV
Differential Input Resistance, Across
SENSE
+
and SENSE
–
(Note 7)
400 kΩ
q
LSB
Charge LSB (Note 4) Prescaler M = 128 (Default),
R
SENSE
= 50mΩ
0.085 mAh
TCE Total Charge Error (Note 5) 10mV ≤ |V
SENSE
| ≤ 50mV DC ±1 %
10mV ≤ |V
SENSE
| ≤ 50mV, DC V
SENSE
+
≤ 4.2V
l
±1.5 %
1mV ≤ |V
SENSE
| ≤ 50mV DC (Note 7)
l
±3.5 %
V
BAT
Alert V
BAT
Alert Threshold V
SENSE
+
Falling, B[7:6] = 01
l
2.75 2.8 2.85 V
V
SENSE
+
Falling, B[7:6] = 10
l
2.85 2.9 2.95 V
V
SENSE
+
Falling, B[7:6] = 11
l
2.95 3 3.05 V
Digital Inputs and Digital Outputs
V
ITH
Logic Input Threshold, AL/CC, SCL,
SDA
l
0.3 •
V
SENSE
+
0.7 •
V
SENSE
+
V
V
OL
Low Level Output Voltage, AL/CC, SDA I = 3mA
l
0.4 V
I
IN
Input Leakage, AL/CC, SCL, SDA V
IN
= V
SENSE
+
/2
l
1 µA
C
IN
Input Capacitance, AL/CC, SCL, SDA (Note 7)
l
10 pF
t
PCC
Minimum Charge Complete (CC) Pulse
Width
1 µs
I
2
C Timing Characteristics
f
SCL(MAX)
Maximum SCL Clock Frequency
l
400 900 kHz
t
BUF(MIN)
Bus Free Time Between STOP/START
l
1.3 µs
t
SU,STA(MIN)
Minimum Repeated START Set-Up
Time
l
600 ns
t
HD,STA(MIN)
Minimum Hold Time (Repeated)
START Condition
l
600 ns
t
SU,STO(MIN)
Minimum Set-Up Time for STOP
Condition
l
600 ns
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LTC2941IDCB#TRMPBF

Mfr. #:
Buy LTC2941IDCB#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Bat Gas Gauge w/ I2C Int
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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