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Linear Technology Electronic Components Datasheet

LTC2941-1 Datasheet

1A I2C Battery Gas Gauge

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Features
n Indicates Accumulated Battery Charge and
Discharge
n SMBus/I2C Interface
n Integrated 50mΩ High Side Sense Resistor
n ±1A Sense Current Range
n High Accuracy Analog Integration
n 1% Charge Accuracy
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 package
Applications
n Low Power Handheld Products
n Cellular Phones
n MP3 Player
n Cameras
n GPS
LTC2941-1
1A I2C Battery Gas Gauge
with Internal Sense Resistor
Description
The LTC®2941-1 measures battery charge state in battery-
powered 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 an internal sense resistor between the battery’s
positive terminal and the load or charger. The measured
charge is stored in internal registers. An SMBus/I2C in-
terface accesses and configures the device.
The LTC2941-1 features programmable high and low
thresholds for accumulated charge. If a threshold is ex-
ceeded, the device communicates an alert using either the
SMBus alert protocol or by setting a flag in the internal
status register.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap, ThinSOT and Bat-Track are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Typical Application
CHARGER
I2C/SMBus
TO HOST
SENSE+
LTC2941-1
AL/CC
SDA
SENSE
SCL
GND
LOAD
0.1µF
+ 1-CELL
Li-Ion
29411 TA01a
Total Charge Error vs Sense Current
1.00
VSENSE+ = 3.6V
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
1
10 100
|ISENSE| (mA)
1000
29411 TA01b
29411f



Linear Technology Electronic Components Datasheet

LTC2941-1 Datasheet

1A I2C Battery Gas Gauge

No Preview Available !

LTC2941-1
Absolute Maximum Ratings
(Notes 1, 2)
Supply Voltage (SENSE+)............................. –0.3V to 6V
SCL, SDA, AL/CC.......................................... –0.3V to 6V
Sense Current (into SENSE).....................................±2A
Operating Ambient Temperature Range
LTC2941-1C.............................................. 0°C to 70°C
LTC2941-1I........................................... –40°C to 85°C
Storage Temperature Range..................... –65°C to 150°
Pin Configuration
SENSE+ 1
GND 2
SCL 3
TOP VIEW
7
6 SENSE
5 AL/CC
4 SDA
DCB PACKAGE
6-LEAD (2mm s 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 160°C/W (NOTE 8)
EXPOSED PAD (PIN 7): DO NOT CONNECT
Order Information
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
LTC2941CDCB-1#TRMPBF LTC2941CDCB-1#TRPBF LFKP
6-Lead (2mm × 3mm) Plastic DFN
LTC2941IDCB-1#TRMPBF LTC2941IDCB-1#TRPBF LFKP
6-Lead (2mm × 3mm) Plastic DFN
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.
Consult LTC Marketing for information on lead based finish parts.
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/
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
Power Requirements
VSENSE+
ISUPPLY
Supply Voltage
Supply Current (Note 3)
Device On
2.7 5.5
70 100
l 120
Shutdown
l
2.5
VUVLO
Undervoltage Lockout Threshold
Coulomb Counter
Shutdown, VSENSE+ ≤ 4.2V
VSENSE+ Falling
1
l 2.5 2.6 2.7
ISENSE–
RSENSE
RPP
Sense Current
Internal Sense Resistance
Pin-to-Pin Resistance from SENSE+ to
SENSE
(Note 7)
l
50
±1
50
74 100
qLSB Charge LSB (Note 4)
TCE Total Charge Error (Note 5)
Prescaler M = 128 (Default)
0.2A ≤ |ISENSE | ≤ 1A DC
0.085
±1
0.2A ≤ |ISENSE | ≤ 1A DC, 0°C to 70°C
±1.8
0.02A ≤ |ISENSE | ≤ 1A DC (Note 7)
l
±2.8
Vbat Alert Vbat Alert Threshold
VSENSE– Falling, B[7:6] = 01, ISENSE– = 0A l
2.75
2.8
2.85
VSENSE– Falling, B[7:6] = 10, ISENSE– = 0A l
2.85
2.9
2.95
VSENSE– Falling, B[7:6] = 11, ISENSE– = 0A l
2.95
3
3.05
UNITS
V
µA
µA
µA
µA
V
A
mAh
%
%
%
V
V
V
29411f



Part Number LTC2941-1
Description 1A I2C Battery Gas Gauge
Maker Linear
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