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Linear Technology Electronic Components Datasheet

LTC2942-1 Datasheet

1A 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 ADC Measures Battery Voltage and Temperature
n Integrated Temperature Sensor
n 1% Voltage and 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 Players
n Cameras
n GPS
LTC2942-1
1A Battery Gas Gauge with
Internal Sense Resistor and
Temperature/Voltage
Measurement
Description
The LTC®2942-1 measures battery charge state, battery
voltage and chip temperature in 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. Battery voltage and on-chip temperature
are measured with an internal 14-bit No Latency ∆Σ
ADC. The three measured quantities (charge, voltage and
temperature) are stored in internal registers accessible via
the onboard SMBus/I2C interface.
The LTC2942-1 features programmable high and low
thresholds for all three measured quantities. If a pro-
grammed threshold is exceeded, 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
No Latency ∆Σ, 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+
LTC2942-1
AL/CC
SDA
SENSE
SCL
GND
LOAD
0.1µF
+ 1-CELL
Li-Ion
29421 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
29421 TA01b
29421f



Linear Technology Electronic Components Datasheet

LTC2942-1 Datasheet

1A Battery Gas Gauge

No Preview Available !

LTC2942-1
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
LTC2942-1C.............................................. 0°C to 70°C
LTC2942-1I........................................... –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
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 9)
EXPOSED PAD (PIN 7): DO NOT CONNECT
Order Information
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
LTC2942CDCB-1#TRMPBF LTC2942CDCB-1#TRPBF LDYR
6-Lead (2mm × 3mm) Plastic DFN
LTC2942IDCB-1#TRMPBF LTC2942IDCB-1#TRPBF LDYR
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)
Battery Gas Gauge On, ADC Sleep
2.7
l
5.5
70 100
120
Battery Gas Gauge On, ADC Converting Voltage
l
300 400
Battery Gas Gauge On, ADC Converting Temperature l
350 450
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 8)
l
50
±1
50
74 100
qLSB Charge LSB (Note 4)
Prescaler M = 128 (Default)
TCE
Total Charge Error (Note 5)
0.2A ≤ |ISENSE–| ≤ 1A DC
0.2A ≤ |ISENSE–| ≤ 1A DC, 0°C to 70°C
0.02A ≤ |ISENSE–| ≤ 1A DC (Note 8)
l
0.085
±1
±1.8
±2.8

UNITS
V
µA
µA
µA
µA
µA
µA
V
A
mAh
%
%
%
29421f


Part Number LTC2942-1
Description 1A Battery Gas Gauge
Maker Linear Technology
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