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Linear Technology Electronic Components Datasheet

LTC2942 Datasheet

Battery Gas Gauge

No Preview Available !

Features
n Indicates Accumulated Battery Charge and
Discharge
n High Accuracy Analog Integration
n ADC Measures Battery Voltage and Temperature
n Integrated Temperature Sensor
n High Side Sense
n 1% Voltage and Charge Accuracy
n ±50mV Sense Voltage Range
n SMBus/I2C 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 package
Applications
n Low Power Handheld Products
n Cellular Phones
n MP3 Players
n Cameras
n GPS
LTC2942
Battery Gas Gauge
with Temperature,
Voltage Measurement
Description
The LTC®2942 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 a 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 ∆∑™ ADC. The three measured
quantities (charge, voltage and temperature) are stored in
internal registers accessible via the onboard SMBus/I2C
interface.
The LTC2942 features programmable high and low thresh-
olds for all three measured quantities. If a programmed
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 LTC2942 requires only a single low value sense resis-
tor to set the measured current range.
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
AL/CC
SDA SENSE
SCL
GND
RSENSE
100mΩ
+ 1-CELL
Li-Ion
2942 TA01a
LOAD
0.1µF
Total Charge Error vs
Differential Sense Voltage
2.0
VSENSE+ = 3.6V
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0.1
1 10
VSENSE (mV)
100
2942 TA01b
2942fa
1


Linear Technology Electronic Components Datasheet

LTC2942 Datasheet

Battery Gas Gauge

No Preview Available !

LTC2942
Absolute Maximum Ratings
(Notes 1, 2)
Supply Voltage (SENSE+).............................. –0.3V to 6V
SCL, SDA, AL/CC.......................................... –0.3V to 6V
SENSE................................... –0.3V to (VSENSE+ + 0.3V)
Operating Ambient Temperature Range
LTC2942C................................................. 0°C to 70°C
LTC2942I.............................................. –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 × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 120°C/W
EXPOSED PAD (PIN 7), DO NOT CONNECT
Order Information
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
LTC2942CDCB#TRMPBF LTC2942CDCB#TRPBF LDVN
6-Lead (2mm × 3mm) Plastic DFN
LTC2942IDCB#TRMPBF LTC2942IDCB#TRPBF LDVN
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
Power Requirements
CONDITIONS
MIN TYP MAX UNITS
VSENSE+
ISUPPLY
Supply Voltage
Supply Current (Note 3)
Battery Gas Gauge On, ADC Sleep
Battery Gas Gauge On, ADC Converting Voltage
Battery Gas Gauge On, ADC Converting Temperature
l
l
l
2.7
5.5
70 100
300 350
350 420
V
µA
µA
µA
VUVLO
Undervoltage Lockout Threshold
Coulomb Counter
Shutdown
Shutdown, VSENSE+ ≤ 4.2V
VSENSE+ Falling
l 2.5
1
l 2.5 2.6 2.7
µA
µA
V
VSENSE
RIDR
Sense Voltage Differential Input
Range
Differential Input Resistance,
Across SENSE+ and SENSE
(Note 8)
VSENSE+ – VSENSE–
l ±50 mV
400 kΩ
2942fa
2


Part Number LTC2942
Description Battery Gas Gauge
Maker Linear Technology
PDF Download

LTC2942 Datasheet PDF






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