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LTC2942IDCB-1#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC2942-1
1
29421f
Typical applicaTion
DescripTion
1A Battery Gas Gauge with
Internal Sense Resistor and
Temperature/Voltage
Measurement
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/I
2
C 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.
FeaTures
applicaTions
n
Indicates Accumulated Battery Charge and
Discharge
n
SMBus/I
2
C 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
n
Low Power Handheld Products
n
Cellular Phones
n
MP3 Players
n
Cameras
n
GPS
Total Charge Error vs Sense Current
+
SENSE
+
I
2
C/SMBus
TO HOST
SENSE
–
CHARGER
LTC2942-1
AL/CC
SDA
LOAD
0.1µF
29421 TA01a
1-CELL
Li-Ion
SCL
GND
|I
SENSE
| (mA)
1
–0.50
CHARGE ERROR (%)
0
–0.25
–0.75
0.25
0.50
10 100 1000
29421 TA01b
–1.00
V
SENSE
+ = 3.6V
1.00
0.75
LTC2942-1
2
29421f
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
(Notes 1, 2)
TOP VIEW
SENSE
–
AL/CC
SDA
SENSE
+
GND
SCL
DCB PACKAGE
6-LEAD (2mm s 3mm) PLASTIC DFN
4
5
7
6
3
2
1
T
JMAX
= 150°C, θ
JA
= 160°C/W (Note 9)
EXPOSED PAD (PIN 7): DO NOT CONNECT
orDer inFormaTion
pin conFiguraTionabsoluTe maximum raTings
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) Battery Gas Gauge On, ADC Sleep
l
70 100
120
µA
µA
Battery Gas Gauge On, ADC Converting Voltage
l
300 400 µA
Battery Gas Gauge On, ADC Converting Temperature
l
350 450 µA
Shutdown
l
2.5 µA
Shutdown, V
SENSE
+
≤ 4.2V 1 µA
V
UVLO
Undervoltage Lockout Threshold V
SENSE
+
Falling
l
2.5 2.6 2.7 V
Coulomb Counter
I
SENSE
–
Sense Current
l
±1 A
R
SENSE
Internal Sense Resistance 50 mΩ
R
PP
Pin-to-Pin Resistance from
SENSE
+
to SENSE
–
(Note 8) 50 74 100 mΩ
q
LSB
Charge LSB (Note 4) Prescaler M = 128 (Default) 0.085 mAh
TCE Total Charge Error (Note 5) 0.2A ≤ |I
SENSE
–
| ≤ 1A DC ±1 %
0.2A ≤ |I
SENSE
–
| ≤ 1A DC, 0°C to 70°C ±1.8 %
0.02A ≤ |I
SENSE
–
| ≤ 1A DC (Note 8)
l
±2.8 %
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2942CDCB-1#TRMPBF LTC2942CDCB-1#TRPBF LDYR
6-Lead (2mm × 3mm) Plastic DFN
0°C to 70°C
LTC2942IDCB-1#TRMPBF LTC2942IDCB-1#TRPBF LDYR
6-Lead (2mm × 3mm) Plastic DFN
–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.
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/
LTC2942-1
3
29421f
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
Voltage Measurement ADC
Resolution (No Missing Codes) (Note 8)
l
14 Bits
V
FS
Full-Scale Voltage
l
6 V
∆V
LSB
Quantization Step of 14-Bit
Voltage ADC
(Note 6) 366.2 µV
TUE
V
Voltage Total Unadjusted Error
l
1
1.3
%
%
Gain Gain Accuracy
l
1.3 %
V
OS
Offset Extrapolated from Measurements at 5.5V and 2.7V ±1 ±10 LSB
INL Integral Nonlinearity
l
±1 ±4 LSB
t
CONV
Conversion Time
l
15 ms
Temperature Measurement ADC
Resolution (No Missing Code) (Note 8) 10 Bits
T
FS
Full-Scale Temperature (Note 10)
l
600 K
∆T
LSB
Quantization Step of 10-Bit
Temperature ADC
(Note 6) 0.586 K
TUE
T
Temperature Total Unadjusted
Error
V
SENSE
+
≥ 2.8V (Note 8)
l
±5
±3
K
K
t
CONV
Conversion Time
l
15 ms
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 8)
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
t
SU,DAT(MIN)
Minimum Data Setup Time Input
l
100 ns
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC2942IDCB-1#TRPBF

Mfr. #:
Buy LTC2942IDCB-1#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Battery Gas Gauge with Temperature & Voltage Measurement and Internal Sense Resistor
Lifecycle:
New from this manufacturer.
Delivery:
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