OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LTC2943IDD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC2943
1
2943fa
For more information www.linear.com/LTC2943
TYPICAL APPLICATION
FEATURES DESCRIPTION
Multicell Battery Gas Gauge
with Temperature, Voltage
and Current Measurement
The LTC
®
2943 measures battery charge state, battery volt-
age, battery current and its own temperature in portable
product
applications. The wide input voltage range allows
use with multicell batteries up to 20V. A precision coulomb
counter integrates current through a sense resistor between
the battery’s positive terminal and the load or charger.
Voltage, current and temperature are measured with an
internal 14-bit No Latency ΔΣ™ ADC. The measurements
are stored in internal registers accessible via the onboard
I
2
C/SMBus Interface.
The LTC2943 features programmable high and low thresh-
olds for
all four 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 LTC2943 requires only
a single low value sense resistor to set the measured
current range.
Total Charge Error vs
Differential Sense Voltage
APPLICATIONS
n
Measures Accumulated Battery Charge and Discharge
n
3.6V to 20V Operating Range for Multiple Cells
Application
n
14-Bit ADC Measures Voltage, Current and
Temperature
n
1% Voltage, Current and Charge Accuracy
n
±50mV Sense Voltage Range
n
High Side Sense
n
General Purpose Measurements for Any Battery
Chemistry and Capacity
n
I
2
C/SMBus Interface
n
Configurable Alert Output/Charge Complete Input
n
Quiescent Current Less Than 120µA
n
Small 8-Lead 3mm × 3mm DFN Package
n
Power Tools
n
Electric Bicycles
n
Portable Medical Equipment
n
Video Cameras
L, LT , LTC , LT M, Linear Technology and the Linear logo are registered trademarks and
No Latency
ΔΣ and PowerPath are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
V
SENSE
(mV)
0.1
–2.0
CHARGE ERROR (%)
0
–0.5
–1.0
–1.5
1.5
1.0
0.5
2.0
1 10 100
2943 TA01b
V
SENSE
+
= 10V
SENSE
+
ALCC
SDA
SCL
LTC2943
CHARGER
2k2k 2k
1A
LOAD
R
SENSE
50mΩ
MULTICELL
LI-ION
2943 TA01a
SENSE
–
+
GND
1µF
V
DD
3.3V
µP
LTC2943
2
2943fa
For more information www.linear.com/LTC2943
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
TOP VIEW
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
5
6
7
8
9
4
3
2
1SENSE
+
GND
GND
SCL
SENSE
–
GND
ALCC
SDA
T
JMAX
= 150°C, θ
JA
= 100°C/W
EXPOSED PAD (PIN 9) PCB GND CONNECTION OP
TIONAL
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Requirements
V
SENSE
+
Supply Voltage 3.6 20 V
I
SUPPLY
Supply Current (Note 3) Battery Gas Gauge On, ADC Sleep
Battery Gas Gauge On, ADC On
Shutdown
l
l
l
80
650
15
120
750
25
µA
µA
µA
I
SENSE
+
Pin Current (Note 3) Battery Gas Gauge On, ADC Sleep
Battery Gas Gauge On, ADC On
Shutdown
80
500
15
µA
µA
µA
I
SENSE
–
Pin Current (Note 3) Battery Gas Gauge On, ADC Sleep
Battery Gas Gauge On, ADC On
Shutdown
1
150
1
µA
µA
µA
V
UVLO
Undervoltage Lockout Threshold V
SENSE
+
Falling
l
3.0 3.3 3.6 V
Coulomb Counter
V
SENSE
Sense Voltage Differential Input
Range
V
SENSE
+
– V
SENSE
–
l
±50 mV
R
IDR
Differential Input Resistance Across
SENSE
+
and SENSE
–
(Note 8)
400 kΩ
q
LSB
Charge LSB (Note 4) Prescaler M = 4096(Default), R
SENSE
= 50mΩ 0.340 mAh
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
ORDER INFORMATION
Supply Voltage (SENSE
+
) ........................... –0.3V to 24V
SCL, SDA, ALCC Voltage .............................. –0.3V to 6V
SENSE
–
...............(–0.3V + V
SENSE
+
) to (V
SENSE
+
+ 0.3V)
Operating Ambient Temperature Range
LTC2943C ............................................... 0°C to 70°C
LTC2943I ............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2943CDD#PBF LTC2943CDD#TRPBF LGCS 8-Lead (3mm × 3mm) Plastic DFN 0°C to 70°C
LTC2943IDD#PBF LTC2943IDD#TRPBF LGCS 8-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
LTC2943
3
2943fa
For more information www.linear.com/LTC2943
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
TCE Total Charge Error (Note 5) 10mV ≤ |V
SENSE
| ≤ 50mV DC
10mV ≤ |V
SENSE
| ≤ 50mV DC
1mV ≤ |V
SENSE
| ≤ 10mV DC (Note 8)
l
l
±1
±1.5
±3.5
%
%
%
V
OSE
Effective Differential Offset Voltage
(Note 9)
V
SENSE
≥ 500µV, V
SENSE
+
= 10V
l
5 10 µV
Voltage Measurement ADC
Resolution (No Missing Codes) (Note 8)
l
14 Bits
V
FS(V)
Full-Scale Voltage Conversion 23.6 V
ΔV
LSB
Quantization Step of 14-Bit Voltage
ADC
(Note 6) 1.44 mV
TUE
V
Voltage Total Unadjusted Error
l
1
1.3
%
%
Gain
V
Voltage Gain Accuracy
l
1.3 %
INL
V
Integral Nonlinearity V
SENSE
+
> 5V
l
±1 ±4 LSB
3.6V ≤ V
SENSE
+
≤ 5V
l
±8 LSB
T
CONV(V)
Voltage Conversion Time
l
48 ms
Current Measurement ADC
Resolution (No Missing Codes) (Note 8)
l
12 Bits
V
FS(I)
Full-Scale Current Conversion
l
±60 mV
V
SENSE
Sense Voltage Differential Input
Range
V
SENSE
+
– V
SENSE
–
l
±50 mV
ΔI
LSB
Quantization Step of 12-Bit Current
ADC
(Note 6) 29.3 µV
Gain
I
Current Gain Accuracy
l
1
1.3
%
%
V
OS(I)
Offset ±1 ±10 LSB
INL
I
Integral Nonlinearity
l
±1 ±4 LSB
T
CONV(I)
Current Conversion Time
l
8 ms
Temperature Measurement ADC
Resolution (No Missing Codes) (Note 8)
l
11 Bits
T
FS
Full-Scale Temperature 510 K
ΔT
LSB
Quantization Step of 11-Bit
Temperature ADC
(Note 6) 0.25 K
TUE
T
Temperature Total Unadjusted Error V
SENSE
+
≥ 5V
(Note 8)
l
±3
±5
K
K
T
CONV(T)
Temperature Conversion Time
l
8 ms
Digital Inputs and Digital Outputs
V
ITH(HV)
Logic Input Threshold V
SENSE
+
≥ 5V
l
0.8 2.2 V
V
ITH(LV)
3.6V < V
SENSE
+
< 5V 0.5 1.8 V
V
OL
Low Level Output Voltage, ALCC,
SDA
I = 3mA, V
SENSE
+
≥ 5V
l
0.4 V
I
IN
Input Leakage, ALCC, SCL, SDA V
IN
= 5V
l
1 µA
C
IN
Input Capacitance, ALCC, SCL, SDA (Note 8)
l
10 pF
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC2943IDD#TRPBF

Mfr. #:
Buy LTC2943IDD#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management 20V Battery Gas Gauge with Voltage, Current & Temperature Measurement
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet