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LTC2944CDD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC2944
1
2944f
For more information www.linear.com/LTC2944
Typical applicaTion
FeaTures DescripTion
60V Battery Gas Gauge
with Temperature, Voltage
and Current Measurement
The LTC
®
2944 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 60V. 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 LTC2944 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 LTC2944 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 60V Operating Range for Multiple Cells
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
I
2
C Interface/SMBus Interface
n
General Purpose Measurements for Any Battery
Chemistry and Capacity
n
Configurable Alert Output/Charge Complete Input
n
Quiescent Current Less Than 150µA
n
Small 8-Lead 3mm × 3mm DFN Package
n
Electric and Hybrid Electric Vehicles
n
Power Tools
n
Electric Bicycles, Motorcycles, Scooters
n
High Power Portable Equipment
n
Photo Voltaics
n
Backup Battery Systems
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.
SENSE
+
ALCC
SDA
SCL
LTC2944
CHARGER
2k2k 2k
1A
LOAD
R
SENSE
50mΩ
MULTICELL
Li-ION
2944 TA01a
SENSE
–
+
GND
1µF
V
DD
3.3V
µP
V
SENSE
(mV)
0.1
–1
CHARGE ERROR (%)
0
–2
2
1
1 10 100
2944 TA01b
–3
3
V
SENSE
+
= 3.6V TO 60V
LTC2944
2
2944f
For more information www.linear.com/LTC2944
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 OPTIONAL
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Requirements
V
SENSE
+
Supply Voltage
l
3.6 60 V
I
SUPPLY
Supply Current (Note 3) Battery Gas Gauge On, ADC Sleep
Battery Gas Gauge On, ADC On
Shutdown
l
l
l
80
850
15
150
950
30
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
350
1
µA
µA
µA
V
UVLO
Undervoltage Lockout Threshold V
SENSE
+
Falling
l
3.0 3.5 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
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2944CDD#PBF LTC2944CDD#TRPBF LGCR 8-Lead (3mm × 3mm) Plastic DFN 0°C to 70°C
LTC2944IDD#PBF LTC2944IDD#TRPBF LGCR 8-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
*Temperature grades are identified by a label on the shipping container.
Consult LT C Marketing for parts specified with wider operating temperature ranges.
Consult LT C 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/
Supply Voltage (SENSE
+
) ........................... –0.3V to 65V
SCL, SDA, ALCC Voltage .............................. –0.3V to 6V
SENSE
–
...............(–0.3V + V
SENSE
+
) to (V
SENSE
+
+ 0.3V)
Operating Ambient Temperature Range
LTC2944C ............................................... 0°C to 70°C
LTC2944I ............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
http://www.linear.com/product/LTC2944#orderinfo
LTC2944
3
2944f
For more information www.linear.com/LTC2944
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
+ = 30V
l
5 10 µV
Voltage Measurement ADC
Resolution (No Missing Codes) (Note 8)
l
14 Bits
V
FS(V)
Full-Scale Voltage Conversion 70.8 V
ΔV
LSB
Quantization Step of 14-Bit Voltage
ADC
(Note 6) 4.32 mV
TUE
V
Voltage Total Unadjusted Error
l
1
1.3
%
%
Gain
V
Voltage Gain Accuracy
l
1.3 %
INL
V
Integral Nonlinearity
l
±1 ±4 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 ±64 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) 31.25 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
t
PCC
Minimum Charge Complete (CC)
Pulse Width
1 µs
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC2944CDD#PBF

Mfr. #:
Buy LTC2944CDD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management 60V Battery Gas Gauge with Voltage, Current & Temperature Measurement
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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