LTC2944C
The LTC2944C is an electronic component from Analog Devices Inc.. View the full LTC2944C datasheet below including electrical characteristics, absolute maximum ratings.
Manufacturer
Analog Devices Inc.
Category
Integrated CircuitsOverview
Part: LTC2944 — Linear Technology (now Analog Devices)
Type: Battery Gas Gauge
Description: The LTC2944 measures battery charge state, voltage, current, and its own temperature in portable product applications, supporting multicell batteries up to 60V with a 14-bit ADC and I2C/SMBus interface.
Operating Conditions:
- Supply voltage: 3.6–60 V
- Operating temperature: 0°C to 70°C (LTC2944C), -40°C to 85°C (LTC2944I)
- Sense voltage differential input range: ±50 mV
- Maximum SCL clock frequency: 400 kHz
Absolute Maximum Ratings:
- Max supply voltage (SENSE+): 65V
- Max SCL, SDA, ALCC voltage: 6V
- Max storage temperature: 150°C
Key Specs:
- Supply Current (Battery Gas Gauge On, ADC Sleep): 80 μA (typ), 150 μA (max)
- Undervoltage Lockout Threshold: 3.0 V (min), 3.5 V (typ), 3.6 V (max)
- Total Charge Error (10mV ≤ |VSENSE| ≤ 50mV DC): 1%
- Voltage Measurement ADC Resolution: 14 Bits
- Voltage Total Unadjusted Error: 1% (max)
- Current Measurement ADC Resolution: 12 Bits
- Current Gain Accuracy: 1% (max)
- Temperature Measurement ADC Resolution: 11 Bits
- Temperature Total Unadjusted Error (VSENSE+ ≥ 5V): ±3 K (max)
Features:
- Measures Accumulated Battery Charge and Discharge
- 3.6V to 60V Operating Range for Multiple Cells
- 14-Bit ADC Measures Voltage, Current and Temperature
- 1% Voltage, Current and Charge Accuracy
- ±50mV Sense Voltage Range
- High Side Sense
- I2C Interface/SMBus Interface
- Configurable Alert Output/Charge Complete Input
- Quiescent Current Less Than 150μA
- Small 8-Lead 3mm × 3mm DFN Package
Applications:
- Electric and Hybrid Electric Vehicles
- Power Tools
- Electric Bicycles, Motorcycles, Scooters
- High Power Portable Equipment
- Photo Voltaics
- Backup Battery Systems
Package:
- 8-Lead (3mm × 3mm) Plastic DFN
Features
- 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
Applications
- 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
Pin Configuration
http://www.linear.com/product/LTC2944#orderinfo
| 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 |
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Electrical Characteristics
temperature range, otherwise specifications are at T A = 25°C. (Note 2)
| SYMBOL | PARAMETER | CONDITIONS | MIN | TYP | MAX | UNITS | |
|---|---|---|---|---|---|---|---|
| Power Requirements | Power Requirements | Power Requirements | Power Requirements | Power Requirements | Power Requirements | Power Requirements | 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 | Coulomb Counter | Coulomb Counter | Coulomb Counter | Coulomb Counter | Coulomb Counter | Coulomb Counter | 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 |
K
| 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 \ |
| V OSE | Effective Differential Offset Voltage (Note 9) | V SENSE ≥ 500μV, V SENSE + = 30V | l | 5 | 10 | μV | |
| Voltage Measurement ADC | Voltage Measurement ADC | Voltage Measurement ADC | Voltage Measurement ADC | Voltage Measurement ADC | Voltage Measurement ADC | Voltage Measurement ADC | Voltage Measurement ADC |
| Resolution (No Missing Codes) | (Note 8) | l | 14 | Bits | |||
| V FS(V) | Full-Scale Voltage Conversion | 70.8 | V | ||||
| ∆V 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 | Current Measurement ADC | Current Measurement ADC | Current Measurement ADC | Current Measurement ADC | Current Measurement ADC | Current Measurement ADC | 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 | ||
| ∆I 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 | Temperature Measurement ADC | Temperature Measurement ADC | Temperature Measurement ADC | Temperature Measurement ADC | Temperature Measurement ADC | Temperature Measurement ADC | Temperature Measurement ADC |
| Resolution (No Missing Codes) | (Note 8) | l | 11 | Bits | |||
| T FS | Full-Scale Temperature | 510 | K | ||||
| ∆T 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 | Digital Inputs and Digital Outputs | Digital Inputs and Digital Outputs | Digital Inputs and Digital Outputs | Digital Inputs and Digital Outputs | Digital Inputs and Digital Outputs | Digital Inputs and Digital Outputs | 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 |
2944fa
Absolute Maximum Ratings
(Notes 1, 2)
- 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
Typical Application
60V Battery Gas Gauge with Temperature, Voltage and Current Measurement
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| LTC2944 | Analog Devices | CDD |
| LTC2944CDD#PBF | Analog Devices Inc. | 8-WFDFN Exposed Pad |
| LTC2944I | Analog Devices Inc. | — |
Data on this page is extracted from publicly available manufacturer datasheets using automated tools including AI. It may contain errors or omissions. Always verify specifications against the official manufacturer datasheet before making design or purchasing decisions. See our Terms of Service. Rights holders can submit a takedown request.
Get structured datasheet data via API
Get started free