LTC2944CDD#PBF
Battery Gas GaugeThe LTC2944CDD#PBF is a battery gas gauge from Analog Devices Inc.. View the full LTC2944CDD#PBF datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
Key Specifications
| Parameter | Value |
|---|---|
| Battery Chemistry | Multi-Chemistry |
| Function | Battery Monitor |
| Interface | I2C, SMBus |
| Mounting Type | Surface Mount |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Package / Case | 8-WFDFN Exposed Pad |
| Supplier Device Package | 8-DFN (3x3) |
Overview
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 |
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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
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