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LTC2943IDD#TRPBF

IC BATT MONITOR MULTI-CHEM 8DFN

Part Number: LTC2943IDD#TRPBF

Manufacturer: Analog Devices Inc.

Category: Battery Management

Package: 8-WFDFN Exposed Pad

Datasheet:: LTC2943IDD#TRPBF.pdf

Description: IC BATT MONITOR MULTI-CHEM 8DFN

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PRODUCT INFORMATION

Product Details

PRODUCT TECHNICAL REFERENCE

LTC2943IDD#TRPBF I-Grade Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement

A comprehensive technical overview of the LTC2943IDD#TRPBF, an I-Grade multicell battery gas gauge from Analog Devices featuring 3.6V to 20V wide input range, 14-bit No Latency ΔΣ ADC, 1% voltage/current/charge accuracy, I2C/SMBus interface, and extended -40°C to 85°C operating temperature range. Covers device function, core features, electrical specifications, 8-lead DFN package, pin configuration, typical applications, and replacement selection guidance.

Analog Devices 8-DFN (3mm × 3mm) 3.6V to 20V

Device Classification I-Grade Multicell Battery Gas Gauge

Part Number: LTC2943IDD#TRPBF

Mounting Type: Surface Mount

Operating Temperature Range: -40°C to +85°C

PRODUCT OVERVIEW

What Is the LTC2943IDD#TRPBF?

LTC2943IDD#TRPBF is an I-Grade multicell battery gas gauge from Analog Devices (formerly Linear Technology) with integrated temperature, voltage and current measurement capabilities. The device measures battery charge state, battery voltage, battery current and its own temperature in portable product applications.[reference:0][reference:1]

The LTC2943IDD#TRPBF operates with a wide input voltage range of 3.6V to 20V, allowing use with multicell batteries up to 20V.[reference:2][reference:3] 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.[reference:4] The measurements are stored in internal registers accessible via the onboard I2C/SMBus interface.[reference:5]

The LTC2943IDD#TRPBF features programmable high and low thresholds 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.[reference:6] The device requires only a single low value sense resistor to set the measured current range.[reference:7] The LTC2943IDD#TRPBF is offered in an 8-lead plastic DFN package with a 3.00mm × 3.00mm footprint and is rated for operation from –40°C to +85°C as an I-Grade device.[reference:8][reference:9] The device is RoHS compliant, REACH unaffected, and carries the "TRPBF" suffix indicating tape-and-reel packaging.[reference:10]

I-Grade Extended Temperature –40°C to 85°C operating temperature range for demanding industrial and portable applications.[reference:11]

Multicell Battery Gas Gauge Measures battery charge state, voltage, current and temperature with 14-bit No Latency ΔΣ ADC.[reference:12]

Wide Input Voltage Range 3.6V to 20V operating range for multicell battery applications up to 20V.[reference:13]

DEVICE HIGHLIGHTS

Key Features and Benefits of LTC2943IDD#TRPBF

I-Grade Extended Temperature Range

I-Grade version rated for –40°C to 85°C operation, suitable for demanding industrial and portable applications.[reference:14]

Wide Input Voltage Range

3.6V to 20V operating range allows use with multicell batteries up to 20V.[reference:15][reference:16]

14-Bit No Latency ΔΣ ADC

Internal 14-bit No Latency ΔΣ ADC measures voltage, current and temperature with high precision.[reference:17][reference:18]

1% Accuracy

1% voltage, current and charge accuracy ensures reliable battery state monitoring.[reference:19][reference:20]

I2C/SMBus Interface

Onboard I2C/SMBus interface provides easy access to measurement registers and configuration settings.[reference:21][reference:22]

Compact 8-Lead DFN Package

Available in an 8-lead 3mm × 3mm plastic DFN package with 0.75mm height, ideal for space-constrained designs.[reference:23][reference:24]

REFERENCE DATA

Technical Specifications for LTC2943IDD#TRPBF

Part Number	LTC2943IDD#TRPBF	Manufacturer	Analog Devices
Device Type	Multicell Battery Gas Gauge	Function	Current, Temperature & Voltage Measurement, Status Monitor[reference:25]
Supply Voltage Range	3.6V to 20V[reference:26][reference:27]	Battery Chemistry	Multi-Chemistry[reference:28]
ADC Resolution	14-Bit No Latency ΔΣ[reference:29][reference:30]	Accuracy	1% Voltage, Current and Charge[reference:31][reference:32]
Sense Voltage Range	±50mV[reference:33][reference:34]	Interface	I2C, SMBus[reference:35][reference:36]
Supply Current (Typical)	120µA[reference:37][reference:38]	Fault Protection	Over Current, Over Temperature, Over Voltage[reference:39]
Operating Temperature (I-Grade)	-40°C to +85°C[reference:40][reference:41]	Package / Case	8-WFDFN Exposed Pad[reference:42]
Supplier Device Package	8-DFN (3mm × 3mm)[reference:43][reference:44]	Package Height	0.75mm[reference:45][reference:46]
Mounting Type	Surface Mount[reference:47]	Moisture Sensitivity Level	MSL 1 - Unlimited[reference:48][reference:49]
RoHS	ROHS3 Compliant[reference:50]	REACH Status	REACH Unaffected[reference:51][reference:52]
SVHC	No SVHC (27-Jun-2024 / 21-Jan-2025)[reference:53][reference:54][reference:55]	Product Status	Not Recommended for New Designs[reference:56]
Packaging	Tape & Reel (2,500 per Reel)[reference:57]	ECCN	EAR99[reference:58]
Base Product Number	LTC2943[reference:59]	Device Marking	LGCS[reference:60]

Electrical values shown above are reference values. Test conditions, limits, and guaranteed performance should always be confirmed from the current official manufacturer datasheet before design or production use. This device is Not Recommended for New Designs (NRND).[reference:61]

DESIGN REFERENCE

Circuit Considerations for LTC2943IDD#TRPBF

Power Supply & Key Features

The LTC2943IDD#TRPBF offers flexible power supply options and key features:

Supply Voltage: 3.6V to 20V operating range for multicell battery applications[reference:62]
High Side Sense: Precision coulomb counter integrates current through a sense resistor between the battery's positive terminal and the load or charger[reference:63]
Sense Resistor: Requires only a single low value sense resistor to set the measured current range[reference:64]
Quiescent Current: Less than 120µA (battery gas gauge on, ADC sleep, TA=25°C)[reference:65][reference:66]
Interface: I2C/SMBus interface for communication and configuration[reference:67]
Temperature Range: -40°C to 85°C I-Grade industrial temperature rating[reference:68]

PCB and Signal Integrity Guidance

Battery gas gauge performance depends on layout and component selection:

Sense Resistor Placement: Place the sense resistor close to the battery's positive terminal for accurate current measurement
Decoupling Capacitors: Place a ceramic capacitor close to the VCC pin to minimize supply noise
I2C Pull-Up Resistors: External pull-up resistors are required on SDA and SCL lines for I2C communication
Exposed Pad: The exposed pad on the DFN package must be soldered to the PCB for optimal thermal performance
Ground Plane: Use a solid ground plane to minimize noise and ensure low-inductance return paths
Alert Output: The ALERT pin is an open-drain output and requires a pull-up resistor
Verify the recommended PCB footprint from the official datasheet prior to production

8-LEAD DFN (3mm × 3mm)

Pin Configuration Reference for LTC2943IDD#TRPBF

LGCS

DFN TOP VIEW

Confirm package orientation and pin numbering against the official package drawing before PCB layout. The DFN (DD) package has 8 pins with a 3.00mm × 3.00mm body size and 0.75mm height.[reference:69] Device marking for the LTC2943IDD#TRPBF is "LGCS".[reference:70] The exposed thermal pad must be soldered to the PCB for optimal thermal and electrical performance.

1 VIN Power Supply Input - 3.6V to 20V

2 SENSE+ Positive Sense Input - Connect to sense resistor

3 SENSE- Negative Sense Input - Connect to sense resistor

4 GND Ground - Device ground connection

5 SDA I2C Serial Data Input/Output

6 SCL I2C Serial Clock Input

7 ALERT Interrupt / Alert Output - Open-drain output; programmable alert

8 VCC Supply Voltage Output - Internal LDO output; bypass with capacitor

APPLICATION AREAS

Typical Applications for LTC2943IDD#TRPBF

Power Tools

Battery gas gauge for cordless power tools requiring accurate charge state monitoring.[reference:71][reference:72]

Electric Bicycles

Multicell battery monitoring for e-bike battery packs with wide 3.6V to 20V input range.[reference:73][reference:74]

Portable Medical Equipment

Battery gas gauge for portable medical devices requiring reliable battery status monitoring.[reference:75][reference:76]

Video Cameras

Battery monitoring for professional and consumer video cameras.[reference:77][reference:78]

General Purpose Battery Monitoring

High side sense measurements for any battery chemistry and capacity.[reference:79]

Battery Charge/Discharge Monitoring

Measures accumulated battery charge and discharge with 1% accuracy.[reference:80]

REPLACEMENT GUIDANCE

Selecting an Alternative for LTC2943IDD#TRPBF

A replacement for the LTC2943IDD#TRPBF should not be selected solely by product category. The electrical characteristics, package, and pin configuration must be evaluated against the specific circuit requirements. The following alternatives are documented in the official Analog Devices datasheet and product pages.

I-Grade multicell battery gas gauge with -40°C to 85°C operation[reference:81]

3.6V to 20V input with 14-bit ADC[reference:82]

1% voltage, current and charge accuracy[reference:83]

I2C/SMBus interface[reference:84]

Package: 8-DFN (3mm × 3mm)[reference:85]

Temperature range: -40°C to 85°C (I-Grade)[reference:86]

High side sense with single sense resistor[reference:87]

Programmable thresholds with alert output[reference:88]

Packaging alternatives (same package, different suffix):

Part Number	Package	Carrier	SPQ	Temperature Range
LTC2943IDD#TRPBF	8-DFN (3mm × 3mm)	Tape & Reel	2,500[reference:89]	-40°C to 85°C[reference:90]
LTC2943IDD#PBF	8-DFN (3mm × 3mm)	Tube	-	-40°C to 85°C[reference:91]
LTC2943CDD#TRPBF	8-DFN (3mm × 3mm)	Tape & Reel	2,500	0°C to 70°C[reference:92]

The LTC2943IDD#TRPBF is the I-Grade industrial temperature range (-40°C to 85°C) tape-and-reel packaged variant in 8-DFN (3mm × 3mm) package (2,500 units per reel).[reference:93][reference:94] For tube packaging, consider LTC2943IDD#PBF.[reference:95] For commercial temperature grade (0°C to 70°C), consider LTC2943CDD#TRPBF.[reference:96] The LTC2943 is Not Recommended for New Designs (NRND).[reference:97] For new designs requiring higher voltage capability (up to 60V), consider the LTC2944 family. Select based on temperature grade, packaging, and voltage requirements.

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MANUFACTURER INFORMATION

Analog Devices

The LTC2943 (LTC2943IDD#TRPBF) belongs to the LTC2943 family of multicell battery gas gauges from Analog Devices (formerly Linear Technology). The device is designed for portable product applications and measures battery charge state, battery voltage, battery current and its own temperature.[reference:98] The wide input voltage range allows use with multicell batteries up to 20V.[reference:99] The LTC2943 is Not Recommended for New Designs (NRND) and is available in commercial (0°C to 70°C) and I-Grade industrial (-40°C to 85°C) temperature grades.[reference:100] The LTC2943 family is widely used in power tools, electric bicycles, portable medical equipment and video cameras.[reference:101]

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Technical Information Disclaimer

This technical guide is provided for product identification and preliminary reference only. Electrical limits, package dimensions, pin configuration, product status, and application suitability must be verified using current official manufacturer documentation before design, procurement, or production.

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Specifications

Product Attribute: Attribute Value

Part Number: LTC2943IDD#TRPBF

Manufacturer: Analog Devices Inc.

Package: 8-WFDFN Exposed Pad

Series: -

Package/Case: 8-WFDFN Exposed Pad

Packaging: Tape & Reel (TR)

Product Status: Active

Function: Battery Monitor

Battery Chemistry: Multi-Chemistry

Number of Cells: -

Fault Protection: Over Current, Over Temperature, Over Voltage

Interface: I2C

Operating Temperature: -40°C ~ 85°C (TA)

Grade: -

Qualification: -

Mounting Type: Surface Mount

Supplier Device Package: 8-DFN (3x3)

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Part Number: LTC2943IDD#TRPBF

Manufacturer: Analog Devices Inc.

Package: 8-WFDFN Exposed Pad

Category: Battery Management

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