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BQ27541DRZT-V200

IC BATT FUEL GAUGE LI-ION 12SON

Part Number: BQ27541DRZT-V200

Manufacturer: Texas Instruments

Category: Battery Management

Package: 12-VFDFN Exposed Pad

Datasheet:: BQ27541DRZT-V200.pdf

Description: IC BATT FUEL GAUGE LI-ION 12SON

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PRODUCT INFORMATION

Product Details

PRODUCT TECHNICAL REFERENCE

BQ27541DRZT-V200 Single-Cell Li-Ion Battery Fuel Gauge with Impedance Track™ Technology

A comprehensive technical overview of the BQ27541DRZT-V200, a single-cell Li-Ion battery fuel gauge from Texas Instruments featuring Impedance Track™ technology for accurate capacity prediction. Covers device function, core features, electrical specifications, 12-lead SON package, pin configuration, typical applications, and replacement selection guidance.

Texas Instruments 12-Lead SON (DRZ) 2.7V to 5.5V

Device Classification Single-Cell Li-Ion Battery Fuel Gauge

Part Number: BQ27541DRZT-V200

Mounting Type: Surface Mount

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

PRODUCT OVERVIEW

What Is the BQ27541DRZT-V200?

BQ27541DRZT-V200 is a single-cell Li-Ion battery fuel gauge from Texas Instruments utilizing proprietary Impedance Track™ technology for high-accuracy capacity prediction. Designed as a microcontroller peripheral for battery pack integration, this device provides fuel gauging for single-cell Li-Ion battery packs and can be interrogated by a system processor to provide cell information such as state-of-charge (SOC), time-to-empty (TTE), and time-to-full (TTF).[reference:0]

The BQ27541DRZT-V200 measures cell voltage, temperature, and current to determine battery state-of-charge. It monitors charge and discharge activity and uses Texas Instruments' proprietary Impedance Track™ algorithm to achieve state-of-charge predictions with less than 1% error across a wide variety of operating conditions and over the lifetime of the battery.[reference:1]

Information is accessed through a series of commands via the I²C interface. The device provides 96 bytes of user-programmable data flash memory, partitioned into three 32-byte blocks: Manufacturer Info Block A, Manufacturer Info Block B, and Manufacturer Info Block C.[reference:2] The BQ27541DRZT-V200 is available in a compact 12-lead SON (DRZ) package and is rated for operation from –40°C to +85°C.[reference:3] The V200 suffix denotes firmware version 2.00, which provides enhancements over the previous G1 version (1.12).[reference:4]

Impedance Track™ Technology Proprietary algorithm achieves less than 1% SOC error across a wide variety of operating conditions and over the lifetime of the battery.[reference:5]

High Integration & Low Power 96 bytes of user-programmable flash memory and internal temperature sensor in a compact 12-lead SON package.[reference:6]

V200 Firmware Enhanced firmware version 2.00 with Impedance Track™ improvements over version 1.12.[reference:7]

DEVICE HIGHLIGHTS

Key Features and Benefits of BQ27541DRZT-V200

Impedance Track™ Fuel Gauging

Proprietary Texas Instruments algorithm provides accurate state-of-charge prediction with less than 1% error across a wide variety of operating conditions and over the lifetime of the battery.[reference:8]

Integrated Temperature Sensing

Internal temperature sensor for system temperature reporting and battery temperature monitoring via the TS input (103AT-type thermistor), supporting the fuel gauging algorithm and charger-control sections.[reference:9]

96 Bytes of User-Programmable Memory

96 bytes of user-programmable data flash memory, partitioned into three 32-byte blocks for manufacturer information and configuration data.[reference:10]

I²C Interface

I²C-compatible interface supports communication with system processors for accessing cell information such as SOC, TTE, and TTF through Standard and Extended Commands.[reference:11]

V200 Firmware Enhancements

Firmware version 2.00 provides Impedance Track™ enhancements and improved performance over the previous G1 version (1.12).[reference:12]

Compact 12-Pin SON Package

Available in a space-saving 2.5mm × 4mm, 12-lead SON (DRZ) package with 0.4mm pitch, ideal for space-constrained battery pack designs.[reference:13]

REFERENCE DATA

Technical Specifications for BQ27541DRZT-V200

Part Number	BQ27541DRZT-V200	Manufacturer	Texas Instruments
Device Type	Single-Cell Li-Ion Battery Fuel Gauge	Series	Impedance Track™
Function	Multi-Function Controller	Battery Chemistry	Lithium-Ion / Lithium-Polymer
Supply Voltage (VDD)	2.45V to 5.5V[reference:14]	Operating Temperature	-40°C to +85°C[reference:15]
Interface	I²C / HDQ[reference:16]	I²C Clock Frequency	400 kHz[reference:17]
Number of Cells	1	Sense Resistor Range	5mΩ to 20mΩ[reference:18]
REG25 Output Voltage	2.5V[reference:19]	REGIN Input Voltage	2.45V to 5.5V[reference:20]
Package	12-Lead SON (DRZ)	Package Body Size	2.5mm × 4.0mm[reference:21]
Package / Case	12-VFDFN Exposed Pad	Supplier Device Package	12-SON (2.5x4)
Pin Pitch	0.4mm	Mounting Type	Surface Mount
Moisture Sensitivity Level	Level-2-260C-1 YEAR[reference:22]	RoHS	Green (RoHS & no Sb/Br)[reference:23]
Lead Finish	CU NIPDAU[reference:24]	Packaging	Tape & Reel (250 per Reel)[reference:25]
Device Marking	BQ / 7541	Lifecycle Status	Active (NRND)[reference:26]

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.

DESIGN REFERENCE

Circuit Considerations for BQ27541DRZT-V200

Configuration & Operation

The BQ27541DRZT-V200 is a microcontroller peripheral that provides fuel gauging for single-cell Li-Ion battery packs:

Fuel Gauging: Measures cell voltage (BAT), temperature (TS), and current (SRP/SRN) to determine battery SOC[reference:27]
Impedance Track™ Algorithm: Achieves less than 1% SOC error across a wide variety of operating conditions[reference:28]
I²C Interface: Standard commands provide cell information such as SOC, TTE, and TTF[reference:29]
96-Byte Flash Memory: User-programmable data flash for manufacturer information[reference:30]
Internal Temperature Sensor: Provides system temperature reporting via TS input[reference:31]
Low-Value Sense Resistor: Supports 5mΩ to 20mΩ for flexible current sensing[reference:32]
V200 Firmware: Version 2.00 with Impedance Track™ enhancements[reference:33]

PCB and Power-Supply Guidance

Battery fuel gauge performance depends on layout, bypassing, and power supply quality:

Power Supply: VDD supply voltage from 2.45V to 5.5V; internal integrated LDO provides 2.5V output[reference:34]
Bypass Capacitors: Decouple BAT with 0.1 µF capacitor and REGIN with 0.1 µF ceramic capacitor[reference:35][reference:36]
REG25 Capacitor: Connect a minimum 0.47 µF ceramic capacitor from REG25 to VSS[reference:37]
Sense Resistor Connection: Kelvin connect SRP and SRN pins to the sense resistor (5mΩ to 20mΩ) for accurate current measurement[reference:38]
TS Input: Connect a 103AT-type thermistor to the TS pin for battery temperature monitoring[reference:39]
I²C Interface: Use 10kΩ pull-up resistors on SDA and SCL lines for proper communication[reference:40]
SE Pin: System Shutdown Enable output allows the fuel gauge to power-off through an external circuit[reference:41]
VCC Input: Processor power input; the 0.47µF capacitor on REG25 should be placed close to VCC[reference:42]
Verify the recommended PCB footprint from the official datasheet before production

12-LEAD SON (DRZ)

Pin Configuration Reference for BQ27541DRZT-V200

BQ 7541

SON (DRZ) TOP VIEW

Confirm package orientation and pin numbering against the official package drawing before PCB layout. The DRZ package has 12 pins with 0.4mm pitch and a 2.5mm × 4.0mm body size. Device marking is "BQ" on top row and "7541" on second row.

1 SE Shutdown Enable Output - Push-pull output; allows fuel gauge to power-off through external circuit[reference:43][reference:44]

2 REG25 Internal LDO Output - 2.5V regulated output; connect min 0.47µF ceramic capacitor to VSS[reference:45]

3 REGIN Internal LDO Input - Connect 0.1µF ceramic capacitor[reference:46]

4 BAT Battery Voltage Sense Input - Cell voltage measurement; decouple with 0.1µF capacitor[reference:47]

5 VCC Processor Power Input - System power supply for the device[reference:48]

6 VSS Ground - Device ground reference[reference:49]

7 SRP Sense Resistor Positive - Connect to coulomb counter positive input; nearest CELL- connection[reference:50]

8 SRN Sense Resistor Negative - Connect to coulomb counter negative input; nearest PACK- connection[reference:51]

9 TS Temperature Sense Input - Connect 103AT-type thermistor for battery temperature monitoring[reference:52]

10 SDA I²C Data Line - Open-drain bidirectional data line; use 10kΩ pull-up resistor[reference:53]

11 SCL I²C Clock Line - Serial clock input; use 10kΩ pull-up resistor[reference:54]

12 HDQ HDQ Serial Communications Line - Alternative communication interface; open-drain[reference:55]

APPLICATION AREAS

Typical Applications for BQ27541DRZT-V200

Single-Cell Li-Ion Battery Packs

Fuel gauging for single-cell Li-Ion and Li-Polymer battery packs in portable devices.

Portable Consumer Electronics

Smartphones, tablets, and portable media players requiring accurate battery capacity monitoring.

Notebook Computers

Battery management for notebook and ultrabook battery packs.

Digital Cameras

Fuel gauging for camera battery packs with accurate SOC and runtime prediction.

Portable Medical Devices

Battery monitoring for portable medical equipment and handheld diagnostic devices.

Industrial Portable Equipment

Battery fuel gauging for handheld industrial test and measurement equipment.

REPLACEMENT GUIDANCE

Selecting an Alternative for BQ27541DRZT-V200

A replacement for the BQ27541DRZT-V200 should not be selected only by product category. The electrical characteristics, package, and pin configuration must be evaluated against the actual circuit requirements.

Battery chemistry (Li-Ion/Li-Polymer, single-cell)

Supply voltage range (2.45V–5.5V)

Interface (I²C, 400 kHz)

Impedance Track™ technology

Package (12-lead SON, 2.5mm × 4mm)

Temperature range (–40°C to 85°C)

Internal temperature sensor

V200 firmware version

Family alternatives: BQ27541DRZR-V200 (3,000 per reel packaging, same V200 firmware), BQ27541DRZT-G1 (G1 firmware version 1.12, same electrical specs), BQ27541DRZR-G1 (G1 firmware, 3,000 per reel). The V200 suffix denotes firmware version 2.00 with Impedance Track™ enhancements over G1 (version 1.12).[reference:56] For new designs, Texas Instruments recommends newer generation fuel gauge devices such as the BQ27542 or BQ27545-G1. The BQ27541DRZT-V200 has an NRND (Not Recommended for New Designs) lifecycle status.[reference:57] Select based on firmware version, packaging, and qualification requirements.

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MANUFACTURER INFORMATION

Texas Instruments

The BQ27541 (BQ27541DRZT-V200) belongs to the Impedance Track™ battery fuel gauge portfolio of Texas Instruments. The device is designed for single-cell Li-Ion battery fuel gauging with high-accuracy capacity prediction. The V200 firmware version (2.00) provides Impedance Track™ enhancements over the previous G1 version (1.12).[reference:58]

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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: BQ27541DRZT-V200

Manufacturer: Texas Instruments

Package: 12-VFDFN Exposed Pad

Series: Impedance Track™

Package/Case: 12-VFDFN Exposed Pad

Packaging: Tape & Reel (TR)

Product Status: Obsolete

Function: Multi-Function Controller

Battery Chemistry: Lithium Ion

Number of Cells: 1

Fault Protection: Over Temperature

Interface: I2C

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

Grade: -

Qualification: -

Mounting Type: Surface Mount

Supplier Device Package: 12-SON (2.5x4)

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Part Number: BQ27541DRZT-V200

Manufacturer: Texas Instruments

Package: 12-VFDFN Exposed Pad

Category: Battery Management

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