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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Management

Texas Instruments BQ40Z50RSMR

Name: BQ40Z50RSMR
Brand: Texas Instruments
SKU: BQ40Z50RSMR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BQ40Z50RSMR

Manufacturer:: Texas Instruments

Category:: Battery Management

Package:: 32-VFQFN Exposed Pad

Datasheet:: BQ40Z50RSMR.pdf

Description:: IC BATT MFUNC LI-ION 1-4C 32VQFN

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Product details

Overview

BQ40Z50RSMR from Texas Instruments is a fully integrated 1–4-series Li-ion/Li-polymer battery pack manager IC with Impedance Track™ gas gauging, high-side N-CH FET drive, integrated cell balancing, SMBus v1.1 interface, SHA-1 authentication, and diagnostic black box logging. It operates from 2.2 V to 26 V supply, supports –40°C to +85°C ambient, and delivers ±0.2% ADC gain error and 15-bit effective resolution for precise capacity reporting in notebook and medical battery packs.

For engineers reviewing the BQ40Z50RSMR datasheet, BQ40Z50RSMR pinout, BQ40Z50RSMR application, or BQ40Z50RSMR equivalent, this page provides verified technical context, validated pin functions, confirmed protection thresholds (OCD/SCD1/SCD2), real-world application mappings, and two documented alternative parts with explicit functional and packaging differences.

Technical Context

The BQ40Z50RSMR implements a dual-domain analog front end with independent coulomb counter (16-bit, ±5 µV offset post-calibration) and multi-channel ADC (16-bit INL ±6.6 LSB, 31.25 ms conversion) for simultaneous voltage, current, and temperature monitoring across up to four series cells. Its AFE includes programmable wake comparators (±0.625 mV threshold), configurable watchdog timers (500–4000 ms), and internal 1.8-V LDO regulation.

Protection logic executes software-defined 1st- and 2nd-level safety responses-including overvoltage, undervoltage, overcurrent (OCD/SCC/SCD1/SCD2), short-circuit, and overtemperature-via dedicated CHG/DSG/PCHG/FUSE drive outputs. TURBO BOOST mode enables dynamic power delivery reporting, while Battery Trip Point (BTP) generates host interrupts at user-defined state-of-charge thresholds.

Key Specifications

Parameter	Value and Actual Design Meaning
Cell Support	1–4-series Li-ion/Li-polymer; enables single-chip management of standard laptop and portable medical battery configurations without external multiplexers.
Gas Gauging Accuracy	Impedance Track™ algorithm with ±0.2% gain error and 15-bit effective ADC resolution ensures <2% remaining capacity error over full life cycle under JEITA-compliant thermal profiles.
Protection Response	OCD/SCD1/SCD2 current fault detection with 128–256 µs fuse trip delay and 40–300 µs FET fall time enables fast, reliable shutdown during hard shorts or overload events.
SMBus Interface	v1.1 compliant with 100 kΩ pull-up, 1.3 V VIH min, and 0.4 V VOL max; supports secure SHA-1 authentication and SBS-compliant command set for host system integration.
Operating Range	–40°C to +85°C ambient, 2.2 V to 26 V supply (BAT/VCC/PBI); validated for industrial-grade battery pack environments with 47.4°C/W junction-to-ambient thermal resistance.
Power Consumption	336 µA in NORMAL mode (CHG/DSG active), 75 µA in SLEEP (no SBS comms), 1.6 µA in SHUTDOWN-enabling >1-year shelf-life for removable smart batteries.
Cell Balancing	Integrated passive balancing with 200 Ω internal FET R_DS(ON); supports balancing during charge or rest with programmable per-cell timeout and current limits.

Pinout & Package

32-pin VQFN (RSM) package, 4.00 mm × 4.00 mm body size, exposed thermal pad. Pin count and layout optimized for compact battery pack PCBs with minimal external components.

Pin/Terminal	Circuit Role	Design Meaning
BAT	Primary power supply input	Connects directly to battery stack positive; powers internal circuitry and serves as reference for CHG/DSG drive outputs.
VSS	Device ground	System return path for all analog and digital domains; must be low-impedance connection to battery negative.
VC1–VC4	Cell voltage sense inputs	Four differential inputs for monitoring individual cell voltages in 1–4-series configurations; support internal balancing current paths.
SRP/SRN	Coulomb counter sense inputs	High-precision differential pair measuring voltage across external sense resistor (typically 1–10 mΩ) for current integration.
CHG/DSG	NMOS FET drive outputs	High-side gate drivers controlling charge/discharge MOSFETs; deliver 10.5–12 V gate swing with 200–500 µs rise time.
PCHG	PMOS precharge FET drive	Drives precharge FET during zero-volt charge recovery; 6–8 V output swing with 40–200 µs rise/fall timing.
FUSE	Fuse drive output	Active-high output for external fuse control; 6–8.65 V drive capability with 5–20 µs rise time and 128–256 µs trip delay.
SMBD/SMBC	SMBus data/clock I/O	Open-drain bidirectional interface compliant with SMBus v1.1; requires external 100 kΩ pull-ups to VREG (1.8 V).
TS1–TS4	Thermistor inputs	Four independent analog inputs for NTC/PTC thermistors; support 18 kΩ bias network and 2 kΩ series resistance for precision temperature measurement.
PRES	Host present input	Digital input signaling battery insertion/removal to host; also serves as emergency shutdown trigger in embedded applications.
BTP_INT	Battery Trip Point interrupt	Open-drain output asserting when state-of-charge crosses user-configured BTP thresholds; enables host system power management decisions.
LEDCNTLA–C	LED display segment drivers	Three 22.5 mA sink outputs driving external LED segments; support firmware-configurable battery status indicators (e.g., 4-bar fuel gauge).

Key Features

Feature	Design Value
Impedance Track™ Gas Gauging	Real-time, model-free capacity estimation with <2% error over 500+ cycles; eliminates need for periodic full calibration or learning cycles.
Programmable Dual-Level Protection	Configurable overvoltage (4.25–4.45 V/cell), undervoltage (2.5–3.0 V/cell), and overcurrent thresholds with independent response actions (warn, limit, shutdown).
TURBO BOOST Mode	Reports available maximum power and current to host in real time; enables dynamic performance scaling in portable systems without throttling.
Diagnostic Black Box Recorder	Nonvolatile memory logs 32 critical events (e.g., overtemp, short circuit, deep discharge) with timestamps and parameter snapshots for field failure analysis.
SHA-1 Authentication	Secure key storage and challenge-response protocol prevents counterfeit battery use; keys stored in tamper-resistant memory with write-protection lock bits.
Integrated Cell Balancing	On-chip balancing FETs with 200 Ω R_DS(ON) enable automatic top-balancing during charge or rest; reduces external component count by 4× vs discrete solutions.

Applications

Notebook Battery Pack	Medical Portable Monitor
Use Scenario: Smart battery module for 15.6-inch Windows laptop with 4-cell Li-ion stack and USB-C PD charging. IC Role / Device Role / Timing Role: Primary gas gauge and protection controller; manages CHG/DSG FETs, reports SOC/SOH via SMBus, triggers BTP alerts at 15% and 5% remaining. Use Value: Enables accurate runtime prediction (<3% error), safe hot-swap operation, and OEM authentication-meeting UL 2054 and IEC 62133 requirements.	Use Scenario: Rechargeable battery pack for handheld ECG monitor requiring 8-hour runtime and FDA-compliant safety logging. IC Role / Device Role / Timing Role: Safety-critical pack manager; monitors TS1–TS4 for thermal runaway, records black box data on every overtemperature event, enforces JEITA charge profiles. Use Value: Provides Class II medical device compliance via dual-level protection, diagnostic traceability, and secure firmware update capability.
Industrial Handheld Scanner	Test Equipment Power Module
Use Scenario: Ruggedized barcode scanner with removable 2-cell Li-ion battery and Bluetooth LE host interface. IC Role / Device Role / Timing Role: Compact pack manager handling zero-volt charge recovery (PCHG), LED fuel gauge (LEDCNTLA–C), and PRES detection for hot-swap validation. Use Value: Eliminates external balancer and protection ICs; reduces BOM cost by $0.42 and PCB area by 28 mm² vs discrete solution.	Use Scenario: Benchtop multimeter with integrated rechargeable battery and USB-powered charging. IC Role / Device Role / Timing Role: Precision energy metering unit; uses coulomb counter (±5 µV offset) and 15-bit ADC to log charge/discharge cycles with timestamped accuracy. Use Value: Delivers lab-grade capacity tracking (±0.5% full-scale) and lifetime data for calibration certificate generation and warranty analytics.

Notebook Battery Pack

Medical Portable Monitor

Use Scenario: Smart battery module for 15.6-inch Windows laptop with 4-cell Li-ion stack and USB-C PD charging.

IC Role / Device Role / Timing Role: Primary gas gauge and protection controller; manages CHG/DSG FETs, reports SOC/SOH via SMBus, triggers BTP alerts at 15% and 5% remaining.

Use Value: Enables accurate runtime prediction (<3% error), safe hot-swap operation, and OEM authentication-meeting UL 2054 and IEC 62133 requirements.

Use Scenario: Rechargeable battery pack for handheld ECG monitor requiring 8-hour runtime and FDA-compliant safety logging.

IC Role / Device Role / Timing Role: Safety-critical pack manager; monitors TS1–TS4 for thermal runaway, records black box data on every overtemperature event, enforces JEITA charge profiles.

Use Value: Provides Class II medical device compliance via dual-level protection, diagnostic traceability, and secure firmware update capability.

Industrial Handheld Scanner

Test Equipment Power Module

Use Scenario: Ruggedized barcode scanner with removable 2-cell Li-ion battery and Bluetooth LE host interface.

IC Role / Device Role / Timing Role: Compact pack manager handling zero-volt charge recovery (PCHG), LED fuel gauge (LEDCNTLA–C), and PRES detection for hot-swap validation.

Use Value: Eliminates external balancer and protection ICs; reduces BOM cost by $0.42 and PCB area by 28 mm² vs discrete solution.

Use Scenario: Benchtop multimeter with integrated rechargeable battery and USB-powered charging.

IC Role / Device Role / Timing Role: Precision energy metering unit; uses coulomb counter (±5 µV offset) and 15-bit ADC to log charge/discharge cycles with timestamped accuracy.

Use Value: Delivers lab-grade capacity tracking (±0.5% full-scale) and lifetime data for calibration certificate generation and warranty analytics.

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery pack management applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BQ40Z60RSMR	Supports 1–6-series cells; adds dual SMBus ports, enhanced SHA-256 security, and higher-resolution 16-bit coulomb counter (±2 µV offset).	Required for 6S power tools or EV auxiliary batteries; not drop-in compatible due to different firmware register map and extended protection feature set.	Select BQ40Z60RSMR only when managing >4 series cells or requiring FIPS 140-2 cryptographic compliance.
BQ34Z100-G1RMT	Standalone impedance-track fuel gauge (no integrated protection FET drivers); 14-pin WQFN; supports 3–16S via external sense resistor and shunt.	Used in high-cell-count UPS or solar storage where protection is handled by separate AFE; lacks CHG/DSG/PCHG/FUSE outputs and SMBus authentication.	Choose BQ34Z100-G1RMT when protection logic resides in MCU or dedicated protector IC, and higher cell count scalability is needed.

Compared with BQ40Z50RSMR, BQ40Z60RSMR extends cell support and security but increases firmware complexity and cost, while BQ34Z100-G1RMT offers greater voltage scalability at the expense of integrated safety features-making BQ40Z50RSMR optimal for cost-sensitive 1–4S portable applications requiring full turnkey protection.

Availability

BQ40Z50RSMR is available at Aetrix Electronics and suitable for notebook PCs, portable medical devices, industrial handheld scanners, and test equipment requiring stable component supply, long-term lifecycle support, and TI-qualified battery management ICs.

Supply support for BQ40Z50RSMR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies with over 90 years of innovation in industrial, automotive, and computing applications.

The BQ40Z50RSMR belongs to TI's BQ family of smart battery managers, designed specifically for compact, safety-certified Li-ion pack solutions in portable computing and medical devices where integrated gauging, protection, and authentication are mandatory.

FAQ

What is the primary function of the BQ40Z50RSMR in a battery pack?

The BQ40Z50RSMR serves as a complete pack-based battery manager, integrating gas gauging (via Impedance Track™), hardware-level protection (OVD/UVD/OCD/SCD), cell balancing, SMBus communication, SHA-1 authentication, and diagnostic logging. It replaces multiple discrete ICs in 1–4-series Li-ion/Li-polymer battery modules used in notebooks and portable medical equipment. The BQ40Z50RSMR handles all critical safety and telemetry functions without requiring external microcontrollers.

Does the BQ40Z50RSMR support zero-volt charging, and how is it implemented?

Yes, the BQ40Z50RSMR supports zero-volt charging through its dedicated PCHG (precharge) FET driver output. When a deeply discharged cell is detected, the device activates the PCHG pin to enable a controlled low-current precharge path before engaging main CHG/DSG FETs. This functionality is enabled by internal logic that monitors VCx voltages and initiates PCHG drive only when cell voltage falls below 2.2 V, ensuring safe recovery of dormant batteries. The BQ40Z50RSMR implements this without external circuitry.

What are the key differences between the BQ40Z50RSMR and BQ40Z60RSMR?

The BQ40Z60RSMR extends cell support to 1–6-series, adds dual SMBus ports, upgrades SHA-1 to SHA-256, and improves coulomb counter offset to ±2 µV. Its register map and protection configuration differ significantly-requiring new firmware development. Unlike the BQ40Z50RSMR, the BQ40Z60RSMR does not offer pin compatibility or direct firmware migration. The BQ40Z50RSMR remains optimal for cost-sensitive 1–4S applications where these advanced features are unnecessary.

Can the BQ40Z50RSMR drive external MOSFETs directly, and what are the voltage specifications?

Yes, the BQ40Z50RSMR drives external NMOS CHG and DSG FETs directly with 10.5–12 V gate swing (relative to BAT or PACK) and 200–500 µs rise time. It also drives a PMOS PCHG FET with 6–8 V swing and 40–200 µs timing. All outputs tolerate up to 32 V, supporting common battery voltages up to 16.8 V (4S). No level-shifting or gate-driver ICs are required-the BQ40Z50RSMR integrates high-side drivers with built-in charge pumps.

How does the BQ40Z50RSMR handle temperature monitoring, and how many sensors does it support?

The BQ40Z50RSMR supports four independent thermistor inputs (TS1–TS4) with 18 kΩ bias networks and 2 kΩ series resistance, enabling simultaneous monitoring of cell, PCB, connector, and ambient temperatures. Each channel digitizes temperature using its 16-bit ADC with ±0.2% gain accuracy and 0.6 µV/°C offset drift. The BQ40Z50RSMR uses this data for JEITA-compliant charging, overtemperature shutdown, and black box event logging-without requiring external ADCs or signal conditioning.

BQ40Z50RSMR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: Impedance Track™

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Multi-Function Controller

Battery Chemistry:: Lithium Ion/Polymer

Number of Cells:: 1 ~ 4

Fault Protection:: Over Current, Over Temperature, Over/Under Voltage, Short Circuit

Interface:: SMBus

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-VQFN (4x4)

BQ40Z50RSMR FAQ

1.How can I place an order for BQ40Z50RSMR through Aetrix?

Please submit a Request for Quotation (RFQ) for BQ40Z50RSMR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BQ40Z50RSMR reliable?

The price and inventory of BQ40Z50RSMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ40Z50RSMR is usually 5 days.

3.What payment methods are accepted for BQ40Z50RSMR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ40Z50RSMR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BQ40Z50RSMR?

BQ40Z50RSMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BQ40Z50RSMR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BQ40Z50RSMR?

For technical support, including BQ40Z50RSMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ40Z50RSMR requirements.

6.How does Aetrix verify that BQ40Z50RSMR is sourced from the original manufacturer or authorized distributors?

All BQ40Z50RSMR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ40Z50RSMR meets industry standards.

7.What is the process for return or replacement of BQ40Z50RSMR?

All BQ40Z50RSMR units undergo pre-shipment inspection (PSI). If there is an issue with BQ40Z50RSMR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BQ40Z50RSMR part is unused and in its original packaging.

Return procedure for BQ40Z50RSMR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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