Texas Instruments BQ76PL536TPAPRQ1

Overview

BQ76PL536TPAPRQ1 from Texas Instruments is an automotive-qualified, stackable 3–6 series cell lithium-ion battery monitor and secondary protection IC for EV/HEV battery packs. It integrates a ±1 mV typical accuracy 14-bit ADC, independent overvoltage/undervoltage/overtemperature comparators with programmable thresholds and delay times, six cell-balancing control outputs, and a precision 5-V LDO - all operating from 6 V to 30 V supply across –40°C to 105°C.

For engineers reviewing the BQ76PL536TPAPRQ1 datasheet, BQ76PL536TPAPRQ1 pinout, BQ76PL536TPAPRQ1 application, or BQ76PL536TPAPRQ1 equivalent, key selection considerations include its vertical SPI stacking capability (up to 192 cells), hot-pluggable operation without isolation components, dedicated fault/alert signaling, and ECC-OTP register storage for safety-critical configuration persistence.

Technical Context

The BQ76PL536TPAPRQ1 implements a dual-path analog monitoring architecture: a high-accuracy SAR ADC (6 µs/channel, ±1 mV) for precise cell voltage, brick voltage, temperature, and GPAI measurements; and independent hardware comparators for secondary protection that operate autonomously of the ADC and host controller. Protection thresholds and delays are stored in factory-programmed ECC-OTP memory.

Its vertical communication interface uses current-mode signaling (e.g., SCLK_N, CS_N, DRDY_N) with level-shifted north/south interfaces enabling daisy-chained stacks without optocouplers or isolators. The device supports synchronous conversion triggering across the stack via CONV_H/CONV_S signals and provides 3-state SPI host interface (SCLK_H/SDI_H/SDO_H/CS_H) alongside open-drain status outputs (FAULT_H, ALERT_H, DRDY_H).

Key Specifications

Pinout & Package

Package: TQFP-64 PowerPAD™ (PAP), thermally enhanced with exposed copper pad soldered to PCB VSS plane for thermal dissipation and electrical stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery monitor and secondary protection applications.

Compared with BQ76PL536TPAPTQ1, the BQ76PL536TPAPRQ1 offers identical functionality in a 250-unit reel format ideal for NPI and qualification; versus BQ76PL455AQKTRQ1, it adds sixth-cell support, 30 V operation, and enhanced stacking headroom - critical for scalable EV platforms.

Availability

BQ76PL536TPAPRQ1 is available at Aetrix Electronics and suitable for electric vehicle traction battery packs, hybrid electric vehicle HV modules, and uninterruptible power systems requiring stable component supply, automotive-grade lifecycle assurance, and long-term traceability.

Supply support for BQ76PL536TPAPRQ1 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 decades of automotive qualification expertise.

The BQ76PL536TPAPRQ1 belongs to TI's automotive-grade battery monitor and protector product line, engineered specifically for functional safety-compliant, high-voltage lithium-based energy storage systems in EV, HEV, and industrial UPS applications.

FAQ

What is the maximum number of BQ76PL536TPAPRQ1 devices that can be stacked vertically?

The BQ76PL536TPAPRQ1 supports vertical daisy-chaining of up to 32 devices, enabling monitoring of up to 192 cells (32 × 6) without external isolation components. This scalability relies on its current-mode north/south interface (e.g., SCLK_N, CONV_N, DRDY_N), which maintains signal integrity across high-voltage gradients. Each BQ76PL536TPAPRQ1 handles up to six cells, and stacking is achieved by connecting the north interface of one device to the south interface of the next.

Does the BQ76PL536TPAPRQ1 require a host microcontroller to perform protection functions?

No - the BQ76PL536TPAPRQ1 executes overvoltage, undervoltage, and overtemperature protection autonomously using dedicated hardware comparators and ECC-OTP-stored thresholds. These secondary protection functions activate independently of any host MCU and assert FAULT_H or ALERT_H within 100 µs of threshold violation. A host controller is only required for advanced features like register configuration, cell balancing control, or data logging via SPI.

What is the accuracy specification for cell voltage measurement on the BQ76PL536TPAPRQ1?

The BQ76PL536TPAPRQ1 achieves ±1 mV typical accuracy for cell voltage measurements (VCn–VCn−1) over –10°C to 50°C, with ±5 mV max error across the full –40°C to 105°C operating range. This performance is enabled by its 14-bit SAR ADC, factory-trimmed bandgap reference, and differential input architecture - critical for precise state-of-charge calculation and cell balancing decisions in the BQ76PL536TPAPRQ1.

How does the BQ76PL536TPAPRQ1 handle thermal protection?

The BQ76PL536TPAPRQ1 provides two independent differential temperature inputs (TS1+, TS1–, TS2+, TS2–) supporting thermistor or RTD sensors. Its built-in comparators monitor temperature-derived voltages against programmable thresholds stored in ECC-OTP memory, with detection accuracy of ±0.05 V (equivalent to ~2°C for common NTCs). Upon overtemperature detection, it asserts FAULT_H and can trigger cell balancing shutdown - all without host intervention.

Can the BQ76PL536TPAPRQ1 be used in non-automotive applications such as energy storage systems?

Yes - while qualified to AEC-Q100 Grade 1 (–40°C to 105°C), the BQ76PL536TPAPRQ1 is widely deployed in industrial energy storage systems (ESS), UPS, and e-mobility due to its robust 30 V supply range, hot-pluggable operation, and stackable architecture. Its functional safety features (ECC-OTP, autonomous protection) and wide temperature rating make it suitable for demanding non-automotive environments where reliability and longevity are critical - as confirmed in BQ76PL536TPAPRQ1 field deployments.