Texas Instruments BQ756506PAPRQ1

Overview

BQ756506PAPRQ1 from Texas Instruments is a standalone, AEC-Q100 Grade 1 automotive battery monitor IC for 4S or 6S Li-ion modules, delivering ±1.5-mV cell voltage accuracy, integrated shunt-based current sensing, and autonomous 240-mA internal cell balancing with thermal pause/resume control. It operates across –40°C to +125°C ambient and supports UART host interface and built-in SPI controller for system integration in 12-V automotive battery packs.

For engineers reviewing the BQ756506PAPRQ1 datasheet, BQ756506PAPRQ1 pinout, BQ756506PAPRQ1 application, or BQ756506PAPRQ1 equivalent, key selection criteria include its ASIL D functional safety capability, 128-µs full-cell-voltage acquisition time, integrated 5-V LDO for digital isolators, redundancy-enabled diagnostics (voltage/temperature/current), and HTQFP-64 package compatibility with TI's BQ756xx-Q1 family.

Technical Context

The BQ756506PAPRQ1 implements a dual-ADC architecture: a high-precision 16-bit main ADC for cell voltage (±1.5 mV accuracy) and a 14-bit auxiliary ADC for temperature, BAT, GPIO, and diagnostic measurements. Its integrated post-ADC digital low-pass filters enable DC-like voltage readings, while synchronized current-sense and cell-voltage sampling improves SOC estimation fidelity.

It features hardware-redundant diagnostics paths for open-wire detection on VC/CB pins, fuse/relay status monitoring via GPIOs, and autonomous balancing control with real-time die temperature feedback (DieTemp1 ±3°C, DieTemp2 ±6°C). The device supports both ACTIVE and SLEEP modes with supply currents of 11.6 mA and 160 µA respectively, and includes a dedicated 5-V LDO output (CVDD) capable of sourcing 10 mA externally.

Key Specifications

Pinout & Package

Package: HTQFP-64 (PAP), 10.00 mm × 10.00 mm, thermally enhanced with exposed thermal pad. Pinout optimized for differential RC filtering on cell inputs and balanced PCB layout for noise immunity in high-voltage battery monitoring.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ75614PAPRQ1 and BQ79616QPAPRQ1, the BQ756506PAPRQ1 uniquely combines 4S/6S flexibility, integrated 240-mA balancing, and ASIL D-ready diagnostics in a single-package solution-eliminating external FETs and isolation components required by alternatives.

Availability

BQ756506PAPRQ1 is available at Aetrix Electronics and suitable for automotive start-stop systems, e-bike battery packs, and commercial vehicle auxiliary power modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.

Supply support for BQ756506PAPRQ1 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 for automotive, industrial, and communications markets.

The BQ756xx-Q1 product line delivers standalone, ASIL D-capable battery monitors for 12-V to 48-V automotive systems, designed to simplify BMS development while meeting stringent functional safety and thermal robustness requirements.

FAQ

What is the maximum number of cells supported by the BQ756506PAPRQ1?

The BQ756506PAPRQ1 supports up to six series-connected lithium-ion cells (6S) in standalone configuration, with configurable operation for either 4S or 6S topologies. This flexibility allows it to serve both 12-V and 24-V automotive battery systems without hardware change. The device does not support daisy-chaining or expansion beyond six cells - for higher cell counts, TI recommends the stackable BQ796xx-Q1 family. BQ756506PAPRQ1 achieves full 6S voltage acquisition in under 128 µs using its integrated main ADC.

Does the BQ756506PAPRQ1 include internal cell balancing capability?

Yes, the BQ756506PAPRQ1 integrates six internal balancing FETs supporting up to 240 mA per channel, with automatic thermal management that pauses and resumes balancing based on die temperature feedback. Balancing is controlled entirely in hardware or via host command, eliminating the need for external FETs, drivers, or thermal sensors. The BQ756506PAPRQ1 uses CB0–CB6 pins to connect balancing resistors directly to cell terminals, and its Rdson specification (1.45–4.6 Ω) ensures predictable current regulation. This integrated approach reduces BOM cost and PCB area versus discrete balancing solutions.

What interfaces does the BQ756506PAPRQ1 provide for host communication?

The BQ756506PAPRQ1 provides a dedicated UART interface (TX/RX pins) for asynchronous serial communication with a host microcontroller, along with an integrated SPI controller accessible via GPIO1–GPIO8. UART is the primary interface for register access, fault reporting, and configuration; SPI is intended for auxiliary peripherals such as external EEPROM or sensor hubs. The device does not support I²C or CAN. All communication occurs over CVDD-referenced logic levels (0–5 V), and RX requires an external pull-up to CVDD. BQ756506PAPRQ1 also includes an active-low NFAULT pin for hardware interrupt signaling.

How does the BQ756506PAPRQ1 achieve ASIL D compliance?

The BQ756506PAPRQ1 achieves ASIL D compliance through dual-path hardware redundancy (separate voltage/temperature/current diagnostic chains), systematic design rigor aligned with ISO 26262 Part 5/6, and hardware-level fault coverage exceeding 99% for safety mechanisms. It includes built-in self-test (BIST) for ADCs, memory, and clock domains, plus lockstep monitoring of critical registers. Texas Instruments provides FMEDA reports, safety manuals, and diagnostic coverage metrics to support customer system-level ASIL D certification. BQ756506PAPRQ1 is AEC-Q100 Grade 1 qualified and supports both systematic and hardware ASIL D capability - verified across its full operating range (–40°C to +125°C).

Can the BQ756506PAPRQ1 measure current using a shunt resistor?

Yes, the BQ756506PAPRQ1 supports precision shunt-based current sensing via dedicated SRP and SRN pins, with a ±100-mV input range and 24-bit result resolution (14.9 nV/LSB). It features a dedicated current-sense ADC with programmable gain and digital filtering, and supports synchronization with cell voltage sampling to minimize timestamp misalignment for accurate SOC calculation. The device also provides leakage current specs (<0.2 µA on SRP/SRN) and noise performance (0.71 µV_RMS) validated across temperature. Current measurement is fully integrated - no external op-amps or ADCs are needed. BQ756506PAPRQ1 delivers this capability alongside ±1.5-mV cell voltage accuracy in the same package.