Texas Instruments BQ76PL536PAPR

Overview

BQ76PL536PAPR from Texas Instruments is a stackable 3–6 series cell lithium-ion battery monitor and secondary protection IC for EV/HEV battery packs. It integrates a 14-bit, 6-µs ADC with ±3 mV typical cell voltage accuracy, independent overvoltage/undervoltage/overtemperature comparators, and six cell-balancing control outputs. It operates from 7.2 V to 30 V supply and supports industrial temperature range (–40°C to 85°C) in large-format traction battery systems.

For engineers reviewing the BQ76PL536PAPR datasheet, BQ76PL536PAPR pinout, BQ76PL536PAPR application, or BQ76PL536PAPR equivalent, key selection considerations include its vertical SPI stacking capability up to 192 cells, hot-pluggable operation without isolation components, integrated 5-V LDO for user circuitry, and ECC-OTP programmable protection thresholds with dedicated FAULT/ALERT outputs.

Technical Context

The BQ76PL536PAPR implements a precision analog front-end with a factory-trimmed 14-bit SAR ADC supporting nine differential inputs: six cell voltages (VC1–VC6), one six-cell brick voltage (BAT), two temperature sensor channels (TS1±, TS2±), and one general-purpose analog input (GPAI±). Its protection subsystem uses dedicated comparators with programmable thresholds and delay times stored in ECC-OTP memory - fully independent of the ADC path.

It features dual-level communication: a host SPI interface (SCLK_H/SDI_H/SDO_H/CS_H) and bidirectional current-mode vertical interfaces (North/South) enabling daisy-chained stacks without external isolation. All cell balancing outputs (CB1–CB6) are open-drain with external FET/resistor current control and built-in safety timeout.

Key Specifications

Pinout & Package

LQFP-64 PowerPAD™ package with exposed thermal tab (soldered to VSS-connected PCB copper) for thermal management and EMI reduction. Pin count and function mapping validated per TI SLUSA08A datasheet Rev. July 2010.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ76PL455A-Q1 and MAX14920, the BQ76PL536PAPR uniquely combines stackable current-mode daisy-chaining, integrated 5-V LDO, and ECC-OTP-configured hardware protection - making it optimal for cost-sensitive, modular, and serviceable large-format battery systems where isolation-free scalability is required.

Availability

BQ76PL536PAPR is available at Aetrix Electronics and suitable for electric vehicle traction packs, e-bike battery management systems, and uninterruptible power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical deployments.

Supply support for BQ76PL536PAPR 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 and industrial BMS expertise.

The BQ76PL536 product line was designed specifically for high-reliability, stackable lithium-ion battery monitoring in EV, HEV, and large-format energy storage - emphasizing hardware autonomy, thermal robustness, and system-level integration.

FAQ

What is the maximum number of BQ76PL536PAPR devices that can be stacked vertically?

The BQ76PL536PAPR supports vertical daisy-chaining of up to 32 devices per stack, enabling monitoring of up to 192 cells (32 × 6S) without external isolation components. This is achieved via current-mode North/South interfaces (SCLK_N/SDI_N/SDO_N/CS_N and SCLK_S/SDI_S/SDO_S/CS_S) with propagation delays specified at ≤30 ns per stage - verified in TI SLUSA08A Rev. July 2010 Section 7.5.

Does the BQ76PL536PAPR require external components to configure its overvoltage protection thresholds?

No. The BQ76PL536PAPR stores all overvoltage, undervoltage, and overtemperature protection thresholds and delay times in on-chip Error Check/Correct (ECC) OTP EPROM memory. Configuration is performed once during manufacturing using the VPROG pin (6.3–7.7 V) and does not require external resistors, capacitors, or EEPROM - ensuring permanent, tamper-resistant safety settings for the lifetime of the BQ76PL536PAPR.

Can the BQ76PL536PAPR operate without a host microcontroller?

Yes. The BQ76PL536PAPR provides fully autonomous secondary protection: its dedicated comparators trigger FAULT_H and ALERT_H outputs independently of the SPI host interface or ADC operation. While the host is required for cell balancing control and telemetry readout, safety-critical cutoff functions remain active even if the host fails or is disconnected - a core design requirement confirmed in the "DESCRIPTION" section of the BQ76PL536PAPR datasheet.

What is the accuracy specification for cell voltage measurement on the BQ76PL536PAPR?

The BQ76PL536PAPR achieves ±3 mV typical cell voltage accuracy across –40°C to +85°C, as measured on VCn–VCn−1 inputs (n = 1 to 6) with 6-µs conversion time and factory trimming enabled. This specification is explicitly stated in the "FEATURES" list and "ANALOG-TO-DIGITAL CONVERTER" section of the official datasheet (SLUSA08A), and applies directly to the BQ76PL536PAPR in its standard LQFP-64 PowerPAD™ package.

How does the BQ76PL536PAPR handle thermal monitoring with two temperature inputs?

The BQ76PL536PAPR provides two differential temperature sensor inputs (TS1± and TS2±), each supporting NTC thermistors or RTDs. Both channels feed into the same 14-bit ADC with ±0.25% ratio accuracy (0.25 V–2.5 V input range) and <150 µVRMS noise. The device allows independent configuration of OT thresholds and delays per channel - enabling dual-zone thermal supervision (e.g., top/bottom cell layers) within a single BQ76PL536PAPR instance.