Texas Instruments BQ76PL536APAPT

Overview

BQ76PL536APAPT from Texas Instruments is a 3-to-6 series cell lithium-ion battery monitor and secondary protection IC with integrated 14-bit ADC (±1 mV typical accuracy), six cell-balancing control outputs, dual temperature sensing inputs, and stackable SPI-based vertical interface. It operates from 7.2 V to 27 V supply and supports hot-pluggable large-format battery systems such as e-bike packs and UPS modules.

For engineers reviewing the BQ76PL536APAPT datasheet, BQ76PL536APAPT pinout, BQ76PL536APAPT application, or BQ76PL536APAPT equivalent, key selection considerations include its 6-cell voltage monitoring capability, programmable overvoltage/undervoltage/overtemperature protection thresholds, 12 µA sleep current, integrated 5-V REG50 LDO, and HTQFP-64 package with isolated vertical bus for daisy-chained topologies.

Technical Context

The BQ76PL536APAPT integrates two independent ADC subsystems: one dedicated to six cell voltages and brick voltage (14-bit, 6 µs/channel), and another for dual differential temperature sensors and GPAI input. Its protection logic uses non-volatile OTP registers to store user-programmable thresholds and delay times, with dedicated FAULT, ALERT, and DRDY outputs signaling violation events.

Stacking is implemented via current-mode vertical interfaces (CONV_N/S, SCLK_N/S, etc.) that eliminate inter-device isolation components. The device supports both host-controlled SPI (SCLK_H/SDI_H/SDO_H) and autonomous daisy-chain synchronization, enabling up to 192-cell systems using multiple BQ76PL536APAPT units in series.

Key Specifications

Pinout & Package

Package: HTQFP-64 (10.00 mm × 10.00 mm), PowerPAD™ thermal pad soldered to VSS-connected PCB copper area for thermal compliance (R_θJB = 8.1°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ76PL536ATPAPT, the BQ76PL536APAPT offers slightly improved thermal performance in board-mounted applications, while the MAX17853GTP+ trades daisy-chain scalability for embedded fuel-gauging features - making BQ76PL536APAPT the preferred choice for high-reliability, stackable industrial battery systems.

Availability

BQ76PL536APAPT is available at Aetrix Electronics and suitable for electric bike battery management, uninterruptible power supplies, and large-format energy storage systems requiring stable component supply across multi-year production cycles.

Supply support for BQ76PL536APAPT 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 company specializing in analog and embedded processing technologies, with leadership in battery management, power management, and signal chain solutions.

The BQ76PL536APAPT belongs to TI's bq™ battery monitor and protector product line, designed specifically for high-accuracy, stackable, and fault-tolerant lithium-ion battery systems in transportation and industrial energy storage.

FAQ

What is the maximum number of BQ76PL536APAPT devices that can be stacked in a single daisy chain?

The BQ76PL536APAPT supports up to 32 devices in a vertical daisy chain, enabling monitoring of up to 192 series-connected lithium-ion cells (32 × 6). This is achieved through its current-mode vertical interface (CONV_N/S, SCLK_N/S, etc.), which eliminates the need for isolation components between devices and maintains signal integrity across the full stack. Each BQ76PL536APAPT handles local cell measurements while propagating synchronized conversion and data-ready signals to adjacent units.

Does the BQ76PL536APAPT require external passive components for its integrated REG50 LDO?

Yes, the BQ76PL536APAPT requires a 2.2 µF ceramic capacitor connected from the REG50 pin to VSS for stability, as specified in the datasheet. This capacitor must be low-ESR and placed close to the REG50 pin. The LDO delivers up to 25 mA at 5 V (±1%) and is intended to power external circuitry such as microcontrollers or sensors - eliminating the need for a separate 5-V regulator in many BMS designs.

How does the BQ76PL536APAPT handle cell voltage measurement accuracy across temperature?

The BQ76PL536APAPT achieves ±1 mV typical cell voltage accuracy from –10°C to +50°C and ±8 mV over the full –40°C to +85°C operating range. This is enabled by internal trimming and ratiometric referencing to VREF, with 14-bit resolution (~378 µV LSB) ensuring detection of sub-millivolt cell imbalances critical for state-of-charge estimation and balancing control in the BQ76PL536APAPT.

Can the BQ76PL536APAPT perform simultaneous cell voltage and temperature measurements?

Yes, the BQ76PL536APAPT performs true simultaneous sampling across all nine analog inputs - six cell voltages (VC1–VC6), one six-cell brick voltage (VBAT), two temperature channels (TS1±, TS2±), and one general-purpose analog input (GPAI±). Its dual-ADC architecture allows concurrent acquisition without multiplexing delay, ensuring time-aligned data for accurate thermal-voltage correlation in the BQ76PL536APAPT.

What fault conditions trigger the dedicated FAULT_H output on the BQ76PL536APAPT?

The FAULT_H output on the BQ76PL536APAPT asserts low (open-drain) when any programmed protection threshold is violated: overvoltage (COV), undervoltage (CUV), or overtemperature (COT) on any monitored channel. It latches until cleared by host SPI command or power cycle, and responds within 100 µs of threshold breach - providing deterministic, hardware-level fault signaling independent of host firmware execution in the BQ76PL536APAPT.