Texas Instruments BQ24753ARHDR

Overview

BQ24753ARHDR from Texas Instruments is a host-controlled synchronous buck Li-ion/Li-polymer battery charger IC with integrated system power selector, supporting 2–4 series cells, up to 10 A charge current, ±0.5% voltage regulation accuracy, and 300 kHz switching frequency for notebook and ultra-mobile computing applications.

For engineers reviewing the BQ24753ARHDR datasheet, BQ24753ARHDR pinout, BQ24753ARHDR application, or BQ24753ARHDR equivalent, key selection considerations include adapter current DPM control via ACSET, ratiometric programming using VDAC, reverse-conduction protection, thermal shutdown at 155°C, and 5×5-mm VQFN package compatibility with high-density portable PCB layouts.

Technical Context

The BQ24753ARHDR implements a NMOS-NMOS synchronous buck converter with 30-ns minimum dead-time and 99.5% maximum effective duty cycle, enabling >95% efficiency across 8–24 V adapter input range. Its dual-path gate drivers (ACDRV/BATDRV) support automatic system power selection between AC/DC adapter and battery while enforcing break-before-make logic to prevent shoot-through.

Dynamic Power Management (DPM) operates by monitoring IADAPT - a 20× gain current-sense amplifier output - to reduce charge current when input power demand exceeds the ACOC limit set by ACSET. Input overvoltage protection (OVP) is independently programmable via OVPSET, and ACOP provides latched overpower protection triggered at 2 V on the ACOP pin.

Key Specifications

Pinout & Package

VQFN-28 (RHD) package with 5.0 mm × 5.0 mm body, 0.5 mm pitch, and exposed thermal pad soldered to PCB for thermal and ground integrity. Pin 1 marked by dot; top-side marking includes "BQ24753A" and date code.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery charger and system power selector applications.

Compared with BQ24750ARHDR and BQ24780SRHBT, the BQ24753ARHDR uniquely balances analog programmability, latchable ACOP protection, and LEARN-mode support in a compact 28-pin VQFN - making it optimal for mid-tier notebooks and medical portables needing robust yet host-flexible power management.

Availability

BQ24753ARHDR is available at Aetrix Electronics and suitable for notebook computers, ultra-mobile PCs, portable medical diagnostics equipment, and battery bay chargers requiring stable component supply, long-lifecycle support, and TI-qualified automotive/industrial grade reliability.

Supply support for BQ24753ARHDR 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 ICs, with decades of expertise in battery charging and power-path architectures.

The BQ24753ARHDR belongs to TI's bq247xx family of host-controlled multi-cell Li-ion chargers designed specifically for space-constrained, high-efficiency portable computing and medical devices requiring precision regulation and intelligent power-source arbitration.

FAQ

What is the primary function of the BQ24753ARHDR in a notebook power system?

The BQ24753ARHDR serves as the core battery charger and system power selector in notebook designs. It controls external NMOS/NMOS synchronous buck converters to charge 2–4 series Li-ion cells, regulates voltage and current with ±0.5% and ±3% accuracy respectively, and automatically selects between AC adapter and battery power using ACDRV and BATDRV gate drivers - all within a single 5×5-mm VQFN package.

How does the BQ24753ARHDR implement Dynamic Power Management (DPM)?

The BQ24753ARHDR implements DPM by continuously monitoring adapter current via its 20× gain IADAPT amplifier (fed by ACP/ACN). When sensed current exceeds the ACOC limit set by the ACSET pin voltage, the IC reduces charge current in real time to prevent adapter overload while maintaining system operation - ensuring stable power delivery even under peak CPU/GPU loads.

Can the BQ24753ARHDR support battery recalibration, and how is it activated?

Yes, the BQ24753ARHDR supports battery recalibration through its dedicated LEARN pin. When LEARN is driven high while an adapter is present, the IC disables charging, disconnects the adapter (ACDRV off), and connects the battery to the system (BATDRV on) - allowing controlled discharge to recalibrate gas gauge ICs. This mode is essential for accurate runtime estimation in portable medical and computing devices.

What protection features are built into the BQ24753ARHDR?

The BQ24753ARHDR integrates multiple hardware protections: programmable input overvoltage (OVPSET), latched AC overpower (ACOP), thermal shutdown at 155°C, battery overvoltage/undervoltage detection, synchronous-to-nonsynchronous transition control, and reverse-conduction blocking. These operate autonomously without host intervention, ensuring safe operation during fault conditions such as adapter failure or thermal stress.

Is the BQ24753ARHDR compatible with both resistor-based and DAC-based programming?

Yes, the BQ24753ARHDR supports ratiometric programming via VDAC for charge voltage (VADJ), charge current (SRSET), and adapter current limit (ACSET). Each input accepts either a resistor divider referenced to VDAC (3.3 V) or a DAC output supplied from VDAC - providing design flexibility for cost-sensitive resistor-based systems or precision DAC-controlled platforms.