Texas Instruments BQ24032ARHLRG4

Overview

BQ24032ARHLRG4 from Texas Instruments is a single-chip Li-ion linear charger and dynamic power-path management IC for single-cell portable devices. It integrates AC adapter and USB input power selection, autonomous source switching, 4.2-V battery charge regulation, 4.4-V system output regulation, and 3.3-V LDO output. It enables simultaneous system power delivery and battery charging in smartphones and handheld devices.

For engineers reviewing the BQ24032ARHLRG4 datasheet, BQ24032ARHLRG4 pinout, BQ24032ARHLRG4 application, or BQ24032ARHLRG4 equivalent, key selection criteria include DPPM voltage setpoint (2.6–5 V), AC/USB input current limits (up to 2 A / 500 mA), thermal regulation at 115–155 °C, 4.4-V regulated OUT voltage, and QFN-20 package compatibility with PCB layout constraints for thermal pad grounding.

Technical Context

The BQ24032ARHLRG4 implements integrated power FETs (Q1–Q3) for AC-to-OUT, USB-to-OUT, and BAT-to-OUT paths, with dynamic power-path management (DPPM) that scales charge current to maintain OUT voltage ≥2.6 V. Its autonomous power-source selection logic uses PSEL to prioritize USB (low) or AC (high), then falls back to battery when inputs are absent.

Charge control includes precharge (2.9–3.1 V BAT threshold), constant-current fast charge (programmable via ISET1 resistor), and termination (235–265 mV on ISET1 for AC mode). Thermal regulation reduces charge current above 115 °C (Q2) or triggers shutdown at 155 °C (Q1/Q3), while the 3.3-V LDO remains active only when AC or USB is present.

Key Specifications

Pinout & Package

VQFN-20 package with 4.5 mm × 3.5 mm body size and exposed thermal pad (internally connected to VSS). Pad must be soldered to PCB ground plane using 2×3 via matrix per TI thermal guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-cell Li-ion charge and power-path management applications.

Compared with BQ24032ARHLRG4, BQ24035RHLR adds AC overvoltage cutoff but removes USB status signaling, while BQ24038RHLR trades USBPG for voltage-select flexibility - both retain identical DPPM, thermal regulation, and QFN-20 packaging for drop-in layout reuse.

Availability

BQ24032ARHLRG4 is available at Aetrix Electronics and suitable for smartphone power management, digital camera system supply, MP3 player battery charging, handheld industrial scanner, and portable medical device applications requiring stable component supply and long-term lifecycle support.

Supply support for BQ24032ARHLRG4 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 power management ICs for portable and industrial applications.

The bqTINY™ III series-including BQ24032ARHLRG4-is designed for space-constrained single-cell Li-ion/Li-polymer portable devices requiring integrated charging, power-path control, and system rail regulation without external FETs or regulators.

FAQ

What is the regulated output voltage of the BQ24032ARHLRG4 and how is it maintained?

The BQ24032ARHLRG4 regulates its OUT pin to 4.4 V when powered by AC input. This regulation is maintained using an internal P-FET (Q1) with dropout voltage ≤475 mV at 1 A. When USB is the primary source (PSEL = low), the USB input is switched directly to OUT without regulation-unless DPPM activates to reduce charge current and preserve system voltage. The BQ24032ARHLRG4 achieves stable 4.4-V operation across temperature and load variations via closed-loop feedback and thermal-aware current limiting.

How does the BQ24032ARHLRG4 handle power source transitions between AC adapter and USB?

The BQ24032ARHLRG4 uses the PSEL pin to define priority: high selects AC first, low selects USB first. When the primary source is removed, it autonomously switches to the secondary source (or battery) within 50–100 μs, signaled by PG (active-low) and STAT outputs. During transition, the DPPM feature prevents system voltage collapse by scaling charge current. The BQ24032ARHLRG4 ensures uninterrupted system operation without MCU intervention, making it ideal for consumer devices requiring seamless connectivity.

What thermal protection mechanisms are implemented in the BQ24032ARHLRG4?

The BQ24032ARHLRG4 features dual-stage thermal protection: regulation begins at 115–135 °C (Q2 FET) to reduce charge current, and full shutdown occurs at 155 °C (Q1/Q3 FETs) with 30 °C hysteresis. Temperature sensing is internal, referenced to the die junction-not external thermistors. The BQ24032ARHLRG4 also includes thermal derating (21 mW/°C above 40 °C) and requires proper PCB thermal pad connection per TI's RHL package guidelines to sustain 1.81 W power dissipation.

Can the BQ24032ARHLRG4 support battery supplement mode, and how is it triggered?

Yes, the BQ24032ARHLRG4 supports battery supplement mode: when system load exceeds input source capability (e.g., USB at 500 mA), the IC allows battery current to flow into the OUT pin to maintain voltage. It enters supplement mode when V(OUT) drops ≤60 mV below V(BAT), and exits when V(OUT) rises ≥20 mV below V(BAT). This feature is automatic and requires no external control-enabling the BQ24032ARHLRG4 to deliver >500 mA system current from USB alone, extending usability in power-limited scenarios.

What are the key differences between the BQ24032ARHLRG4 and the BQ24038RHLR?

The BQ24032ARHLRG4 fixes 4.2-V battery charge voltage and provides USBPG and ACPG status outputs. The BQ24038RHLR replaces USBPG with VBSEL to select between 4.2-V and 4.36-V charge voltages, and consolidates power-good signaling into a single PG pin active for either source. Both share identical DPPM, OUT regulation (4.4 V), package, and pinout-making them layout-compatible. The BQ24032ARHLRG4 is optimal for standard 4.2-V Li-ion, while BQ24038RHLR suits multi-chemistry or higher-voltage cell requirements.