Texas Instruments BQ50002ARHBT

Overview

BQ50002ARHBT from Texas Instruments is a WPC v1.2-compliant 5-V wireless power transmitter analog front end (AFE), integrating full-bridge MOSFET drivers, synchronous N-channel FETs, variable-frequency oscillator, high-sensitivity 2-channel demodulator, accurate current sense amplifier (50 V/V gain), and 3-V LDO regulator (BP3). It delivers up to 5 W to the receiver and enables >75% system efficiency when paired with bq500511A in smartphone and wearable charging applications.

For engineers reviewing the BQ50002ARHBT datasheet, BQ50002ARHBT pinout, BQ50002ARHBT application, or BQ50002ARHBT equivalent, key selection considerations include its dual-mode control (PWM or self-switching frequency/duty adjustment), ultra-low standby power (<30 mW), Dynamic Power Limiting™ for USB-supplied operation, foreign object detection via input current sensing, and QFN-32 thermal performance (R_θJA = 40.6°C/W).

Technical Context

The BQ50002ARHBT implements a full-bridge power stage with integrated high-side/low-side N-channel MOSFETs (SW1/SW2 switch nodes), bootstrapped gate drivers (BOOT1/BOOT2), and dual independent demodulation channels (DMIN1/DMIN2 → DMOUT1/DMOUT2) for WPC v1.2 receiver communication. Its control interface supports two distinct operating modes: direct PWM control (via PWM1/PWM2 with PWM_CTRL HIGH) or digital command-based self-switching (via CLK_IN/UP_DN/MODE with PWM_CTRL LOW).

It integrates a precision current sense amplifier (CSP/CSN inputs, 50 V/V gain) for real-time input current monitoring used in foreign object detection, and a regulated 3-V LDO (BP3 output, 2.9–3.1 V at –5 to –10 mA) dedicated to powering the companion bq500511A controller. Thermal management is enabled by a 5.00 mm × 5.00 mm QFN package with exposed thermal pad and R_θJB = 13.1°C/W.

Key Specifications

Pinout & Package

The BQ50002ARHBT is housed in a thermally enhanced 5.00 mm × 5.00 mm, 32-pin QFN (RHB) package with exposed thermal pad for PCB heat dissipation. Pin count and layout are optimized for compact wireless power transmitter designs requiring minimal external components.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar wireless power transmitter analog front end applications.

Compared with bq500212ARGER and MP-A20, the BQ50002ARHBT uniquely combines dual-channel demodulation, integrated 3-V LDO, DPL™, and WPC v1.2 A11 compliance in a single AFE - making it the only option that enables certified, high-efficiency, USB-powered 5-W transmitter designs with full FOD capability.

Availability

BQ50002ARHBT is available at Aetrix Electronics and suitable for smartphone wireless charging pads, wearable device docks, and medical sensor bases requiring stable component supply, long-term lifecycle support, and WPC-compliant design assurance.

Supply support for BQ50002ARHBT 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 wireless power technologies, with decades of expertise in power management and interface solutions.

The BQ50002ARHBT belongs to TI's Wireless Power Transmitter AFE product line, engineered specifically to simplify WPC v1.2-compliant 5-V transmitter development by integrating all critical analog functions - eliminating discrete gate drivers, demodulators, and current sense circuits.

FAQ

What is the role of BQ50002ARHBT in a wireless power transmitter system?

The BQ50002ARHBT serves as the analog front end in a two-chip WPC v1.2 wireless power transmitter, handling full-bridge power switching, receiver communication demodulation, input current sensing for foreign object detection, and 3-V LDO regulation for the companion bq500511A controller. It does not operate standalone - BQ50002ARHBT requires bq500511A for digital control, packet decoding, and safety management.

Does BQ50002ARHBT support foreign object detection (FOD)?

Yes, BQ50002ARHBT enables accurate foreign object detection through its integrated current sense amplifier (50 V/V gain) that monitors average input DC current. When paired with bq500511A, the system compares transmitted power against receiver-reported power to detect energy loss caused by metallic objects - BQ50002ARHBT provides the raw current measurement essential for this FOD algorithm.

What package type and thermal characteristics does BQ50002ARHBT have?

BQ50002ARHBT uses a 5.00 mm × 5.00 mm, 32-pin QFN (RHB) package with exposed thermal pad. Its thermal metrics include R_θJA = 40.6°C/W and R_θJB = 13.1°C/W, enabling efficient heat transfer to the PCB. This package supports high-density layouts in space-constrained charging pads while maintaining junction temperatures below 125°C under full 5-W operation with proper copper pour.

Can BQ50002ARHBT operate without the bq500511A controller?

No, BQ50002ARHBT cannot operate autonomously. It lacks embedded firmware, packet decoding, safety state machines, and closed-loop power regulation logic. All digital control - including ping initiation, packet interpretation, FOD decision-making, and power adjustment commands - is handled exclusively by bq500511A. BQ50002ARHBT functions solely as the analog execution layer under bq500511A direction.

What is Dynamic Power Limiting™ (DPL) and how does it work in BQ50002ARHBT?

Dynamic Power Limiting™ (DPL) in BQ50002ARHBT is a hardware-assisted feature that dynamically reduces output power when input voltage droops - such as from a current-limited USB port. It operates by monitoring PVIN and adjusting switching frequency or duty cycle via bq500511A commands. DPL activation is indicated by LED status, and BQ50002ARHBT provides the analog sensing and actuation capability needed for real-time response without software intervention.