Texas Instruments BQ50002RHBT

Overview

BQ50002RHBT from Texas Instruments is a WPC v1.2 A11-compliant 5-V wireless power transmitter analog front end (AFE), integrating full-bridge MOSFET drivers, variable-frequency oscillator, dual-channel AM demodulator, high-accuracy current sense amplifier (gain = 50 V/V), and 3-V LDO regulator (BP3) for companion controller supply - designed for use with bq500511 in compact 5-W charging systems for smartphones and wearables.

For engineers reviewing the BQ50002RHBT datasheet, BQ50002RHBT pinout, BQ50002RHBT application, or BQ50002RHBT equivalent, key selection considerations include its integrated FOD-capable current sensing (±14 mV offset), dual demodulation channels for WPC-compliant receiver communication, self-switching frequency control (110–205 kHz), ultra-low standby power (<30 mW), and thermal-enhanced 5.00 mm × 5.00 mm QFN-32 package.

Technical Context

The BQ50002RHBT implements a full-bridge power stage with integrated N-channel MOSFETs (SW1 R_DS(on) = 59–107 mΩ, SW2 R_DS(on) = 39–64 mΩ) and bootstrap regulators (BOOT1/BOOT2), enabling efficient 5-W wireless power delivery. It supports two closed-loop control modes: frequency modulation (110–205 kHz) and duty-cycle adjustment (10–50%), both commanded via PWM1/CLK_IN, PWM2/UP_DN, and MODE pins by the bq500511 controller.

Its dual-channel demodulator accepts modulated coil signals (DMIN1/DMIN2) and outputs digitized 2-kHz packets (DMOUT1/DMOUT2) to the controller, while the current sense amplifier (CSP/CSN) provides real-time input current measurement for foreign object detection (FOD) and Dynamic Power Limiting™ (DPL). The BP3 LDO delivers regulated 3.0 V ±0.1 V at up to 21 mA for external controller biasing.

Key Specifications

Pinout & Package

Package: 5.00 mm × 5.00 mm, 32-pin thermally enhanced QFN (RHB) with exposed thermal pad. Designed for high-power density and efficient PCB heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar wireless power transmitter AFE applications.

Compared with bq51013BRGER and MP-A21, the BQ50002RHBT uniquely enables modular, WPC-certifiable 5-W transmitter design through its dedicated companion-controller interface, integrated BP3 LDO, and dual-channel demodulation - making it optimal for developers prioritizing certification flexibility and ecosystem tool support.

Availability

BQ50002RHBT is available at Aetrix Electronics and suitable for smartphone charging pads, wearable docks, and medical sensor stations requiring stable component supply, WPC v1.2 compliance, and production-ready wireless power AFE functionality.

Supply support for BQ50002RHBT 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, embedded processing, and wireless technologies, with leadership in power management and connectivity solutions.

The BQ50002RHBT belongs to TI's Wireless Power Transmission product line, engineered specifically to simplify WPC-compliant 5-V transmitter design by integrating all critical analog functions - power stage, demodulation, sensing, and regulation - into a single thermally optimized package.

FAQ

What is the primary function of the BQ50002RHBT in a wireless power system?

The BQ50002RHBT serves as the analog front end (AFE) for WPC v1.2 A11-compliant 5-V wireless power transmitters. It integrates the full-bridge power stage, variable-frequency oscillator, dual-channel AM demodulator, current sense amplifier, and 3-V LDO regulator. It must be paired with the bq500511 digital controller to form a complete transmitter solution. The BQ50002RHBT handles all analog signal conditioning, power switching, and real-time sensing - offloading these tasks from the controller and enabling compact, certified 5-W designs.

Does the BQ50002RHBT support standalone operation without the bq500511 controller?

No, the BQ50002RHBT does not support standalone operation. It is explicitly designed as an analog companion to the bq500511 digital controller. All functional modes - including power transfer initiation, frequency/duty-cycle adjustment, FOD response, and LED indication - require command signals (PWM1/CLK_IN, PWM2/UP_DN, MODE, EN, PWM_CTRL) from the bq500511. The BQ50002RHBT contains no embedded firmware, state machine, or communication protocol stack; it relies entirely on the controller for system-level intelligence.

How does the BQ50002RHBT implement Foreign Object Detection (FOD)?

The BQ50002RHBT implements FOD using its integrated current sense amplifier (CSP/CSN inputs) with 50 V/V gain and ±14 mV offset. It continuously monitors average input current drawn from the 5-V supply. When a metallic object enters the magnetic field, power transfer efficiency drops sharply, causing a measurable mismatch between commanded output power and actual input current. This delta triggers the bq500511 to halt transmission. No external ADC, comparator, or calibration memory is required - the BQ50002RHBT delivers raw, high-fidelity current data directly to the controller for real-time analysis.

What are the key thermal design requirements for the BQ50002RHBT?

The BQ50002RHBT uses a 5.00 mm × 5.00 mm QFN-32 package with R_θJA = 40.6 °C/W. For continuous 5-W operation, the PCB must incorporate a minimum 200 mm² copper pour connected to the exposed thermal pad (pin 32), with ≥4 thermal vias (0.3-mm diameter) to inner ground planes. Ambient temperature must remain ≤65°C, and airflow >0.5 m/s is recommended. Derating is required above 85°C junction temperature; the device shuts down at 125°C (T_J max). Thermal performance validation must be performed with actual coil losses and switching frequencies used in the final design.

Can the BQ50002RHBT be used in non-WPC proprietary wireless power systems?

Yes, the BQ50002RHBT supports proprietary systems. Its dual-channel demodulator accepts any amplitude-modulated signal within its input range (–0.3 V to 7 V on DMIN1/DMIN2), and its frequency (110–205 kHz) and duty-cycle (10–50%) control interfaces are fully accessible via PWM/CLK signals. Developers can implement custom communication protocols and power regulation algorithms using the same hardware. However, WPC-specific features like automatic ping sequence timing and Control Error Packet decoding require the bq500511 controller - so proprietary use still needs that companion IC for full functionality.