Texas Instruments BQ500211RGZR

Overview

BQ500211RGZR from Texas Instruments is a Qi-compliant wireless power transmitter manager IC for 5-V WPC Type A5/A11 systems. It integrates digital demodulation, dynamic power limiting (DPL), PWM control outputs (DPWM-A/B), analog sensing (V_SENSE/I_SENSE/T_SENSE), and LED/buzzer status indication. It enables intelligent, fault-monitored wireless charging in mobile phone and tabletop charger applications.

For engineers reviewing the BQ500211RGZR datasheet, BQ500211RGZR pinout, BQ500211RGZR application, or BQ500211RGZR equivalent, key selection considerations include WPC 1.0.3 compliance, 112–205 kHz switching frequency range, dual 3.3-V supply domains (V33D/V33A), 48-pin QFN package with thermal pad, and integrated DPL for USB-limited sources.

Technical Context

The BQ500211RGZR implements closed-loop power regulation via frequency-shift control (112–205 kHz) in response to AM-modulated communication packets from WPC receivers. Its internal digital demodulator processes COMM_A±/COMM_B± inputs to decode receiver commands without external analog front-end components.

It features dual-domain power management: V33D supplies digital logic and I²C interface, while V33A powers analog sensing and demodulation circuitry. The device supports two operational modes-dynamic power limiting (via LoPWR pin) and constant-current USB mode-and includes comprehensive fault handling with LED_MODE-driven status reporting and thermal shutdown via T_SENSE.

Key Specifications

Pinout & Package

The BQ500211RGZR is housed in a 48-pin, 7 mm × 7 mm QFN package with exposed thermal pad (EPAD). The package supports high-power dissipation in compact wireless charging designs and requires PCB copper flooding and thermal vias to GND for junction temperature control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ500211RGZR, bq500212RGZR offers enhanced thermal robustness and automotive qualification while maintaining full functional and pin compatibility-ideal for production upgrades. bq51013BRGER serves a complementary role as a receiver IC, enabling system-level validation but not substituting transmitter functionality.

Availability

BQ500211RGZR is available at Aetrix Electronics and suitable for mobile phone charging pads, tabletop wireless chargers, hermetically sealed tool chargers, and automotive interior charging surfaces requiring stable component supply and long-term lifecycle support.

Supply support for BQ500211RGZR 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 delivering analog and embedded processing solutions, with leadership in power management and wireless connectivity technologies.

The BQ500211RGZR belongs to TI's Wireless Power Transmitter family, designed specifically to simplify Qi-compliant transmitter implementation by integrating digital control, demodulation, and system monitoring in a single IC.

FAQ

What is the primary function of the BQ500211RGZR in a wireless charging system?

The BQ500211RGZR functions as a complete WPC-compliant wireless power transmitter manager IC. It controls the power stage via DPWM-A/B outputs, digitally demodulates receiver communication packets from COMM_A±/COMM_B± inputs, implements dynamic power limiting (DPL), monitors system parameters using V_SENSE/I_SENSE/T_SENSE, and drives LED/buzzer status indicators. It handles all protocol-level interactions defined in WPC 1.0.3, including ping, packet decoding, and fault response-making it the central intelligence unit for Qi-certified transmitter designs.

Does the BQ500211RGZR support both WPC Type A5 and Type A11 transmitter configurations?

Yes, the BQ500211RGZR supports both WPC Type A5 (with magnetic positioning guide) and Type A11 (no magnetic guide) transmitter configurations. Its firmware and control logic are designed to adapt ping sequences, alignment detection methods, and power ramp profiles accordingly. The distinction is handled internally-no hardware changes or pin strapping is required to switch between modes. This dual-mode capability allows a single BQ500211RGZR design to serve both magnet-guided smartphone pads and open-area tabletop chargers.

How does Dynamic Power Limiting (DPL) operate in the BQ500211RGZR?

Dynamic Power Limiting (DPL) in the BQ500211RGZR operates by continuously monitoring V_SENSE and adjusting the switching frequency to maintain stable input voltage under variable load conditions. When the LoPWR pin is pulled to GND, the device enters 500-mA USB mode and actively limits output power to prevent input droop. If V_SENSE falls below threshold, the BQ500211RGZR increases operating frequency (up to 205 kHz) to reduce power transfer-ensuring compatibility with current-limited 5-V sources. DPL status is indicated visually via LED_MODE-defined blink patterns and can trigger BUZ_AC/BUZ_DC alerts.

What are the critical PCB layout requirements for the BQ500211RGZR's COMM inputs?

The COMM_A± and COMM_B± inputs of the BQ500211RGZR require matched-length, tightly coupled differential PCB traces with controlled impedance (~100 Ω differential) and minimal stubs or vias. These pins carry weak AM-demodulated signals from the transmitter coil and are highly susceptible to noise. Layout best practices include routing away from switching nodes (DPWM-A/B, power inductors), placing 100-pF AC-coupling capacitors close to the pins, and guarding the traces with ground pours tied to GND via multiple vias. Improper COMM layout directly degrades packet reception reliability and may cause intermittent communication failures with WPC receivers.

Is the BQ500211RGZR recommended for new designs?

No-the BQ500211RGZR is marked "Not Recommended For New Designs" in its official Texas Instruments datasheet (SLUSAO2, June 2012). TI recommends migrating to the pin-compatible successor bq500212RGZR, which offers improved thermal performance, updated firmware, and AEC-Q100 Grade 3 qualification for automotive use. While the BQ500211RGZR remains available for legacy support and existing production, new designs should evaluate bq500212RGZR to ensure long-term supply continuity and access to validated enhancements. Aetrix Electronics supports both parts for transition planning and obsolescence mitigation.