Texas Instruments BQ51013ARHLT

Overview

BQ51013ARHLT from Texas Instruments is a Qi v1.0–compliant integrated wireless power receiver IC for portable electronics, delivering a regulated 5 V / 1.5 A DC output from inductively coupled AC input. It integrates full synchronous rectification, low-dropout regulation, WPC communication control, dynamic rectifier voltage scaling (VRECT thresholds 1–4), and thermal shutdown - enabling complete contactless charging in smartphones, headsets, and media players.

For engineers reviewing the BQ51013ARHLT datasheet, BQ51013ARHLT pinout, BQ51013ARHLT application, or BQ51013ARHLT equivalent, this device serves as a stand-alone digital controller for WPC-compliant 5 W receiver systems requiring high-efficiency AC–DC conversion, adaptive communication current limiting, and robust overvoltage protection at RECT (15 V clamp) and AD (12.5 V OVP for bq51014 only).

Technical Context

The BQ51013ARHLT implements a closed-loop Qi v1.0 communication system using backscatter modulation via COM1/COM2 pins at 2 kb/s, with adaptive current limiting (350–435 mA during communication, hold-off time = 1 s). Its dynamic rectifier control adjusts VRECT setpoints (5.11 V to 7.08 V) based on real-time load current to optimize transient response without external compensation.

It features a dual-mode synchronous rectifier (full sync up to 100 mA, half-sync above 125 mA), integrated 1.5 Ω R_DS(ON) COM FETs, and a programmable hardware current limit (I_ILIM) set by an external resistor on ILIM pin (R_ILIM = 250 Ω / I_MAX). Thermal protection triggers at 155 °C with 20 °C hysteresis, and NTC/CTRL functionality supports temperature monitoring and end-power-transfer signaling.

Key Specifications

Pinout & Package

Package: 4.5 mm × 3.5 mm QFN-20 (RHL), thermally enhanced with exposed PGND pad (θ_JA = 37.7 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with bq51014RHLT and MP-A21, the BQ51013ARHLT delivers the simplest path to Qi v1.0 certification with zero firmware overhead, best-in-class 93% efficiency at 5 W, and minimal external component count - making it ideal for volume production of smartphones, headsets, and portable media devices.

Availability

BQ51013ARHLT is available at Aetrix Electronics and suitable for smartphone wireless charging, portable headset power management, and digital camera battery charging requiring stable component supply and full WPC v1.0 compliance.

Supply support for BQ51013ARHLT 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 solutions, with decades of automotive- and industrial-grade reliability validation.

The bq5101x product line was designed specifically for Qi-compliant wireless power receivers in portable consumer electronics, integrating all essential functions - rectification, regulation, communication, and protection - into a single monolithic IC.

FAQ

What is the maximum continuous output current supported by the BQ51013ARHLT?

The BQ51013ARHLT supports a maximum continuous output current of 1.5 A at its regulated 5 V output, verified across –40°C to 125°C junction temperature range. This rating assumes proper thermal management using the QFN-RHL package's exposed thermal pad and recommended PCB copper area per TI SLUSAY6B layout guidelines. The BQ51013ARHLT maintains regulation within ±2% even at full 1.5 A load.

Does the BQ51013ARHLT support both capacitive and resistive load modulation for WPC communication?

Yes, the BQ51013ARHLT supports both capacitive and resistive load modulation via its COM1 and COM2 pins. For capacitive modulation, connect each COM pin through a capacitor to AC1 or AC2 (cross-coupled); for resistive modulation, tie both COM1 and COM2 to the RECT node via a single resistor. The internal 2 kb/s bi-phase encoder handles packet formatting per WPC v1.0, and the BQ51013ARHLT automatically selects modulation type based on external component configuration.

How does the dynamic rectifier control in the BQ51013ARHLT improve transient response?

The BQ51013ARHLT implements dynamic rectifier control by adjusting the VRECT regulation target across four discrete thresholds (5.11 V, 5.53 V, 6.28 V, 7.08 V) based on real-time output current. During a 1 A load step, this algorithm raises VRECT preemptively to maintain sufficient headroom for the LDO, reducing output droop by >60% compared to fixed-threshold receivers. The BQ51013ARHLT executes this without external compensation or host intervention.

Is the BQ51013ARHLT pin-compatible with the bq51014RHLT?

No, the BQ51013ARHLT is not pin-compatible with the bq51014RHLT. While both use the same QFN-RHL-20 package footprint, the TERM pin (pin 10) on bq51014RHLT is functional for CS100 termination, whereas on BQ51013ARHLT that pin is reserved as EN1 and shares logic with EN2 for charging mode control. Swapping them requires PCB redesign and firmware revalidation due to differing pin functions and internal feature enablement.

What protection features are integrated into the BQ51013ARHLT?

The BQ51013ARHLT integrates six core protections: (1) 15 V overvoltage clamp at RECT via CLMP1/CLMP2 FETs; (2) thermal shutdown at 155 °C with 20 °C hysteresis; (3) undervoltage lockout at 2.7 V; (4) rectifier reverse-voltage protection (V_RECT-REV = 9 V); (5) hardware current limit set by ILIM resistor; and (6) deglitched short-circuit detection with 1 ms blanking. All operate autonomously without host MCU involvement - a key differentiator of the BQ51013ARHLT.