Texas Instruments BQ24071RHLR

Overview

BQ24071RHLR from Texas Instruments is a single-chip Li-ion linear charger and system power-path management IC for space-constrained portable devices. It delivers 6-V regulated system output, supports up to 2-A total current, integrates dynamic power-path management (DPPM), and enables autonomous AC adapter/battery source selection. It powers the system while charging the battery independently-enabling operation with a deeply discharged or absent battery pack in smart phones and handheld devices.

For engineers reviewing the BQ24071RHLR datasheet, BQ24071RHLR pinout, BQ24071RHLR application, or BQ24071RHLR equivalent, key selection considerations include its 6-V system regulation voltage, DPPM set-point scaling (2.6–3.8 V × 1.15 scale factor), thermal regulation at 115 °C, integrated 40-mΩ power FETs, and dual open-drain STAT outputs for charge/fault indication.

Technical Context

The BQ24071RHLR implements a monolithic power-path architecture with two internal P-FETs (Q1 for IN→OUT path, Q2 for BAT→OUT supplement) and autonomous source arbitration logic. Its DPPM circuitry dynamically scales charge current using a 95–105-μA current source into an external resistor to maintain system voltage above V(DPPM-SET) × SF (1.139–1.162).

It operates in three primary functional modes: IN mode (high-MODE pin), USB mode (low-MODE), and sleep mode (CE low). Charge termination uses a precision 230–270-mV threshold on ISET1 with 22.5-ms deglitch timing, while thermal regulation activates at 115 °C (TJ(REG)) and shutdown occurs at 155 °C with 30 °C hysteresis.

Key Specifications

Pinout & Package

VQFN-20 (RHL) package with 3.5 mm × 4.5 mm body size and exposed thermal pad electrically tied to VSS pin (Pin 11); requires PCB thermal via array for reliable 125 °C continuous operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24071RHLR, BQ24072RHLR offers identical power-path control but targets 4.4-V systems, while BQ24075RHLR adds USB detection at the cost of increased firmware dependency-making BQ24071RHLR optimal for fixed 6-V applications requiring minimal host interaction.

Availability

BQ24071RHLR is available at Aetrix Electronics and suitable for smart phones, digital cameras, MP3 players, and internet appliances requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for BQ24071RHLR 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 BQ24071RHLR belongs to TI's bq2407x family of single-chip Li-ion charge and power-path management ICs, designed specifically for space-constrained portable electronics needing autonomous source selection, DPPM, and integrated thermal protection.

FAQ

What is the system output voltage regulation of the BQ24071RHLR?

The BQ24071RHLR regulates its OUT pin to 6.0 V ±0.3 V under normal operating conditions. This fixed 6-V output is distinct from the bq24070 variant (4.4 V) and ensures compatibility with higher-voltage system rails in portable devices. The regulation remains stable across load currents up to 2 A and ambient temperatures from –40 °C to 125 °C, provided thermal limits are observed. BQ24071RHLR achieves this using internal feedback and precision reference circuitry without requiring external compensation components.

How does the DPPM function work in the BQ24071RHLR?

The BQ24071RHLR's Dynamic Power-Path Management (DPPM) monitors the OUT pin voltage and reduces battery charge current when system load causes the voltage to drop toward a preset threshold-calculated as V(DPPM-SET) × SF (1.139–1.162). A 95–105-μA internal current source flows through an external resistor on the DPPM pin to set V(DPPM-SET) between 2.6 V and 3.8 V. This allows the BQ24071RHLR to sustain system operation during peak loads while preserving battery charge time, eliminating brownouts without host intervention.

Can the BQ24071RHLR operate with a missing or defective battery?

Yes, the BQ24071RHLR supports full system operation with no battery or a defective battery. When IN is present, the internal Q1 FET directly powers the OUT rail at 6 V, independent of BAT connection. The IC detects absence of battery voltage and disables charge-related functions while maintaining regulated system output. This capability enables instant-on behavior in devices like smart speakers or portable scanners-even with deeply discharged or removed batteries-making BQ24071RHLR ideal for always-ready applications.

What thermal protection features does the BQ24071RHLR include?

The BQ24071RHLR incorporates two-tier thermal protection: regulation at 115 °C (TJ(REG)) and shutdown at 155 °C (T(SHTDWN)) with 30 °C hysteresis. During regulation, it linearly reduces charge current to maintain junction temperature at 115 °C, allowing continued system operation. Shutdown disables input FETs (Q1/Q3) but leaves the battery FET (Q2) active for supplement mode. Temperature sensing uses the TS pin with 0.485–2.535 V thresholds for cold/hot faults. These features ensure robust operation in sealed enclosures or high-ambient environments without external thermal monitoring.

What are the key differences between BQ24071RHLR and BQ24072RHLR?

The BQ24071RHLR and BQ24072RHLR share identical pinout, package (VQFN-20), DPPM architecture, thermal regulation, and safety features-but differ in system output voltage: BQ24071RHLR regulates to 6.0 V, while BQ24072RHLR regulates to 4.4 V. Both support 4.2-V battery charging and 2-A total current. The 6-V output of BQ24071RHLR suits newer portable systems with higher-voltage PMIC inputs or display drivers, whereas BQ24072RHLR targets legacy 4.4-V designs. No PCB changes are needed for substitution except adjusting output capacitance and checking system rail compatibility.