Texas Instruments BQ24070RHLT

Overview

BQ24070RHLT from Texas Instruments is a single-chip Li-ion linear charger and system power-path management IC in a 3.5-mm × 4.5-mm VQFN-20 package. It delivers 4.4-V regulated system output, supports up to 1.5-A battery charge current, integrates dynamic power-path management (DPPM), and enables autonomous AC adapter/battery source selection for portable devices with deeply discharged or absent batteries.

For engineers reviewing the BQ24070RHLT datasheet, BQ24070RHLT pinout, BQ24070RHLT application, or BQ24070RHLT equivalent, key selection considerations include its 4.4-V system regulation voltage, DPPM set-point scaling (2.6–3.8 V × 1.15), thermal regulation at 115°C, ±0.5% battery voltage accuracy, and dual-mode (AC/USB) input current control via MODE/ISET2 pins.

Technical Context

The BQ24070RHLT implements a dual-FET power-path architecture with independent control of Q1 (IN→OUT) and Q2 (BAT→OUT). Its DPPM loop dynamically scales charge current using an external resistor on the DPPM pin and an internal 100-μA current source scaled by 1.15 to maintain system voltage above V(DPPM-REG) = V(DPPM-SET) × SF.

It operates in three primary functional modes: IN mode (high-MODE, up to 2-A total input), USB mode (low-MODE, 100/500-mA input limit), and sleep mode (CE low, 2–5-μA BAT standby current). Charge termination uses a precision 250-mV threshold on ISET1 with 22.5-ms deglitch timing, and thermal regulation activates at 115°C junction temperature to reduce charge current without disabling system power.

Key Specifications

Pinout & Package

VQFN-20 package with exposed thermal pad (VSS pin 11); 0.5-mm pitch, 0.8-mm max height; RoHS-compliant, halogen-free.

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 BQ24070RHLT, the BQ24072RHLT omits critical DPPM control-requiring external compensation for input current limiting-while the BQ24075RHLR offers identical functionality in reel format with minor thermal spec relaxation, making it a direct production alternative.

Availability

BQ24070RHLT is available at Aetrix Electronics and suitable for smartphone power management, digital camera charging, MP3 player battery backup, and internet appliance UPS functions requiring stable component supply across design-in, prototyping, and production phases.

Supply support for BQ24070RHLT 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 power management technologies, with over 50 years of innovation in energy-efficient IC design.

The BQ24070RHLT belongs to TI's bq2407x family of single-chip Li-ion chargers, engineered specifically for space-constrained portable electronics needing autonomous power-path control, battery health preservation, and seamless AC/USB source transition.

FAQ

What is the system output voltage regulation accuracy of the BQ24070RHLT?

The BQ24070RHLT regulates its OUT pin to 4.4 V with a typical tolerance of ±0.1 V across temperature and load. This specification ensures stable power delivery to downstream 3.3-V or 5-V logic rails without requiring additional regulation. The BQ24070RHLT achieves this via an internal precision bandgap reference and low-drift error amplifier, maintaining consistent performance from –40°C to 125°C junction temperature.

How does the BQ24070RHLT handle a deeply discharged battery during system startup?

The BQ24070RHLT enables instant system turn-on from an external power source-even with a 0-V battery-by powering the OUT rail directly from the IN supply through Q1. It then initiates precharge at 10–150 mA once BAT voltage exceeds 2.9 V, preventing lithium plating. This behavior is intrinsic to the BQ24070RHLT's power-path architecture and requires no host intervention or firmware configuration.

Can the BQ24070RHLT be used with a 6-V system output requirement?

No-the BQ24070RHLT is factory-configured for 4.4-V system output regulation. For 6-V operation, TI specifies the pin-compatible BQ24071RHLT, which shares identical package, pinout, and functional architecture but delivers 6.0–6.3 V at OUT. Substituting BQ24070RHLT in a 6-V design will result in undervoltage and system malfunction; the BQ24070RHLT must be used only where 4.4-V system rail compliance is confirmed.

What protection features are integrated into the BQ24070RHLT?

The BQ24070RHLT integrates reverse current blocking, short-circuit protection (10-mA BAT→OUT current limit), thermal regulation (115°C activation), overtemperature shutdown (155°C), UVLO (2.5-V lockout), and battery temperature monitoring via TS pin. These protections operate autonomously without software-ensuring robust operation in consumer handhelds where environmental stress and user misuse are common failure vectors for the BQ24070RHLT.

Is the BQ24070RHLT RoHS-compliant and halogen-free?

Yes-the BQ24070RHLT is RoHS-compliant with lead concentration ≤0.1% by weight and uses halogen-free packaging materials (Br/Sb ≤0.1%). Its VQFN-20 package meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) and supports standard lead-free reflow profiles. This compliance is documented in TI's official SLUS694G datasheet and verified in the orderable addendum for the BQ24070RHLT.