Texas Instruments BQ24113ARHLR

Overview

BQ24113ARHLR from Texas Instruments is a system-controlled, synchronous switch-mode Li-ion/Li-polymer battery charge-management IC with integrated power FETs. It delivers up to 2-A charge current, supports 1- or 2-cell configurations (4.2 V / 8.4 V), operates at 1.1 MHz fixed frequency, and features high-side current sensing, thermal regulation, and battery temperature monitoring via NTC thermistor interface. It is used in portable medical devices requiring precise, safe, and autonomous charging control.

For engineers reviewing the BQ24113ARHLR datasheet, BQ24113ARHLR pinout, BQ24113ARHLR application, or BQ24113ARHLR equivalent, key selection criteria include its system-controlled architecture (CE/CMODE-driven state management), dual ISET programming for precharge/fast-charge/termination currents, TTC-based programmable safety timer, and VQFN-20 (3.5 mm × 4.5 mm) thermally enhanced package with exposed thermal pad tied to VSS.

Technical Context

The BQ24113ARHLR implements a three-phase charge algorithm-preconditioning (trickle), constant-current (CC), and constant-voltage (CV)-with automatic recharge when battery voltage drops below VOREG – VRCH (75–125 mV/cell). Charge termination is based on user-programmable minimum current detection via ISET2 and backed by a capacitor-programmable TTC timer (25–572 min).

Its synchronous PWM controller drives internal high-side P-channel and low-side N-channel MOSFETs (R_DS(on) = 400–500 mΩ / 130–150 mΩ), enabling >90% efficiency. System control is enabled through CE (active-low enable/sleep), CMODE (precharge/fast-charge selection), and status outputs STAT1/STAT2/PG for host processor or LED interfacing.

Key Specifications

Pinout & Package

Package: 20-pin VQFN (RHL), 3.50 mm × 4.50 mm, 0.5-mm pitch, with exposed thermal pad connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24113ARHLR, the RHLT variant offers identical performance in smaller reels for flexibility, while BQ24113A provides tighter thermal regulation and hysteresis-making it suitable for high-reliability applications where ambient temperature variation exceeds ±15°C.

Availability

BQ24113ARHLR is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, and emergency response radios requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for BQ24113ARHLR 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 and embedded processing technologies, with decades of expertise in power management ICs for mission-critical applications.

The bqSWITCHER™ product line-including BQ24113ARHLR-is designed specifically for highly efficient, integrated Li-ion/Li-polymer charging in space- and thermal-constrained portable systems, emphasizing safety, autonomy, and system-level integration.

FAQ

What is the function of the TTC pin on the BQ24113ARHLR?

The TTC pin on the BQ24113ARHLR accepts an external capacitor to program the total charge safety timer, ranging from 25 to 572 minutes with ±10% accuracy. When the capacitor voltage reaches the internal threshold, the BQ24113ARHLR terminates charging regardless of battery voltage or current-providing a hardware-enforced backup to software-controlled termination. This feature is essential for compliance with UL 2054 and IEC 62368-1 safety standards.

How does the BQ24113ARHLR handle battery temperature monitoring?

The BQ24113ARHLR uses the TS pin with an internal VTSB bias regulator (3.15 V ±10%) to interface with an NTC thermistor voltage divider. It compares the TS voltage against three thresholds-cold (72.8–74.2% VTSB), hot (33.7–35.1% VTSB), and cutoff (28.7–29.9% VTSB)-to suspend charging outside safe thermal zones. Each threshold includes 0.5–1.5% hysteresis and 20–40 ms deglitching to reject noise, ensuring robust JEITA-compliant operation in BQ24113ARHLR-based medical and industrial designs.

Can the BQ24113ARHLR support both 1-cell and 2-cell Li-ion batteries?

Yes, the BQ24113ARHLR supports both 1-cell (4.2 V) and 2-cell (8.4 V) Li-ion or Li-polymer battery configurations. Selection is controlled by the CELLS pin: grounding it configures 4.2 V regulation, while pulling it high (to VCC) selects 8.4 V. The BQ24113ARHLR maintains ±1% voltage regulation accuracy in both modes and automatically adjusts recharge thresholds (VRCH = 75–125 mV/cell) accordingly-enabling flexible battery pack design without hardware changes.

What is the purpose of the SNS pin on the BQ24113ARHLR?

The SNS pin on the BQ24113ARHLR serves as the high-side current-sense input, measuring the voltage drop across an external sense resistor (RSNS) placed between the battery anode and the SNS node. This architecture isolates current sensing from the ground path, allowing accurate charge/discharge current measurement even when system loads share the same battery ground. The BQ24113ARHLR regulates current by maintaining 100 mV (precharge) or 200 mV (fast charge) across RSNS, enabling precise ISET1/ISET2 programming.

Does the BQ24113ARHLR require external MOSFETs for operation?

No, the BQ24113ARHLR integrates both high-side P-channel and low-side N-channel synchronous power MOSFETs, eliminating the need for external switches. Its internal FETs deliver up to 2-A continuous charge current with R_DS(on) values of 400–500 mΩ (P-FET) and 130–150 mΩ (N-FET) across the 4.5–7 V VCC range. This integration reduces solution size, simplifies layout, and improves efficiency-making the BQ24113ARHLR a complete, single-chip charge-management solution for compact portable systems.