Texas Instruments BQ24103ARHLTG4

Overview

BQ24103ARHLTG4 from Texas Instruments is a synchronous switched-mode Li-ion/Li-polymer battery charge-management IC with integrated power FETs, supporting 1- or 2-cell configurations (4.2 V or 8.4 V), 2-A max charge current, 1.1-MHz fixed-frequency PWM control, and high-side current sensing via external sense resistor. It enables compact, efficient charging in portable media players and handheld medical devices.

For engineers reviewing the BQ24103ARHLTG4 datasheet, BQ24103ARHLTG4 pinout, BQ24103ARHLTG4 application, or BQ24103ARHLTG4 equivalent, key selection considerations include programmable precharge/termination thresholds via ISET1/ISET2, thermal monitoring via TS input, status signaling through open-drain STAT1/STAT2 outputs, and compatibility with VQFN-20 (3.5 mm × 4.5 mm) PCB layouts requiring thermal pad grounding.

Technical Context

The BQ24103ARHLTG4 implements a synchronous buck topology with integrated high-side P-channel and low-side N-channel MOSFETs, operating at 1.1 MHz with 0%–100% duty cycle control. It executes three-phase charging-preconditioning, constant-current, and constant-voltage-with termination based on user-set minimum current threshold and optional safety timer.

Charge regulation uses high-side current sensing (SNS–BAT differential ≤ ±1 V) and analog feedback (VTSB bias regulator for NTC thermistor interface). Status outputs (STAT1, STAT2, PG) provide real-time indication of charge-in-progress, completion, adapter presence, and fault conditions without host processor intervention.

Key Specifications

Pinout & Package

VQFN-20 package with 3.5 mm × 4.5 mm body size and exposed thermal pad electrically connected to VSS. Requires solder connection of thermal pad to PCB ground plane for thermal performance (R_θJB = 15.8°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24103ARHLTG4, BQ24103ARHLR offers identical performance in volume packaging, while BQ24103A lacks RoHS compliance-making the G4-suffixed part the default choice for new designs targeting global markets.

Availability

BQ24103ARHLTG4 is available at Aetrix Electronics and suitable for portable medical devices, handheld industrial terminals, and consumer media players requiring stable component supply, RoHS-compliant sourcing, and long-term lifecycle support.

Supply support for BQ24103ARHLTG4 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 U.S.-based semiconductor company specializing in analog and embedded processing technologies, with leadership in power management ICs for battery-powered systems.

The bqSWITCHER™ product line-including BQ24103ARHLTG4-is designed specifically for highly efficient, integrated Li-ion/Li-polymer charging in space-constrained portable applications, emphasizing thermal robustness and system-level integration.

FAQ

What is the function of the TTC pin on the BQ24103ARHLTG4?

The TTC pin on the BQ24103ARHLTG4 connects to an external capacitor that sets the programmable charge timer duration (25–572 minutes). When the timer expires, the device terminates charging as a safety backup-even if current-based termination has not occurred. The pin must be pulled low to disable timing functionality, and its enable threshold is 200 mV. This feature ensures fail-safe operation in systems lacking host-level charge supervision.

How does the BQ24103ARHLTG4 handle battery temperature monitoring?

The BQ24103ARHLTG4 monitors battery temperature via the TS pin using an NTC thermistor voltage divider powered by the VTSB pin (3.15 V regulated output). Internal comparators detect cold (72.8–74.2% of VTSB), hot (33.7–35.1%), and cutoff (28.7–29.9%) thresholds, each with 20–40 ms deglitch timing. If temperature falls outside the safe window, charging halts and STAT outputs reflect the fault condition-enabling compliance with JEITA battery safety standards.

Can the BQ24103ARHLTG4 support both single-cell and two-cell Li-ion batteries?

Yes, the BQ24103ARHLTG4 supports both configurations via the CELLS pin: grounding it selects 4.2 V regulation for single-cell operation, while pulling it high to VCC configures 8.4 V for two-cell packs. This flexibility allows one BQ24103ARHLTG4 design to serve multiple battery architectures without hardware changes-reducing BOM count and simplifying inventory management across product variants.

What is the purpose of the SNS and BAT pins on the BQ24103ARHLTG4?

The SNS pin measures the voltage drop across an external sense resistor (RSNS) to regulate charge current with ±10% accuracy, while the BAT pin senses battery voltage for CC/CV transition and recharge detection. Both pins require 0.1 μF ceramic bypass capacitors to PGND (SNS) or VSS (BAT) to suppress noise. Their separation enables high-side current sensing-avoiding ground-path disruption and preserving signal integrity in noisy switch-mode environments.

Does the BQ24103ARHLTG4 include reverse current protection?

Yes, the BQ24103ARHLTG4 incorporates reverse leakage protection that prevents battery discharge through the IN pins when the input adapter is disconnected. This feature maintains battery voltage during standby and extends shelf life-critical for portable equipment left unused for extended periods. The protection operates automatically without external components or configuration, leveraging internal circuitry to block reverse current paths while preserving low quiescent current (5–7.7 μA) in sleep mode.