Texas Instruments BQ24025DRCRG4

Overview

BQ24025DRCRG4 from Texas Instruments is a single-chip Li-ion/Li-polymer linear charger IC with autonomous AC-adapter and USB-port power-source selection, 4.2 V regulation, 1-A max AC charge current, and integrated temperature sensing (TS) and timer enable (TE) inputs. It powers and charges single-cell battery packs in space-constrained portable devices such as smartphones and digital cameras.

For engineers reviewing the BQ24025DRCRG4 datasheet, BQ24025DRCRG4 pinout, BQ24025DRCRG4 application, or BQ24025DRCRG4 equivalent, key selection criteria include its 7-hour fast-charge timer, absence of USB taper timer, TE/TS pin configuration, 3 mm × 3 mm DRC package, and compatibility with 10-kΩ NTC thermistors for battery thermal qualification.

Technical Context

The BQ24025DRCRG4 implements three-phase charging-preconditioning (at 5–100 mA below 2.8–3.2 V), constant-current (up to 1 A from AC, 100/500 mA from USB), and constant-voltage (4.2 V ±1%)-with termination based on minimum current (I_TERM) and backup 7-hour safety timer. It uses internal power FETs and current-sense circuitry without external MOSFETs.

Autonomous source selection prioritizes AC input over USB; USB charge rate is selected via ISET2 (low = 100 mA, high = 500 mA, high-Z = disabled). Unlike bq24026/bq24027, BQ24025DRCRG4 retains taper detection but omits the taper timer (t_TAPER), terminating charge immediately upon reaching I_TAPER threshold (10% of selected ISET1 level).

Key Specifications

Pinout & Package

Package: 10-pin 3 mm × 3 mm MLP (DRC) with exposed thermal pad connected internally to VSS. Requires PCB copper pad and 2×3 via matrix for thermal dissipation (θ_JA = 46.87 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-ion linear charger applications.

Compared with BQ24024DRCRG4 and BQ24026DRCRG4, BQ24025DRCRG4 uniquely offers TE input for disabling the fast-charge timer while retaining TS-based thermal qualification-making it optimal for systems requiring runtime timer suspension without sacrificing battery safety.

Availability

BQ24025DRCRG4 is available at Aetrix Electronics and suitable for smartphones, digital cameras, and MP3 players requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for BQ24025DRCRG4 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 delivering analog, embedded processing, and connectivity technologies for industrial, automotive, and personal electronics markets.

The bqTINY-II product line delivers highly integrated, space-efficient Li-ion/Li-polymer linear chargers with autonomous dual-input power management-designed specifically for ultra-thin portable devices where PCB area and thermal headroom are severely constrained.

FAQ

What is the function of the TE pin on the BQ24025DRCRG4?

The TE (Timer Enable) pin on the BQ24025DRCRG4 is an active-low digital input that controls the 7-hour fast-charge safety timer. When pulled low, the timer operates normally; when held high, the timer is disabled. This allows host systems to suspend timeout behavior during firmware updates or diagnostic modes. The BQ24025DRCRG4 does not reset timers on TE transitions-only CE or power-on reset does so.

Does the BQ24025DRCRG4 support USB charging at 500 mA?

Yes, the BQ24025DRCRG4 supports USB charging at 500 mA when the ISET2 pin is driven high. A low signal on ISET2 selects 100 mA, and a high-impedance (hi-Z) state disables USB charging entirely. This selection is independent of AC input presence and does not require host enumeration-only a logic-level signal. The BQ24025DRCRG4 applies the selected rate during constant-current phase after preconditioning.

How does the BQ24025DRCRG4 handle battery temperature monitoring?

The BQ24025DRCRG4 monitors battery temperature via its TS pin, which sources 96–108 µA to bias a 10-kΩ NTC thermistor. Internal comparators detect voltages below 0.485 V (LTF) or above 2.525 V (HTF), suspending charge if thresholds are exceeded. The allowed operating range maps to approximately 0°C–45°C for standard NTCs. No external ADC or microcontroller is needed-the BQ24025DRCRG4 handles qualification autonomously.

What happens when both AC and USB inputs are present on the BQ24025DRCRG4?

When both AC and USB inputs are present, the BQ24025DRCRG4 autonomously selects the AC adapter as the primary power source for both system operation and battery charging. USB is ignored until AC is removed. This priority is hardwired-no configuration or host command is required. The transition is seamless, with no interruption to system power or charging state, ensuring uninterrupted operation in docking or multi-source environments.

Is the BQ24025DRCRG4 pin-compatible with other bqTINY-II family members?

No, the BQ24025DRCRG4 is not fully pin-compatible with all bqTINY-II variants. While it shares the 10-pin DRC package and core pin assignments (AC, USB, OUT, VSS, STAT1, STAT2, ISET1), it substitutes TE (Pin 7) and TS (Pin 9) for PG or TTE found on other variants like BQ24022 or BQ24023. Pin mapping must be verified against the specific variant's datasheet; direct replacement requires matching TE/TS functionality and confirming absence of conflicting signals (e.g., PG output).