Texas Instruments BQ24195LRGER

Overview

BQ24195LRGER from Texas Instruments is an I²C-controlled, single-cell Li-ion/Li-polymer switch-mode charger and power path manager with integrated 2.5-A charging, 5.1-V/1-A synchronous boost, and NVDC power path. It supports USB 2.0/3.0 compliance, D+/D− detection, and operates from 3.9 V to 17 V input. Used in smartphones and tablets for autonomous battery management and system power backup.

For engineers reviewing the BQ24195LRGER datasheet, BQ24195LRGER pinout, BQ24195LRGER application, or BQ24195LRGER equivalent, key selection considerations include its 2.5-A fast-charge capability, 5.1-V/1-A boost output, ±0.5% charge voltage accuracy, thermal regulation at 120°C, and QFN-24 (4.0 mm × 4.0 mm) package with exposed thermal pad.

Technical Context

The BQ24195LRGER integrates a synchronous buck charger and a synchronous boost converter sharing internal MOSFETs and power path logic. Its NVDC architecture maintains SYS above 3.5 V even with depleted or absent battery, enabling instant-on operation. The device uses I²C for full configuration of charge voltage (4.112 V or 4.208 V), input current limit (100 mA–3 A), and safety timers.

It implements dual-stage temperature qualification via TS1/TS2 pins with programmable cold/hot thresholds referenced to REGN, and features autonomous charging phases-preconditioning, constant-current, and constant-voltage-with termination at 20% of fast-charge current. Thermal regulation reduces charge current above 120°C junction temperature.

Key Specifications

Pinout & Package

VQFN-24 package (4.00 mm × 4.00 mm) with exposed thermal pad soldered to PGND for thermal management and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-cell Li-ion charger with boost applications.

Compared with BQ24195LRGER, the BQ24196RGER offers higher current capability in identical packaging, while the BQ25601DRGER shifts focus to USB-C PD with added protocol stack but requires redesign of both schematic and firmware.

Availability

BQ24195LRGER is available at Aetrix Electronics and suitable for smartphone power management, tablet battery backup, and portable media player designs requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.

Supply support for BQ24195LRGER 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 BQ24195LRGER belongs to TI's bq2419x family of highly integrated battery charge management ICs, designed specifically for space-constrained portable devices requiring autonomous charging, power path control, and USB OTG capability.

FAQ

What is the maximum continuous charge current supported by the BQ24195LRGER?

The BQ24195LRGER supports a maximum continuous fast-charge current of 2.5 A. This value is factory-set and cannot be increased via I²C registers. At 2 A, charging efficiency reaches 92%; at 4 A it would be 90%, but the BQ24195LRGER does not support 4 A - that rating applies only to the non-L variant (BQ24195). The 2.5-A limit ensures thermal stability within the 4-mm QFN package under typical ambient conditions.

Does the BQ24195LRGER support USB Battery Charging Specification 1.2?

Yes, the BQ24195LRGER fully supports USB Battery Charging Specification 1.2 through hardware-based D+/D− detection. It performs data contact detection (DCD) and primary detection to identify SDP, CDP, and DCP sources, automatically configuring input current limits (e.g., 100 mA for SDP, 1.5 A for DCP). No host processor intervention is required for basic USB port classification.

Can the BQ24195LRGER operate without an I²C host controller?

Yes, the BQ24195LRGER supports autonomous operation without I²C. Default settings - including 4.208-V charge voltage, 2.5-A charge current, and 3.5-V minimum system voltage - are active at power-up. All charging phases (preconditioning, constant-current, constant-voltage) and safety functions (thermal regulation, safety timer, overvoltage protection) function independently of I²C communication.

What is the purpose of the REGN pin on the BQ24195LRGER?

The REGN pin on the BQ24195LRGER outputs a regulated 4.8-V bias supply (±2% tolerance) capable of delivering up to 50 mA. It powers internal circuitry and serves as the reference voltage for the TS1 and TS2 thermistor comparators. A 4.7-µF ceramic capacitor must be placed between REGN and analog ground, located close to the IC, to ensure stable operation and accurate temperature sensing.

How does the BQ24195LRGER handle battery removal during system operation?

The BQ24195LRGER maintains system operation during battery removal via its NVDC power path architecture. When battery is disconnected or deeply discharged, the device regulates SYS above 3.5 V using input power (VBUS), allowing the host system to remain powered. The STAT pin indicates "no battery" condition via a specific blink pattern (2× slow blink), and the INT pin asserts if system voltage falls below the programmed VSYS_MIN threshold.