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Texas Instruments BQ24105RHLRG4
- Part No.:
- BQ24105RHLRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
BQ24105RHLRG4.pdf
- Description:
- IC BAT CHG MULTCHEM 1-3CL 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,730
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Product details
Overview
BQ24105RHLRG4 from Texas Instruments is a synchronous switched-mode Li-ion/Li-polymer and LiFePO₄ battery charge-management IC with integrated power FETs, 1.1-MHz fixed-frequency PWM controller, 2-A max charge current, ±0.5% voltage regulation accuracy, and programmable termination via ISET2. It operates in conditioning, constant-current, and constant-voltage phases for portable media players and industrial handheld equipment.
For engineers reviewing the BQ24105RHLRG4 datasheet, BQ24105RHLRG4 pinout, BQ24105RHLRG4 application, or BQ24105RHLRG4 equivalent, key selection considerations include externally programmable 2.1–15.5-V output voltage range, high-side battery current sensing, thermal shutdown, automatic sleep mode, and compatibility with LiFePO₄ chemistry - all in a thermally enhanced 20-pin VQFN package.
Technical Context
The BQ24105RHLRG4 implements a synchronous buck topology with integrated P- and N-channel MOSFETs (RDS(on) = 400 mΩ / 130 mΩ at 7 V), enabling up to 2-A continuous charge current. Its 1.1-MHz switching frequency supports compact external components while maintaining >90% efficiency across 4.35–16-V input range.
Charge management uses three-phase sequencing: precharge (15–200 mA, set by ISET2), fast charge (150–2000 mA, set by ISET1), and constant-voltage regulation (±0.5% accuracy). Termination is triggered when charge current falls below user-programmable threshold (15–200 mA), backed by a programmable safety timer (25–572 min).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Charge Current | 2 A - supports rapid charging of single- to three-cell Li-ion, Li-polymer, or LiFePO₄ packs |
| Output Voltage Range | 2.1–15.5 V - externally programmable via FB pin, enabling flexible battery chemistries including LiFePO₄ |
| Voltage Regulation Accuracy | ±0.5% - ensures precise cell voltage control during CV phase, critical for cycle life and safety |
| Switching Frequency | 1.1 MHz - allows use of small 1–4.7-μH inductors and low-ESR ceramic output capacitors (4.7–47 μF) |
| Input Voltage Range | 4.35–16 V - compatible with 5-V USB adapters, 9-V wall adapters, and 12-V industrial supplies |
| Thermal Protection | Junction shutdown at 125°C - prevents thermal runaway during high-power operation or poor PCB heatsinking |
| Quiescent Current (Sleep) | 315 μA - minimizes standby drain on battery when CE is high or VCC drops below sleep threshold |
Pinout & Package
Package: 20-pin VQFN (3.50 mm × 4.50 mm), exposed thermal pad connected to VSS - requires PCB thermal vias for reliable 2-A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 3,4) | Power input | Accepts 4.35–16-V adapter supply; dual pins reduce trace resistance and improve thermal path |
| OUT (Pin 20) | Switch-node output | Drives external inductor; connects to zener TVS for MOSFET overvoltage clamping |
| SNS (Pin 15) | Current-sense input | Monitors voltage drop across external sense resistor (RSNS) for CC regulation and termination |
| BAT (Pin 14) | Battery voltage sense | High-impedance feedback node; bypassed with 0.1-μF capacitor to PGND for noise immunity |
| ISET1 (Pin 8) | Fast-charge current set | Resistor-to-ground sets 150–2000 mA fast-charge current (K = 1000 V/A) |
| ISET2 (Pin 9) | Precharge/termination current set | Resistor-to-ground programs 15–200 mA precharge and termination thresholds (K = 1000 V/A) |
| TTC (Pin 7) | Timer capacitor input | Connects to ground via 0.01–0.22-μF capacitor to set 25–572-min safety charge timer |
| STAT1/STAT2 (Pins 2,19) | Status outputs | Open-drain indicators for charge-in-progress (STAT1) and charge-complete (STAT2) |
| PG (Pin 5) | Power-good indicator | Asserts when valid VCC is present; used for system power sequencing or LED signaling |
| CE (Pin 16) | Charger enable | Active-low control: high state forces device into 315-μA sleep mode |
| TS (Pin 12) | Temperature sense input | Monitors NTC thermistor divider powered by VTSB; enables hot/cold cutoff (73.5%/34.4% VTSB thresholds) |
| VTSB (Pin 11) | TS bias regulator | 3.15-V output (±10%) powers external thermistor network; requires 0.1–1-μF decoupling |
| PGND (Pins 17,18) | Power ground return | Dual pins minimize ground loop inductance for high di/dt switching currents |
| VSS (Pin 10) | Analog ground | Reference for internal comparators and regulators; must be star-connected to PGND via thermal pad |
| VCC (Pin 6) | Analog supply input | Requires 0.1-μF capacitor to VSS; powers internal circuitry and enables operation above 4.35 V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous FETs | Eliminates need for external high-side/low-side MOSFETs and gate drivers, reducing BOM count and layout area |
| LiFePO₄ support | Programmable 2.1–15.5-V output enables safe charging of 3.2-V nominal LiFePO₄ cells (e.g., 6.4 V or 9.6 V packs) |
| High-side current sensing | Enables accurate battery current measurement without disrupting ground reference - critical for fuel gauging integration |
| Automatic recharge threshold | Triggers new charge cycle when battery voltage drops 75–125 mV/cell below regulation voltage, extending runtime in intermittent-use devices |
| Reverse leakage protection | Prevents battery discharge through IN pins when adapter is disconnected, preserving charge during storage |
Applications
| Portable Media Players | Industrial Handheld Scanners |
|---|---|
Use Scenario: Rechargeable Li-ion battery pack in MP3/Bluetooth audio players requiring compact, efficient charging under variable USB power sources. IC Role / Device Role / Timing Role: Primary charge controller managing CC/CV profile, status signaling via STAT1/STAT2, and thermal monitoring via TS/VTSB. Use Value: 1.1-MHz switching enables <4.7-μH inductor and 10-μF ceramic output capacitor, reducing solution size by >30% vs. 500-kHz alternatives. | Use Scenario: Ruggedized barcode scanner with removable Li-ion battery, operating in warehouses with wide ambient temperature ranges (–20°C to 60°C). IC Role / Device Role / Timing Role: System-controlled charger enforcing temperature cutoff (73.5%/34.4% VTSB thresholds) and automatic sleep during idle periods. Use Value: ±0.5% voltage regulation accuracy maintains cell health over 500+ cycles; 315-μA sleep current extends shelf life to >12 months. |
| Medical Point-of-Care Devices | LiFePO₄-Powered Portable Tools |
Use Scenario: Battery-backed vital sign monitor requiring fail-safe charging with thermal fault detection and automatic restart after voltage sag. IC Role / Device Role / Timing Role: Stand-alone charger executing full three-phase algorithm (precharge → CC → CV), using TTC for timer backup and BAT for voltage re-detection. Use Value: Built-in battery detection and 200-ms deglitch on TS/STAT inputs prevent false fault triggers in EMI-heavy clinical environments. | Use Scenario: Cordless drill using 2-cell (6.4 V) LiFePO₄ pack, needing field-replaceable batteries and robust overvoltage protection. IC Role / Device Role / Timing Role: Programmable voltage regulator (set via FB resistive divider) delivering precise 6.4 V to match LiFePO₄ chemistry, with 20-V absolute max rating on IN/OUT pins. Use Value: 20-V max rating withstands 12-V adapter transients; reverse leakage protection prevents pack self-discharge when tool is stored for weeks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge-management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24103ARHLR | Fixed 4.2 V or 8.4 V output (CELLS pin selectable); no FB pin; lacks LiFePO₄ programmability | Restricted to standard Li-ion/Li-polymer; no support for 3.2-V/cell chemistries | Select when cost-sensitive designs require fixed-output voltage and omit thermistor-based temperature monitoring |
| BQ24115RHLR | System-controlled version (requires host MCU commands); identical programmable voltage range and LiFePO₄ support | Requires firmware integration for charge enable/control; adds flexibility for adaptive charging profiles | Select when host processor must dynamically adjust charge parameters or enforce custom safety policies |
Compared with BQ24103ARHLR, the BQ24105RHLRG4 provides chemistry flexibility and autonomous operation; versus BQ24115RHLR, it offers simpler stand-alone implementation without MCU dependency - making it optimal for resource-constrained embedded systems needing LiFePO₄ compatibility.
Availability
BQ24105RHLRG4 is available at Aetrix Electronics and suitable for portable media players, industrial handheld scanners, medical point-of-care devices, LiFePO₄-powered portable tools, and ruggedized data loggers requiring stable component supply and long-term lifecycle support.
Supply support for BQ24105RHLRG4 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 solutions for industrial, automotive, and personal electronics markets.
The bqSWITCHER™ product line - including the BQ24105RHLRG4 - was designed specifically for highly efficient, integrated switch-mode battery charging in space-constrained portable applications, combining power FETs, PWM control, and safety features in a single VQFN package.
FAQ
What battery chemistries does the BQ24105RHLRG4 support?
The BQ24105RHLRG4 supports Li-ion, Li-polymer, and LiFePO₄ battery chemistries. Its externally programmable output voltage range (2.1–15.5 V via FB pin) enables precise matching to LiFePO₄ cell voltages (e.g., 3.2 V/cell), unlike fixed-output variants such as BQ24103A. The BQ24105RHLRG4 datasheet explicitly confirms LiFePO₄ compatibility in its Features and Applications sections.
How is charge current programmed on the BQ24105RHLRG4?
Charge current on the BQ24105RHLRG4 is set using two independent resistor-to-ground networks: ISET1 (Pin 8) configures fast-charge current (150–2000 mA, K = 1000 V/A), and ISET2 (Pin 9) sets precharge and termination current (15–200 mA, same gain). The BQ24105RHLRG4 uses high-side current sensing via the SNS pin and an external sense resistor (RSNS) to regulate these values with ±10% accuracy, excluding resistor tolerance effects.
Does the BQ24105RHLRG4 require external MOSFETs?
No, the BQ24105RHLRG4 integrates synchronous P-channel and N-channel power FETs - eliminating the need for external MOSFETs, gate drivers, or associated discrete components. Its internal FETs deliver up to 2-A continuous charge current with RDS(on) of 400 mΩ (P-FET) and 130 mΩ (N-FET) at 7 V, as specified in the BQ24105RHLRG4 Electrical Characteristics table.
What is the purpose of the TTC pin on the BQ24105RHLRG4?
On the BQ24105RHLRG4, the TTC (Timer and Termination Control) pin accepts an external capacitor (0.01–0.22 μF) to program a safety backup charge timer ranging from 25 to 572 minutes. When enabled, this timer forces charge termination if the primary current-based termination condition is not met - preventing overcharge in fault conditions. The BQ24105RHLRG4 datasheet specifies KTTC = 2.6 min/nF for timing calculation.
How does the BQ24105RHLRG4 handle thermal protection?
The BQ24105RHLRG4 implements dual-layer thermal protection: junction-level shutdown at 125°C (absolute maximum) and programmable temperature monitoring via the TS pin. The TS input compares against VTSB-derived thresholds (73.5% for cold, 34.4% for hot), with 20–40 ms deglitching to reject noise. This behavior is documented in the BQ24105RHLRG4 Electrical Characteristics table under "TEMPERATURE COMPARATOR" parameters.
BQ24105RHLRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- bqSWITCHER™
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1 ~ 3
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current, Timer
- Fault Protection:
- Over Temperature, Over Voltage
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 15.5V
- Voltage - Supply (Max):
- 16V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (3.5x4.5)
BQ24105RHLRG4 FAQ
1.How can I place an order for BQ24105RHLRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24105RHLRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BQ24105RHLRG4 reliable?
The price and inventory of BQ24105RHLRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24105RHLRG4 is usually 5 days.
3.What payment methods are accepted for BQ24105RHLRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24105RHLRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24105RHLRG4?
BQ24105RHLRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24105RHLRG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BQ24105RHLRG4?
For technical support, including BQ24105RHLRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24105RHLRG4 requirements.
6.How does Aetrix verify that BQ24105RHLRG4 is sourced from the original manufacturer or authorized distributors?
All BQ24105RHLRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ24105RHLRG4 meets industry standards.
7.What is the process for return or replacement of BQ24105RHLRG4?
All BQ24105RHLRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ24105RHLRG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BQ24105RHLRG4 part is unused and in its original packaging.
Return procedure for BQ24105RHLRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ24105RHLRG4 Tags
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BQ21040DBVR
Texas Instruments
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MCP73812T-420I/OT
Microchip Technology
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MCP73831T-2ACI/OT
Microchip Technology
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Microchip Technology
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MCP73831T-2DCI/OT
Microchip Technology
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MCP73832T-2DCI/OT
Microchip Technology
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MCP73831T-2ATI/OT
Microchip Technology
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MCP73832T-2ATI/OT
Microchip Technology
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MCP73831T-5ACI/OT
Microchip Technology
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MCP73832T-2ACI/MC
Microchip Technology
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MCP73831T-2ACI/MC
Microchip Technology
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MCP73831T-2ATI/MC
Microchip Technology
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