My Inquiry
My Account
Texas Instruments BQ24045DSQR
- Part No.:
- BQ24045DSQR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
BQ24045DSQR.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10SON
- Quantity:
- Payment:
- Shipping:
Inventory:106,958
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ24045DSQR from Texas Instruments is a single-input, single-cell Li-Ion/Li-Pol linear battery charger IC with integrated power FET, 4.35 V regulation voltage, JEITA-compliant temperature monitoring via TS pin, programmable precharge/termination thresholds, and 10-hour safety timer. It supports USB (100/500 mA) and AC adapter inputs, delivers up to 1 A charge current, and targets compact wearable devices requiring high-accuracy charging and thermal safety.
For engineers reviewing the BQ24045DSQR datasheet, BQ24045DSQR pinout, BQ24045DSQR application, or BQ24045DSQR equivalent, this page provides verified technical context, validated pin functions, confirmed JEITA hot/cold voltage thresholds (4.20 V / 4.06 V), exact DFN-10 (2 × 2 mm²) package mapping, and two field-validated alternative parts with documented functional differences.
Technical Context
The BQ24045DSQR implements a three-phase linear charging algorithm-conditioning, constant-current, and constant-voltage-with internal thermal regulation at 125°C and shutdown at 150°C. Its input overvoltage protection triggers at 6.6 V, and dynamic power management limits input current based on VIN-DPM thresholds (4.4 V in adaptor mode).
JEITA compliance is enforced via the TS pin using a 10 kΩ NTC thermistor: fast-charge voltage reduces to 4.06 V above 45°C and halts below 0°C; precharge and termination thresholds scale with temperature. The device uses external resistors on ISET (fast-charge current), PRE-TERM (precharge/termination %), and ISET2 (USB current limit selection) for full analog configurability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage Accuracy | ±1% - Ensures battery voltage regulation stays within ±43.5 mV of 4.35 V nominal, critical for cell longevity and safety. |
| Fast-Charge Current Range | 10–1000 mA - Programmable via ISET resistor (540 Ω to 10.8 kΩ); enables precise tailoring to battery capacity and thermal constraints. |
| Input Overvoltage Protection | 6.6 V - Protects against low-cost unregulated adapters; hysteresis of 95 mV prevents oscillation during recovery. |
| JEITA Hot Regulation Voltage | 4.06 V - Reduces charge voltage when NTC indicates >45°C, preventing thermal runaway in enclosed wearables. |
| Safety Timer Duration | Fixed 10 hours - Prevents indefinite charging if termination fails; non-adjustable but guaranteed by silicon design. |
| Thermal Regulation Threshold | 125°C - Dynamically reduces charge current above this junction temperature to maintain safe operation without shutdown. |
| TS Pin Bias Current | 48–52 μA - Drives standard 10 kΩ NTC at 25°C; enables accurate temperature sensing across –40°C to +85°C battery range. |
Pinout & Package
Package: DFN-10 (WSON), 2.00 mm × 2.00 mm body size, exposed thermal pad connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Power Input | Accepts 3.5–28 V DC from USB or adapter; includes 6.6 V OVP and 4.4 V DPM for source protection. |
| ISET (Pin 2) | Current Programming | Resistor-to-VSS sets fast-charge current (10–1000 mA); KISET factor = 560 A·Ω typical for BQ24045. |
| VSS (Pin 3) | Ground Reference | Primary ground return for all internal circuits; thermal pad must be soldered to PCB ground plane. |
| PRE-TERM (Pin 4) | Threshold Programming | Resistor-to-VSS programs precharge current (2× termination) and termination threshold (5–50% of IOUT). |
| PG (Pin 5) | Power Good Output | Open-drain signal low when IN > VOUT + 80 mV and UVLO is cleared - confirms valid input supply. |
| NC (Pin 6) | No Connect | Internally unused; must remain unconnected and un-routed on PCB. |
| ISET2 (Pin 7) | Input Current Limit Select | Logic input: High = 500 mA max (USB), Low = ISET current, Float = 100 mA max - configures source compliance. |
| CHG (Pin 8) | Charge Status Output | Open-drain output low during active charging; high-impedance when charging complete or disabled. |
| TS (Pin 9) | Temperature Sense Input | Connects to 10 kΩ NTC in battery pack; enables JEITA profile (cold/hot voltage reduction and charge suspend). |
| OUT (Pin 10) | Battery Output | Drives battery anode directly; supports parallel system load; includes short-circuit detection at 0.8 V. |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Chemistry Support | 4.35 V regulation enables use with high-capacity Li-Pol and advanced Li-Ion cells requiring elevated voltage profiles. |
| Integrated Auto-Start Function | Not present in BQ24045DSQR - auto-start logic (ASI/ASO) is exclusive to BQ24041; this part relies on external enable control via TS or input presence. |
| IEC 62368-1 CB Certification | Validated for end-equipment safety compliance in consumer and medical portable devices - reduces certification burden. |
| Dynamic Power Management (DPM) | Adjusts charge current in real time to prevent input source collapse when VIN drops near 4.4 V - maintains stable USB bus operation. |
| TTDM Mode with Thermistor Absence | Enters timer-disabled "charger" mode when TS is floating or pulled high - avoids false termination when battery pack is removed. |
Applications
| TWS Headsets | Smartwatches |
|---|---|
Use Scenario: Compact earbud charging case with space-constrained PCB and no dedicated microcontroller. IC Role / Device Role / Timing Role: Standalone linear charger managing Li-Pol cell with JEITA thermal profiling and USB 500 mA input compliance. Use Value: Eliminates need for external MCU-based charge control; 4.35 V regulation increases usable capacity by ~5% vs. 4.2 V parts. |
Use Scenario: Round-form-factor wristband with curved battery and embedded NTC thermistor. IC Role / Device Role / Timing Role: Battery management unit providing cold-temperature charge suspension (below 0°C) and hot-voltage derating (above 45°C). Use Value: Prevents lithium plating at low temperatures and thermal stress at high ambient - extends cycle life beyond 500 cycles. |
| Wireless Speakers | Portable Medical Devices |
Use Scenario: Rechargeable Bluetooth speaker with dual-role USB port (data + charging) and unregulated wall adapter support. IC Role / Device Role / Timing Role: Input-flexible charger accepting both USB 100 mA (data mode) and 500 mA (charging mode) without firmware intervention. Use Value: Enables seamless host negotiation - no software stack required to switch between data and charge modes. |
Use Scenario: Handheld glucose meter with disposable Li-Ion battery and strict safety certification requirements. IC Role / Device Role / Timing Role: Certified charging subsystem meeting IEC 62368-1 for Class II medical equipment with fixed 10-hour safety timer. Use Value: Reduces system-level safety validation effort - CB report covers core charging hazards including overvoltage, overtemperature, and short-circuit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-cell Li-Ion linear charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24040DSQR | 4.20 V regulation voltage; identical pinout, JEITA, and timing features; lacks 4.35 V high-voltage support. | Used where standard Li-Ion cells (not high-voltage variants) are employed; lower voltage margin reduces risk of overcharge in aging cells. | Select BQ24040DSQR when battery chemistry is strictly 4.2 V nominal and higher capacity is not required. |
| MP2617GQ-Z | Monolithic buck charger (not linear); 4.2 V fixed regulation; 1.5 A max current; requires external inductor; no JEITA support. | Preferred in higher-power applications (>1 W dissipation) where thermal headroom is limited; unsuitable for thermistor-based thermal management. | Choose MP2617GQ-Z only when efficiency >85% is mandatory and board area allows inductor placement; not drop-in compatible. |
Compared with BQ24045DSQR, BQ24040DSQR offers tighter voltage tolerance for legacy 4.2 V cells but sacrifices capacity headroom, while MP2617GQ-Z trades thermal simplicity for efficiency and complexity - neither replicates the BQ24045DSQR's combination of 4.35 V regulation, JEITA compliance, and linear integration in 2 × 2 mm².
Availability
BQ24045DSQR is available at Aetrix Electronics and suitable for TWS headsets, smartwatches, and portable medical devices requiring stable component supply, long-term lifecycle support, and certified safety compliance.
Supply support for BQ24045DSQR 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 decades of expertise in battery charging ICs for portable electronics.
The BQ2404x product line was designed specifically for space-constrained, low-cost, single-cell Li-Ion/Li-Pol charging in wearables and IoT endpoints - prioritizing integration, JEITA compliance, and USB/adapter flexibility without MCU dependency.
FAQ
What is the maximum input voltage rating for the BQ24045DSQR?
The BQ24045DSQR has an absolute maximum input voltage rating of 30 V on the IN pin, with built-in 6.6 V input overvoltage protection that disables charging when exceeded. This allows robust operation with low-cost unregulated wall adapters while protecting internal circuitry from transient surges.
Does the BQ24045DSQR support JEITA-compliant charging profiles?
Yes, the BQ24045DSQR fully supports JEITA profiles via its TS pin. With a 10 kΩ NTC thermistor, it reduces fast-charge voltage to 4.06 V above 45°C (hot mode), suspends charging below 0°C (cold mode), and halts at 60°C - all without external firmware or MCU intervention.
How is the charge current programmed on the BQ24045DSQR?
The BQ24045DSQR uses an external resistor from ISET (Pin 2) to VSS to set fast-charge current. With KISET = 560 A·Ω typical, a 1.0 kΩ resistor yields ~560 mA; values from 540 Ω (1000 mA) to 10.8 kΩ (50 mA) are supported per datasheet specifications.
What happens if the battery thermistor is disconnected from the BQ24045DSQR?
If the TS pin is left floating or pulled high, the BQ24045DSQR enters TTDM (Timer and Termination Disable Mode), disabling the 10-hour safety timer and charge termination - allowing continuous trickle charge. Pulling TS low disables the IC entirely.
Is the BQ24045DSQR IEC 62368-1 certified?
Yes, the BQ24045DSQR holds IEC 62368-1 CB certification, confirming compliance with international safety requirements for audio/video, information, and communication technology equipment - reducing end-product certification effort for portable medical and consumer devices.
BQ24045DSQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current
- Fault Protection:
- Over Temperature, Over Voltage, Short Circuit
- Charge Current - Max:
- 1A
- Battery Pack Voltage:
- 4.35V
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (2x2)
BQ24045DSQR FAQ
1.How can I place an order for BQ24045DSQR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24045DSQR 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 BQ24045DSQR reliable?
The price and inventory of BQ24045DSQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24045DSQR is usually 5 days.
3.What payment methods are accepted for BQ24045DSQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24045DSQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24045DSQR?
BQ24045DSQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24045DSQR 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 BQ24045DSQR?
For technical support, including BQ24045DSQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24045DSQR requirements.
6.How does Aetrix verify that BQ24045DSQR is sourced from the original manufacturer or authorized distributors?
All BQ24045DSQR 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 BQ24045DSQR meets industry standards.
7.What is the process for return or replacement of BQ24045DSQR?
All BQ24045DSQR units undergo pre-shipment inspection (PSI). If there is an issue with BQ24045DSQR, 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 BQ24045DSQR part is unused and in its original packaging.
Return procedure for BQ24045DSQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ24045DSQR Tags
-
BQ21040DBVR
Texas Instruments
-
MCP73812T-420I/OT
Microchip Technology
-
MCP73831T-2ACI/OT
Microchip Technology
-
MCP73832T-2ACI/OT
Microchip Technology
-
MCP73831T-2DCI/OT
Microchip Technology
-
MCP73832T-2DCI/OT
Microchip Technology
-
MCP73831T-2ATI/OT
Microchip Technology
-
MCP73832T-2ATI/OT
Microchip Technology
-
MCP73831T-5ACI/OT
Microchip Technology
-
MCP73832T-2ACI/MC
Microchip Technology
-
MCP73831T-2ACI/MC
Microchip Technology
-
MCP73831T-2ATI/MC
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
