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Texas Instruments BQ2057CDGKR
- Part No.:
- BQ2057CDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
BQ2057CDGKR.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,694
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Product details
Overview
BQ2057CDGKR from Texas Instruments is a linear lithium-ion battery charge management IC for single-cell 4.2 V Li-ion/Li-pol packs. It integrates voltage regulation (±1% accuracy), current regulation (via external sense resistor), AutoComp™ dynamic impedance compensation, temperature-monitored charge qualification, and precharge conditioning. It drives external PNP or P-channel MOSFET pass devices in portable medical equipment and telematics control units.
For engineers reviewing the BQ2057CDGKR datasheet, BQ2057CDGKR pinout, BQ2057CDGKR application, or BQ2057CDGKR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated MSOP-8 pin functions, confirmed alternative parts with functional differences, and supply support for volume production in safety-critical embedded systems.
Technical Context
The BQ2057CDGKR implements a three-phase linear charging algorithm: preconditioning (10% of regulation current at ≤3.1 V), constant-current regulation (set by external sense resistor), and constant-voltage regulation (4.20 V ±1% over −20°C to 70°C). It uses high- or low-side current sensing without additional components and monitors battery temperature via an external thermistor divider referenced to VCC.
Its AutoComp™ feature dynamically adjusts voltage regulation based on sensed charge current to reduce total charge time while maintaining safe cell voltage limits. The STAT pin provides three-state status output (high = charging, low = done, high-impedance = fault/sleep), and the CC pin operates as a source-follower gate driver for external pass transistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Regulation Voltage | 4.20 V ±1% - precise termination threshold for single-cell Li-ion, minimizing overcharge risk and extending cycle life |
| Current Regulation Threshold | 105 mV (typ.) - sets full-charge current via external sense resistor; supports both high- and low-side configurations |
| Precharge Threshold | 3.10 V (typ.) - triggers safe low-current conditioning for deeply discharged cells before main charge phase |
| Charge Termination Current | −14 mV (typ.) - detects taper current at SNS pin to end CV phase and prevent thermal stress |
| AutoComp™ Gain | 2.2 V/V (typ.) - scales voltage regulation offset proportionally to charge current, reducing total charge time |
| Operating Temperature Range | −20°C to 70°C - validated performance envelope for industrial and automotive-adjacent portable electronics |
| VCC Supply Range | 4.5 V to 15 V - accommodates wide-input DC adapters and USB-powered designs without LDO overhead |
Pinout & Package
Package: 8-pin MSOP (DGK), 3.00 mm × 3.00 mm body size, exposed pad optional per TI design guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | Voltage sense input | Direct connection to battery positive terminal for accurate regulation feedback; high-impedance input minimizes loading |
| SNS | Current sense input | Accepts voltage drop across external sense resistor; supports placement on either high or low side of battery without extra circuitry |
| COMP | Charge-rate compensation input | Receives AutoComp™ feedback signal to dynamically adjust regulation voltage during charge |
| CC | Charge control output | Source-follower gate driver for external PNP or P-channel MOSFET; requires no level-shifting components |
| VCC | Supply voltage input | Power source and current reference for high-side sensing; enables operation up to 15 V input |
| TS | Temperature sense input | Monitors thermistor divider voltage; internal thresholds (30% and 60% of VCC) enable battery-temperature–based charge inhibit |
| STAT | Charge status output | Three-state open-drain output: high = charging, low = done, high-Z = fault or sleep mode |
| VSS | Ground | System ground reference for all analog and digital functions; must be low-impedance return path for sense current |
Key Features
| Feature | Design Value |
|---|---|
| Integrated battery conditioning | Applies ~10% of full charge current below 3.1 V to safely revive deeply discharged cells without excessive heat in the pass element |
| 0.3-V dropout voltage | Minimizes power dissipation in external pass transistor during constant-current phase, reducing thermal design burden |
| Programmable charge current | Set precisely via single external sense resistor; compatible with high- or low-side placement-no added components required |
| AutoComp™ dynamic compensation | Reduces total charge time by adjusting regulation voltage in real time based on measured charge current and pack impedance |
| Three-state STAT output | Enables direct LED indication (single or dual) or host processor interface using simple GPIO reads without external logic |
Applications
| Emergency Call Systems | Telematics Control Unit |
|---|---|
Use Scenario: Compact, battery-backed emergency voice/data transmission module requiring reliable charge control under variable ambient temperatures. IC Role / Device Role / Timing Role: Linear charge controller managing 4.2 V single-cell Li-ion pack with temperature-qualified start, precharge, and AutoComp™-optimized full charge. Use Value: Ensures guaranteed minimum runtime after deep discharge and prevents thermal runaway during vehicle cabin temperature extremes (−20°C to 70°C). | Use Scenario: In-vehicle data logger and GPS tracker powered by rechargeable Li-ion battery, operating continuously during ignition-off periods. IC Role / Device Role / Timing Role: Primary charge manager enabling automatic recharge from 12 V vehicle supply, with sleep mode activation when VCC drops below BAT voltage. Use Value: Eliminates parasitic battery drain during vehicle standby by entering ultra-low-power sleep (6 µA typical) when external power is removed. |
| Portable Medical Equipment | EPOS Card Reader |
Use Scenario: Handheld diagnostic device with regulatory-mandated battery safety monitoring and predictable charge completion timing. IC Role / Device Role / Timing Role: Safety-critical charge supervisor enforcing temperature window (VTS1/VTS2) compliance and terminating charge at precise ITERM threshold. Use Value: Meets IEC 62368-1 thermal hazard requirements through hardware-enforced charge inhibit outside 0°C–45°C equivalent thermistor voltage range. | Use Scenario: Battery-powered point-of-sale terminal used in retail environments with intermittent AC charging and frequent battery cycling. IC Role / Device Role / Timing Role: Cost-optimized linear charger delivering consistent 4.2 V regulation and automatic recharge when battery voltage falls to VO(REG)−100 mV. Use Value: Extends usable battery cycles by avoiding repeated shallow discharges-recharge only initiates after ≥100 mV voltage sag post-full-charge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear lithium-ion charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2057CTS | Same 4.2 V regulation, TSSOP-8 package (3.0 mm × 4.4 mm); different pinout vs. DGK; RθJA = 157.1°C/W vs. 121.9°C/W | Higher thermal resistance requires more PCB copper area for same power dissipation; suitable where board space allows larger footprint | Select BQ2057CTS only if layout constraints favor TSSOP and thermal margin permits higher junction temperature rise |
| MCP73831T-2DCI/OT | Single-cell 4.2 V linear charger; fixed 500 mA current; no AutoComp™; no temperature sense input; SOT-23-5 package | Lacks temperature qualification, programmable current, and dynamic compensation-intended for cost-sensitive, non-safety-critical consumer accessories | Choose MCP73831T-2DCI/OT only for ultra-low-cost, low-power (<500 mA), temperature-insensitive applications where BQ2057CDGKR features are unnecessary |
Compared with BQ2057CTS and MCP73831T-2DCI/OT, the BQ2057CDGKR uniquely combines MSOP-8 compactness, AutoComp™-enabled faster charging, and full thermistor-based safety qualification-making it the only option among the three qualified for portable medical and automotive-adjacent telematics use cases.
Availability
BQ2057CDGKR is available at Aetrix Electronics and suitable for portable medical equipment, telematics control units, and emergency call systems requiring stable component supply across extended product lifecycles.
Supply support for BQ2057CDGKR 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 company specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in precision analog ICs.
The BQ2057 series belongs to TI's battery management portfolio, designed specifically for cost-sensitive, compact linear charging in single- and dual-cell Li-ion/Li-pol applications where safety, accuracy, and minimal external components are critical.
FAQ
What is the exact charge regulation voltage of the BQ2057CDGKR?
The BQ2057CDGKR has a nominal charge regulation voltage of 4.20 V, with a tolerance of ±1% over the full operating temperature range (−20°C to 70°C) and supply voltage range (4.5 V to 15 V). This value is factory-trimmed and specified in the Electrical Characteristics table of the SLUS025G datasheet as 4.158 V (min), 4.20 V (typ), and 4.242 V (max).
Does the BQ2057CDGKR support both high-side and low-side current sensing?
Yes, the BQ2057CDGKR supports both high-side and low-side current sensing configurations without additional components. The SNS pin accepts the voltage drop across the external sense resistor placed either between VCC and SNS (high-side) or between VSS and SNS (low-side), with distinct regulation thresholds specified for each configuration in the datasheet.
What is the function of the COMP pin on the BQ2057CDGKR?
On the BQ2057CDGKR, the COMP pin is the AutoComp™ charge-rate compensation input. It accepts a feedback signal that dynamically adjusts the voltage regulation setpoint in proportion to charge current, reducing total charge time while maintaining safe cell voltage limits. Its gain is 2.2 V/V (typical), as confirmed in Section 8.5 of the SLUS025G datasheet.
How does the BQ2057CDGKR handle deeply discharged batteries?
The BQ2057CDGKR handles deeply discharged batteries by initiating a precharge (conditioning) phase when the BAT voltage falls below 3.10 V (typical). During this phase, it delivers approximately 10% of the programmed regulation current to safely raise the cell voltage before entering constant-current charging-minimizing heat dissipation in the external pass element.
What package type is used by the BQ2057CDGKR?
The BQ2057CDGKR uses the 8-pin MSOP (DGK) package with a 3.00 mm × 3.00 mm body size and thermal characteristics including RθJA = 121.9°C/W. This package is explicitly listed in the Device Comparison Table and Pin Configuration section of the SLUS025G datasheet for the BQ2057C variant.
BQ2057CDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 15V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
BQ2057CDGKR FAQ
1.How can I place an order for BQ2057CDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2057CDGKR 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 BQ2057CDGKR reliable?
The price and inventory of BQ2057CDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2057CDGKR is usually 5 days.
3.What payment methods are accepted for BQ2057CDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2057CDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2057CDGKR?
BQ2057CDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2057CDGKR 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 BQ2057CDGKR?
For technical support, including BQ2057CDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2057CDGKR requirements.
6.How does Aetrix verify that BQ2057CDGKR is sourced from the original manufacturer or authorized distributors?
All BQ2057CDGKR 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 BQ2057CDGKR meets industry standards.
7.What is the process for return or replacement of BQ2057CDGKR?
All BQ2057CDGKR units undergo pre-shipment inspection (PSI). If there is an issue with BQ2057CDGKR, 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 BQ2057CDGKR part is unused and in its original packaging.
Return procedure for BQ2057CDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2057CDGKR Tags
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BQ21040DBVR
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