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Texas Instruments BQ2057TSN
- Part No.:
- BQ2057TSN
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2057TSN.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,789
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Product details
Overview
BQ2057TSN from Texas Instruments is an advanced linear lithium-ion/lithium-polymer charge management IC for dual-cell (8.2 V) battery packs. It integrates voltage regulation (±1% accuracy), current regulation (125 mV threshold), AutoComp™ dynamic impedance compensation, temperature-monitored charging, and automatic recharge. It drives external PNP or P-channel MOSFET pass devices in portable medical equipment and telematics control units.
For engineers reviewing the BQ2057TSN datasheet, BQ2057TSN pinout, BQ2057TSN application, or BQ2057TSN equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The BQ2057TSN implements a three-phase linear charge algorithm-conditioning (10% of regulation current), constant-current, and constant-voltage-with integrated precharge threshold (6.1 V) and recharge threshold (VO(REG) − 200 mV). It supports both high-side and low-side current sensing via the SNS pin and uses the TS pin to monitor battery temperature using V(TS1) = 30% VCC and V(TS2) = 60% VCC thresholds.
Its CC pin delivers a source-follower output to drive external pass transistors, while the STAT pin provides three-state status indication (high = charging, low = done, high-impedance = fault/sleep). The COMP pin enables AutoComp™ gain (2.2 V/V typical) to dynamically adjust regulation voltage based on charge current and internal pack impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Regulation Voltage | 8.2 V ±1% - precisely regulates dual-cell Li-ion/Li-pol packs without external feedback resistors. |
| Current Regulation Threshold | 125 mV (typical, high-side) - sets full-charge current via external sense resistor; enables 1 A charge with 0.125 Ω resistor. |
| Precharge Threshold | 6.1 V (min 5.9 V, max 6.22 V) - initiates safe low-current conditioning for deeply discharged dual-cell batteries. |
| Charge Termination Current | −14 mV (typical, relative to VCC or VSS) - detects taper-down to end CV phase and prevent overcharge. |
| AutoComp™ Gain | 2.2 V/V (typical) - scales voltage regulation offset proportionally to sensed current, reducing charge time by compensating for IR drop. |
| VCC Operating Range | 4.5 V to 15 V - supports wide-input wall adapters and USB-powered systems without LDO pre-regulation. |
| Operating Temperature | −20°C to +70°C - qualified for industrial and automotive-adjacent portable electronics environments. |
Pinout & Package
Package: 8-pin TSSOP (TS), body size 3.00 mm × 4.40 mm, exposed pad optional per TI SLUS025G.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SNS | Current sense input | Accepts voltage drop across external sense resistor; supports high- or low-side placement without added components. |
| BAT | Battery voltage sense input | Direct connection to battery positive terminal; enables accurate regulation independent of PCB trace resistance. |
| COMP | AutoComp™ compensation input | Adjusts regulation voltage dynamically during charge to offset battery internal impedance effects. |
| CC | Charge control output | Source-follower driver for external PNP or P-channel MOSFET; sinks up to 40 mA. |
| VSS | Ground reference | Common return for current sense, temperature sense, and STAT output; must be low-impedance. |
| STAT | Charge status output | Three-state signal: high = charging, low = done, high-Z = temperature fault or sleep mode. |
| VCC | Supply voltage input | Power source and current reference for high-side sensing; also powers internal regulators and comparators. |
| TS | Temperature sense input | Monitors external thermistor divider; disables charge if voltage falls outside 30%–60% VCC window. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated battery conditioning | Applies ~10% regulation current below 6.1 V to safely revive deeply discharged dual-cell packs while limiting pass-device heating. |
| AutoComp™ dynamic compensation | Reduces total charge time by adjusting regulation voltage in real time to counteract battery IR drop during high-current phases. |
| Programmable charge termination | Stops charging when sensed current drops to −14 mV at SNS pin, preventing overcharge and extending cycle life. |
| Low-dropout architecture | 0.3-V dropout minimizes power loss and thermal stress in external pass transistor under worst-case input-to-battery delta. |
| Three-state STAT output | Enables direct LED drive (single or dual-color) or host processor interface without external logic or pull-up resistors. |
Applications
| Emergency Call Systems | Telematics Control Unit |
|---|---|
Use Scenario: Compact, battery-backed emergency voice/data transmission module requiring reliable dual-cell Li-ion charging in vehicle cabins. IC Role / Device Role / Timing Role: Primary linear charge controller managing full three-phase charging, temperature safety lockout, and automatic recharge after load discharge. Use Value: Ensures >99% state-of-charge retention between activations and prevents thermal runaway during cabin temperature extremes (−20°C to +70°C). | Use Scenario: In-vehicle data logger and GPS tracker powered by dual-cell Li-ion, operating intermittently with long standby periods. IC Role / Device Role / Timing Role: Dual-cell charge manager with sleep mode activation when VCC is removed, preserving battery capacity during ignition-off intervals. Use Value: Achieves <6 µA sleep current (BQ2057T variant), extending quiescent battery life to >12 months without maintenance. |
| Portable Medical Equipment | EPOS Card Reader |
Use Scenario: Handheld diagnostic device with replaceable dual-cell Li-ion battery, requiring certified-safe charging under clinical environmental constraints. IC Role / Device Role / Timing Role: Safety-critical charge supervisor enforcing strict temperature window (30–60% VCC) and voltage thresholds before/after charge initiation. Use Value: Meets IEC 62368-1 thermal compliance via hardware-enforced TS-based inhibit, eliminating software dependency for fail-safe operation. | Use Scenario: Battery-powered point-of-sale terminal used in retail environments with frequent plug-in recharging and intermittent usage. IC Role / Device Role / Timing Role: Cost-optimized dual-cell charger supporting automatic recharge when battery voltage drops below VO(REG) − 200 mV after system load cycles. Use Value: Eliminates manual re-initiation of charge; maintains >85% usable capacity across 500+ charge/discharge cycles with minimal user intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-cell Li-ion linear charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2057WTS | 8.4 V fixed regulation voltage (vs. BQ2057TSN's 8.2 V); otherwise identical pinout, package, and feature set. | Targets higher-capacity dual-cell Li-ion packs requiring 8.4 V termination; not interchangeable without battery chemistry verification. | Select BQ2057WTS only when battery specification mandates 8.4 V per 2S configuration. |
| TP4056 | Single-cell only (4.2 V), no temperature monitoring, no AutoComp™, no programmable termination, SO-8 package only. | Limited to cost-sensitive consumer accessories; lacks safety features required for medical or automotive-qualified designs. | Use TP4056 only in non-safety-critical, single-cell applications where BQ2057TSN's dual-cell support and thermal protection are unnecessary. |
Compared with BQ2057WTS, BQ2057TSN provides tighter voltage matching for standard 8.2 V dual-cell Li-ion packs; compared with TP4056, it adds essential dual-cell regulation, hardware temperature enforcement, and dynamic impedance compensation-critical for reliability in telematics and medical use cases.
Availability
BQ2057TSN is available at Aetrix Electronics and suitable for portable medical equipment, telematics control units, emergency call systems, and EPOS card readers requiring stable component supply across extended production lifecycles.
Supply support for BQ2057TSN 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 dual-cell Li-ion/Li-pol applications where safety, accuracy, and minimal external component count are critical.
FAQ
What is the exact charge regulation voltage of the BQ2057TSN?
The BQ2057TSN has a fixed charge regulation voltage of 8.2 V, with a tolerance of ±1% over temperature and supply voltage ranges. This value is factory-trimmed and does not require external resistive feedback. The BQ2057TSN is specifically designated for dual-cell Li-ion or Li-polymer battery packs requiring precise 8.2 V termination, as confirmed in TI's SLUS025G datasheet Section 8.5.
Does the BQ2057TSN support both high-side and low-side current sensing?
Yes, the BQ2057TSN supports both configurations without additional components. The SNS pin accepts the voltage drop across an external sense resistor placed either between VCC and SNS (high-side) or between VSS and SNS (low-side). The datasheet specifies distinct V(SNS) thresholds for each mode-103.6–137.5 mV for high-side and 108.1–143 mV for low-side-ensuring accurate current regulation in either topology.
How does the AutoComp™ feature function in the BQ2057TSN?
The AutoComp™ feature in the BQ2057TSN applies a gain of 2.2 V/V (typical) to the COMP pin input, allowing dynamic adjustment of the voltage regulation setpoint based on real-time charge current. This compensates for voltage drop across the battery's internal impedance, reducing total charge time while maintaining safety. It is enabled by connecting a resistor network to COMP and is fully characterized in TI's SLUS025G Section 8.5 and Figure 9-2.
What is the purpose of the TS pin on the BQ2057TSN?
The TS pin on the BQ2057TSN monitors battery temperature via an external thermistor divider. It compares the applied voltage against internal thresholds of 30% VCC (V(TS1)) and 60% VCC (V(TS2)). If the voltage falls outside this window, charging is suspended and STAT goes high-impedance. This hardware-level safety function operates independently of VCC fluctuations and is mandatory for IEC 62368-1 compliance in portable medical and automotive applications.
Can the BQ2057TSN automatically restart charging after battery voltage drops post-termination?
Yes, the BQ2057TSN implements automatic recharge: when the battery voltage falls below V(RCH) = VO(REG) − 200 mV (i.e., 8.2 V − 0.2 V = 8.0 V), the device reinitiates the full three-phase charge cycle. This behavior is inherent to the BQ2057TSN's design and requires no external circuitry or host intervention, ensuring consistent battery readiness in intermittently powered systems like EPOS terminals and telematics loggers.
BQ2057TSN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 4.1V
- Voltage - Supply (Max):
- 15V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
BQ2057TSN FAQ
1.How can I place an order for BQ2057TSN through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2057TSN 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 BQ2057TSN reliable?
The price and inventory of BQ2057TSN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2057TSN is usually 5 days.
3.What payment methods are accepted for BQ2057TSN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2057TSN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2057TSN?
BQ2057TSN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2057TSN 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 BQ2057TSN?
For technical support, including BQ2057TSN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2057TSN requirements.
6.How does Aetrix verify that BQ2057TSN is sourced from the original manufacturer or authorized distributors?
All BQ2057TSN 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 BQ2057TSN meets industry standards.
7.What is the process for return or replacement of BQ2057TSN?
All BQ2057TSN units undergo pre-shipment inspection (PSI). If there is an issue with BQ2057TSN, 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 BQ2057TSN part is unused and in its original packaging.
Return procedure for BQ2057TSN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2057TSN Tags
-
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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MCP73832T-2ACI/OT
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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