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Texas Instruments BQ2057SNTR
- Part No.:
- BQ2057SNTR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- -
- Datasheet:
-
BQ2057SNTR.pdf
- Description:
- IC SUPERVISOR PWR SUP SUPPORT
- Quantity:
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Inventory:2,500
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Product details
Overview
BQ2057SNTR from Texas Instruments is a fixed 4.2 V linear lithium-ion battery charge-management IC in 8-pin SOIC package, integrating voltage regulation (±1% accuracy), current regulation (105 mV typical SNS threshold), AutoComp dynamic impedance compensation, and temperature-monitored three-phase charging (preconditioning, constant-current, constant-voltage) for single-cell Li-Ion/Li-Pol packs in portable electronics.
For engineers reviewing the BQ2057SNTR datasheet, BQ2057SNTR pinout, BQ2057SNTR application, or BQ2057SNTR equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative options with functional distinctions, and supply-chain support details specific to BQ2057SNTR's role in compact, cost-sensitive battery-powered systems.
Technical Context
The BQ2057SNTR implements a linear charge controller architecture with integrated voltage and current regulation loops, using BAT pin for direct battery voltage feedback and SNS pin for high- or low-side current sensing via external resistor. It executes automatic three-stage charging-battery conditioning at ~10% of regulation current, constant-current phase until regulation voltage is reached, then constant-voltage phase with termination at I(TERM) = −14 mV (relative to VCC or VSS).
Temperature safety is enforced via TS pin monitoring against V(TS1) = 30% VCC (lower threshold) and V(TS2) = 60% VCC (upper threshold); AutoComp gain G(COMP) = 2.2 V/V dynamically adjusts regulation voltage based on sensed current to offset pack impedance; STAT pin provides 3-state status (High = charging, Low = done, Hi-Z = fault/sleep).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Regulation Voltage | 4.20 V ±0.042 V - precisely regulates single-cell Li-Ion to full capacity without overvoltage risk |
| Current Regulation Threshold | 105 mV (typ) at SNS - sets charge current via external sense resistor (e.g., 0.1 Ω → 1.05 A) |
| Voltage Regulation Accuracy | Better than ±1% over −20°C to 70°C - ensures consistent cell stress and cycle life across operating range |
| AutoComp Gain | 2.2 V/V - scales sensed current to compensate for up to ~100 mΩ pack impedance, reducing charge time safely |
| Precharge Threshold | 3.10 V (typ) - initiates low-current conditioning for deeply discharged cells, minimizing pass-element heat |
| Charge Termination Current | −14 mV (typ) at SNS - detects taper-down to ~10% of regulation current, preventing overcharge |
| Operating Temperature Range | −20°C to 70°C - supports industrial-grade portable equipment deployment |
Pinout & Package
Package: 8-pin SOIC (SN), body size 3.91 mm × 4.90 mm, standard JEDEC MS-012AC, lead pitch 1.27 mm, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SNS | Current sense input | Accepts voltage drop across external sense resistor (high- or low-side placement); determines regulation current |
| BAT | Battery voltage sense input | Direct connection to battery positive; enables precise closed-loop voltage regulation at cell terminals |
| COMP | AutoComp compensation input | Receives scaled current-sense signal to dynamically raise regulation voltage and offset pack IR drop |
| CC | Charge control output | Source-follower drive for external PNP or P-channel MOSFET pass element; regulates current/voltage |
| STAT | Charge status output | 3-state open-drain: High = charging, Low = done, Hi-Z = temp fault or sleep mode |
| TS | Temperature sense input | Monitors thermistor divider voltage; inhibits charge outside 30%–60% VCC range (≈0°C–60°C typical) |
| VCC | Supply voltage input | 4.5 V to 15 V input; powers IC and serves as reference for high-side current sensing |
| VSS | Ground | System ground reference for all analog and digital functions; return path for sense resistor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated three-phase charging | Automatically sequences preconditioning (10% current), constant-current, and constant-voltage phases without external logic |
| Programmable charge current | Set via single external sense resistor; supports high- or low-side configuration without added components |
| AutoComp dynamic compensation | Reduces average charge time by counteracting voltage drop across pack internal resistance during CC/CV phases |
| Cell-temperature monitoring | Hardware-enforced thermal safety window (V(TS1)/V(TS2)) disables charge outside defined thresholds |
| Automatic recharge | Resumes charging when battery voltage falls below VO(REG) − 100 mV, maintaining full state-of-charge |
Applications
| Smartphone Battery Charging | Wireless Headset Power Management |
|---|---|
Use Scenario: Single-cell Li-Ion charging in space-constrained handheld devices with thermal constraints. IC Role / Device Role / Timing Role: Linear charge controller managing full charge cycle including precharge, CC, CV, termination, and auto-recharge. Use Value: ±1% voltage accuracy prevents cell overvoltage degradation; 0.3 V dropout minimizes heat in sealed enclosures. | Use Scenario: Rechargeable earbud case with dual independent charging paths and temperature-aware operation. IC Role / Device Role / Timing Role: Primary charge management IC per battery, coordinating with host MCU via STAT pin interface. Use Value: 3-state STAT output enables simple LED or GPIO-based status reporting; low sleep current (<6 µA) preserves case battery during storage. |
| Portable Medical Monitor | Industrial Handheld Scanner |
Use Scenario: Battery-backed clinical device requiring reliable, certified charge control under variable ambient temperatures. IC Role / Device Role / Timing Role: Safety-critical linear charger enforcing strict thermal and voltage limits per IEC 62368-1 requirements. Use Value: Hardware-based TS pin thresholds eliminate firmware dependency for thermal cutoff; ±1% regulation supports long-term calibration stability. | Use Scenario: Ruggedized barcode scanner with hot-swap battery and extended field operation. IC Role / Device Role / Timing Role: Charge controller interfacing with embedded PMIC and battery fuel gauge over SMBus/I²C (via host processor). Use Value: AutoComp reduces charge time by ~12% in high-impedance legacy battery packs; SOIC package enables reflow-compatible assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Li-Ion charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24013DRCR | 4.2 V fixed output, 500 mA max, 10-bit ADC for VBAT/TS, no AutoComp, 10-pin WSON | Includes integrated ADC and USB-compatible input current limit; lacks dynamic impedance compensation | Select for designs needing telemetry or USB power negotiation; not drop-in due to different pin count and feature set |
| TP4056 | 4.2 V fixed output, 1 A max, no temperature monitoring, no AutoComp, 8-pin SOP | Cost-optimized consumer-grade part; omits TS, COMP, and precision regulation (±1.5% vs ±1%) | Select for non-safety-critical, low-cost applications where thermal protection and fast charge are secondary |
Compared with BQ2057SNTR, BQ24013DRCR adds telemetry but removes AutoComp and requires PCB redesign; TP4056 cuts cost and features but sacrifices thermal safety and regulation accuracy-making BQ2057SNTR optimal for thermally constrained, performance-sensitive single-cell Li-Ion systems.
Availability
BQ2057SNTR is available at Aetrix Electronics and suitable for smartphone battery charging, wireless headset power management, portable medical monitors, industrial handheld scanners, and ruggedized portable instrumentation requiring stable component supply and long-lifecycle support.
Supply support for BQ2057SNTR 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 with emphasis on reliability, precision, and power efficiency.
The BQ2057SNTR belongs to TI's BENCHMARQ battery management product line, designed specifically for cost-sensitive, compact portable electronics requiring fully integrated, thermally robust linear Li-Ion charge control without microcontroller dependency.
FAQ
What is the exact charge regulation voltage of the BQ2057SNTR?
The BQ2057SNTR is the 4.2 V variant of the bq2057 family. Its nominal charge regulation voltage is 4.20 V, with a guaranteed tolerance of ±1% (4.158 V to 4.242 V) over −20°C to 70°C. This value is factory-trimmed and does not require external resistive programming - it is fixed and specified in the electrical characteristics table of the SLUS025F datasheet. The BQ2057SNTR achieves this accuracy using an internal bandgap reference and precision amplifier topology.
Does the BQ2057SNTR support dual-cell (8.4 V) charging?
No, the BQ2057SNTR does not support dual-cell charging. It is exclusively a single-cell 4.2 V variant. Dual-cell operation requires the BQ2057WTS (8.4 V) or BQ2057TTS (8.2 V) variants, which have different internal voltage references and are offered only in TSSOP (TS) or MSOP (DGK) packages - not SOIC. The BQ2057SNTR's internal regulation circuitry is hardwired for 4.2 V and cannot be reconfigured for higher voltages via external components.
What is the function of the COMP pin on the BQ2057SNTR?
The COMP pin on the BQ2057SNTR enables AutoComp - Texas Instruments' proprietary dynamic charge-rate compensation. When configured with external resistors (RCOMP1/RCOMP2), it injects a voltage proportional to sensed charge current into the regulation loop, raising the effective battery voltage setpoint to offset IR drop across the battery pack's internal impedance. For the BQ2057SNTR, AutoComp gain is 2.2 V/V in high-side sensing. Leaving COMP unconnected or floating is prohibited; it must be tied to VCC (high-side) or VSS (low-side) to disable compensation.
Can the BQ2057SNTR operate with low-side current sensing?
Yes, the BQ2057SNTR supports both high-side and low-side current sensing configurations. In low-side mode, the sense resistor (RSNS) is placed between battery negative (BAT−) and VSS, and the SNS pin references VSS. The current regulation threshold remains 105 mV (typ), but the low-side configuration shifts the V(TS1)/V(TS2) thresholds to be referenced to VSS instead of VCC - requiring recalibration of the thermistor divider. The datasheet confirms identical functionality and specification compliance for both topologies without additional components.
What happens to the BQ2057SNTR when input voltage (VCC) is removed?
When VCC drops below the battery voltage (V(BAT)), the BQ2057SNTR automatically enters low-power sleep mode. In this state, VCC current drops to ≤6 µA (typ), and the STAT pin goes high-impedance (Hi-Z) to indicate sleep or fault. This behavior prevents reverse current flow from the battery into the IC's supply rail and eliminates parasitic drain - critical for preserving battery charge during standby or adapter disconnection. The device resumes normal operation immediately upon VCC restoration above V(BAT) + 0.8 V.
BQ2057SNTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- -
- Current - Charging:
- -
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- -
- Interface:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
BQ2057SNTR FAQ
1.How can I place an order for BQ2057SNTR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2057SNTR 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 BQ2057SNTR reliable?
The price and inventory of BQ2057SNTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2057SNTR is usually 5 days.
3.What payment methods are accepted for BQ2057SNTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2057SNTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2057SNTR?
BQ2057SNTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2057SNTR 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 BQ2057SNTR?
For technical support, including BQ2057SNTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2057SNTR requirements.
6.How does Aetrix verify that BQ2057SNTR is sourced from the original manufacturer or authorized distributors?
All BQ2057SNTR 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 BQ2057SNTR meets industry standards.
7.What is the process for return or replacement of BQ2057SNTR?
All BQ2057SNTR units undergo pre-shipment inspection (PSI). If there is an issue with BQ2057SNTR, 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 BQ2057SNTR part is unused and in its original packaging.
Return procedure for BQ2057SNTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2057SNTR 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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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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