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Texas Instruments BQ2057TTSTRG4
- Part No.:
- BQ2057TTSTRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2057TTSTRG4.pdf
- Description:
- IC BATT CHG LI-ION 2CELL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,797
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Product details
Overview
BQ2057TTSTRG4 from Texas Instruments is a fixed 8.2 V, dual-cell Li-ion/Li-polymer linear charge management IC with integrated voltage/current regulation, AutoComp™ dynamic impedance compensation, temperature monitoring, and precharge conditioning. It supports high- or low-side current sensing, delivers ±1% voltage regulation accuracy, and features 0.3-V dropout for thermal efficiency in compact portable systems like telematics control units and EPOS card readers.
For engineers reviewing the BQ2057TTSTRG4 datasheet, BQ2057TTSTRG4 pinout, BQ2057TTSTRG4 application, or BQ2057TTSTRG4 equivalent, key selection criteria include its 8.2 V regulation voltage, −20°C to 70°C operating range, TSSOP-8 package, 103.6–137.5 mV current-sense threshold (high-side), and compatibility with PNP or P-channel MOSFET pass devices.
Technical Context
The BQ2057TTSTRG4 implements a three-phase linear charging algorithm-conditioning, constant-current, and constant-voltage-with automatic recharge triggered at VO(REG)−196 mV to VO(REG)−204 mV. It uses external thermistor-based temperature sensing referenced to VCC, with thresholds at 30% VCC (lower) and 60% VCC (upper), enabling safe charge inhibit outside user-defined thermal limits.
Its charge-control output (CC pin) drives an external PNP or P-channel MOSFET in source-follower configuration, while the SNS pin accepts either high-side (VCC–SNS) or low-side (VSS–SNS) sense resistor placement without additional circuitry. The COMP pin enables AutoComp™ gain of 2.09–2.76 V/V for dynamic charge-rate adjustment based on battery internal impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage | 8.2 V ±0.081 V - Fixed output for dual-cell Li-ion/Li-pol packs; no external feedback required. |
| Current Sense Threshold | 103.6–137.5 mV - Sets charge current via external sense resistor; supports both high- and low-side configurations. |
| Voltage Regulation Accuracy | Better than ±1% over −20°C to 70°C - Ensures cell safety and longevity without calibration. |
| Dropout Voltage | 0.3 V - Minimizes power dissipation and thermal stress in pass element during high-current phases. |
| Precharge Threshold | 5.9–6.22 V - Enables safe revival of deeply discharged dual-cell batteries before full-current charging. |
| Charge Termination Current | −30 to −4 mV at SNS - Detects taper-down to ~10% of regulation current for reliable end-of-charge detection. |
| AutoComp Gain | 2.09–2.76 V/V - Dynamically adjusts regulation voltage to compensate for battery impedance rise during charge. |
| Operating Temperature | −20°C to 70°C - Validated industrial-grade range for automotive telematics and medical portable equipment. |
Pinout & Package
Package: 8-pin TSSOP (TS), body size 3.00 mm × 4.40 mm, exposed pad not specified, RoHS-compliant.
| 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 | Direct connection to battery positive terminal; enables precise voltage regulation and recharge threshold detection. |
| COMP | AutoComp compensation input | Adjusts charge rate dynamically by scaling regulation voltage in response to battery impedance changes. |
| CC | Charge control output | Source-follower driver for external PNP transistor or P-channel MOSFET; regulates current/voltage loop. |
| VSS | Ground reference | Common return for battery negative, sense resistor (low-side), and internal circuitry; critical for accurate current measurement. |
| STAT | Charge status output | 3-state signal (High = charging, Low = done, Hi-Z = fault/sleep); drives LED or interfaces with host processor. |
| VCC | Supply voltage input | 4.5–15 V input; powers IC and serves as reference for high-side current sensing configuration. |
| TS | Temperature sense input | Monitors NTC/PTC thermistor network; disables charge if voltage falls outside 30%–60% VCC window. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated battery conditioning | Applies ~10% of regulation current to revive cells below 5.9 V, reducing heat generation in pass device during initial charge. |
| AutoComp™ dynamic compensation | Adjusts voltage setpoint in real time using COMP pin feedback, shortening charge time without compromising safety. |
| Programmable charge termination | Detects current taper to −30 to −4 mV at SNS pin, ensuring full capacity without overcharge risk. |
| Flexible current sensing topology | Supports both high-side (VCC–SNS) and low-side (VSS–SNS) resistor placement-no extra op-amps or level shifters needed. |
| Automatic low-power sleep mode | Enters µA-level sleep (<6 µA) when VCC drops below BAT voltage, preventing battery drain during input removal. |
| Three-state STAT output | Provides unambiguous status signaling (charging/done/fault-sleep) for single/dual LED or microcontroller GPIO interface. |
Applications
| Emergency Call Systems | Telematics Control Unit |
|---|---|
Use Scenario: Compact, battery-backed emergency voice/data transmission module requiring reliable charge management under variable ambient temperatures. IC Role / Device Role / Timing Role: Linear charge controller managing dual-cell Li-ion pack with temperature-aware preconditioning and AutoComp™-enhanced charge speed. Use Value: Prevents thermal runaway via TS-input monitoring and reduces field failure rates through ±1% voltage regulation accuracy. | Use Scenario: In-vehicle data acquisition and GPS tracking unit powered by removable dual-cell Li-polymer battery. IC Role / Device Role / Timing Role: Primary charge management IC handling conditioning, CC/CV phases, and automatic recharge after load-induced voltage sag. Use Value: Enables fast re-entry into service after battery replacement due to integrated precharge and 0.3-V dropout efficiency. |
| EPOS Card Reader | Portable Medical Equipment |
Use Scenario: Handheld point-of-sale terminal with hot-swappable battery and strict safety certification requirements. IC Role / Device Role / Timing Role: Safety-certified linear charger enforcing thermal cutoff, minimum-voltage preconditioning, and precise 8.2 V regulation. Use Value: Meets IEC 62368-1 compliance via hardware-enforced charge inhibit outside V(TS1)/V(TS2) thresholds. | Use Scenario: Battery-powered patient monitor used in ambulatory and clinical settings with infrequent but critical runtime demands. IC Role / Device Role / Timing Role: Dual-cell Li-ion charge manager delivering guaranteed capacity recovery via programmable I(TERM) and V(RCH) thresholds. Use Value: Extends usable battery life per charge cycle through AutoComp™-optimized voltage profile and low-power sleep mode. |
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 |
|---|---|---|---|
| BQ2057WTSR | Fixed 8.4 V regulation (vs. 8.2 V); identical TSSOP-8 package and pinout; same AutoComp gain range. | Targeted at higher-capacity dual-cell Li-ion packs where 8.4 V per 2S string is required. | Select BQ2057WTSR only when battery chemistry mandates 4.2 V/cell nominal; verify thermal design for +200 mV higher regulation voltage. |
| TP4056 | Single-cell only (4.2 V), no temperature sensing, no AutoComp, no precharge conditioning; SO-8 package with different pinout. | Limited to cost-sensitive consumer electronics without safety-critical thermal or low-voltage recovery requirements. | Not suitable for dual-cell or temperature-monitored applications; requires redesign of sense/resistor layout and firmware status handling. |
Compared with BQ2057TTSTRG4, BQ2057WTSR offers higher voltage compliance for 4.2 V/cell chemistries but lacks flexibility for 4.1 V variants, while TP4056 omits essential safety and performance features-making BQ2057TTSTRG4 the only option supporting certified dual-cell, thermally aware, impedance-compensated charging in TSSOP-8.
Availability
BQ2057TTSTRG4 is available at Aetrix Electronics and suitable for telematics control units, EPOS card readers, and portable medical equipment requiring stable component supply, long-lifecycle support, and validated thermal safety compliance.
Supply support for BQ2057TTSTRG4 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 leadership in battery management and precision analog ICs.
The BQ2057 series was designed specifically for cost-sensitive, space-constrained portable electronics requiring fully integrated, thermally robust linear charging-targeting automotive telematics, medical wearables, and secure transaction devices.
FAQ
What is the exact regulation voltage of the BQ2057TTSTRG4?
The BQ2057TTSTRG4 has a fixed charge-regulation voltage of 8.2 V, with a tolerance of ±0.081 V (±1%) over −20°C to 70°C. This value is factory-trimmed and does not require external resistive feedback. It is intended for dual-cell Li-ion or Li-polymer battery packs where each cell is rated at 4.1 V nominal. The BQ2057TTSTRG4 datasheet confirms this in Section 8.5 under "BATTERY VOLTAGE REGULATION" for part number BQ2057T.
Does the BQ2057TTSTRG4 support both high-side and low-side current sensing?
Yes, the BQ2057TTSTRG4 supports both high-side and low-side current sensing configurations without additional components. The SNS pin accepts voltage drop either between VCC and SNS (high-side) or between VSS and SNS (low-side). The datasheet specifies distinct current-sense threshold ranges for each: 103.6–137.5 mV for high-side and 108.1–143 mV for low-side sensing, enabling flexible PCB layout and optimal thermal partitioning in the BQ2057TTSTRG4 application.
How does the AutoComp™ feature work in the BQ2057TTSTRG4?
The AutoComp™ feature in the BQ2057TTSTRG4 dynamically adjusts the voltage regulation setpoint based on real-time battery internal impedance. It uses the COMP pin to accept a feedback signal that scales the output voltage by a gain of 2.09–2.76 V/V. As battery impedance rises during charging, AutoComp™ increases the effective regulation voltage slightly to maintain current delivery, reducing total charge time while staying within safe voltage limits-confirmed in Section 9.3.6 and Table 8-5 of the BQ2057TTSTRG4 datasheet.
What is the function of the STAT pin on the BQ2057TTSTRG4?
The STAT pin on the BQ2057TTSTRG4 provides three-state status indication: High (charging active), Low (charge complete), or Hi-Z (temperature fault or sleep mode). It can directly drive single/dual LEDs or interface with a host microcontroller's GPIO. When interfacing with a processor, the Hi-Z state is detected by toggling an output port and reading back the STAT pin level-this behavior is documented in Section 10.1.8 and Figure 10-11 of the BQ2057TTSTRG4 datasheet.
What temperature monitoring capability does the BQ2057TTSTRG4 provide?
The BQ2057TTSTRG4 monitors battery temperature via the TS pin using an external NTC or PTC thermistor network. It compares the TS voltage to internal thresholds at 30% VCC (V(TS1)) and 60% VCC (V(TS2)); charge is inhibited if the voltage falls outside this window. This ratiometric design ensures immunity to VCC fluctuations. The BQ2057TTSTRG4 datasheet specifies these thresholds in Section 8.5 and details implementation in Figures 10-9 and 10-10.
BQ2057TTSTRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 8.2V
- Voltage - Supply (Max):
- 15V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
BQ2057TTSTRG4 FAQ
1.How can I place an order for BQ2057TTSTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2057TTSTRG4 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 BQ2057TTSTRG4 reliable?
The price and inventory of BQ2057TTSTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2057TTSTRG4 is usually 5 days.
3.What payment methods are accepted for BQ2057TTSTRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2057TTSTRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2057TTSTRG4?
BQ2057TTSTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2057TTSTRG4 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 BQ2057TTSTRG4?
For technical support, including BQ2057TTSTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2057TTSTRG4 requirements.
6.How does Aetrix verify that BQ2057TTSTRG4 is sourced from the original manufacturer or authorized distributors?
All BQ2057TTSTRG4 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 BQ2057TTSTRG4 meets industry standards.
7.What is the process for return or replacement of BQ2057TTSTRG4?
All BQ2057TTSTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2057TTSTRG4, 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 BQ2057TTSTRG4 part is unused and in its original packaging.
Return procedure for BQ2057TTSTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2057TTSTRG4 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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