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Analog Devices Inc./Maxim Integrated DS2786BG+
- Part No.:
- DS2786BG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
DS2786BG+.pdf
- Description:
- IC BATT MONITOR LI-ION 10TDFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
DS2786BG+ from Maxim Integrated is a standalone OCV-based fuel gauge IC for Li-ion and Li-polymer battery packs, performing open-circuit voltage (OCV) lookup and coulomb counting to report remaining capacity in percent, cell voltage (±10 mV accuracy), bidirectional current (±3.4 A with 15 mΩ sense resistor), temperature (±3°C), and auxiliary inputs - all via I²C interface. It operates in host-side portable electronics or within battery packs.
For engineers reviewing the DS2786BG+ datasheet, DS2786BG+ pinout, DS2786BG+ application, or DS2786BG+ equivalent, this page delivers verified technical context, real-world measurement resolution (25 µV LSB current, 1.22 mV LSB voltage), active/sleep power states (50 µA / 1 µA), TDFN-EP package details, and validated alternatives for battery fuel gauging in cost-sensitive embedded systems.
Technical Context
The DS2786BG+ integrates a sigma-delta ADC, on-die temperature sensor, EEPROM-stored 9-point OCV vs. capacity lookup table, and programmable current offset bias register (COBR). It alternates between VIN, AIN0/AIN1 (or internal temp), and differential SNS–VSS measurements in a fixed 880 ms cycle, with VOUT precharge timing (13.7 ms typical) enabling ratiometric auxiliary sensing.
Its hybrid estimation engine combines OCV-based absolute capacity correction after relaxation (dV/dt < 2.44 mV/7.5 min) with continuous coulomb integration using a user-programmable scaling factor (78.125%/Vh resolution). The IACR accumulates ±204.8 mVh charge, supporting up to ±40.96 Ah with 5 mΩ RSNS - all accessible via 2-wire I²C at up to 400 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +2.5 V to +4.5 V - supports direct connection to system rail without LDO; compatible with 3.3 V and 3.6 V domains. |
| Battery Voltage Accuracy | ±10 mV - enables reliable low-battery warning at 3.3 V cutoff with <0.3% error across 0–4.5 V range. |
| Current Measurement | ±51.2 mV full-scale, 25 µV LSB - resolves ±1.667 mA with 15 mΩ RSNS, sufficient for smartphone-level load tracking. |
| Temperature Sensing | On-die sensor, 0.125°C LSB, ±3°C accuracy - eliminates external thermistor BOM cost while meeting handheld thermal monitoring needs. |
| I²C Interface | Standard-mode (up to 400 kHz), open-drain SDA/SCL with 0.2 µA pulldown - ensures bus disconnection detection and compatibility with legacy microcontrollers. |
| Power Consumption | 50 µA active (typ), 1 µA sleep (typ) - extends host-system standby time without sacrificing measurement fidelity. |
| Package | 10-pin TDFN-EP, 3 mm × 3 mm, exposed pad - provides thermal relief for continuous current sensing and fits compact battery pack PCBs. |
Pinout & Package
DS2786BG+ uses a lead-free, RoHS-compliant 10-pin TDFN-EP (3 mm × 3 mm) package with exposed pad (EP) connected to VSS for thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AIN1 | Auxiliary voltage input #1 | Ratiometric measurement of thermistor or pack ID resistor; replaced by on-die temperature sensor when ITEMP bit is set. |
| 2 AIN0 | Auxiliary voltage input #0 | Measures second ratiometric divider (e.g., thermistor network); shares VOUT reference and conversion timing with AIN1. |
| 3 SCL | I²C clock input | Input-only, 0.2 µA pulldown detects bus disconnection; transitions device from sleep to active mode when pulled high. |
| 4 SDA | I²C data I/O | Open-drain, 0.2 µA pulldown; supports standard-mode I²C read/write to Status, Configuration, and Measurement Registers. |
| 5 SNS | Current-sense input (high side) | Differential input referenced to VSS; accepts ±51.2 mV drop across external sense resistor (e.g., 15 mΩ). |
| 6 VSS | Ground reference | System ground return for current sense, ADC, and EP; must be tied to battery negative and exposed pad. |
| 7 VPROG | EEPROM programming voltage | 14–15 V input during factory programming; connected to VSS during normal operation to disable write access. |
| 8 VOUT | Reference voltage output | Drives resistive dividers for AIN0/AIN1; reduces current draw vs. dedicated reference IC and eliminates supply tolerance error. |
| 9 VIN | Battery voltage input | High-impedance (>15 MΩ) input for single-cell or averaged multi-cell pack voltage; supports 0–4.5 V range with 1.22 mV LSB. |
| 10 VDD | Power supply input | 2.5–4.5 V system rail input; requires local decoupling (e.g., 100 nF ceramic) per datasheet layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Hybrid OCV + coulomb counting | Delivers accurate %SOC immediately on pack insertion and maintains precision during discharge without requiring learn cycles. |
| VOUT-driven ratiometric sensing | Enables precise thermistor and pack-ID resistor measurement without external reference, removing supply-voltage dependency. |
| Programmable current offset (COBR) | Corrects static sense-resistor or amplifier offset errors in 25 µV steps over ±3.2 mV range, stored in NV memory. |
| Configurable OCV detection logic | Adjustable dV/dt threshold (0–9.15 mV/7.5 min) and current threshold (0–6.375 mV/RSNS) enable robust relaxation-state identification. |
| EEPROM-stored OCV model | 9-point piecewise-linear voltage-vs-capacity curve (factory default or user-customizable) allows adaptation to diverse Li-ion chemistries. |
Applications
| Smartphone Battery Management | Digital Camera Power Monitoring |
|---|---|
|
Use Scenario: Real-time state-of-charge reporting during video recording and flash charging cycles. IC Role / Device Role / Timing Role: Standalone fuel gauge measuring VIN, SNS–VSS, and on-die temperature every 880 ms to update %SOC, voltage, and current registers via I²C. Use Value: Eliminates need for host MCU to run complex battery algorithms; achieves ±10 mV voltage accuracy and ±3.4 A current range with 15 mΩ RSNS. |
Use Scenario: Accurate low-battery warning during burst-mode image capture and LCD playback. IC Role / Device Role / Timing Role: Host-side coulomb counter that corrects SOC using OCV after camera idle periods, synchronized to 7.5-min dV/dt evaluation windows. Use Value: Provides first-cycle accuracy without learning, critical for consumer devices shipped with partial charge; supports 0.5% SOC resolution. |
| MP3 Player Runtime Estimation | Portable Medical Device Battery Safety |
|
Use Scenario: Predicting remaining playback time under varying headphone load and Bluetooth streaming. IC Role / Device Role / Timing Role: Measures bidirectional current (±3.4 A) and cell voltage to compute accumulated charge (±13.65 Ah with 15 mΩ RSNS) and %SOC. Use Value: Enables precise runtime estimation using integrated IACR and learned capacity scaling factor, reducing firmware complexity. |
Use Scenario: Monitoring battery health and thermal limits in handheld diagnostic tools with strict safety requirements. IC Role / Device Role / Timing Role: Dual-role sensor: reports temperature via on-die sensor (±3°C) and validates pack identity via AIN0 ratiometric resistor measurement. Use Value: Supports regulatory compliance (e.g., IEC 62368) with traceable, calibrated temperature and voltage data stored in on-chip EEPROM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27426YZFT | TI's single-cell fuel gauge with Impedance Track™ algorithm; requires host calibration; no on-die temperature sensor (external NTC needed). | Designed for integration into battery packs with embedded protection circuits; less suitable for host-side mounting. | Choose BQ27426YZFT if system already uses TI ecosystem and requires impedance-based aging compensation - but expect added BOM and layout complexity. |
| MAX17048G+T | Maxim's newer 1-cell fuel gauge with ModelGauge™ m3 algorithm; higher accuracy (±5 mV voltage, ±0.5% SOC); includes built-in Coulomb counter and OCV model. | Targets next-gen wearables and IoT; supports lower quiescent current (1.5 µA sleep) and smaller WLP package (2.0 mm × 1.5 mm). | Select MAX17048G+T for new designs demanding tighter accuracy and space savings - though DS2786BG+ remains optimal for cost-constrained, proven-platform upgrades. |
Compared with BQ27426YZFT and MAX17048G+T, the DS2786BG+ offers unique value in host-side deployment, integrated temperature sensing, and zero-learn-cycle startup - making it ideal for legacy portable designs where firmware changes are constrained and BOM minimization is critical.
Availability
DS2786BG+ is available at Aetrix Electronics and suitable for smartphone battery management, digital camera power monitoring, MP3 player runtime estimation, portable medical device battery safety, and handheld industrial scanner applications requiring stable component supply and long-term lifecycle support.
Supply support for DS2786BG+ 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, communications, computing, and consumer markets.
The DS2786BG+ belongs to Maxim's battery-fuel-gauge product line, designed specifically for cost-sensitive, host-side battery monitoring in portable electronics - emphasizing rapid %SOC availability, minimal external components, and EEPROM-configurable OCV models.
FAQ
What is the primary function of the DS2786BG+?
The DS2786BG+ is a standalone fuel gauge IC that estimates remaining battery capacity (%) for Li-ion and Li-polymer cells using a hybrid method: open-circuit voltage (OCV) lookup from an EEPROM-stored 9-point model combined with real-time coulomb counting. It reports voltage, current, temperature, and auxiliary inputs via I²C - all without requiring host-side learning cycles. The DS2786BG+ delivers this functionality in a compact 10-pin TDFN-EP package with ultra-low power consumption.
Does the DS2786BG+ require calibration before use?
No, the DS2786BG+ does not require calibration or a learn cycle before first use. It provides accurate relative capacity immediately upon power-up using an initial OCV-based estimate derived from the factory-default or user-programmed cell model. While optional learning improves long-term accuracy as the cell ages, the DS2786BG+ achieves usable %SOC out-of-box - a key advantage over many competing fuel gauges. This behavior is intrinsic to the DS2786BG+ architecture and confirmed in its datasheet initialization sequence.
How does the DS2786BG+ measure temperature?
The DS2786BG+ measures temperature using an integrated on-die sensor with 0.125°C LSB resolution and ±3°C accuracy across –20°C to +70°C. When enabled via the ITEMP bit in the Status/Configuration Register, this sensor replaces the AIN1 auxiliary input channel - eliminating the need for an external thermistor. Temperature readings update every 1760 ms and are reported in the Temperature Register (address 0Ah–0Bh). This capability is built into the DS2786BG+ silicon and requires no additional components.
What is the role of the VOUT pin on the DS2786BG+?
The VOUT pin on the DS2786BG+ supplies a stable reference voltage to drive resistive dividers for AIN0 and AIN1 measurements. By providing this reference internally, the DS2786BG+ enables ratiometric sensing - which cancels out supply-voltage tolerance errors and improves accuracy of thermistor or pack-ID resistor readings. VOUT activates 13.7 ms before each auxiliary conversion to ensure settling. This feature is specific to the DS2786BG+ design and reduces system BOM cost versus solutions requiring external references.
Can the DS2786BG+ be used inside a battery pack?
Yes, the DS2786BG+ can be mounted either on the host system PCB or directly inside the battery pack. Its 10-pin TDFN-EP package (3 mm × 3 mm) and integrated protection features - including ±6 V absolute max rating on most pins and 15 V tolerance on VPROG - support safe integration in pack environments. The DS2786BG+ communicates via I²C, so pack-integrated use requires routing SDA/SCL to the host, while host-side placement simplifies interconnect. Both configurations are validated in Maxim's application examples.
DS2786BG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
DS2786BG+ FAQ
1.How can I place an order for DS2786BG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2786BG+ 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 DS2786BG+ reliable?
The price and inventory of DS2786BG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2786BG+ is usually 5 days.
3.What payment methods are accepted for DS2786BG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2786BG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2786BG+?
DS2786BG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2786BG+ 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 DS2786BG+?
For technical support, including DS2786BG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2786BG+ requirements.
6.How does Aetrix verify that DS2786BG+ is sourced from the original manufacturer or authorized distributors?
All DS2786BG+ 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 DS2786BG+ meets industry standards.
7.What is the process for return or replacement of DS2786BG+?
All DS2786BG+ units undergo pre-shipment inspection (PSI). If there is an issue with DS2786BG+, 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 DS2786BG+ part is unused and in its original packaging.
Return procedure for DS2786BG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS2786BG+ Tags
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