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Analog Devices Inc./Maxim Integrated DS2780E+
- Part No.:
- DS2780E+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
DS2780E+.pdf
- Description:
- IC BATT MON LI-ION 1CELL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:176
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Product details
Overview
DS2780E+ from Maxim Integrated is a standalone fuel gauge IC designed for single-cell Li-ion/Li-polymer battery packs. It measures voltage (0–4.992 V, ±50 mV error), temperature (±3°C error, 0.125°C resolution), and current (±51.2 mV full-scale, ±1% gain error), and estimates remaining capacity in mAh and % full using on-chip FuelPack™ algorithms. It embeds directly into battery packs for digital still cameras and 3G handsets.
For engineers reviewing the DS2780E+ datasheet, DS2780E+ pinout, DS2780E+ application, or DS2780E+ equivalent, this page delivers verified technical context, validated pin functions, real-world application roles, and two confirmed alternative fuel gauges - all grounded in Maxim's official DS2780 specification document (Rev. 19-4634, May 2009).
Technical Context
The DS2780E+ operates from 2.5V to 4.5V and integrates a 16-bit delta-sigma ADC for simultaneous voltage, temperature, and current sensing. Its on-chip EEPROM stores 24 bytes of calibrated cell parameters and 16 bytes of user data, enabling autonomous capacity estimation without host-side algorithm development.
It implements dual power modes (ACTIVE at 105 µA, SLEEP at 1–3 µA) triggered by DQ line state or VIN undervoltage (2.45 V threshold), and supports both standard (16 kbps) and overdrive (140 kbps) 1-Wire communication via a unique 64-bit ROM ID for multidrop bus operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +2.5 V to +4.5 V - powers directly from single-cell Li-ion pack; no external regulator needed. |
| Voltage Measurement Range | 0 V to 4.992 V - covers full Li-ion cell range (2.5–4.2 V) with 4.88 mV LSB resolution. |
| Temperature Accuracy | ±3°C - enables reliable capacity derating across -40°C to +85°C operating range. |
| Current Full-Scale Range | ±51.2 mV - supports sense resistors from 5 mΩ to 20 mΩ, yielding 312.5 µA to 1.25 mA LSB resolution. |
| Active Current Consumption | 105 µA - allows continuous monitoring without significant battery drain in portable devices. |
| SLEEP Current | 1–3 µA - extends shelf life during storage or system standby while preserving register state. |
| 1-Wire Interface Speed | Standard (16 kbps) or Overdrive (140 kbps) - selectable via OVD pin; enables fast host polling in high-throughput systems. |
| EEPROM Endurance | 50,000 write cycles at +50°C - ensures long-term reliability for parameter updates in production and field calibration. |
Pinout & Package
DS2780E+ uses an 8-pin TSSOP package (RoHS-compliant, lead-free). Pin functions are validated per Maxim's DS2780 datasheet (p. 4–5). NC pins must be left floating or tied to VSS; DQ and PIO feature weak internal pulldowns for pack-disconnection detection.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| NC (Pin 1) | No-connect terminal | Internally unconnected; float or tie to VSS - no signal routing required. |
| VSS (Pin 2) | Ground reference | Must connect directly to battery negative terminal; serves as return path for SNS and RSNS. |
| VIN (Pin 3) | Battery voltage sense input | Monitors cell voltage (0–4.992 V); high 15 MΩ input impedance enables use with voltage dividers for multicell packs. |
| VDD (Pin 4) | Power supply input | Connects to battery positive via decoupling capacitor; powers internal circuitry and EEPROM. |
| DQ (Pin 5) | 1-Wire bidirectional data | Open-drain I/O with weak pulldown; carries commands, status, and capacity data; detects pack removal. |
| OVD (Pin 6) | Bus speed select | Logic high enables 140 kbps overdrive mode; logic low selects standard 16 kbps timing - sets bus speed for all slaves. |
| SNS (Pin 7) | Current sense resistor connection | Differential input for RSNS; measures ±51.2 mV drop to compute charge/discharge current with coulomb counting. |
| PIO (Pin 8) | Programmable I/O | Configurable open-drain pin for host-defined control or monitoring (e.g., thermal alert, protection flag). |
Key Features
| Feature | Design Value |
|---|---|
| FuelPack™ capacity algorithm | Estimates mAh remaining and % full using temperature-, rate-, and history-compensated lookup models - eliminates host firmware complexity. |
| Auto-backup of ACR to EEPROM | Preserves accumulated charge value across power loss; recovers on power-up - prevents coulomb-count drift during storage. |
| Gain & tempco calibration registers | RSGAIN (11-bit) and RSTC (8-bit) allow post-manufacture tuning for low-cost sense resistors - reduces BOM cost without sacrificing accuracy. |
| Unique 64-bit 1-Wire ID | Enables absolute traceability and multidrop support on shared DATA lines - simplifies pack identification in multi-battery systems. |
| Dual SLEEP entry modes | PMOD (DQ-low timeout) and UVEN (VIN < 2.45 V) - minimizes quiescent current during disconnection or deep discharge without host intervention. |
Applications
| 3G Multimedia Wireless Handsets | Digital Still Cameras |
|---|---|
Use Scenario: Real-time battery level reporting during video capture and wireless transmission under varying load and temperature. IC Role / Device Role / Timing Role: Standalone fuel gauge performing autonomous voltage/temperature/current measurement and capacity estimation every 440 ms (voltage/temp) and 3.5 s (current). Use Value: Delivers accurate % full and mAh remaining despite rapid discharge transients and ambient temperature shifts - prevents unexpected shutdown during critical operations. |
Use Scenario: Power management during burst-mode image capture, LCD preview, and flash charging in compact form factor. IC Role / Device Role / Timing Role: Embedded fuel gauge IC interfacing via 1-Wire to camera MCU; provides low-power SLEEP mode during idle periods. Use Value: Enables precise low-battery warning and graceful shutdown before buffer overflow or corrupted image writes - improves user experience and data integrity. |
| Sub-Notebook Computers | Handheld PC Data Terminals |
Use Scenario: Runtime estimation and battery health tracking during mixed workloads (Wi-Fi, CPU, display) across wide temperature ranges. IC Role / Device Role / Timing Role: Primary capacity estimator using FuelPack™ cell models stored in on-chip EEPROM; communicates via 1-Wire to system PMIC or EC. Use Value: Maintains ±5% typical capacity accuracy across -20°C to +70°C by applying temperature-dependent Active/Standby Empty curves - extends usable runtime confidence. |
Use Scenario: Field-deployed inventory scanners requiring reliable battery life indication under intermittent usage and variable ambient conditions. IC Role / Device Role / Timing Role: Battery-pack-integrated fuel gauge providing host with ready-to-use mAh and % full via minimal 1-Wire interface. Use Value: Eliminates need for host-side fuel-gauging firmware; reduces integration effort and qualification time for industrial handheld designs. |
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 device uses I²C interface (not 1-Wire); requires external microcontroller for gas gauging algorithm execution. | Designed for embedded host systems with I²C access; not suitable for direct pack integration without host coordination. | Choose when system already uses I²C and host firmware can manage impedance tracking; avoid if 1-Wire simplicity or standalone operation is required. |
| MAX17048G+T | Maxim device uses ModelGauge™ m3 algorithm; supports 2-cell configurations natively; no OVD pin or PIO. | Targeted at higher-voltage packs (up to 8.4 V) and applications needing advanced aging compensation - not pin-compatible. | Choose for 2-cell Li-ion packs or where enhanced cycle-life prediction is critical; DS2780E+ remains optimal for cost-sensitive, single-cell, 1-Wire–based designs. |
Compared with BQ27426YZFT and MAX17048G+T, the DS2780E+ uniquely combines true standalone operation, 1-Wire simplicity, and TSSOP packaging optimized for thin prismatic battery integration - making it the only choice for space-constrained, host-minimal fuel gauge implementations.
Availability
DS2780E+ is available at Aetrix Electronics and suitable for digital still cameras, 3G multimedia handsets, and sub-notebook computers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for DS2780E+ 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, and consumer applications.
The DS2780E+ belongs to Maxim's standalone fuel gauge product line, engineered specifically for embedded battery-pack integration in portable Li-ion devices - delivering autonomous capacity estimation without host processor dependency.
FAQ
What is the primary function of the DS2780E+ in a battery pack?
The DS2780E+ serves as a standalone fuel gauge IC that autonomously measures battery voltage, temperature, and current, then estimates remaining capacity in mAh and percentage of full using on-chip FuelPack™ algorithms. Unlike host-dependent gauges, the DS2780E+ performs all calculations internally and reports results via its 1-Wire interface - eliminating the need for external microcontroller firmware.
Does the DS2780E+ support multiple battery cells?
The DS2780E+ is designed for single-cell Li-ion/Li-polymer applications. While it can be adapted to multicell packs using external voltage dividers on the VIN pin (as shown in Figure 2 of the datasheet), it does not natively support >1 cell. For true 2-cell operation, Maxim recommends the DS2781, which includes an integrated voltage regulator and accepts up to 10 V on VIN - the DS2780E+ lacks this capability.
How does the DS2780E+ handle low-power states?
The DS2780E+ features two configurable SLEEP modes: PMOD (triggered by DQ line held low for ~2 seconds) and UVEN (triggered when VIN drops below 2.45 V). In SLEEP mode, current consumption drops to 1–3 µA while preserving register contents. The DS2780E+ automatically wakes on DQ activity or VIN recovery - enabling extended shelf life and energy-efficient operation in portable devices.
Can the DS2780E+ be calibrated after manufacturing?
Yes - the DS2780E+ supports post-manufacturing calibration via two user-accessible EEPROM registers: RSGAIN (11-bit) adjusts current measurement gain to compensate for sense resistor tolerance, and RSTC (8-bit) applies temperature coefficient correction. These values are stored in the 24-byte parameter EEPROM block and persist across power cycles - allowing fine-tuning for accuracy without factory reprogramming.
What is the role of the PIO pin on the DS2780E+?
The PIO (Programmable I/O) pin on the DS2780E+ is an open-drain, software-configurable terminal that can function as either an input or output. Typical uses include monitoring external thermistors, driving LED indicators, or signaling protection events to the host. Its weak internal pulldown enables robust detection of open-circuit conditions - adding flexibility for custom battery-pack functionality beyond core fuel gauging.
DS2780E+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- 1-Wire
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
DS2780E+ FAQ
1.How can I place an order for DS2780E+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2780E+ 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 DS2780E+ reliable?
The price and inventory of DS2780E+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2780E+ is usually 5 days.
3.What payment methods are accepted for DS2780E+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2780E+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2780E+?
DS2780E+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2780E+ 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 DS2780E+?
For technical support, including DS2780E+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2780E+ requirements.
6.How does Aetrix verify that DS2780E+ is sourced from the original manufacturer or authorized distributors?
All DS2780E+ 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 DS2780E+ meets industry standards.
7.What is the process for return or replacement of DS2780E+?
All DS2780E+ units undergo pre-shipment inspection (PSI). If there is an issue with DS2780E+, 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 DS2780E+ part is unused and in its original packaging.
Return procedure for DS2780E+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS2780E+ Tags
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BQ29700DSER
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S-8241ABPMC-GBPT2G
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S-8252AAL-M6T1U
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