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Analog Devices Inc./Maxim Integrated DS2770BE+
- Part No.:
- DS2770BE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
DS2770BE+.pdf
- Description:
- IC BATT MFUNC MULTI-CHEM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,587
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Product details
Overview
DS2770BE+ from Maxim Integrated is a battery monitor and charge controller IC for rechargeable lithium-ion/polymer and NiMH battery packs. It integrates a 25mΩ internal current-sense resistor, 15-bit bidirectional current measurement (62.5µA LSB), 4.88mV voltage resolution, 0.125°C temperature resolution, and Dallas 1-Wire interface - enabling single-wire host communication in compact battery-pack designs.
For engineers reviewing the DS2770BE+ datasheet, DS2770BE+ pinout, DS2770BE+ application, or DS2770BE+ equivalent, this device supports precise remaining capacity estimation, safety-critical charge control with dual-chemistry support (Li-ion pulse charge / NiMH dT/dt termination), and nonvolatile parametric storage in battery management systems for portable medical, power tools, and industrial handheld equipment.
Technical Context
The DS2770BE+ implements a dedicated analog front-end with integrated 25mΩ sense resistor, 15-bit signed current ADC, and on-chip thermal sensor - all synchronized to a 55ms measurement cycle for voltage and temperature, and 3.52s for current accumulation. Its 1-Wire interface uses open-drain DQ with factory-programmed 64-bit ID, eliminating address conflicts in multi-cell or multi-pack systems.
Charge control logic operates via UV (undervoltage recovery) and CC (charge gate) outputs, supporting user-selectable CTYPE (lithium/NiMH) and CINI (auto-start on VCH presence) configuration bits stored in lockable EEPROM. The device features two power modes: Active Mode (80µA typical) for continuous monitoring and Sleep Mode (0.5µA typical) triggered by sustained DQ low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Measurement | 15-bit bidirectional; 62.5µA LSB with internal 25mΩ resistor - enables ±2.048A full-scale range for accurate coulomb counting in Li-ion packs. |
| Voltage Resolution | 4.88mV over 0–4.992V range - sufficient for cell-level voltage monitoring with ±1LSB accuracy at 3.7V nominal. |
| Temperature Resolution | 0.125°C via integrated sensor - supports dT/dt termination thresholds per ambient zone (e.g., 0.6°C/min at 15–40°C for NiMH). |
| Memory | 40 bytes lockable EEPROM + 16 bytes SRAM - stores calibrated parameters, charge history, and security-critical data with byte-level locking. |
| Interface | Dallas 1-Wire (DQ pin); 1.8V logic compatible - reduces interconnect to one signal + ground, simplifying battery pack wiring and connector count. |
| Power Modes | Active mode: 80µA typical; Sleep mode: 0.5µA typical - extends shelf life and preserves state during long-term storage without external wake-up circuitry. |
| Charge Voltage | Factory-configured 4.2V threshold - matches standard Li-ion cell termination voltage, eliminating need for external voltage reference trimming. |
Pinout & Package
DS2770BE+ is housed in a 16-pin TSSOP package (4.4mm × 5mm, 0.65mm pitch) with exposed pad for thermal dissipation. Pin assignments are validated per Maxim DS2770 datasheet Rev. 052605, pages 4–5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UV | Battery undervoltage detect output | Open-drain active-low signal indicating sub-3.0V cell recovery state; gates trickle-charge path independent of CINI/temperature. |
| CC | Charge-control output | Open-drain active-low gate driver for external PNP/MOSFET switch; pulses during Li-ion charge to implement tCD decay termination. |
| VCH | Charge-supply input | Monitors presence of external charger; enables auto-start fast charge when CINI = 1 and VCH > VDD. |
| SNS | Sense resistor connection | Connects to battery negative terminal; internal 25mΩ resistor bridges SNS–VSS - no external resistor required in this variant. |
| IS1 / IS2 | Current-sense filter inputs | Form RC low-pass filter (with 0.1µF cap) to suppress noise before ADC sampling; referenced to VSS in internal-resistor configuration. |
| VIN | Voltage-sense input | Direct connection to battery positive terminal; measures cell voltage with 4.88mV resolution for SOC and protection algorithms. |
| DQ | 1-Wire data I/O | Single-wire bidirectional interface with 64-bit unique ID; supports parasitic power mode and disconnect detection via internal pulldown. |
| VDD | Power supply input | 2.7V–5.5V operation; powers internal regulators and logic; supplies 1-Wire pullup when parasitic mode disabled. |
| VSS | Device ground | Must connect directly to battery negative terminal; serves as reference for all analog measurements and sense resistor return path. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25mΩ current-sense resistor | Eliminates external precision resistor and layout sensitivity; factory-trimmed for ±1% gain error across temperature. |
| 42-day elapsed time meter | 1024-hour timer with 56s resolution - tracks battery aging, usage cycles, and warranty expiration without host intervention. |
| Lockable EEPROM blocks | Three independently lockable regions (16B/16B/8B); protects calibration data, charge thresholds, and security keys from overwrite. |
| Programmable charge termination | Configurable dT/dt (NiMH) or tCD decay (Li-ion) plus secondary limits: fixed 50°C max temp and user-defined charge timer (56s/count). |
| Low-power sleep mode | 0.5µA quiescent current with automatic wake-on-VCH or DQ high - maintains state while reducing self-discharge impact on battery standby life. |
Applications
| Smart Power Tools | Portable Medical Devices |
|---|---|
|
Use Scenario: Cordless drill battery pack with runtime estimation and overtemperature shutdown. IC Role / Device Role / Timing Role: DS2770BE+ monitors real-time current/voltage/temperature, accumulates charge/discharge Ah, and terminates charge via dT/dt or pulse decay. Use Value: Enables accurate remaining runtime prediction (±3%) and prevents thermal runaway during high-current bursts up to 2A. |
Use Scenario: Rechargeable defibrillator backup battery requiring traceable charge history and safety certification. IC Role / Device Role / Timing Role: DS2770BE+ logs charge cycles, stores calibration data in lockable EEPROM, and enforces dual-termination (temp + timer) per IEC 62366. Use Value: Provides auditable battery health records and meets Class II medical device requirements for fail-safe charge control. |
| Industrial Handheld Scanners | Ruggedized Tablets |
|
Use Scenario: Warehouse barcode scanner operating 12h/day with hot-swap battery capability. IC Role / Device Role / Timing Role: DS2770BE+ performs coulomb counting using internal sense resistor, reports SOC via 1-Wire, and manages low-voltage recovery via UV output. Use Value: Delivers consistent 92%+ SOC accuracy across 500+ cycles and enables seamless battery replacement without host firmware changes. |
Use Scenario: Field-service tablet used in extreme temperatures (-20°C to 60°C) with Li-ion battery pack. IC Role / Device Role / Timing Role: DS2770BE+ adapts dT/dt thresholds based on ambient zone (Table 2), disables charge below 0°C, and logs thermal events in EEPROM. Use Value: Prevents lithium plating at low temperatures and ensures safe charging across full industrial operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor and charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ20Z75-V160 | Uses SMBus interface; no integrated sense resistor; requires external 10mΩ resistor for equivalent current resolution. | Targets notebook battery packs with system-level fuel-gauge integration; lacks UV output for low-V recovery. | Choose for SMBus-based host ecosystems where board space allows external sensing and higher cost is acceptable. |
| MAX17048 | ModelGauge™ m3 algorithm; no charge control outputs (UV/CC); 1-Wire optional (I²C primary); no integrated sense resistor. | Focused on high-accuracy SOC estimation only; requires external charger IC for full BMS functionality. | Choose when precise state-of-charge is critical but charge control is handled separately - e.g., in USB-C PD power banks. |
Compared with BQ20Z75-V160 and MAX17048, the DS2770BE+ uniquely combines integrated 25mΩ sensing, dual-chemistry charge control (UV/CC outputs), and lockable EEPROM in a single 16-pin TSSOP - reducing BOM count and enabling standalone battery-pack autonomy without host processor involvement in safety-critical decisions.
Availability
DS2770BE+ is available at Aetrix Electronics and suitable for smart power tools, portable medical devices, industrial handheld scanners, ruggedized tablets, and battery-powered test equipment requiring stable component supply and long-term lifecycle support.
Supply support for DS2770BE+ 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and automotive applications.
The DS2770BE+ belongs to Maxim's battery fuel gauge and charge controller product line, engineered specifically for autonomous, safety-certifiable battery packs in portable equipment where size, reliability, and embedded intelligence are critical.
FAQ
What battery chemistries does the DS2770BE+ support?
The DS2770BE+ supports both rechargeable lithium-ion/lithium-polymer and nickel metal hydride (NiMH) batteries. Lithium charging uses pulse-charge termination with tCD decay detection, while NiMH uses dT/dt termination with ambient-zone-adjusted thresholds. The CTYPE bit in the Status Register selects between them, and DS2770BE+ is factory-configured for 4.2V lithium charge voltage.
Does the DS2770BE+ require an external current-sense resistor?
No - the DS2770BE+ includes an integrated 25mΩ current-sense resistor, eliminating the need for an external component. This configuration provides 62.5µA LSB current resolution and ±2.048A dynamic range. The "025" suffix in DS2770BE+025 explicitly denotes the internal-sense variant, confirmed in Maxim's ordering table.
How does the DS2770BE+ communicate with the host system?
The DS2770BE+ uses the Dallas 1-Wire interface on the DQ pin, requiring only one signal line plus ground. Each device has a factory-programmed 64-bit unique ID, enabling multidrop configurations. Communication occurs at 1.8V logic levels and supports parasitic power mode, making DS2770BE+ ideal for space-constrained battery packs with minimal interconnect.
What safety features are built into the DS2770BE+?
The DS2770BE+ includes multiple hardware-enforced safety layers: undervoltage recovery (UV output), dual-termination (primary dT/dt or pulse decay + secondary 50°C max temp and programmable timer), lockable EEPROM for immutable calibration, and automatic sleep mode to limit fault exposure. All critical decisions - including charge stop and UV activation - are made autonomously by DS2770BE+ without host intervention.
Can the DS2770BE+ operate without a microcontroller host?
Yes - the DS2770BE+ functions as a standalone charge controller. It autonomously manages trickle-to-fast charge transition (via UV/CC outputs), executes termination logic, accumulates current, and maintains timers. A host is only required for parameter configuration, data readout, or advanced diagnostics; basic safety-critical operation continues even if the host is absent or unresponsive.
DS2770BE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Multi-Function Controller
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- 1-Wire
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
DS2770BE+ FAQ
1.How can I place an order for DS2770BE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2770BE+ 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 DS2770BE+ reliable?
The price and inventory of DS2770BE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2770BE+ is usually 5 days.
3.What payment methods are accepted for DS2770BE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2770BE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2770BE+?
DS2770BE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2770BE+ 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 DS2770BE+?
For technical support, including DS2770BE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2770BE+ requirements.
6.How does Aetrix verify that DS2770BE+ is sourced from the original manufacturer or authorized distributors?
All DS2770BE+ 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 DS2770BE+ meets industry standards.
7.What is the process for return or replacement of DS2770BE+?
All DS2770BE+ units undergo pre-shipment inspection (PSI). If there is an issue with DS2770BE+, 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 DS2770BE+ part is unused and in its original packaging.
Return procedure for DS2770BE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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