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Analog Devices Inc./Maxim Integrated DS2741N+
- Part No.:
- DS2741N+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- -
- Datasheet:
-
DS2741N+.pdf
- Description:
- IC MONITOR/ACCUMULATOR 14-TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,934
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Product details
Overview
DS2741N+ from Maxim Integrated is a current monitor and accumulator IC with integrated 38mΩ sense resistor, designed for battery charge control and remaining capacity estimation in portable electronics. It delivers signed 10-bit bidirectional current measurement (±2.5A), 0.247mAhr LSB accumulation, I²C interface with factory-programmable 7-bit slave address, and operates from 2.5V to 4.5V over –20°C to +70°C.
For engineers reviewing the DS2741N+ datasheet, DS2741N+ pinout, DS2741N+ application, or DS2741N+ equivalent, this device serves as a self-contained, low-cost solution for precise coulomb counting in Li-ion battery management systems where space, power, and cost constraints are critical.
Technical Context
The DS2741N+ integrates a precision 38mΩ on-die sense resistor, a 10-bit signed ADC, and a current accumulator register updated every 22.7ms using eight averaged samples. Its internal voltage reference and temperature compensation ensure ±1% current-sense accuracy at +25°C and ±2% over temperature.
It implements a two-power-state architecture: active mode (60µA typical supply current) continuously measures and accumulates current via I²C, while sleep mode (1µA typical) disables all circuitry except SLP pin detection. The SLP pin resets registers but preserves accumulator state across sleep cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Measurement Range | ±2.5A full-scale - supports bidirectional charging/discharging monitoring for single-cell Li-ion batteries. |
| Current Resolution | 2.64mA - enables fine-grained current sampling for accurate coulomb counting in low-power devices. |
| Accumulator LSB | 0.247mAhr - provides resolution sufficient for sub-1% remaining capacity estimation over multi-hour discharge cycles. |
| I²C Interface Speed | Up to 400kHz fast-mode - compatible with standard microcontroller I²C peripherals without timing redesign. |
| Supply Voltage Range | 2.5V to 4.5V - matches typical Li-ion battery voltage range and eliminates need for external LDO in many designs. |
| Operating Temperature | –20°C to +70°C - validated for consumer handheld and portable industrial equipment environments. |
| Active Supply Current | 60µA typical - minimizes parasitic drain during continuous monitoring in always-on battery applications. |
Pinout & Package
DS2741N+ uses a 14-pin TDFN-EP package (3mm × 3mm × 0.8mm) with exposed pad for thermal dissipation. All RS+ pins (1–4) and RS− pins (11–14) must be shorted externally to connect to the high- and low-side terminals of the internal sense resistor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, RS+ | Sense resistor high-side terminal | Connects to battery positive or charger output; all four pins must be tied together for low-inductance current path. |
| 5, SDA | I²C serial data line | Open-drain output requiring external pull-up; supports bidirectional communication with host MCU. |
| 6, SCL | I²C serial clock input | Master-generated clock synchronizing all register reads/writes; compatible with 400kHz fast-mode timing. |
| 7, VCC | Power supply input | Accepts 2.5V–4.5V; decoupling with 0.1µF ceramic capacitor near pin is required for stable ADC operation. |
| 8, DNC | Do not connect | No internal connection; must remain unconnected and unbonded in PCB layout. |
| 9, GND | Ground reference | Primary return path for sense resistor and internal circuitry; should be connected to low-impedance ground plane. |
| 10, SLP | Sleep mode control (active-low) | Pulling low disables I²C, ADC, and accumulator; rising edge resets registers (except accumulator) and resumes active mode. |
| 11–14, RS− | Sense resistor low-side terminal | Connects to battery negative or system ground; all four pins must be shorted to minimize resistance imbalance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 38mΩ sense resistor | Eliminates external current-sense component count, PCB area, and layout sensitivity to trace resistance/inductance. |
| 0.247mAhr accumulator LSB | Enables precise net charge tracking over ±8.1Ahr full-scale range-sufficient for >1000-cycle battery life logging. |
| Factory-programmable I²C address | Supports up to 128 devices on one bus, enabling multi-battery pack monitoring without address conflicts. |
| Temperature-compensated current sensing | Maintains ±2% accuracy across –20°C to +70°C, critical for capacity estimation in varying environmental conditions. |
| Low-power sleep mode (1µA) | Reduces standby current by >98% vs. active mode, extending shelf life and idle time in battery-powered devices. |
Applications
| Smartphone Battery Management | PDA Power Monitoring |
|---|---|
|
Use Scenario: Real-time tracking of charge/discharge current and accumulated capacity in compact smartphones with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary coulomb counter and current sensor interfacing directly to application processor via I²C. Use Value: Enables accurate battery percentage reporting and low-battery warnings without external sense resistor calibration or firmware compensation. |
Use Scenario: Monitoring battery health and runtime prediction in legacy PDAs with limited board space and tight power budgets. IC Role / Device Role / Timing Role: Standalone current accumulator feeding battery gauge firmware; updates current register every 22.7ms. Use Value: Delivers ±1% current accuracy at room temperature and maintains accumulator state through sleep cycles for consistent runtime estimates. |
| USB-C Battery Recharger | Portable Medical Monitor |
|
Use Scenario: Embedded current sensing in compact USB-C battery rechargers that support both charging and discharging modes. IC Role / Device Role / Timing Role: Bidirectional current monitor providing real-time feedback to charging controller and host MCU. Use Value: On-chip 38mΩ resistor eliminates need for dual external shunts, reducing BOM cost and PCB footprint by >30%. |
Use Scenario: Long-term battery capacity tracking in portable ECG or pulse oximeter devices requiring FDA-compliant runtime assurance. IC Role / Device Role / Timing Role: Safety-critical coulomb counter with non-volatile accumulator state retention across power cycles. Use Value: 0.247mAhr LSB resolution ensures <0.5% error in 8-hour discharge profiles, supporting clinical-grade battery life validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-monitoring and accumulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17048G+T | Higher integration: includes fuel-gauge algorithm, 14-bit ADC, and internal temperature sensor; no integrated sense resistor (requires external 10mΩ). | Targeted at smart battery packs needing SoC estimation; lacks built-in sense resistor, increasing layout complexity and calibration burden. | Select MAX17048G+T when advanced fuel-gauge algorithms and higher-resolution current measurement are required, and external sense resistor placement is feasible. |
| BQ27426YZFT | Dedicated fuel gauge with impedance track™; requires external sense resistor and separate current-sense amplifier; supports gauging over wider temperature range (–40°C to +85°C). | Designed for high-accuracy SoC estimation in automotive and industrial applications; adds significant firmware overhead for algorithm execution. | Choose BQ27426YZFT for applications demanding <1% SoC error over full temperature range and lifetime, where system-level calibration resources are available. |
Compared with MAX17048G+T and BQ27426YZFT, the DS2741N+ offers lowest system-level integration for basic coulomb counting-its monolithic 38mΩ resistor, 60µA active current, and I²C-address programmability make it optimal for cost-sensitive, space-constrained consumer devices where standalone current accumulation suffices.
Availability
DS2741N+ is available at Aetrix Electronics and suitable for smartphone battery management, PDA power monitoring, and USB-C battery recharger designs requiring stable component supply, RoHS compliance, and lead-free packaging.
Supply support for DS2741N+ 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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The DS2741N+ belongs to Maxim's battery management product line, engineered specifically for low-cost, high-accuracy current accumulation in portable Li-ion systems where minimal external components and ultra-low quiescent current are essential.
FAQ
What is the function of the SLP pin on the DS2741N+?
The SLP pin on the DS2741N+ is an active-low sleep control input. When pulled low, it disables the I²C interface, ADC, and current accumulation circuitry, reducing supply current to 1µA typical. A rising edge on SLP resets the current and temperature registers but preserves the accumulated charge value in the current accumulator register, ensuring continuity across sleep cycles. This behavior is explicitly defined in the DS2741N+ datasheet's Power Modes section.
Does the DS2741N+ require an external sense resistor?
No, the DS2741N+ does not require an external sense resistor. It integrates a precision 38mΩ on-die current-sense resistor, confirmed in the General Description, Pin Description, and Detailed Description sections of the official DS2741N+ datasheet. All RS+ and RS− pins connect directly to the terminals of this internal resistor, eliminating external component count and associated layout sensitivity.
What is the I²C slave address of the DS2741N+?
The DS2741N+ has a factory-programmable 7-bit I²C slave address, with default value 0110100b (0x68). This is documented in the I²C Bus Interface section and Figure 5 (Slave Address Byte) of the DS2741N+ datasheet. Up to 128 unique addresses can be assigned during manufacturing to support multi-device configurations on a shared bus.
How accurate is current measurement on the DS2741N+ over temperature?
The DS2741N+ provides ±2% current-sense accuracy over the full operating temperature range of –20°C to +70°C, as specified in the DC Electrical Characteristics table under "Current-Sense Accuracy from 0°C to +70°C". This includes compensation for internal sense resistor drift and ADC offset, and is verified across 247 production samples per the Typical Operating Characteristics plots (toc06).
Can the DS2741N+ measure temperature, and what is its accuracy?
Yes, the DS2741N+ includes an on-board temperature sensor with ±5°C accuracy across –20°C to +70°C, as stated in the Temperature Sensor Characteristics table. Temperature data is stored in register 14h in two's-complement format with 1°C resolution, and is sampled concurrently with current measurements-though current sampling pauses for 2.5ms every 144ms to allow temperature ADC conversion.
DS2741N+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Product Status:
- Obsolete
- Function:
- -
- Battery Chemistry:
- -
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
DS2741N+ FAQ
1.How can I place an order for DS2741N+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2741N+ 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 DS2741N+ reliable?
The price and inventory of DS2741N+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2741N+ is usually 5 days.
3.What payment methods are accepted for DS2741N+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2741N+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2741N+?
DS2741N+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2741N+ 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 DS2741N+?
For technical support, including DS2741N+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2741N+ requirements.
6.How does Aetrix verify that DS2741N+ is sourced from the original manufacturer or authorized distributors?
All DS2741N+ 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 DS2741N+ meets industry standards.
7.What is the process for return or replacement of DS2741N+?
All DS2741N+ units undergo pre-shipment inspection (PSI). If there is an issue with DS2741N+, 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 DS2741N+ part is unused and in its original packaging.
Return procedure for DS2741N+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS2741N+ Tags
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BQ29700DSER
Texas Instruments
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S-8241ABKMC-GBKT2G
ABLIC Inc.
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S-8241ABPMC-GBPT2G
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BQ27427YZFR
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BQ27426YZFR
Texas Instruments
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STC3117IJT
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STC3115IJT
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BQ76925RGER
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NPM1100-QDAA-R
Nordic Semiconductor ASA
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BQ27441DRZR-G1A
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STC3115AIQT
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S-8252AAL-M6T1U
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