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Analog Devices Inc./Maxim Integrated DS2741N+T
- Part No.:
- DS2741N+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
DS2741N+T.pdf
- Description:
- IC BATT MON LI-ION 1CELL 14TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,781
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Product details
Overview
DS2741N+T from Maxim Integrated is a current monitor and accumulator IC with integrated 38mΩ sense resistor, delivering signed 10-bit bidirectional current measurement (±2.5A), 0.247mAhr LSB accumulation, I²C interface with factory-programmable 7-bit slave address (default 0x68), and operation from 2.5V to 4.5V - enabling precise battery charge control and remaining capacity estimation in portable Li-ion systems.
For engineers reviewing the DS2741N+T datasheet, DS2741N+T pinout, DS2741N+T application, or DS2741N+T equivalent, this device supports real-time current sensing, low-power sleep mode (1µA), on-chip temperature monitoring (±5°C error), and register-based accumulation for fuel-gauge algorithms in space-constrained battery packs.
Technical Context
The DS2741N+T integrates a precision 38mΩ internal sense resistor and a 10-bit signed ADC to digitize differential voltage across RS+/RS−, reporting current in two's-complement format every 22.7ms with eight-sample averaging. Its accumulator maintains net charge flow in ±8.1Ahr range using 0.247mAhr LSB resolution, updated per measurement without host intervention.
It implements an I²C-compatible serial interface supporting fast-mode (400kHz) timing, with SLP pin enabling hardware-controlled sleep mode that disables all circuitry except the reset path. The device retains accumulator state during sleep and resets only current and temperature registers upon SLP toggle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Measurement Range | ±2.5A full-scale - supports bidirectional charging/discharging detection in single-cell Li-ion applications |
| Current Accuracy | ±1% at +25°C - enables high-fidelity coulomb counting for accurate state-of-charge estimation |
| Accumulator Resolution | 0.247mAhr LSB - provides 16-bit signed accumulation precision over ±8.1Ahr range |
| I²C Interface | Fast-mode (400kHz), 7-bit slave address (factory-programmable, default 0x68) - allows multi-device bus configuration without address conflict |
| Supply Voltage | 2.5V to 4.5V - matches typical Li-ion battery voltage range and eliminates need for external LDO |
| Power Consumption | 60µA active / 1µA sleep - extends system runtime during idle periods without sacrificing measurement fidelity |
| Operating Temperature | -20°C to +70°C - qualified for consumer handheld and industrial portable equipment environments |
| Sense Resistor | Integrated 38mΩ (±18.4% tolerance at +25°C) - eliminates external component count and layout sensitivity |
Pinout & Package
DS2741N+T is housed in a 14-pin TDFN-EP package (3mm × 3mm × 0.8mm) with exposed pad for thermal enhancement. All RS+ pins (1–4) and RS− pins (11–14) must be shorted externally to ensure proper current-sense path integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 11–14 | RS+, RS− | High-side and low-side terminals of integrated 38mΩ sense resistor - require external shorting per group to maintain Kelvin sensing accuracy |
| 5 | SDA | I²C serial data line (open-drain) - requires external pull-up; supports bidirectional register access and ACK/NACK protocol |
| 6 | SCL | I²C serial clock input - synchronizes all register reads/writes and accumulator updates |
| 7 | VCC | Single power supply input (2.5V–4.5V) - powers analog front-end, ADC, accumulator logic, and I²C interface |
| 8 | DNC | Do Not Connect - no internal connection; must remain unconnected and unbonded |
| 9 | GND | Analog/digital ground reference - shared return path for sense resistor and internal circuitry |
| 10 | SLP | Active-low sleep control - forces device into 1µA standby; toggling resets current/temperature registers but preserves accumulator value |
| EP | Exposed Pad | Thermal pad (not electrically connected) - improves heat dissipation; may be left floating or grounded for EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 38mΩ Sense Resistor | Eliminates external shunt, PCB trace errors, and thermal drift sources - improves long-term measurement stability |
| Signed 10-Bit Current Measurement | Resolves ±2.5A in 2.64mA steps with two's-complement output - enables direct interpretation of charge/discharge polarity and magnitude |
| 0.247mAhr Accumulator LSB | Supports precise coulomb counting over ±8.1Ahr range - critical for battery fuel-gauge accuracy in PDAs and smartphones |
| Factory-Programmable I²C Address | Allows up to 128 devices on same bus (7-bit address space) - simplifies multi-battery pack monitoring without address collision |
| Hardware Sleep Mode (1µA) | Reduces quiescent current by >98% vs active mode - extends host MCU sleep duration without losing accumulated charge state |
| On-Chip Temperature Sensor | Measures ambient die temperature with ±5°C accuracy - enables thermal compensation of sense resistor drift in real time |
Applications
| Smartphone Battery Management | PDA Fuel Gauging |
|---|---|
|
Use Scenario: Real-time tracking of Li-ion battery charge/discharge cycles in compact handheld devices with limited board area. IC Role / Device Role / Timing Role: Primary current accumulator and coulomb counter - continuously integrates current samples every 22.7ms to update remaining capacity register. Use Value: Enables <1% SOC error over discharge cycle via integrated sense resistor calibration and temperature-compensated accumulation. |
Use Scenario: Estimating runtime and end-of-life in legacy PDA platforms requiring low-cost, minimal-footprint battery monitoring. IC Role / Device Role / Timing Role: Standalone current monitor interfacing directly to host processor via I²C - delivers signed current and accumulated charge without external ADC or firmware math. Use Value: Reduces BOM cost by eliminating discrete shunt, op-amp, and external accumulator logic while maintaining ±2% full-scale accuracy. |
| Battery Recharger Monitoring | Portable Medical Device Power Tracking |
|
Use Scenario: Verifying charge termination and detecting abnormal current draw during USB-powered battery recharging. IC Role / Device Role / Timing Role: High-accuracy current sensor feeding safety-critical charge algorithm - reports instantaneous current and cumulative charge to host controller. Use Value: Detects micro-short conditions and charger faults via 1µA sleep current and ±20mA offset specification - ensures safe charge termination. |
Use Scenario: Monitoring power consumption and battery depletion in Class II medical instruments operating under strict energy budgets. IC Role / Device Role / Timing Role: Low-power coulomb counter with guaranteed -20°C to +70°C operation - tracks net charge flow during intermittent usage patterns. Use Value: Maintains ±8.1Ahr full-scale range and 0.247mAhr resolution across temperature - supports FDA-required battery life logging without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17510 | Higher accuracy (±0.5% typ), wider voltage range (2.5V–5.5V), but no integrated sense resistor - requires external 10mΩ shunt | Preferred for high-precision industrial battery packs where layout-controlled shunt placement is feasible | Select MAX17510 when absolute current accuracy outweighs BOM simplicity and board area constraints |
| BQ27426 | Dedicated fuel gauge with impedance tracking, 32-bit accumulator, and embedded battery model - no integrated sense resistor | Targets smart battery systems requiring dynamic model-based SOC estimation beyond coulomb counting | Choose BQ27426 when advanced battery health diagnostics and adaptive learning are required, not just current integration |
Compared with DS2741N+T, MAX17510 offers superior accuracy at the cost of added external components and layout complexity, while BQ27426 shifts focus from raw current integration to model-driven fuel gauging - making DS2741N+T optimal for cost-sensitive, space-constrained designs needing self-contained coulomb counting.
Availability
DS2741N+T is available at Aetrix Electronics and suitable for smartphone battery management, PDA fuel gauging, and portable medical device power tracking requiring stable component supply and long-term lifecycle support.
Supply support for DS2741N+T 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 precision analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The DS2741N+T belongs to Maxim's battery-monitoring product line, designed specifically to simplify coulomb counting in cost-sensitive, battery-powered portable electronics with minimal external components.
FAQ
What is the factory-default I²C slave address for the DS2741N+T?
The DS2741N+T ships with a factory-programmed 7-bit I²C slave address of 0x68 (binary 0110100). This address can be customized during manufacturing to avoid bus conflicts in multi-device systems. The DS2741N+T responds only to its assigned address and ignores traffic directed to other addresses on the same I²C bus.
Does the DS2741N+T retain accumulated charge data during sleep mode?
Yes, the DS2741N+T preserves the contents of its current accumulator register (addresses 10h–11h) during sleep mode. Only the current and temperature registers are reset when the SLP pin is toggled low then high. This ensures uninterrupted coulomb counting across sleep/wake cycles, which is essential for accurate battery fuel gauging in intermittently powered devices.
How does the integrated 38mΩ sense resistor affect measurement accuracy over temperature?
The DS2741N+T internally compensates for the temperature coefficient of its 38mΩ sense resistor, achieving ±2% current-sense accuracy across -20°C to +70°C. This compensation is applied in real time during each measurement, eliminating the need for host-side correction algorithms and ensuring consistent ±2.5A full-scale performance regardless of ambient or die temperature.
Can the DS2741N+T measure current in both charge and discharge directions?
Yes, the DS2741N+T performs true bidirectional current measurement using a signed 10-bit two's-complement format. A positive value in the current register (addresses 16h–17h) indicates charging current flowing into the battery (RS+ > RS−), while a negative value indicates discharging current flowing out (RS− > RS+), enabling complete charge/discharge cycle tracking with a single device.
What is the purpose of the DNC pin (Pin 8) on the DS2741N+T?
Pin 8 of the DS2741N+T is designated DNC (Do Not Connect) and has no internal electrical connection. It must remain unconnected - neither tied to VCC, GND, nor any other signal. Bonding or routing to this pin may cause mechanical stress or unintended coupling, potentially degrading measurement accuracy or reliability of the DS2741N+T.
DS2741N+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TDFN (3x3)
DS2741N+T FAQ
1.How can I place an order for DS2741N+T through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2741N+T 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+T reliable?
The price and inventory of DS2741N+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2741N+T is usually 5 days.
3.What payment methods are accepted for DS2741N+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2741N+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2741N+T?
DS2741N+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2741N+T 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+T?
For technical support, including DS2741N+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2741N+T requirements.
6.How does Aetrix verify that DS2741N+T is sourced from the original manufacturer or authorized distributors?
All DS2741N+T 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+T meets industry standards.
7.What is the process for return or replacement of DS2741N+T?
All DS2741N+T units undergo pre-shipment inspection (PSI). If there is an issue with DS2741N+T, 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+T part is unused and in its original packaging.
Return procedure for DS2741N+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS2741N+T Tags
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