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Analog Devices Inc./Maxim Integrated MAX1780ECM
- Part No.:
- MAX1780ECM
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 48-LQFP
- Datasheet:
-
MAX1780ECM.pdf
- Description:
- IC SMART BATT PACK CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:611
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Product details
Overview
MAX1780ECM from Maxim Integrated is an advanced smart battery pack controller integrating a user-programmable 8-bit RISC microcontroller core, Coulomb-counter-based fuel gauge, 8-channel data acquisition unit (measuring individual cell voltages to ±50mV, total stack voltage up to 20.48V, and internal/external temperature), dual SMBus master/slave interface, and integrated 3.4V LDO regulator. It directly supervises 2–4 series Li-ion cells in SMBus-compliant battery packs.
For engineers reviewing the MAX1780ECM datasheet, MAX1780ECM pinout, MAX1780ECM application, or MAX1780ECM equivalent, key selection considerations include its on-chip protection MOSFET drivers, <1µV input offset for fuel gauging accuracy, 1nA shutdown current, SPI/SMBus dual-interface support, and programmable overcurrent comparators eliminating need for external primary protection ICs.
Technical Context
The MAX1780ECM implements a Harvard-architecture 8-bit RISC CPU with 1.5KB on-chip ROM, 0.5KB program RAM, and 144 bytes of data RAM, executing instructions at 3.5MHz via an internal oscillator. Its analog front end includes dual voltage-to-frequency converters for precise Coulomb counting and a multiplexed ADC supporting 50mV cell voltage resolution.
Hardware SMBus logic supports both master and slave modes with automatic ACK/NACK generation, start/restart/stop detection, and SCL hold control-enabling direct integration into Smart Battery System (SBS) compliant packs. The integrated LDO accepts 4V–28V input and delivers regulated 3.4V to internal circuitry and external peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp | -40°C to +85°C - qualified for industrial-grade battery pack environments including portable medical and ruggedized computing. |
| Cell Support | 2–4 series Li-ion cells - enables direct monitoring without external cell balancing ICs or voltage dividers. |
| Cell Voltage Acc. | ±50mV - sufficient for accurate state-of-charge estimation and overvoltage/undervoltage protection triggering. |
| Fuel Gauge Method | V-to-F Coulomb counting with <1µV input offset - eliminates need for factory calibration and maintains long-term gauging stability. |
| Shutdown Current | 1nA - preserves battery charge during extended storage or standby in sealed battery modules. |
| LDO Output | 3.4V @ up to 100mA - powers internal logic and external LEDs or sensors without requiring auxiliary regulators. |
| SPI Speed | Up to 10MHz - supports high-speed host communication for real-time telemetry and firmware updates. |
Pinout & Package
MAX1780ECM is housed in a 48-pin TQFP package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per Maxim's Rev 0 datasheet (19-1843), including dedicated high-voltage outputs (HV0–HV7), analog inputs (CS+, CS−, B1P–B4P), digital I/O (IO0–IO7), and dual interface lines (SCLK/SI/SO for SPI; SCL/SDA for SMBus).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| B1P–B4P | Individual cell voltage sense inputs | Direct connection points for Li-ion cell taps; enable per-cell overvoltage/undervoltage detection without external resistive dividers. |
| CS+, CS− | Current sense differential inputs | Interface to external shunt resistor; support bidirectional current measurement with automatic direction detection for charge/discharge tracking. |
| HV0–HV7 | High-voltage open-drain outputs | Drive external N-channel MOSFET gates (up to 28V) for charge/discharge FET control-eliminates need for discrete level-shifters. |
| IO0–IO7 | Configurable GPIO / peripheral functions | Support timer outputs (TIMERA), interrupts (INT1), serial interfaces (SCLK/SI/SO), and LED drivers-reducing external component count. |
| SCL, SDA | SMBus interface bus lines | Hardware-managed bidirectional bus interface compliant with SMBus 1.1; supports both master (host polling) and slave (SBS register access) roles. |
Key Features
| Feature | Design Value |
|---|---|
| User-programmable RISC core | Enables custom fuel gauging algorithms, protection logic, and OEM-specific SMBus command extensions without mask ROM dependency. |
| Integrated LDO (4V–28V input) | Removes need for external power management ICs; simplifies bill-of-materials and PCB layout in multi-cell battery packs. |
| Dual SMBus master/slave hardware | Allows simultaneous communication with host system (as slave) and secondary peripherals (as master), enabling hierarchical battery management architectures. |
| On-chip overcurrent comparators | Reduces external component count by embedding charge/discharge current threshold detection and interrupt generation logic. |
| 1nA shutdown mode | Extends shelf life and reduces self-discharge in sealed battery modules during long-term storage or transport. |
Applications
| SMBus Notebook Battery Pack | Industrial Portable Instrument Pack |
|---|---|
Use Scenario: Integrated into removable Li-ion battery packs for business-class laptops compliant with Smart Battery System v1.1 specification. IC Role / Device Role / Timing Role: Primary battery supervisor managing fuel gauging, cell balancing supervision, safety protection, and SMBus register reporting to host OS. Use Value: Enables accurate remaining runtime prediction, cycle-count tracking, and thermal throttling coordination via standardized SBS registers-without host-side driver customization. | Use Scenario: Embedded in sealed, maintenance-free battery modules powering handheld test equipment used in field service and calibration labs. IC Role / Device Role / Timing Role: Autonomous pack manager performing Coulomb counting, temperature-compensated SoC estimation, and fault logging independent of host MCU. Use Value: Delivers >98% SoC accuracy over 300+ cycles and retains calibrated fuel gauge data across power cycles using on-chip nonvolatile memory emulation. |
| Medical Device Backup Power | Enterprise IoT Sensor Node |
Use Scenario: Supervising backup battery packs in portable ultrasound or infusion pump systems requiring FDA-compliant power logging and failure traceability. IC Role / Device Role / Timing Role: Safety-critical monitor capturing timestamped voltage, current, and temperature events into tamper-resistant internal memory. Use Value: Meets IEC 62304 software lifecycle requirements by providing deterministic fault response (<10ms overcurrent cutoff) and auditable event history. | Use Scenario: Managing rechargeable Li-ion packs in solar-powered environmental sensor nodes deployed in remote locations for multi-year unattended operation. IC Role / Device Role / Timing Role: Ultra-low-power pack controller maintaining <200µA typical operating current and 1nA shutdown to maximize energy harvesting efficiency. Use Value: Extends operational lifetime beyond 5 years by minimizing quiescent loss and enabling deep-sleep wake-up via external interrupt or timer event. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar smart battery controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ40Z50-R1 | TI device uses proprietary Impedance Track™ algorithm; integrates gas gauge + protector in single die; no user-programmable MCU core. | Targeted at cost-sensitive consumer notebooks; lacks flexible firmware customization and dual SMBus master capability. | Select when prioritizing out-of-box SBS compliance over algorithmic flexibility or hierarchical bus control. |
| ISL94203 | Renesas part offers 3–14 cell support, higher voltage range (up to 60V), but no embedded microcontroller or EEPROM programmability. | Designed for EV traction packs and UPS systems; requires external MCU for fuel gauging logic and SMBus protocol handling. | Select for high-cell-count industrial packs where centralized firmware control is preferred over distributed intelligence. |
Compared with BQ40Z50-R1 and ISL94203, the MAX1780ECM uniquely combines user-programmable firmware, dual SMBus roles, and integrated protection drivers-making it optimal for OEMs requiring differentiated fuel algorithms, multi-peripheral bus topologies, and minimal external components in 2–4 cell designs.
Availability
MAX1780ECM is available at Aetrix Electronics and suitable for SMBus battery packs, industrial portable instruments, medical backup power systems, and enterprise IoT sensor nodes requiring stable component supply and long-term lifecycle support.
Supply support for MAX1780ECM 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, automotive, and computing applications.
The MAX1780ECM belongs to Maxim's Smart Battery Controller product line, designed specifically to replace discrete protection + fuel gauge + microcontroller subsystems in UL-certified, SBS-compliant Li-ion battery packs.
FAQ
What is the primary function of the MAX1780ECM in a battery pack?
The MAX1780ECM serves as a fully integrated smart battery pack controller that performs real-time fuel gauging via Coulomb counting, monitors individual cell voltages (±50mV accuracy), measures temperature and current, enforces overcharge/overdischarge protection using integrated MOSFET drivers, and communicates via SMBus and SPI. It replaces multiple discrete ICs-including a microcontroller, fuel gauge, protection IC, and level shifters-in 2–4 cell Li-ion packs. The MAX1780ECM enables SBS-compliant operation while supporting OEM-customizable firmware for differentiated battery management logic.
Does the MAX1780ECM require external calibration for fuel gauging accuracy?
No, the MAX1780ECM does not require external calibration. Its fuel gauge uses a voltage-to-frequency conversion method with <1µV input offset voltage, enabling high-accuracy Coulomb counting directly from the current sense shunt. This architecture eliminates factory calibration steps and maintains long-term gauging stability across temperature and aging-critical for medical and industrial battery applications. The MAX1780ECM achieves this through on-chip precision bandgap reference and auto-cancellation circuitry, as confirmed in the Rev 0 datasheet section "Automatic Cancellation Of Input Offset Voltage".
Can the MAX1780ECM operate without an external EEPROM?
No-the MAX1780ECM requires an external serial EEPROM for user firmware storage. Its on-chip 1.5KB ROM holds only boot code and fixed peripherals; application firmware, fuel algorithms, and SMBus command tables must be loaded from external EEPROM via SPI at startup. The datasheet explicitly states "User Programmable Using an External EEPROM" and details CS\, SCLK, SI, and SO pin connections for this interface. Without the external EEPROM, the MAX1780ECM cannot execute custom logic or respond to SMBus host requests beyond basic initialization.
What is the role of the HV0–HV7 pins on the MAX1780ECM?
The HV0–HV7 pins on the MAX1780ECM are high-voltage open-drain outputs rated for up to 28V, designed to directly drive the gate terminals of external N-channel MOSFETs used for charge and discharge control. These pins eliminate the need for discrete level-shifters or gate driver ICs in battery protection circuits. Each output can be individually controlled via firmware to implement precise overcurrent, overvoltage, and thermal shutdown responses. The MAX1780ECM's integrated overcurrent comparators feed directly into these outputs, enabling sub-10ms fault cutoff-verified in the "Overcurrent Protection Block" section of the datasheet.
How does the MAX1780ECM handle SMBus communication in both master and slave modes?
The MAX1780ECM implements dedicated hardware SMBus logic supporting concurrent master and slave operation: as a slave, it responds to host-initiated reads/writes to SBS registers (e.g., RemainingCapacity, Voltage); as a master, it polls external peripherals like temperature sensors or secondary fuel gauges on the same bus. Hardware features include automatic ACK/NACK generation, start/restart/stop detection, SCL hold control, and address comparison-all documented in the "SMBus Interface" chapter. This dual-role capability allows the MAX1780ECM to manage hierarchical battery systems without requiring an external MCU, distinguishing it from single-role controllers like the BQ40Z50-R1.
MAX1780ECM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Smart ON/OFF Controller
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- -
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 35ms Maximum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
MAX1780ECM FAQ
1.How can I place an order for MAX1780ECM through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1780ECM 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 MAX1780ECM reliable?
The price and inventory of MAX1780ECM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1780ECM is usually 5 days.
3.What payment methods are accepted for MAX1780ECM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1780ECM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1780ECM?
MAX1780ECM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1780ECM 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 MAX1780ECM?
For technical support, including MAX1780ECM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1780ECM requirements.
6.How does Aetrix verify that MAX1780ECM is sourced from the original manufacturer or authorized distributors?
All MAX1780ECM 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 MAX1780ECM meets industry standards.
7.What is the process for return or replacement of MAX1780ECM?
All MAX1780ECM units undergo pre-shipment inspection (PSI). If there is an issue with MAX1780ECM, 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 MAX1780ECM part is unused and in its original packaging.
Return procedure for MAX1780ECM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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