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Analog Devices Inc./Maxim Integrated MAX4981ETA+T
- Part No.:
- MAX4981ETA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Supply Controllers, Monitors
- Package:
- -
- Datasheet:
-
MAX4981ETA+T.pdf
- Description:
- IC OVERVOLTAGE PROT CTRLR 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,628
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Product details
Overview
The MAX4981ETA+T from Maxim Integrated is an overvoltage- and overcurrent-protected n-channel MOSFET switch for lithium-ion battery charger input protection, featuring 5.7V overvoltage lockout (OVLO), 2.63V undervoltage lockout (UVLO), 1.95A current-limit threshold, 85mΩ typical RON, and integrated battery overcharge protection at 4.4V - deployed in portable devices such as smartphones and digital cameras to safeguard against adapter faults and battery overcharge.
For engineers reviewing the MAX4981ETA+T datasheet, MAX4981ETA+T pinout, MAX4981ETA+T application, or MAX4981ETA+T equivalent, key selection criteria include its 8-pin TDFN package, active current limiting with 20ms blanking time, thermal shutdown at 160°C, battery voltage monitoring on BAT pin, and compatibility with 5V AC adapters requiring ±15kV HBM ESD protection on IN/BAT.
Technical Context
The MAX4981ETA+T integrates a charge-pump–driven nFET switch with dual-voltage comparators (OVLO/UVLO), a precision current-sense amplifier for overcurrent limiting, and a dedicated battery voltage monitor comparator. Its control logic implements autoretry behavior with 20ms blanking and 160ms retry intervals upon current-limit violation.
It operates across -40°C to +85°C, uses internal bandgap reference for voltage thresholds, and features open-drain SDT signaling only on MAX4978/MAX4979 - absent on MAX4981ETA+T. The BAT pin enables direct Li-ion cell voltage monitoring, disabling the FET when VBAT ≥ 4.4V (typ), with 1% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Lockout (OVLO) | 5.7V (typ); disables FET if input exceeds safe adapter range, preventing downstream IC damage |
| Undervoltage Lockout (UVLO) | 2.63V (typ); prevents operation under weak/low-capacity power sources, avoiding brownout instability |
| Current-Limit Threshold | 1.95A (typ); clamps load current during short-circuit or overload, with 20ms blanking before fault response |
| Battery Overvoltage Trip | 4.4V (typ); shuts off FET when Li-ion cell reaches full charge, eliminating risk of overcharge |
| Switch On-Resistance | 85mΩ (typ at +25°C); minimizes conduction loss and self-heating under 1.95A continuous load |
| Thermal Shutdown | 160°C (typ); protects device from thermal runaway during sustained overload or poor PCB heatsinking |
| Input Voltage Range | 2.3V to 28V; supports wide-input USB/AC-DC adapters while surviving transient surges up to +28V |
Pinout & Package
MAX4981ETA+T is housed in an 8-pin TDFN-EP (2mm × 3mm) package with exposed pad (EP) connected internally to GND. Thermal performance is optimized by soldering EP to a large PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Supply Input | Accepts 2.3V–28V adapter input; powers internal charge pump; requires 1µF ceramic bypass for ±15kV HBM ESD protection |
| 2 - | No Connect (NC) | Pin 2 is unassigned on MAX4981ETA+T (used as SDT on MAX4978/MAX4979 only) |
| 3,6,7 I.C. | Internally Connected | Must be tied to GND; internal connection point for bias circuitry and substrate reference |
| 4 EN | Enable Input | Active-low control: drive low for normal operation; high disables FET and reduces supply current to 23µA |
| 5 GND | Ground Reference | Main signal and power return; connects to EP for thermal and electrical integrity |
| 8 OUT | Switched Output | Drives protected system load; sourced through internal 85mΩ nFET; rated for ≤28V output swing |
| - BAT | Battery Monitor Input | Direct connection to Li-ion cell anode; triggers FET shutdown at 4.4V to prevent overcharge |
Key Features
| Feature | Design Value |
|---|---|
| Lithium-ion battery overcharge protection | Integrated 4.4V BAT comparator disables FET autonomously - eliminates need for external voltage supervisor |
| Active current limiting with autoretry | 1.95A threshold + 20ms blanking + 160ms retry cycle enables self-recovering fault handling without host intervention |
| Robust input fault tolerance | Withstands +28V transients and meets ±15kV HBM ESD (with 1µF IN/BAT bypass) - suitable for unregulated wall adapters |
| Precision dual-voltage protection | 5.7V OVLO and 2.63V UVLO thresholds with <1% hysteresis ensure stable switching across temperature (-40°C to +85°C) |
| Low-conduction-loss switching | 85mΩ RON (typ) limits I²R loss to <330mW at 1.95A - reduces thermal stress in space-constrained portable PCBs |
Applications
| Smartphone Charger Port Protection | Digital Camera Power Input Guard |
|---|---|
|
Use Scenario: Protects main PMIC and battery charging circuitry from faulty 5V USB adapters delivering >5.7V or collapsing below 2.63V. IC Role / Device Role / Timing Role: Primary input protection switch placed between USB connector and system power rail; asserts fast turn-off (<15µs) on OVLO/UVLO events. Use Value: Prevents permanent damage to sensitive 1.8V/3.3V system rails and avoids unsafe battery charging conditions due to adapter malfunction. |
Use Scenario: Secures power path in compact digital still cameras using single-cell Li-ion batteries and universal AC adapters. IC Role / Device Role / Timing Role: Acts as intelligent gate between adapter and charging IC; monitors BAT voltage in real time to halt charging at 4.4V. Use Value: Eliminates need for discrete voltage supervisor and current-sense resistor, reducing BOM count and PCB area by >30%. |
| Portable Media Player Input Conditioning | Tablet USB-C Power Negotiation Backup |
|
Use Scenario: Ensures reliable operation of MP3 players subjected to variable-quality third-party chargers with poor regulation. IC Role / Device Role / Timing Role: Standalone overvoltage/overcurrent protector upstream of DC-DC converters; provides 160ms startup debounce to suppress inrush false triggers. Use Value: Guarantees clean power-up sequence and prevents latch-up during hot-plug events with capacitive adapters. |
Use Scenario: Serves as hardware-level fallback protection when USB-C PD negotiation fails or delivers out-of-spec voltage. IC Role / Device Role / Timing Role: Secondary protection layer behind PD controller; reacts independently to >5.7V input or >1.95A current regardless of communication status. Use Value: Maintains system safety even if firmware or PD protocol stack becomes unresponsive - critical for UL/IEC62368 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage- and overcurrent-protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4980ETA+ | Same 8-pin TDFN package, identical OVLO/UVLO/BAT thresholds, but 0.9A current limit (vs. 1.95A) | Targeted at lower-power devices (e.g., Bluetooth headsets); insufficient for 1.5A+ charging paths | Select MAX4980ETA+ only when system peak current remains ≤900mA and thermal budget is tighter |
| TPD3S014RTER | USB-optimized 4-channel protector; lacks BAT monitoring and fixed 5.7V OVLO; offers 1.5A current limit | Designed for USB data + power line protection; no Li-ion battery overcharge function | Choose TPD3S014RTER for USB-centric designs needing ESD + OVP combo, but not battery-aware protection |
Compared with MAX4980ETA+ and TPD3S014RTER, the MAX4981ETA+T uniquely combines high-current (1.95A) active limiting, precise 4.4V battery overvoltage cutoff, and robust 28V fault tolerance in a single 2mm × 3mm footprint - making it optimal for modern smartphone and tablet charger ports where both adapter reliability and battery safety are non-negotiable.
Availability
MAX4981ETA+T is available at Aetrix Electronics and suitable for smartphone charger port protection, digital camera power input guard, and portable media player input conditioning requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX4981ETA+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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and portable applications.
The MAX4978–MAX4981 family was developed specifically for USB/AC-DC adapter input protection in Li-ion–powered portable electronics, integrating fault detection, current limiting, and battery safety into one monolithic solution.
FAQ
What is the overvoltage lockout threshold for MAX4981ETA+T?
The MAX4981ETA+T has a fixed overvoltage lockout (OVLO) threshold of 5.7V (typical), with ±0.1V variation over temperature. When the IN voltage exceeds this level, the internal nFET switches off within 15µs to protect downstream circuitry. This value is factory-trimmed and does not require external configuration - a key differentiator from adjustable OVP ICs.
Does MAX4981ETA+T provide battery overcharge protection?
Yes, the MAX4981ETA+T includes dedicated battery overcharge protection via its BAT pin. It continuously monitors the connected Li-ion cell voltage and disables the output FET when VBAT reaches 4.4V (typical), with 1% hysteresis. This function is intrinsic to the MAX4981ETA+T and is not present in MAX4978/MAX4979 variants.
What is the current-limit threshold and response behavior of MAX4981ETA+T?
The MAX4981ETA+T limits output current to 1.95A (typical) with a 20ms blanking window after overcurrent detection. If the condition persists beyond blanking, the FET turns off for 160ms (autoretry interval) before attempting recovery. This behavior is fully autonomous - no host processor or external timer is required for fault management.
Is the SDT pin available on MAX4981ETA+T?
No, the SDT (Startup Debounce Time Indicator) pin is not implemented on the MAX4981ETA+T. Pin 2 is unassigned (NC) in this variant. SDT functionality is exclusive to MAX4978ETA+ and MAX4979ETA+, where it provides an active-low open-drain signal during debounce and autoretry cycles.
What package type and thermal characteristics does MAX4981ETA+T use?
The MAX4981ETA+T uses an 8-pin TDFN-EP package (2mm × 3mm) with exposed pad connected to GND. Its junction-to-ambient thermal resistance (θJA) is 60°C/W, and junction-to-case (θJC) is 10.8°C/W. For reliable operation at 1.95A, the EP must be soldered to a minimum 100mm² copper pour on the PCB's ground plane.
MAX4981ETA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Strip
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- -
- Voltage - Input:
- -
- Voltage - Supply:
- -
- Current - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX4981ETA+T FAQ
1.How can I place an order for MAX4981ETA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4981ETA+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 MAX4981ETA+T reliable?
The price and inventory of MAX4981ETA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4981ETA+T is usually 5 days.
3.What payment methods are accepted for MAX4981ETA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4981ETA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4981ETA+T?
MAX4981ETA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4981ETA+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 MAX4981ETA+T?
For technical support, including MAX4981ETA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4981ETA+T requirements.
6.How does Aetrix verify that MAX4981ETA+T is sourced from the original manufacturer or authorized distributors?
All MAX4981ETA+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 MAX4981ETA+T meets industry standards.
7.What is the process for return or replacement of MAX4981ETA+T?
All MAX4981ETA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4981ETA+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 MAX4981ETA+T part is unused and in its original packaging.
Return procedure for MAX4981ETA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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