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Analog Devices Inc./Maxim Integrated MAX4944ELA+G65
- Part No.:
- MAX4944ELA+G65
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- 8-WFDFN
- Datasheet:
-
MAX4944ELA+G65.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,987
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Product details
Overview
The MAX4944ELA+G65 from Maxim Integrated is an overvoltage-protection controller with integrated nFET switch, designed for input voltage rail protection in portable power systems. It features 6.35V (typ) overvoltage lockout (OVLO), 4.15V (typ) undervoltage lockout (UVLO), 80mΩ (typ) RON, 1.2A (min) current-limit protection, and autoretry fault recovery - used in USB-powered devices to prevent damage from faulty adapters.
For engineers reviewing the MAX4944ELA+G65 datasheet, MAX4944ELA+G65 pinout, MAX4944ELA+G65 application, or MAX4944ELA+G65 equivalent, key selection criteria include OVLO/UVLO thresholds, autoretry timing (15ms typ), ACOK logic output behavior, thermal shutdown at +175°C, and compatibility with external pFET reverse-polarity protection down to -28V.
Technical Context
The MAX4944ELA+G65 integrates a charge-pump–driven nFET switch with internal 15ms debounce timer and 30ms ACOK assertion delay. Its UVLO and OVLO comparators operate independently to enable/disable the charge pump, ensuring the switch only turns on when VIN is strictly between 4.15V and 6.35V.
During overcurrent events, it enters autoretry mode: the switch turns off within 10µs, waits 15ms (typ), then attempts re-enabling. The open-drain ACOK output asserts low only after stable voltage is confirmed for 30ms, and deasserts immediately upon UVLO/OVLO violation or thermal fault.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVLO Threshold | 6.35V (typ); precise trip point prevents system damage from adapter overvoltage above safe USB-5V tolerance |
| UVLO Threshold | 4.15V (typ); ensures clean startup only when input exceeds minimum valid USB supply level |
| RON | 80mΩ (typ) at 1A; minimizes forward-voltage drop and power loss in high-current portable rails |
| Current Limit | 1.2A (min); protects downstream circuitry during short-circuit faults without external sensing |
| ACOK Assertion Delay | 30ms (typ); provides reliable power-good indication after stable regulation is achieved |
| Autoretry Time | 15ms (typ); enables automatic recovery from transient overloads while limiting average fault power |
| Thermal Shutdown | +175°C (typ); disables switch before junction temperature risks permanent silicon degradation |
Pinout & Package
MAX4944ELA+G65 is housed in an 8-pin µDFN package (2mm × 2mm, 0.5mm pitch), optimized for space-constrained portable designs. Pin 1–2 and 6–8 are internally bonded for high-current IN/OUT routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 IN | Voltage Input | Powers internal charge pump; requires 1µF ceramic bypass for ±15kV HBM ESD protection |
| 3 GP | pFET Gate-Drive Output | Drives external p-channel MOSFET for reverse-polarity protection down to -28V |
| 4 ACOK | Active-Low Open-Drain Indicator | Signals valid input range (4.15V–6.35V) after 30ms stabilization; requires external pullup |
| 5 GND | Ground Reference | Common return path for all internal circuits and external bypass capacitors |
| 6, 7, 8 OUT | Switch Output | Delivers protected output voltage; pins shorted internally for low-inductance, high-current path |
Key Features
| Feature | Design Value |
|---|---|
| Integrated nFET Switch | Eliminates need for discrete high-side switch and gate-driver IC in compact USB power paths |
| Autoretry Fault Recovery | Enables self-healing operation during intermittent shorts without host MCU intervention |
| Programmable UVLO/OVLO | Fixed 4.15V/6.35V thresholds match standard USB adapter tolerances and prevent brownout operation |
| ACOK Power-Good Logic | Provides deterministic, debounced system-ready signal to microcontroller reset or enable logic |
| Reverse Polarity Support | GP output drives external pFET to block -28V faults - critical for hot-plug and miswired adapter scenarios |
Applications
| USB Adapter Protection | Portable Device Power Sequencing |
|---|---|
Use Scenario: Preventing damage from counterfeit or malfunctioning 5V USB wall adapters delivering >6.35V. IC Role / Device Role / Timing Role: Overvoltage-protection controller that disables power delivery within 20µs of OVLO violation. Use Value: Ensures system reliability without requiring redesign of DC-DC converter input stage or adding external TVS diodes. | Use Scenario: Enabling orderly power-up of baseband processor and PMIC in smartphones after stable USB input is confirmed. IC Role / Device Role / Timing Role: Generates ACOK signal only after 30ms stable voltage window, synchronizing downstream enable sequencing. Use Value: Eliminates boot failures caused by premature enable signals during adapter plug-in transients. |
| Digital Camera Battery Charging | MP3 Player Adapter Interface |
Use Scenario: Safeguarding Li-ion battery charger ICs from overvoltage during AC adapter connection in digital still cameras. IC Role / Device Role / Timing Role: Acts as front-end protector with 1.2A current limit and autoretry to handle inrush into large input caps. Use Value: Prevents latch-up or thermal runaway in charger ICs during repeated hot-plug cycles. | Use Scenario: Isolating audio codec and flash memory from unstable or reversed-polarity USB power sources in MP3 players. IC Role / Device Role / Timing Role: Provides reverse-polarity blocking via GP-driven pFET and fast turn-off (<10µs) during overcurrent. Use Value: Enables robust field operation without mechanical polarity enforcement on mini-USB connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage-protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4944BELA+T | Latchoff (not autoretry) overcurrent response; same OVLO/UVLO thresholds | Suitable where persistent fault isolation is required instead of automatic recovery | Select when system safety mandates manual reset after overcurrent event |
| MAX4945ELA+T | 5.80V (typ) OVLO; 4.15V UVLO; otherwise identical pinout, package, and timing | Better suited for systems powered from regulated 5V supplies with tighter overvoltage margin | Choose when protecting against 5.5V max rails rather than nominal 5V USB adapters |
Compared with MAX4944ELA+G65, MAX4944BELA+T eliminates autoretry for fail-safe lockout, while MAX4945ELA+T lowers OVLO to 5.80V for stricter 5V-system compliance - both retain identical µDFN-8 packaging and ACOK timing, enabling layout reuse with threshold-only validation.
Availability
MAX4944ELA+G65 is available at Aetrix Electronics and suitable for USB adapter protection, portable device power sequencing, and digital camera battery charging requiring stable component supply across industrial temperature ranges.
Supply support for MAX4944ELA+G65 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, communications, and consumer applications.
The MAX4943–MAX4946/MAX4949 family was developed specifically for robust front-end protection of low-voltage portable electronics against adapter overvoltage, reverse polarity, and short-circuit faults.
FAQ
What is the overvoltage lockout (OVLO) threshold for MAX4944ELA+G65?
The MAX4944ELA+G65 has a fixed overvoltage lockout threshold of 6.35V (typical), with a guaranteed range of 6.00V to 6.70V across -40°C to +85°C. This value is factory-trimmed and does not require external configuration. The MAX4944ELA+G65 uses this threshold to disable its internal nFET switch instantly if input voltage exceeds 6.35V, protecting downstream components such as USB interface ICs or battery chargers.
Does MAX4944ELA+G65 support reverse-polarity protection?
Yes, the MAX4944ELA+G65 supports reverse-polarity protection via its GP (gate-drive output) pin, which drives an external p-channel MOSFET. When input voltage drops below ground, GP pulls low to turn off the pFET, blocking reverse current down to -28V. This function requires no additional control logic and operates autonomously alongside the internal overvoltage and overcurrent protections built into the MAX4944ELA+G65.
How does the ACOK output behave during power-up and fault conditions for MAX4944ELA+G65?
The ACOK output of the MAX4944ELA+G65 is an active-low, open-drain signal that asserts low only after VIN remains within the valid window (4.15V to 6.35V) for 30ms (typical). During power-up, ACOK stays high-impedance until that window is satisfied. If VIN falls below UVLO or rises above OVLO - or during overcurrent/thermal fault - ACOK immediately goes high-impedance. This behavior is intrinsic to the MAX4944ELA+G65's internal state machine and requires only an external pullup resistor to the host I/O voltage.
What is the current-limit threshold and response time of MAX4944ELA+G65 during a short circuit?
The MAX4944ELA+G65 provides 1.2A (minimum) current-limit protection, triggering within 10µs (typical) of exceeding the threshold. Upon detection, the internal nFET switch turns off completely, and - because MAX4944ELA+G65 is an autoretry variant - initiates a 15ms (typical) retry cycle. This fast response prevents thermal damage to PCB traces and downstream ICs, and the autoretry allows recovery from transient loads without manual intervention, a core functional distinction of the MAX4944ELA+G65 within its family.
Is MAX4944ELA+G65 compatible with the same PCB footprint as other devices in the MAX4943–MAX4946 family?
Yes, the MAX4944ELA+G65 uses the identical 8-pin µDFN package (L822-1, 2mm × 2mm) and pinout as all members of the MAX4943–MAX4946/MAX4949 family, including MAX4943ELA+T, MAX4945ELA+T, and MAX4946ELA+T. This allows direct substitution on existing layouts when changing OVLO/UVLO thresholds or fault-response modes - provided the application's electrical requirements (e.g., 6.35V OVLO, autoretry) align with the MAX4944ELA+G65's specifications.
MAX4944ELA+G65 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Overvoltage Protection Controller
- Current - Supply:
- 50µA
- Voltage - Supply:
- 2.2V ~ 28V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µDFN (2x2)
MAX4944ELA+G65 FAQ
1.How can I place an order for MAX4944ELA+G65 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4944ELA+G65 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 MAX4944ELA+G65 reliable?
The price and inventory of MAX4944ELA+G65 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4944ELA+G65 is usually 5 days.
3.What payment methods are accepted for MAX4944ELA+G65?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4944ELA+G65 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4944ELA+G65?
MAX4944ELA+G65 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4944ELA+G65 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 MAX4944ELA+G65?
For technical support, including MAX4944ELA+G65 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4944ELA+G65 requirements.
6.How does Aetrix verify that MAX4944ELA+G65 is sourced from the original manufacturer or authorized distributors?
All MAX4944ELA+G65 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 MAX4944ELA+G65 meets industry standards.
7.What is the process for return or replacement of MAX4944ELA+G65?
All MAX4944ELA+G65 units undergo pre-shipment inspection (PSI). If there is an issue with MAX4944ELA+G65, 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 MAX4944ELA+G65 part is unused and in its original packaging.
Return procedure for MAX4944ELA+G65:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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