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Analog Devices Inc./Maxim Integrated MAX4944LELA+TG65
- Part No.:
- MAX4944LELA+TG65
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- 8-WFDFN
- Datasheet:
-
MAX4944LELA+TG65.pdf
- Description:
- OVERVOLTAGE-PROTECTION CONTROLLE
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
The MAX4944LELA+TG65 from Maxim Integrated is an overvoltage-protection controller with integrated nFET switch, designed for input voltage supervision in portable power rails. It features a 6.35V (typ) overvoltage lockout (OVLO), 2.45V (typ) undervoltage lockout (UVLO), 80mΩ (typ) RON, 1.2A (min) current-limit protection, and autoretry fault recovery - used to safeguard USB-powered peripherals, battery chargers, and DC-DC input stages against +28V faults.
For engineers reviewing the MAX4944LELA+TG65 datasheet, MAX4944LELA+TG65 pinout, MAX4944LELA+TG65 application, or MAX4944LELA+TG65 equivalent, key selection criteria include UVLO threshold compatibility (2.45V), OVLO precision (6.35V), autoretry timing (15ms), thermal shutdown (+175°C), and µDFN package footprint constraints for space-constrained handheld designs.
Technical Context
The MAX4944LELA+TG65 integrates a charge-pump–driven nFET switch with internal 15ms debounce startup and 30ms ACOK assertion delay. Its UVLO threshold is fixed at 2.45V (typ), enabling operation down to low-voltage adapters, while OVLO is precisely trimmed to 6.35V (typ) to protect 5V logic rails from overvoltage transients.
It implements autoretry overcurrent response with 10µs fault turn-off and 15ms retry interval, and includes GP pin control for external pFET reverse-polarity protection down to –28V. Thermal shutdown activates at +175°C (typ) with 40°C hysteresis, and ACOK provides open-drain power-good signaling after stable voltage window validation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Threshold (OVLO) | 6.35V (typ); precise trip point for protecting 5V systems from adapter overvoltage |
| Undervoltage Threshold (UVLO) | 2.45V (typ); enables reliable start-up from low-voltage sources such as depleted batteries or weak adapters |
| Switch RON | 80mΩ (typ) at 1A; minimizes conduction loss and thermal rise in high-current paths |
| Current-Limit Threshold | 1.2A (min); ensures robust short-circuit protection without nuisance tripping under peak load |
| Autoretry Time | 15ms (typ); balances fault clearing speed with safe power dissipation during repeated faults |
| ACOK Assertion Delay | 30ms (typ); guarantees stable input voltage before asserting power-good to downstream logic |
| Thermal Shutdown | +175°C (typ); prevents permanent damage during sustained overload or poor PCB thermal design |
Pinout & Package
MAX4944LELA+TG65 is housed in an 8-pin µDFN package (2mm × 2mm, 0.5mm pitch), optimized for compact portable applications. Pin 1–2 and 6–8 are internally bonded to IN and OUT respectively for low-inductance current paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | IN | Voltage input; powers internal charge pump and must be bypassed with 1µF ceramic capacitor for ±15kV HBM ESD protection |
| 3 | GP | pFET gate-drive output; pulls external pFET gate low when IN > GND to enable reverse-polarity protection |
| 4 | ACOK | Active-low open-drain adapter-voltage indicator; asserts low only after 30ms stable VIN within UVLO/OVLO window |
| 5 | GND | Ground reference for all internal circuitry and charge pump return path |
| 6, 7, 8 | OUT | Switch output; shorted together internally to maximize current handling and minimize trace inductance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated nFET switch | 80mΩ (typ) RON eliminates need for external MOSFET and reduces BOM count in adapter-input protection circuits |
| Preset UVLO/OVLO thresholds | 2.45V/6.35V (typ) thresholds match common Li-ion charger and USB OTG input requirements without external resistors |
| Autoretry overcurrent response | 15ms (typ) retry time limits average power dissipation during persistent shorts, avoiding thermal runaway |
| GP-driven reverse polarity protection | Enables use of external pFET to block –28V faults - critical for hot-plug USB accessories and docking stations |
| ACOK power-good signaling | Open-drain output simplifies interface to microcontroller GPIO or PMIC enable inputs without level-shifting |
Applications
| USB Power Input Protection | Li-ion Charger Input Supervision |
|---|---|
|
Use Scenario: USB-powered portable devices (e.g., Bluetooth headsets, smartwatches) exposed to non-compliant wall adapters or automotive USB ports. IC Role / Device Role / Timing Role: Primary overvoltage supervisor placed between USB connector and DC-DC converter input. Use Value: Prevents damage from +28V adapter faults while enabling fast 6ms switch turn-on and 30ms ACOK assertion for deterministic system boot sequencing. |
Use Scenario: Single-cell Li-ion charging circuits where input voltage must remain within safe range for linear or switching charger ICs. IC Role / Device Role / Timing Role: Input rail guard that disables charging path if adapter exceeds 6.35V or drops below 2.45V. Use Value: Eliminates risk of overcharging or charger latch-up due to unstable input, using factory-trimmed thresholds with <1% hysteresis. |
| Portable Media Player Power Management | Industrial Handheld Terminal Adapter Interface |
|
Use Scenario: MP3 players and digital audio recorders powered via mini-USB, subject to ESD and transient overvoltage in field use. IC Role / Device Role / Timing Role: Front-end protection device with ±15kV HBM ESD rating on IN pin and thermal shutdown for reliability. Use Value: Maintains uninterrupted playback by autoretrying short circuits (e.g., faulty cable shorts) without requiring host MCU intervention. |
Use Scenario: Ruggedized handheld terminals using universal AC/DC adapters in warehouse or logistics environments. IC Role / Device Role / Timing Role: Adapter voltage validator that gates power to main SoC only after 30ms stable ACOK assertion. Use Value: Prevents brownout resets and flash corruption by ensuring clean power-up sequence, leveraging 2.45V UVLO for wide adapter tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage-protection controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4944ELA+T | UVLO = 4.15V (typ); same OVLO = 6.35V, same autoretry mode | Requires higher minimum adapter voltage; unsuitable for low-voltage battery-backed adapters | Select MAX4944ELA+T only when system operates exclusively above 4.15V input - not drop-in compatible with MAX4944LELA+TG65's 2.45V UVLO. |
| MAX4945LELA+T | OVLO = 5.80V (typ); UVLO = 2.45V (typ); same autoretry mode and package | Better suited for 3.3V logic rails or tighter OVLO margin; lower trip point increases false-trigger risk with noisy 5V sources | Choose MAX4945LELA+T when protecting sub-5V systems where 6.35V OVLO is excessive - requires layout review due to different threshold calibration. |
Compared with MAX4944ELA+T and MAX4945LELA+T, the MAX4944LELA+TG65 uniquely combines 2.45V UVLO and 6.35V OVLO in autoretry configuration, making it optimal for dual-voltage adapter interfaces (e.g., USB-C PD fallback + legacy 5V) where both low-startup and precise overvoltage margins are required.
Availability
MAX4944LELA+TG65 is available at Aetrix Electronics and suitable for USB power input protection, Li-ion charger supervision, and portable media player power management requiring stable component supply across industrial temperature ranges and long-term production cycles.
Supply support for MAX4944LELA+TG65 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 high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX4943–MAX4946/MAX4949 family was designed specifically for robust, low-footprint overvoltage and reverse-polarity protection in portable electronics - targeting USB, battery charging, and adapter-input front ends where reliability and small size are critical.
FAQ
What is the overvoltage lockout (OVLO) threshold for MAX4944LELA+TG65?
The MAX4944LELA+TG65 has a factory-trimmed 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 fixed and cannot be adjusted externally - it is optimized to protect standard 5V logic rails from adapter overvoltage while allowing margin for ripple and transient spikes. The MAX4944LELA+TG65 uses this threshold to disable its internal nFET switch immediately upon detecting input voltage exceeding this limit.
Does MAX4944LELA+TG65 support reverse polarity protection?
Yes, the MAX4944LELA+TG65 supports reverse polarity protection via its GP (gate-drive) pin, which drives an external p-channel MOSFET. When the input voltage goes above ground, GP pulls low to turn on the pFET; if the adapter voltage drops below ground (e.g., –28V fault), GP releases and the pFET turns off. This function requires proper selection of an external pFET with appropriate VGS(th) and breakdown rating - the MAX4944LELA+TG65 itself does not provide internal reverse-blocking capability.
What is the undervoltage lockout (UVLO) behavior of MAX4944LELA+TG65?
The MAX4944LELA+TG65 features a fixed 2.45V (typical) undervoltage lockout threshold with 1% hysteresis. When input voltage falls below this threshold, the device enters low-current standby mode: the internal switch turns off, ACOK goes high-impedance, and supply current drops to ≤30µA. This allows reliable operation from weak or partially discharged sources - unlike variants with 4.15V UVLO, the MAX4944LELA+TG65 remains functional even with marginal 3V adapter outputs.
How does the autoretry function work in MAX4944LELA+TG65 during overcurrent events?
During an overcurrent event, the MAX4944LELA+TG65 disables its internal switch within 10µs (typ), then initiates a 15ms (typ) autoretry cycle. After this delay, it attempts to re-enable the switch. If the fault persists, it repeats the cycle - limiting average power dissipation and preventing thermal damage. This behavior differs from latchoff variants (e.g., MAX4944BELA+T), which require full power-cycle reset. The MAX4944LELA+TG65 maintains this autoretry mode continuously until normal load conditions resume.
What package type and footprint does MAX4944LELA+TG65 use?
The MAX4944LELA+TG65 is packaged in an 8-pin µDFN (2mm × 2mm, 0.5mm pitch) with exposed pad, designated as package code L822-1. Its top mark is ABD, and it is RoHS-compliant and lead-free. The package supports high-density layouts in portable devices and requires standard reflow profiles for BiCMOS processes. Pin 1–2 and 6–8 are internally shorted to IN and OUT respectively, reducing trace inductance and simplifying PCB routing for high-current paths.
MAX4944LELA+TG65 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Bulk
- Product Status:
- Active
- 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)
MAX4944LELA+TG65 FAQ
1.How can I place an order for MAX4944LELA+TG65 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4944LELA+TG65 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 MAX4944LELA+TG65 reliable?
The price and inventory of MAX4944LELA+TG65 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4944LELA+TG65 is usually 5 days.
3.What payment methods are accepted for MAX4944LELA+TG65?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4944LELA+TG65 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4944LELA+TG65?
MAX4944LELA+TG65 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4944LELA+TG65 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 MAX4944LELA+TG65?
For technical support, including MAX4944LELA+TG65 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4944LELA+TG65 requirements.
6.How does Aetrix verify that MAX4944LELA+TG65 is sourced from the original manufacturer or authorized distributors?
All MAX4944LELA+TG65 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 MAX4944LELA+TG65 meets industry standards.
7.What is the process for return or replacement of MAX4944LELA+TG65?
All MAX4944LELA+TG65 units undergo pre-shipment inspection (PSI). If there is an issue with MAX4944LELA+TG65, 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 MAX4944LELA+TG65 part is unused and in its original packaging.
Return procedure for MAX4944LELA+TG65:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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