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Analog Devices Inc./Maxim Integrated MAX4944LELA+G65
- Part No.:
- MAX4944LELA+G65
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- 8-WFDFN
- Datasheet:
-
MAX4944LELA+G65.pdf
- Description:
- OVERVOLTAGE-PROTECTION CONTROLLE
- Quantity:
- Payment:
- Shipping:
Inventory:15,812
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Product details
Overview
MAX4944LELA+G65 from Maxim Integrated is an overvoltage-protection controller with integrated nFET switch, designed for input-side protection in low-voltage portable systems. 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. It safeguards USB-powered devices, battery chargers, and DC-DC input stages against +28V faults.
For engineers reviewing the MAX4944LELA+G65 datasheet, MAX4944LELA+G65 pinout, MAX4944LELA+G65 application, or MAX4944LELA+G65 equivalent, key selection criteria include UVLO threshold compatibility (2.45V), OVLO precision (6.35V ±0.35V), autoretry timing (15ms typ), ACOK assertion delay (30ms), and µDFN package thermal performance in space-constrained handheld designs.
Technical Context
The MAX4944LELA+G65 integrates a charge-pump–driven nFET switch with precise voltage monitoring circuitry. Its internal oscillator enables 15ms (typ) debounce before turn-on and controls ACOK assertion after a stable 30ms window within VUVLO–VOVLO.
It implements fast fault response: <20µs switch turn-off during overvoltage/undervoltage events, 10µs overcurrent shutdown, and thermal shutdown at +175°C (typ) with 40°C hysteresis. The GP pin drives an external pFET for reverse-polarity protection down to –28V when required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVLO Threshold | 6.35V (typ), ±0.35V max - sets precise upper input voltage limit before internal FET disables |
| UVLO Threshold | 2.45V (typ), 2.30V–2.60V range - ensures reliable startup only above valid adapter voltage |
| RON | 80mΩ (typ), ≤200mΩ max - minimizes conduction loss and self-heating at 1.2A load |
| Overcurrent Limit | 1.2A (min), 1.7A (typ), 4.0A (max) - provides robust short-circuit protection without nuisance tripping |
| ACOK Assertion Delay | 30ms (typ) - guarantees stable input before signaling power-good to host microcontroller |
| Autoretry Interval | 15ms (typ) - enables automatic recovery from transient overloads while limiting average fault power |
| Operating Temp | –40°C to +85°C - supports full industrial temperature range in consumer and embedded applications |
Pinout & Package
MAX4944LELA+G65 is housed in an 8-pin µDFN package (2mm × 2mm, 0.5mm pitch), optimized for high-density portable PCB layouts and thermal dissipation in thin-profile devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - IN | Voltage Input | Powers internal charge pump; requires 1µF ceramic bypass for ±15kV HBM ESD rating |
| 3 - GP | pFET Gate Drive Output | Active-low open-drain output that pulls external pFET gate low when IN > 0V |
| 4 - ACOK | Adapter OK Indicator | Active-low open-drain logic output asserted low after 30ms stable input within UVLO/OVLO window |
| 5 - GND | Ground Reference | Common return path for internal circuitry, charge pump, and protection comparators |
| 6, 7, 8 - OUT | Switch Output | Power output node; pins must be shorted together to handle full 1.2A load and reduce resistance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated nFET Switch | 80mΩ (typ) RON eliminates need for external MOSFET and reduces BOM count in compact adapters |
| Precision UVLO/OVLO | 2.45V/6.35V thresholds enable reliable operation with 3.3V or 5V system rails and Li-ion charger inputs |
| Autoretry Fault Recovery | 15ms retry interval allows automatic restoration after brief shorts-no manual reset or host intervention needed |
| ACOK Power-Good Signal | 30ms-blanked active-low output synchronizes host processor wake-up with verified input stability |
| Reverse Polarity Support | GP pin drives external pFET to block –28V faults-critical for USB-C and dual-polarity adapter interfaces |
Applications
| USB-Powered Portable Devices | Smartphone Charging Circuits |
|---|---|
|
Use Scenario: Protecting baseband processors and PMICs from faulty wall adapters or automotive USB ports delivering up to +28V. IC Role / Device Role / Timing Role: Input-side overvoltage guard; monitors VIN continuously and disables internal FET within 20µs if threshold exceeded. Use Value: Prevents catastrophic failure of downstream 1.8V/3.3V ICs by clamping fault energy before it propagates past the protection device. |
Use Scenario: Securing charging IC inputs against voltage surges during hot-plug or adapter switching in dual-input (USB + barrel jack) smartphones. IC Role / Device Role / Timing Role: Primary input supervisor; asserts ACOK only after 30ms stable voltage, enabling safe charger enable sequencing. Use Value: Eliminates false charger activation and prevents battery overcharge due to transient input spikes or noisy adapter outputs. |
| Portable Media Players | Industrial Handheld Terminals |
|
Use Scenario: Safeguarding audio codecs and display drivers in MP3 players exposed to unregulated travel adapters or shared USB hubs. IC Role / Device Role / Timing Role: Overvoltage and undervoltage monitor; enters low-current standby below 2.45V to preserve battery during brownout. Use Value: Extends runtime by reducing quiescent current to 30µA at UVLO, while maintaining fast 15ms debounce to avoid false turn-on. |
Use Scenario: Protecting 3.3V logic and RF modules in ruggedized barcode scanners powered via field-deployed 12V adapters subject to load dump transients. IC Role / Device Role / Timing Role: Fault-tolerant power switch; latches off only on persistent overcurrent (not autoretry), ensuring fail-safe shutdown in safety-critical use. Use Value: Guarantees deterministic behavior under sustained overload-prevents thermal runaway in sealed enclosures with limited airflow. |
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 (vs. 2.45V); same OVLO (6.35V), RON, and autoretry | Designed for 5V nominal systems; unsuitable for 3.3V or Li-ion–fed circuits where input may dip near 2.5V | Select MAX4944ELA+T only when host system requires higher UVLO to reject weak or aging adapters |
| MAX4945LELA+T | OVLO = 5.80V (vs. 6.35V); identical UVLO (2.45V), RON, and autoretry | Better suited for tighter 5.0V ±5% supply rails; less margin against 5.5V USB OTG or LDO dropout scenarios | Choose MAX4945LELA+T when protecting circuits with strict 5.0V tolerance and no headroom for 6.35V OVLO overshoot |
Compared with MAX4944ELA+T and MAX4945LELA+T, the MAX4944LELA+G65 uniquely balances low-UVLO startup (2.45V) with mid-range OVLO (6.35V), making it optimal for dual-role 3.3V/5V portable systems where both deep discharge recovery and USB-compliant overvoltage margin are required.
Availability
MAX4944LELA+G65 is available at Aetrix Electronics and suitable for USB-C accessory design, smartphone charging circuit integration, and industrial handheld terminal power management requiring stable component supply across long production lifecycles.
Supply support for MAX4944LELA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for demanding industrial, communications, and consumer applications.
The MAX4943–MAX4946/MAX4949 family was engineered specifically for robust, space-efficient overvoltage protection in battery-powered portable electronics-emphasizing precision thresholds, fast fault response, and minimal external components.
FAQ
What is the exact overvoltage lockout (OVLO) threshold for MAX4944LELA+G65?
The MAX4944LELA+G65 has a guaranteed overvoltage lockout threshold of 6.35V (typical), with a specified range of 6.00V to 6.70V at TA = –40°C to +85°C. This value is factory-trimmed and does not require external resistor programming-ensuring consistent trip behavior across units and temperature without calibration.
Does MAX4944LELA+G65 support reverse polarity protection?
Yes, the MAX4944LELA+G65 supports reverse polarity protection via its GP pin, which drives an external p-channel MOSFET. When the input voltage drops below ground, GP pulls low to turn off the pFET, blocking currents down to –28V-provided the external pFET's VGS rating and breakdown voltage are appropriately selected.
How does the autoretry function behave during a sustained short circuit on MAX4944LELA+G65?
During a sustained short, the MAX4944LELA+G65 disables its internal switch within 10µs, waits 15ms (typ), then attempts to re-enable. If the fault persists, it repeats the cycle-resulting in a low-duty-cycle pulsed output that limits average power dissipation and prevents thermal damage. No host intervention is required.
What is the purpose of the ACOK pin on MAX4944LELA+G65, and how should it be interfaced?
The ACOK pin on MAX4944LELA+G65 is an active-low, open-drain output that signals valid input voltage. It asserts low only after VIN remains stably between 2.45V and 6.35V for 30ms (typ). Interface requires a pullup resistor (e.g., 10kΩ) to the host's I/O voltage rail-enabling direct connection to microcontroller GPIO or power sequencer inputs.
Can MAX4944LELA+G65 operate with a 3.3V input supply, and what is its quiescent current in that condition?
Yes, MAX4944LELA+G65 operates with input voltages as low as 2.2V and is fully functional at 3.3V. At VIN = 3.3V and TA = +25°C, its typical supply current is 100µA; under UVLO conditions (VIN = 2.2V), it draws only 30µA-making it suitable for battery-backed or ultra-low-power portable applications.
MAX4944LELA+G65 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+G65 FAQ
1.How can I place an order for MAX4944LELA+G65 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4944LELA+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 MAX4944LELA+G65 reliable?
The price and inventory of MAX4944LELA+G65 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4944LELA+G65 is usually 5 days.
3.What payment methods are accepted for MAX4944LELA+G65?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4944LELA+G65 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4944LELA+G65?
MAX4944LELA+G65 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4944LELA+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 MAX4944LELA+G65?
For technical support, including MAX4944LELA+G65 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4944LELA+G65 requirements.
6.How does Aetrix verify that MAX4944LELA+G65 is sourced from the original manufacturer or authorized distributors?
All MAX4944LELA+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 MAX4944LELA+G65 meets industry standards.
7.What is the process for return or replacement of MAX4944LELA+G65?
All MAX4944LELA+G65 units undergo pre-shipment inspection (PSI). If there is an issue with MAX4944LELA+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 MAX4944LELA+G65 part is unused and in its original packaging.
Return procedure for MAX4944LELA+G65:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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