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Analog Devices Inc./Maxim Integrated MAX4944ELA+TG104
- Part No.:
- MAX4944ELA+TG104
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- 8-WFDFN
- Datasheet:
-
MAX4944ELA+TG104.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:4,255
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Product details
Overview
The MAX4944ELA+TG104 from Maxim Integrated is an overvoltage-protection controller with integrated nFET switch, designed for USB/adapter-input power path management in portable electronics. It features a 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. It safeguards systems such as smartphones and digital cameras against +28V input faults while enabling reverse-polarity protection via external pFET drive.
For engineers reviewing the MAX4944ELA+TG104 datasheet, MAX4944ELA+TG104 pinout, MAX4944ELA+TG104 application, or MAX4944ELA+TG104 equivalent, key selection criteria include its fixed 6.35V OVLO threshold, 15ms (typ) debounce and retry timing, ACOK power-good signaling, thermal shutdown at +175°C, and compatibility with 2mm × 2mm µDFN layout constraints.
Technical Context
The MAX4944ELA+TG104 employs an internal charge pump to drive its integrated nFET switch, enabling gate voltage boosting above VIN for low RON. Its functional diagram includes a 15ms (typ) debounce timer that prevents false turn-on during adapter plug-in transients, and a 30ms (typ) ACOK assertion timer ensuring stable input before signaling power-good.
It implements autoretry overcurrent protection - turning off within 10µs (typ) on fault detection, then attempting re-enabling after 15ms (typ) - and supports optional external pFET control via the GP pin for reverse-voltage protection down to –28V. UVLO and OVLO thresholds are factory-trimmed and temperature-stable, with <1% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVLO Threshold | 6.35V (typ); disables internal switch if input exceeds this level to prevent downstream damage |
| UVLO Threshold | 4.15V (typ); places device in low-current standby if input drops below this level |
| RON | 80mΩ (typ) at 1A; minimizes conduction loss and self-heating in 5V power paths |
| Current Limit | 1.2A (min); provides robust short-circuit protection with fast 10µs turn-off |
| Debounce Time | 15ms (typ); filters input transients during hot-plug events to avoid spurious switching |
| ACOK Assertion | 30ms (typ); delays active-low power-good signal until input stabilizes within valid window |
| Operating Temp | –40°C to +85°C; qualified for consumer and industrial portable equipment environments |
Pinout & Package
Package: 8-pin µDFN (2mm × 2mm), RoHS-compliant, top-mark ABB, package code L822-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - IN | Voltage Input | Powers internal charge pump; accepts 2.2V–28V; requires 1µF ceramic bypass for ±15kV HBM ESD rating |
| 3 - GP | pFET Gate Drive | Active-low output driving external p-channel FET for reverse-polarity protection; clamped to ≤19V vs. IN |
| 4 - ACOK | Adapter OK Indicator | Open-drain, active-low logic output asserting after 30ms stable input; requires external pullup |
| 5 - GND | Ground Reference | Common return for all internal circuitry and external bypass capacitors |
| 6, 7, 8 - OUT | Switch Output | Power path output; pins must be shorted together to handle full load current and minimize impedance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated nFET Switch | Eliminates need for external high-side switch; 80mΩ RON reduces board space and BOM count |
| Autoretry Fault Recovery | Automatically recovers from transient overloads without host intervention, reducing system lockup risk |
| GP-Driven Reverse Polarity Protection | Enables –28V fault tolerance using low-cost external pFET, extending protection beyond internal switch limits |
| ACOK Power-Good Signaling | Provides deterministic, timed confirmation of valid input voltage to enable downstream DC-DC sequencing |
| Thermal Shutdown | Disables switch at +175°C (typ) with 40°C hysteresis, preventing thermal runaway under sustained overload |
Applications
| Smartphone Adapter Interface | Digital Camera Power Management |
|---|---|
Use Scenario: USB wall adapter powers smartphone mainboard through shared charging/power path. IC Role / Device Role / Timing Role: Overvoltage-protection controller enforcing strict 6.35V OVLO to prevent damage from faulty adapters or surge events. Use Value: Prevents catastrophic failure of PMIC and baseband ICs by cutting off >6.35V input within microseconds, while ACOK enables safe SoC boot sequencing. | Use Scenario: External 5V adapter supplies power to camera image sensor, processor, and display subsystems. IC Role / Device Role / Timing Role: Primary input protection switch with autoretry behavior during lens motor stall or flash capacitor inrush. Use Value: Maintains system uptime during brief overcurrent events (e.g., motor startup), avoiding hard reset while limiting energy dissipation in the switch. |
| MP3 Player Charging Circuit | PDA Battery Charging Path |
Use Scenario: Portable audio player accepts power from multiple generic USB chargers with varying quality and regulation. IC Role / Device Role / Timing Role: Input supervisor ensuring only clean, regulated 4.15V–6.35V supply reaches linear charger IC and battery. Use Value: Blocks unregulated or overvoltage inputs before they stress lithium-ion battery protection circuitry or cause thermal issues in charging IC. | Use Scenario: PDA uses dual-input power architecture: battery and external adapter, requiring seamless handoff and fault isolation. IC Role / Device Role / Timing Role: Adapter-input switch with GP-driven pFET enabling reverse-current blocking when battery discharges into adapter port. Use Value: Prevents backfeed from battery into faulty or disconnected adapter, preserving battery life and avoiding adapter port damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage-protection controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4944BELA+T | Latchoff (not autoretry) overcurrent response; same OVLO (6.35V), UVLO (4.15V), and package | Suitable where permanent fault isolation is required (e.g., safety-critical subsystems) | Select MAX4944BELA+T if system must remain latched off after first overcurrent event until manual reset or power cycle |
| MAX4945ELA+T | Lower OVLO (5.80V typ); identical autoretry behavior, RON, and timing specs | Better suited for 5V-tolerant systems with tighter overvoltage margin (e.g., USB 2.0 peripheral ports) | Choose MAX4945ELA+T when protecting circuits rated for ≤5.5V operation and requiring stricter OVLO guardband |
Compared with MAX4944BELA+T, the MAX4944ELA+TG104 enables automatic recovery from intermittent faults; compared with MAX4945ELA+T, it offers higher OVLO headroom for legacy 5V adapter ecosystems where voltage overshoot is common.
Availability
MAX4944ELA+TG104 is available at Aetrix Electronics and suitable for smartphone adapter interfaces, digital camera power management, MP3 player charging circuits, and PDA battery charging paths requiring stable component supply across production lifecycles.
Supply support for MAX4944ELA+TG104 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 applications in communications, computing, consumer, and industrial markets.
The MAX4943–MAX4946/MAX4949 family was developed specifically for robust, compact overvoltage and reverse-polarity protection in portable USB-powered devices, integrating critical protection functions into minimal 2mm × 2mm footprints.
FAQ
What is the overvoltage lockout (OVLO) threshold for the MAX4944ELA+TG104?
The MAX4944ELA+TG104 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 threshold is fixed and not adjustable. When the input voltage exceeds this level, the internal nFET switch turns off within 20µs to protect downstream circuitry. The MAX4944ELA+TG104 maintains this specification consistently across its operating temperature range and supply conditions.
Does the MAX4944ELA+TG104 support reverse-voltage protection?
Yes, the MAX4944ELA+TG104 supports reverse-voltage protection down to –28V via its GP (gate-drive) pin, which actively pulls low to turn on an external p-channel MOSFET. This configuration blocks reverse current flow when the input falls below ground potential. The GP pin includes internal clamping to limit voltage stress between GP and IN to ≤19V, ensuring safe operation even with +28V input. The MAX4944ELA+TG104 does not provide reverse protection using its internal switch alone - external pFET implementation is required.
How does the MAX4944ELA+TG104 respond to overcurrent faults?
The MAX4944ELA+TG104 responds to overcurrent faults with autoretry behavior: it disables the internal switch within 10µs (typical) when load current exceeds 1.2A (min), then automatically attempts re-enabling after a 15ms (typical) retry interval. If the fault persists, the cycle repeats, maintaining low average power dissipation. This differs from latchoff variants like MAX4944BELA+T. The MAX4944ELA+TG104's autoretry mode is confirmed in its Ordering Information table and Functional Diagram, and is integral to its use in portable devices subject to transient inrush currents.
What is the purpose of the ACOK pin on the MAX4944ELA+TG104?
The ACOK pin on the MAX4944ELA+TG104 is an active-low, open-drain output that signals successful power-up: it asserts low only after the input voltage remains stably within the valid window (VUVLO < VIN < VOVLO) for 30ms (typical). It requires an external pullup resistor to the host system's logic I/O voltage. During overvoltage, undervoltage, or overcurrent faults, ACOK goes high-impedance or deasserts, providing a reliable hardware handshake for SoC boot sequencing. This behavior is explicitly defined in the MAX4944ELA+TG104's Electrical Characteristics and Detailed Description sections.
Can the MAX4944ELA+TG104 operate with a 3V input supply?
No, the MAX4944ELA+TG104 is not specified to operate with a 3V input supply. Its minimum input voltage is 2.2V, but its UVLO threshold is 4.15V (typical), meaning the device enters low-current standby and disables the switch if VIN falls below that level. For reliable operation, input must exceed 4.15V to enable the internal charge pump and switch. The MAX4946 variant (4.56V OVLO, 2.45V UVLO) is the only family member qualified for 3V nominal operation. The MAX4944ELA+TG104's design targets 5V adapter-based systems, and its timing, RON, and protection thresholds are characterized accordingly.
MAX4944ELA+TG104 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+TG104 FAQ
1.How can I place an order for MAX4944ELA+TG104 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4944ELA+TG104 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+TG104 reliable?
The price and inventory of MAX4944ELA+TG104 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4944ELA+TG104 is usually 5 days.
3.What payment methods are accepted for MAX4944ELA+TG104?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4944ELA+TG104 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4944ELA+TG104?
MAX4944ELA+TG104 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4944ELA+TG104 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+TG104?
For technical support, including MAX4944ELA+TG104 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4944ELA+TG104 requirements.
6.How does Aetrix verify that MAX4944ELA+TG104 is sourced from the original manufacturer or authorized distributors?
All MAX4944ELA+TG104 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+TG104 meets industry standards.
7.What is the process for return or replacement of MAX4944ELA+TG104?
All MAX4944ELA+TG104 units undergo pre-shipment inspection (PSI). If there is an issue with MAX4944ELA+TG104, 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+TG104 part is unused and in its original packaging.
Return procedure for MAX4944ELA+TG104:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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