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Analog Devices Inc./Maxim Integrated MAX4944LELA+T
- Part No.:
- MAX4944LELA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- 8-WFDFN
- Datasheet:
-
MAX4944LELA+T.pdf
- Description:
- IC OVERVOLTAGE PROT CTRL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,612
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Product details
Overview
The MAX4944LELA+T from Maxim Integrated is an overvoltage-protection controller with integrated nFET switch, designed for input-side protection in portable power 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 - used to safeguard USB-powered devices, battery chargers, and DC-DC input stages against +28V transients.
For engineers reviewing the MAX4944LELA+T datasheet, MAX4944LELA+T pinout, MAX4944LELA+T application, or MAX4944LELA+T equivalent, key selection criteria include UVLO threshold compatibility (2.45V), OVLO precision (6.35V), autoretry behavior, thermal shutdown at +175°C, and µDFN package integration with GP-driven external pFET for reverse-polarity protection down to –28V.
Technical Context
The MAX4944LELA+T implements a charge-pump–driven internal nFET switch with 15ms (typ) debounce timing to prevent false turn-on during adapter plug-in. Its UVLO threshold of 2.45V enables operation with low-input-voltage sources such as single-cell Li-ion or Li-polymer batteries.
It integrates ACOK - an active-low, open-drain logic output asserting after 30ms (typ) of stable input voltage between VUVLO and VOVLO - and GP, a gate-drive output that pulls low to enable an external pFET for reverse-current blocking. Overcurrent faults trigger autoretry with 15ms (typ) retry intervals and <10µs turn-off time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVLO Threshold | 6.35V (typ); precise trip point for disconnecting input when adapter exceeds safe level for downstream 5V/3.3V circuitry. |
| UVLO Threshold | 2.45V (typ); ensures reliable startup only when input sustains minimum operating voltage for system stability. |
| RON | 80mΩ (typ) at 1A; minimizes conduction loss and self-heating in high-current portable power paths. |
| Current Limit | 1.2A (min); provides robust short-circuit protection without external sensing components. |
| Autoretry Time | 15ms (typ); balances fault clearing and thermal safety by limiting duty cycle during persistent overload. |
| ACOK Assertion Delay | 30ms (typ); guarantees stable input before signaling "adapter OK" to host microcontroller or PMIC. |
| Thermal Shutdown | +175°C (typ); disables switch to prevent junction damage under sustained overload or poor PCB thermal design. |
Pinout & Package
MAX4944LELA+T is housed in an 8-pin µDFN package (2mm × 2mm, L822-1), optimized for space-constrained portable designs and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - IN | Input voltage supply and charge-pump power source | Powers internal oscillator and charge pump; must be bypassed with 1µF ceramic capacitor near pin for ±15kV HBM ESD protection. |
| 3 - GP | pFET gate-drive output | Pulls low to turn on external p-channel MOSFET for reverse-polarity protection down to –28V. |
| 4 - ACOK | Active-low open-drain adapter OK indicator | Asserts low after 30ms stable input; requires external pullup to host I/O voltage for system power sequencing. |
| 5 - GND | Ground reference | Common return path for internal circuitry, charge pump, and switch current; must be low-impedance connection. |
| 6, 7, 8 - OUT | Switch output / load connection | Output node of internal nFET; pins are internally tied and must be shorted externally for proper current sharing and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated nFET with 80mΩ RON | Eliminates need for discrete high-side switch and associated gate-drive circuitry in compact adapters. |
| 2.45V UVLO threshold | Enables compatibility with low-voltage sources like single-cell Li-ion (2.7V–4.2V) while preventing brownout operation. |
| GP-driven external pFET control | Supports bidirectional fault protection: +28V overvoltage and –28V reverse polarity via one IC and one external MOSFET. |
| 15ms autoretry timing | Provides automatic recovery from transient shorts without host intervention, reducing firmware complexity. |
| ±15kV HBM ESD on IN | Meets stringent IEC 61000-4-2 Air-Gap (±15kV) and Contact (±8kV) requirements when properly decoupled. |
Applications
| USB-C Power Delivery Input Protection | Smartphone Charging Circuit Protection |
|---|---|
|
Use Scenario: Protects baseband processor and PMIC inputs from voltage surges during USB-C adapter hot-plug or faulty chargers. IC Role / Device Role / Timing Role: Acts as primary input-side protector with 6.35V OVLO and 2.45V UVLO, enabling safe 5V rail startup and fast (<10µs) fault isolation. Use Value: Prevents latch-up or permanent damage to sensitive SoC inputs while maintaining compatibility with variable-output USB PD adapters. |
Use Scenario: Secures battery charging path against overvoltage from wall adapters or automotive USB ports. IC Role / Device Role / Timing Role: Controls power delivery to buck-boost charger IC using ACOK handshake and GP-driven reverse-blocking pFET. Use Value: Ensures charger IC only activates after stable input is confirmed, eliminating false start and reverse-current leakage into dead batteries. |
| Portable Medical Device Power Input | Industrial Handheld Scanner Power Management |
|
Use Scenario: Guards diagnostic sensor modules and microcontrollers from field-induced transients in battery-operated medical monitors. IC Role / Device Role / Timing Role: Provides fail-safe input conditioning with thermal shutdown (+175°C) and autoretry to sustain operation during intermittent cable faults. Use Value: Maintains regulatory compliance (IEC 60601-1 creepage/isolation) without adding discrete TVS diodes or complex supervision logic. |
Use Scenario: Manages dual-input power (battery + external adapter) in rugged barcode scanners subject to ESD and mechanical stress. IC Role / Device Role / Timing Role: Serves as intelligent power selector with GP-controlled pFET to block reverse current from battery to adapter port. Use Value: Extends battery life by eliminating parasitic discharge paths and supports hot-swap adapter transitions without system reset. |
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 behavior | Requires ≥4.15V input to enable; unsuitable for single-cell Li-ion systems below 4.15V | Select MAX4944ELA+T only if system input never drops below 4.15V; otherwise MAX4944LELA+T ensures wider voltage range coverage. |
| MAX4945LELA+T | OVLO = 5.80V (vs. 6.35V); identical UVLO (2.45V), RON, and autoretry timing | Triggers earlier overvoltage cutoff - better suited for 5V-tolerant systems with tighter margin | Choose MAX4945LELA+T when protecting 5V logic rails where 6.35V OVLO risks exposure to 5.5V absolute maximum ratings. |
Compared with MAX4944ELA+T and MAX4945LELA+T, the MAX4944LELA+T uniquely combines 2.45V UVLO with 6.35V OVLO in autoretry mode - making it optimal for portable systems requiring both low-voltage startup headroom and mid-range overvoltage tolerance without sacrificing fault recovery capability.
Availability
MAX4944LELA+T is available at Aetrix Electronics and suitable for USB-C power management, smartphone charging circuits, and portable medical device power inputs requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for MAX4944LELA+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) 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, space-efficient overvoltage and reverse-polarity protection in portable electronics - integrating charge-pump switching, logic signaling, and fault management in a single µDFN package.
FAQ
What is the overvoltage lockout (OVLO) threshold for MAX4944LELA+T?
The MAX4944LELA+T has a preset overvoltage lockout threshold of 6.35V (typical), with ±0.35V tolerance over temperature. This value is factory-trimmed and fixed - no external resistor network is required to set or adjust the OVLO point. The MAX4944LELA+T uses this threshold to disable its internal nFET switch instantly when input voltage exceeds 6.35V, protecting downstream 5V-rated circuitry from overvoltage damage.
Does MAX4944LELA+T support reverse-polarity protection?
Yes, the MAX4944LELA+T supports reverse-polarity protection down to –28V via its GP (gate-drive output) pin, which drives the gate of an external p-channel MOSFET. When input voltage drops below ground, GP pulls low to turn off the pFET, blocking reverse current flow into the protected load. This functionality requires no additional control logic and works in conjunction with the internal nFET's +28V overvoltage protection to provide bidirectional fault coverage.
What is the purpose of the ACOK pin on MAX4944LELA+T?
The ACOK pin on MAX4944LELA+T is an active-low, open-drain output that signals successful input stabilization. It asserts low only after the input voltage remains within the valid window (2.45V ≤ VIN ≤ 6.35V) for 30ms (typical). This provides a clean, debounced "adapter OK" signal to host microcontrollers or PMICs for coordinated power sequencing - ensuring downstream regulators and processors activate only after stable input is confirmed.
How does the autoretry function work in MAX4944LELA+T during overcurrent events?
During an overcurrent event, the MAX4944LELA+T disables its internal switch within 10µs (typical), then initiates a 15ms (typical) autoretry cycle. After this interval, it attempts to re-enable the switch. If the fault persists, it repeats the cycle - limiting average power dissipation and preventing thermal runaway. This behavior differs from latchoff variants (e.g., MAX4944BELA+T) and allows autonomous recovery from transient shorts without host intervention.
What package type and footprint does MAX4944LELA+T use?
The MAX4944LELA+T is supplied in an 8-pin µDFN package measuring 2mm × 2mm (package code L822-1), with exposed pad for thermal enhancement. Its pinout is standardized across the MAX4943–MAX4946 family: IN (pins 1,2), GP (pin 3), ACOK (pin 4), GND (pin 5), and OUT (pins 6,7,8 shorted together). The land pattern follows Maxim's document 21-0164 and supports reflow soldering per JEDEC J-STD-020 moisture sensitivity level 1.
MAX4944LELA+T 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+T FAQ
1.How can I place an order for MAX4944LELA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4944LELA+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 MAX4944LELA+T reliable?
The price and inventory of MAX4944LELA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4944LELA+T is usually 5 days.
3.What payment methods are accepted for MAX4944LELA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4944LELA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4944LELA+T?
MAX4944LELA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4944LELA+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 MAX4944LELA+T?
For technical support, including MAX4944LELA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4944LELA+T requirements.
6.How does Aetrix verify that MAX4944LELA+T is sourced from the original manufacturer or authorized distributors?
All MAX4944LELA+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 MAX4944LELA+T meets industry standards.
7.What is the process for return or replacement of MAX4944LELA+T?
All MAX4944LELA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4944LELA+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 MAX4944LELA+T part is unused and in its original packaging.
Return procedure for MAX4944LELA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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