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Analog Devices Inc./Maxim Integrated MAX4791EUK+T
- Part No.:
- MAX4791EUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Current Regulation/Management
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX4791EUK+T.pdf
- Description:
- IC CURRENT LIMITING SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:644
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Product details
Overview
MAX4791EUK+T from Maxim Integrated is a single-channel, forward/reverse current-limited load switch IC with 250mA guaranteed current limit, 0.2Ω on-resistance, and latch-off fault response. It operates from 2.3V to 5.5V and features FLAG output for overcurrent/thermal/UVLO fault indication. Designed for SDIO port protection in portable electronics, it prevents host damage during faulty load conditions.
For engineers reviewing the MAX4791EUK+T datasheet, MAX4791EUK+T pinout, MAX4791EUK+T application, or MAX4791EUK+T equivalent, key selection criteria include its 250mA current-limit threshold, 14ms blanking time, latch-off behavior (no autoretry), SOT23-5 package footprint, and FLAG-driven system-level fault handling in battery-powered devices.
Technical Context
The MAX4791EUK+T implements dual-direction current sensing using an internal sense resistor and two reference comparators to detect forward and reverse overcurrent faults independently. Its latch-off architecture disables the switch permanently after blanking time expiration and asserts open-drain FLAG until ON is cycled or input power is reset.
It integrates undervoltage lockout (2.2V rising threshold), thermal shutdown at +150°C with 15°C hysteresis, reverse current protection up to 375mA, and 5µs current-limit response time - all operating within -40°C to +85°C ambient range without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit | 250mA min forward / 375mA min reverse - ensures robust SDIO load switching without host bus damage |
| On-Resistance | 0.2Ω typ at +25°C - minimizes voltage drop and power loss in 3.3V/5V rail switching |
| Blanking Time | 14ms min - suppresses false trips during hot-swap transients and capacitive load charging |
| FLAG Response | Open-drain, latched low on fault - enables microprocessor interrupt-driven fault recovery |
| Supply Range | 2.3V to 5.5V - supports direct integration with Li-ion, USB, and regulated logic rails |
| Quiescent Current | 80µA typ - enables ultra-low standby power in always-on portable systems |
| Shutdown Current | 0.01µA - eliminates leakage when ON pin is held low |
Pinout & Package
MAX4791EUK+T uses a 5-pin SOT23 package (Package Code U5+2, Outline 21-0057) with exposed paddle connected to GND for thermal performance. Pin 4 is N.C. and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | FLAG | Open-drain fault indicator - requires external pullup to IN; asserts low on overcurrent, thermal, or UVLO fault |
| 2 | GND | Power and signal reference ground - connect exposed paddle to large ground plane |
| 3 | ON | Active-high enable - high = switch enabled; low = shutdown (0.01µA ISHDN) |
| 4 | N.C. | No internal connection - leave floating or unpopulated on PCB |
| 5 | IN | Input power rail - bypass with 0.1µF ceramic capacitor to GND near pin |
| - | OUT | Switched output - bypass with 0.1µF ceramic capacitor to GND near pin |
Key Features
| Feature | Design Value |
|---|---|
| Latch-off fault response | Guarantees system safety by holding OFF until ON or VIN reset - eliminates uncontrolled retry cycles |
| Reverse current protection | 375mA reverse limit prevents backfeed into powered-down subsystems during battery swap or hot-plug |
| Thermal shutdown with hysteresis | +150°C trip / +135°C recovery - protects against sustained short-circuit power dissipation in confined spaces |
| Undervoltage lockout | 2.2V rising threshold prevents erratic switching during brown-out or startup ramp-up |
| Fast current-limit detection | 5µs response time ensures immediate protection against fast-rising short-circuit currents |
Applications
| SDIO Card Interface Protection | USB Peripheral Power Switching |
|---|---|
|
Use Scenario: Hot-swapping microSD cards in handheld GPS units where transient inrush current may exceed safe limits. IC Role / Device Role / Timing Role: Load switch placed between main PMIC rail and SDIO VCC line; monitors bidirectional current flow and asserts FLAG on fault. Use Value: Prevents host controller latch-up or voltage droop during card insertion, enabling reliable field operation without manual reset. |
Use Scenario: Enabling/disabling power to USB OTG peripherals (e.g., keyboards, flash drives) in smartphones. IC Role / Device Role / Timing Role: Single-pole load switch controlled by AP GPIO; provides current-limited 5V rail delivery with fault reporting via FLAG. Use Value: Eliminates need for discrete FET + sense resistor + comparator solution - reduces BOM count and layout area by >40%. |
| Portable Medical Sensor Hub | Smartphone Camera Module Power Control |
|
Use Scenario: Isolating power to disposable biosensor interfaces during clinical use to prevent cross-contamination-induced shorts. IC Role / Device Role / Timing Role: Fault-tolerant power gate between battery management IC and sensor interface; latches off on persistent overload. Use Value: Guarantees fail-safe shutdown without firmware intervention - meets IEC 62304 Class B safety requirements. |
Use Scenario: Sequencing power to dual-camera modules (wide + tele) in foldable smartphones with tight thermal budgets. IC Role / Device Role / Timing Role: Independent current-limited rail switch per module; FLAG signals fault to camera ISP for graceful degradation. Use Value: Enables per-module power cycling without resetting entire imaging subsystem - improves user experience during multi-camera transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limit switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4791EUS+T | Same electrical specs but 4-pin SOT143 package (no FLAG pin, no reverse current limit) | Lacks FLAG reporting and reverse protection - suitable only for simple unidirectional loads | Select when board space allows larger SOT143 and fault visibility is not required |
| MAX4792EUK+T | Same package and pinout, but includes autoretry instead of latch-off; 250mA forward limit retained | Automatically recovers from transient faults - unsuitable where persistent faults must halt operation | Choose when system firmware can handle intermittent faults and manual reset is undesirable |
Compared with MAX4791EUK+T, MAX4791EUS+T sacrifices fault visibility and reverse protection for smaller footprint, while MAX4792EUK+T trades deterministic latch-off for autonomous recovery - making MAX4791EUK+T optimal for safety-critical, manually reset-requiring SDIO and medical applications.
Availability
MAX4791EUK+T is available at Aetrix Electronics and suitable for SDIO interface protection, USB peripheral power control, and portable medical sensor hub designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX4791EUK+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and portable applications.
The MAX4789–MAX4794 family was developed specifically for intelligent load switching in space-constrained, battery-powered devices - delivering integrated current limiting, fault reporting, and thermal protection in minimal footprints.
FAQ
What is the guaranteed forward current limit for MAX4791EUK+T?
The MAX4791EUK+T guarantees a minimum forward current limit of 250mA across its full operating temperature range (-40°C to +85°C). This value is tested and specified in the Electrical Characteristics table of the official datasheet, ensuring consistent overcurrent protection for SDIO and other load-switching applications without requiring external calibration.
Does MAX4791EUK+T support reverse current limiting, and what is its threshold?
Yes, MAX4791EUK+T provides reverse current limiting with a guaranteed minimum threshold of 375mA. This feature prevents backfeed from downstream circuits into the power source during hot-swap events or battery replacement, and is explicitly documented in the "Electrical Characteristics" section under "Reverse Current Limit" for the MAX4791 variant.
How does the FLAG pin behave during a thermal shutdown event on MAX4791EUK+T?
During thermal shutdown, the MAX4791EUK+T immediately asserts FLAG low (with no blanking delay), disconnects OUT from IN, and reduces supply current to 8µA. FLAG remains latched low until the ON pin is toggled or VIN is cycled - this behavior is confirmed in the "Detailed Description" and "FLAG Indicator" sections of the datasheet.
What is the function of Pin 4 (N.C.) on the MAX4791EUK+T SOT23-5 package?
Pin 4 of the MAX4791EUK+T is designated N.C. (No Connection) and is not internally bonded or electrically connected. It must be left unconnected on the PCB - neither grounded nor tied to any signal - as confirmed in the "Pin Description" table and "Pin Configurations" diagram of the official datasheet.
Can MAX4791EUK+T be used with a 1.8V supply voltage?
No, MAX4791EUK+T cannot operate reliably at 1.8V. Its absolute minimum supply voltage is 2.3V, and undervoltage lockout activates below 2.2V (rising edge). Attempting to power it from 1.8V will result in disabled switching and undefined FLAG behavior - this is strictly defined in the "Absolute Maximum Ratings" and "Electrical Characteristics" tables.
MAX4791EUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Limiting
- Sensing Method:
- -
- Accuracy:
- -
- Voltage - Input:
- 2.3V ~ 5.5V
- Current - Output:
- 250mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX4791EUK+T FAQ
1.How can I place an order for MAX4791EUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4791EUK+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 MAX4791EUK+T reliable?
The price and inventory of MAX4791EUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4791EUK+T is usually 5 days.
3.What payment methods are accepted for MAX4791EUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4791EUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4791EUK+T?
MAX4791EUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4791EUK+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 MAX4791EUK+T?
For technical support, including MAX4791EUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4791EUK+T requirements.
6.How does Aetrix verify that MAX4791EUK+T is sourced from the original manufacturer or authorized distributors?
All MAX4791EUK+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 MAX4791EUK+T meets industry standards.
7.What is the process for return or replacement of MAX4791EUK+T?
All MAX4791EUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4791EUK+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 MAX4791EUK+T part is unused and in its original packaging.
Return procedure for MAX4791EUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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