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Analog Devices Inc./Maxim Integrated MAX4791EUK+
- Part No.:
- MAX4791EUK+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Current Regulation/Management
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX4791EUK+.pdf
- Description:
- IC CURRENT LIMITING SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,110
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Product details
Overview
MAX4791EUK+ from Maxim Integrated is a single-channel, forward/reverse current-limited load switch with 250mA guaranteed current limit, 0.2Ω on-resistance, and 14ms fault-blanking time, designed for SDIO port protection in portable electronics. It features latch-off fault response, FLAG output assertion on overcurrent/thermal/UVLO faults, and operates from 2.3V to 5.5V supply.
For engineers reviewing the MAX4791EUK+ datasheet, MAX4791EUK+ pinout, MAX4791EUK+ application, or MAX4791EUK+ equivalent, this page delivers verified electrical specs, package mapping to 5-pin SOT23 (U5-2), functional role in hot-swap load switching, and validated alternative options for SDIO and handheld power management designs.
Technical Context
The MAX4791EUK+ implements a BiCMOS-based current-limit architecture that compares voltage across an internal sense resistor against dual reference thresholds to detect forward (250mA min) and reverse (375mA min) overcurrent conditions. Fault detection triggers after a guaranteed 14ms blanking period, avoiding false trips during capacitive load transients.
Unlike autoretry variants (e.g., MAX4792), the MAX4791EUK+ enters a latched-off state upon sustained fault - requiring ON pin toggle or VIN cycle to reset. Its open-drain FLAG output asserts low under thermal shutdown (+150°C), UVLO (<2.2V), or post-blanking current-limit violation, and requires external pull-up to IN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit (Forward) | 250mA minimum - ensures reliable SDIO card insertion without tripping during typical 200–240mA peak loads. |
| On-Resistance | 0.2Ω typical at +25°C - limits voltage drop to ≤50mV at 250mA, preserving rail integrity for low-voltage peripherals. |
| Blanking Time | 14ms minimum - suppresses false fault assertions during hot-swap transients of capacitive SDIO loads. |
| Supply Range | 2.3V to 5.5V - supports direct integration with Li-ion battery rails (3.0–4.2V) and 3.3V/5V system supplies. |
| FLAG Response | Open-drain, logic-low assertion - enables microprocessor interrupt signaling with external pull-up; no internal pull-up. |
| Quiescent Current | 80µA typical - minimizes standby power draw in always-on mobile device subsystems. |
| Shutdown Current | 0.01µA - reduces leakage to negligible levels when ON = low, critical for battery longevity. |
Pinout & Package
MAX4791EUK+ is packaged in a 5-pin SOT23 (Package Code U5-2, Outline 21-0057), with exposed pad not present. Pin 1 is marked by dot; pin numbering follows standard SOT23 orientation (pin 1 top-left, pin 5 bottom-right).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Power Input | Bypass with 0.1µF ceramic capacitor to GND; connects to upstream supply (e.g., PMIC LDO output). |
| 2 (ON) | Active-High Enable | Logic high (>2.0V) enables switch; low (<0.8V) forces shutdown with 0.01µA supply current. |
| 3 (GND) | Ground Reference | Primary return path for load current and internal circuitry; must connect to low-impedance system ground plane. |
| 4 (FLAG) | Fault Indicator Output | Open-drain output; requires external pull-up to IN; asserts low on latch-off events (overcurrent, thermal, UVLO). |
| 5 (OUT) | Switched Load Output | Connects to SDIO VCC line; bypass with 0.1µF ceramic capacitor to GND to suppress turn-off ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Latch-off fault response | Prevents automatic re-engagement during persistent faults - requires explicit ON pin reset, enhancing system safety in SDIO card jam scenarios. |
| Reverse current limiting | 375mA threshold - blocks backfeed from powered peripherals into host supply during unexpected power sequencing. |
| Thermal shutdown | +150°C trip with 15°C hysteresis - protects die during sustained short-circuit events without external sensing components. |
| Undervoltage lockout | 2.2V rising-edge threshold - avoids erratic switching during brown-out or battery sag below functional voltage. |
| Fast current-limit response | 5µs detection latency - interrupts fault current before IC damage or bus collapse in short-circuit conditions. |
Applications
| SDIO Card Power Switching | Mobile Device Battery Protection |
|---|---|
Use Scenario: Hot-plugging microSD cards into smartphones or tablets where sudden capacitive inrush could trigger false overcurrent trips. IC Role / Device Role / Timing Role: Load switch placed between PMIC and SDIO VCC rail; provides current-limited, blanked enable path with fault flagging. Use Value: 14ms blanking prevents nuisance shutdowns during card insertion; 250mA limit matches SDIO Class 10 spec while allowing margin for transient peaks. |
Use Scenario: Isolating backup battery or auxiliary power rail from main system during fault conditions in handheld medical devices. IC Role / Device Role / Timing Role: Reverse-current blocking switch on secondary power path; monitors bidirectional current flow with independent forward/reverse thresholds. Use Value: 375mA reverse limit prevents battery drain through faulty downstream circuitry; latch-off behavior ensures fault persistence is logged before reset. |
| GPS Module Power Sequencing | PDA Peripheral Port Protection |
Use Scenario: Enabling GPS receiver modules only after baseband processor confirms valid satellite lock, avoiding premature power-on current surges. IC Role / Device Role / Timing Role: Controlled power gate between SoC GPIO and GPS VDD_IO; FLAG signal feeds back to processor for status monitoring. Use Value: 80µA quiescent current extends idle battery life; 0.2Ω RON keeps GPS RF performance stable by minimizing supply droop during acquisition bursts. |
Use Scenario: Safeguarding USB OTG or IrDA ports in legacy PDAs against accidental short circuits caused by cable misinsertion or ESD events. IC Role / Device Role / Timing Role: Primary current-limiting interface between host controller and peripheral connector; integrates UVLO and thermal shutdown. Use Value: 2.3V minimum operating voltage supports aging Li-ion cells down to 3.0V; latch-off mode prevents uncontrolled retry cycles that could damage connectors. |
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 250mA current limit and latch-off behavior, but in 4-pin SOT143 package (no FLAG pin, no reverse current limit). | Lacks FLAG output and reverse current protection - suitable only for simple forward-only load switching where fault visibility is not required. | Select when board space allows larger SOT143 and system-level fault reporting is handled elsewhere. |
| MAX4792EUK+T | Identical 5-pin SOT23 package and 250mA forward limit, but adds autoretry instead of latch-off and omits FLAG output. | Autoretry enables self-recovery from transient faults but removes microprocessor interrupt capability via FLAG. | Choose when automatic recovery from brief shorts is preferred over deterministic fault logging and manual reset control. |
Compared with MAX4791EUK+, MAX4791EUS+T sacrifices fault visibility and reverse protection for smaller footprint, while MAX4792EUK+T trades FLAG-driven diagnostics for autonomous retry - making MAX4791EUK+ optimal for systems requiring precise fault capture and controlled reset in SDIO and portable embedded applications.
Availability
MAX4791EUK+ is available at Aetrix Electronics and suitable for SDIO interface protection, handheld device battery isolation, and GPS module power sequencing requiring stable component supply across industrial temperature range (-40°C to +85°C).
Supply support for MAX4791EUK+ 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 consumer applications.
The MAX4789–MAX4794 family was engineered specifically for robust, low-RON load switching in space-constrained portable electronics - prioritizing fault resilience, minimal quiescent power, and seamless integration with SDIO, USB, and battery-backed subsystems.
FAQ
What is the guaranteed forward current limit of the MAX4791EUK+?
The MAX4791EUK+ 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 per the datasheet's Electrical Characteristics table, ensuring reliable operation in SDIO and other portable load-switching applications without nuisance tripping under nominal load conditions. The MAX4791EUK+ maintains this limit even at 5.5V supply and elevated temperatures.
Does the MAX4791EUK+ provide reverse current protection?
Yes, the MAX4791EUK+ provides reverse current protection with a guaranteed minimum limit of 375mA. When reverse current (from OUT to IN) exceeds this threshold for longer than the 14ms blanking time, the device shuts off and asserts the FLAG output low. This feature prevents backfeed from powered peripherals into the host supply, a critical requirement in multi-rail portable systems where power sequencing is not strictly controlled.
How does the FLAG pin function on the MAX4791EUK+?
The FLAG pin on the MAX4791EUK+ is an open-drain output that asserts low during latch-off events caused by forward/reverse overcurrent, thermal shutdown (+150°C), or undervoltage lockout (<2.2V). It remains high-impedance otherwise and requires an external pull-up resistor to IN. Unlike autoretry variants, FLAG stays latched low until the ON pin is cycled or VIN is reset - enabling unambiguous fault detection and logging in microprocessor-controlled systems.
What package type is used for the MAX4791EUK+?
The MAX4791EUK+ uses a 5-pin SOT23 package (Package Code U5-2, Outline Number 21-0057), RoHS-compliant and lead-free. Pin 1 is marked with a dot; pinout is IN–ON–GND–FLAG–OUT. This compact surface-mount package supports high-density PCB layouts in smartphones, GPS units, and PDAs, and is distinct from the 4-pin SOT143 and 6-pin TDFN variants in the same family.
Can the MAX4791EUK+ be used with a 2.5V supply?
Yes, the MAX4791EUK+ operates reliably from 2.3V to 5.5V, making it fully compatible with 2.5V supply rails. At 2.5V, its on-resistance remains within specification (≤0.4Ω), quiescent current is ~80µA, and logic thresholds (VIH ≥2.0V, VIL ≤0.8V) ensure clean ON pin control. This supports use in low-voltage portable systems such as Bluetooth headsets or wearables where regulated 2.5V LDOs are common.
MAX4791EUK+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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+ FAQ
1.How can I place an order for MAX4791EUK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4791EUK+ 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+ reliable?
The price and inventory of MAX4791EUK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4791EUK+ is usually 5 days.
3.What payment methods are accepted for MAX4791EUK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4791EUK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4791EUK+?
MAX4791EUK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4791EUK+ 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+?
For technical support, including MAX4791EUK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4791EUK+ requirements.
6.How does Aetrix verify that MAX4791EUK+ is sourced from the original manufacturer or authorized distributors?
All MAX4791EUK+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX4791EUK+?
All MAX4791EUK+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4791EUK+, 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+ part is unused and in its original packaging.
Return procedure for MAX4791EUK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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