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Analog Devices Inc./Maxim Integrated MAX4793EUK+T
- Part No.:
- MAX4793EUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Current Regulation/Management
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX4793EUK+T.pdf
- Description:
- IC CURRENT LIMITING SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,685
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Product details
Overview
MAX4793EUK+T from Maxim Integrated is a 300mA forward/reverse current-limited load switch in a 5-pin SOT23 package, featuring 0.2Ω on-resistance, 14ms fault-blanking time, and latched FLAG output for SDIO port protection. It operates from 2.3V to 5.5V and provides thermal shutdown, reverse current protection, and undervoltage lockout.
For engineers reviewing the MAX4793EUK+T datasheet, MAX4793EUK+T pinout, MAX4793EUK+T application, or MAX4793EUK+T equivalent, key selection criteria include guaranteed 300mA current limit, latch-off behavior (not autoretry), FLAG assertion timing, and SOT23 footprint compatibility with space-constrained portable designs.
Technical Context
The MAX4793EUK+T implements dual-direction current limiting using internal sense resistors and reference comparators to detect forward (IN→OUT) and reverse (OUT→IN) overcurrent conditions. Fault detection triggers after a guaranteed 14ms blanking period, after which the switch enters latch-off mode and asserts an open-drain FLAG signal.
It lacks autoretry functionality-unlike MAX4794 variants-and requires manual reset via ON pin cycling or input power toggle. Its BiCMOS process enables fast 5µs current-limit response, 40ns turn-off time, and operation across –40°C to +85°C with thermal shutdown at +150°C and 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit | 300mA min forward / 450mA max forward; enables robust SDIO load switching without host damage |
| On-Resistance | 0.2Ω typ at +25°C, 0.5Ω max over full temperature range; minimizes voltage drop and power loss |
| Blanking Time | 14ms min; suppresses false trips during hot-swap transients or capacitive load charging |
| Supply Range | 2.3V to 5.5V; supports single-supply operation across Li-ion, USB, and regulated 3.3V/5V rails |
| FLAG Output | Open-drain, latched low on fault; requires external pullup to IN and signals persistent overcurrent or thermal fault |
| Quiescent Current | 80µA typ at VIN = 3.3V; ensures low standby power in battery-powered handheld devices |
| Shutdown Current | 0.01µA max; enables ultra-low leakage when ON = low, critical for long-term sleep modes |
Pinout & Package
MAX4793EUK+T uses a 5-pin SOT23 package (Package Code U5+2, Outline 21-0057), with exposed paddle not electrically connected. Pin 4 is NC; EP is absent in SOT23.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Switch output terminal; connects to SDIO card or peripheral load; bypass with 0.1µF ceramic capacitor to GND |
| 2 | GND | Ground reference for internal circuitry and current sensing; must be low-impedance connection |
| 3 | ON | Active-high enable input; logic high (>2.0V) turns switch on; low (<0.8V) forces shutdown mode |
| 4 | N.C. | No internal connection; left unconnected on PCB; no routing or termination required |
| 5 | IN | Power input terminal; connects to host supply rail; bypass with 0.1µF ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Latched FLAG output | Asserts low and holds until ON pin or supply is cycled-provides unambiguous fault persistence indication for host microprocessor |
| Reverse current protection | 450mA reverse limit prevents backfeed from powered peripherals into host during sleep or fault states |
| Thermal shutdown | Triggers at +150°C junction temperature with 15°C hysteresis-prevents permanent damage under sustained short-circuit |
| Undervoltage lockout (UVLO) | Disables switch below ~2.0V rising threshold-avoids erratic behavior during brown-out or startup |
| Fast current-limit response | 5µs detection latency enables immediate intervention before transient overcurrent damages downstream components |
Applications
| SDIO Card Slot Protection | USB Peripheral Power Switching |
|---|---|
|
Use Scenario: Hot-plugging microSD cards into portable devices where inrush current may exceed safe limits. IC Role / Device Role / Timing Role: Load switch with current limiting and fault flagging placed between host controller and SDIO bus. Use Value: Prevents host voltage droop and processor reset by limiting peak inrush to ≤300mA and signaling faults via FLAG. |
Use Scenario: Enabling/disabling power to USB-connected accessories (e.g., Bluetooth modules) in smartphones. IC Role / Device Role / Timing Role: Controlled power gate with reverse current blocking and thermal safety for shared VBUS domains. Use Value: Eliminates backfeed into host during accessory removal and avoids thermal runaway during cable shorts. |
| GPS Module Power Management | Handheld Medical Sensor Interface |
|
Use Scenario: Isolating GPS receiver power in battery-operated navigation units to extend runtime and prevent fault propagation. IC Role / Device Role / Timing Role: Current-limited power switch with latch-off behavior ensuring GPS remains disabled after overcurrent until explicit reset. Use Value: Guarantees system stability by preventing GPS fault from resetting main application processor or draining battery. |
Use Scenario: Powering disposable biosensors in point-of-care diagnostic devices where load variability demands strict current control. IC Role / Device Role / Timing Role: Precision load switch with 14ms blanking to tolerate sensor warm-up transients without false shutdown. Use Value: Ensures reliable sensor activation while protecting low-voltage analog front-end from overcurrent-induced damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limit switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4793EUS+T | Same 300mA current limit and latch-off behavior, but in 4-pin SOT143 package (no FLAG pin) | Lacks FLAG output; suitable only where host cannot monitor fault status or relies on other diagnostics | Select when board space allows larger SOT143 and fault visibility is not required |
| MAX4794EUK+T | Identical 300mA limit and SOT23-5 package, but adds autoretry instead of latch-off; FLAG remains functional | Automatically recovers from transient faults without host intervention-reduces firmware complexity | Choose when self-recovery from momentary shorts is preferred over manual reset |
Compared with MAX4793EUK+T, MAX4793EUS+T sacrifices fault visibility for smaller footprint, while MAX4794EUK+T trades deterministic latch-off for autonomous retry-making MAX4793EUK+T optimal for safety-critical or host-controlled reset scenarios.
Availability
MAX4793EUK+T is available at Aetrix Electronics and suitable for SDIO interface protection, portable medical sensor power gating, and GPS module load switching requiring stable component supply, RoHS-compliant packaging, and production-ready lead times.
Supply support for MAX4793EUK+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 engineered specifically for high-reliability load switching in space-constrained mobile platforms-emphasizing fault resilience, low quiescent power, and seamless integration with SDIO, USB, and sensor subsystems.
FAQ
What is the guaranteed current-limit threshold for MAX4793EUK+T?
The MAX4793EUK+T guarantees a minimum forward current limit of 300mA and a maximum of 450mA across its operating temperature range. Reverse current limit is also specified at 450mA. These thresholds are ensured by internal precision sensing and comparator design-not typical values-and remain stable over voltage and temperature variations per the datasheet's Electrical Characteristics table.
Does MAX4793EUK+T support autoretry or latch-off behavior?
MAX4793EUK+T implements latch-off behavior-not autoretry. When a current fault persists beyond the 14ms blanking time, it shuts off and holds the FLAG pin low until the ON pin is cycled (high→low→high) or input power drops below UVLO (~2.0V). This differs from MAX4794 variants, which automatically retry after tRETRY.
What is the function of Pin 4 (N.C.) on MAX4793EUK+T?
Pin 4 on MAX4793EUK+T is designated N.C. (No Connection) and is not internally connected to any circuitry. It must remain unconnected on the PCB-no routing, pullup, pulldown, or grounding is required. This pin exists for mechanical compatibility with other variants in the SOT23-5 footprint family but carries no electrical function in MAX4793EUK+T.
Can MAX4793EUK+T be used with a 1.8V supply?
No-MAX4793EUK+T requires a minimum supply voltage of 2.3V to operate correctly. Its undervoltage lockout activates below ~2.0V, and the ON input logic thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V) assume a ≥2.3V VIN. Using 1.8V violates the Absolute Maximum Ratings and will result in undefined behavior, including failure to turn on or erratic FLAG assertion.
How does the FLAG output of MAX4793EUK+T behave during thermal shutdown?
During thermal shutdown, the FLAG output of MAX4793EUK+T asserts low immediately-without waiting for the 14ms blanking time-as specified in the datasheet. This direct assertion allows the host microprocessor to detect overheating events faster than current-limit faults. FLAG remains latched low until the ON pin or supply is reset, consistent with its latch-off architecture.
MAX4793EUK+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:
- 300mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX4793EUK+T FAQ
1.How can I place an order for MAX4793EUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4793EUK+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 MAX4793EUK+T reliable?
The price and inventory of MAX4793EUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4793EUK+T is usually 5 days.
3.What payment methods are accepted for MAX4793EUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4793EUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4793EUK+T?
MAX4793EUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4793EUK+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 MAX4793EUK+T?
For technical support, including MAX4793EUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4793EUK+T requirements.
6.How does Aetrix verify that MAX4793EUK+T is sourced from the original manufacturer or authorized distributors?
All MAX4793EUK+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 MAX4793EUK+T meets industry standards.
7.What is the process for return or replacement of MAX4793EUK+T?
All MAX4793EUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4793EUK+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 MAX4793EUK+T part is unused and in its original packaging.
Return procedure for MAX4793EUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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