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Analog Devices Inc./Maxim Integrated MAX4794ETT+T
- Part No.:
- MAX4794ETT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Current Regulation/Management
- Package:
- -
- Datasheet:
-
MAX4794ETT+T.pdf
- Description:
- IC SWITCH 1X1 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,655
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Product details
Overview
MAX4794ETT+T from Maxim Integrated is a 300mA forward/reverse current-limited load switch in a 6-pin 3mm × 3mm TDFN-EP package, featuring autoretry fault recovery, 0.2Ω on-resistance, 2.3V–5.5V operation, and 14ms blanking time-designed for SDIO port protection in handheld devices.
For engineers reviewing the MAX4794ETT+T datasheet, MAX4794ETT+T pinout, MAX4794ETT+T application, or MAX4794ETT+T equivalent, key selection criteria include guaranteed 300mA current limit, autoretry behavior (vs. latch-off), thermal shutdown at +150°C, reverse current protection, and TDFN-EP thermal performance with exposed paddle grounding.
Technical Context
The MAX4794ETT+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 a 14ms blanking period before action, preventing false trips during hot-swap transients.
Unlike latch-off variants (e.g., MAX4793), the MAX4794ETT+T enters autoretry mode: after blanking, it turns off for ~98ms (tRETRY), then re-enables; this cycle repeats until the overload clears. It also integrates undervoltage lockout (2.2V rising threshold), thermal shutdown (+150°C), and reverse current limiting up to 450mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit (Forward) | 300mA min - guarantees safe power delivery to SDIO peripherals without external fusing |
| On-Resistance | 0.2Ω typ at +25°C - minimizes voltage drop and power loss at full rated load |
| Supply Voltage Range | 2.3V to 5.5V - supports single-supply operation across Li-ion, USB, and regulated 3.3V rails |
| Blanking Time | 14ms min - suppresses false faults during capacitive load insertion or power-up surges |
| Retry Time | 98ms typ - enables automatic recovery while limiting average power dissipation during sustained shorts |
| Thermal Shutdown | +150°C with 15°C hysteresis - protects die integrity under continuous overload or poor PCB thermal design |
| Shutdown Current | 0.01µA max - ensures negligible battery drain when disabled in portable systems |
Pinout & Package
MAX4794ETT+T uses a 6-pin 3mm × 3mm TDFN-EP package (outline 21-0137, code T633+2) with exposed paddle (EP) that must be soldered to a large ground plane for optimal thermal performance (θJA = 255.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - | No Connection | Not internally connected; no electrical function |
| 2 GND | Ground Reference | Primary return path for supply, load, and internal circuitry; connects to EP for thermal conduction |
| 3 ON | Active-High Enable Input | Logic high (>2.0V) enables switch; low (<0.8V) forces shutdown with 0.01µA quiescent current |
| 4 N.C. | No Connection | Not internally connected; leave unconnected or float |
| 5 IN | Power Input | Connects to source rail; bypass with 0.1µF ceramic capacitor to GND within 5mm |
| 6 OUT | Switched Output | Delivers current-limited power to load; bypass with 0.1µF ceramic capacitor to GND within 5mm |
Key Features
| Feature | Design Value |
|---|---|
| Autoretry Fault Recovery | Enables automatic re-enable after 98ms off-time, eliminating manual reset and improving system resilience to intermittent shorts |
| Reverse Current Protection | Limits reverse current (OUT→IN) to ≤450mA and disables switch if sustained beyond blanking time-prevents backfeeding into source rails |
| Undervoltage Lockout (UVLO) | Disables switching below 2.2V (rising edge), preventing erratic behavior during brown-out or startup |
| Fast Current-Limit Response | 5µs detection latency ensures immediate intervention during short-circuit events, reducing stress on downstream components |
| Thermal-Shutdown Hysteresis | 15°C gap between trip (+150°C) and recovery (~+135°C) prevents oscillation near thermal limit |
Applications
| SDIO Card Slot Protection | USB Peripheral Power Switching |
|---|---|
Use Scenario: Hot-plugging microSD cards into portable GPS units or PDAs where capacitive inrush and misinsertion cause momentary shorts. IC Role / Device Role / Timing Role: Load switch with autoretry and 14ms blanking acts as intelligent fuse between main rail and SDIO interface. Use Value: Prevents host processor reset or rail collapse during card insertion while enabling automatic recovery-no user intervention required. |
Use Scenario: Enabling/disabling power to USB OTG accessories (e.g., keyboards, flash drives) in smartphones to manage battery life and prevent backfeed. IC Role / Device Role / Timing Role: Forward/reverse current-limited switch controls VBUS delivery with reverse current blocking and UVLO supervision. Use Value: Eliminates need for discrete MOSFET + controller + sense resistor; 0.2Ω RON maintains voltage compliance across USB 2.0 spec. |
| Cell Phone Battery Backup Path | Handheld Medical Device Power Management |
Use Scenario: Isolating primary Li-ion battery from backup coin cell or supercapacitor during normal operation, with fail-safe engagement on main rail failure. IC Role / Device Role / Timing Role: Bidirectional current limiter monitors both IN→OUT and OUT→IN paths, asserting fault only after blanking window. Use Value: Enables seamless switchover without damaging backup source or causing system brownout-reverse current limit prevents coin cell discharge. |
Use Scenario: Powering sensor modules (e.g., pulse oximeter, ECG front-end) from regulated 3.3V rail in battery-operated diagnostic tools. IC Role / Device Role / Timing Role: Low-quiescent (80µA), low-RON load switch provides controlled enable/disable with thermal and overcurrent safety. Use Value: Meets IEC 62304 Class B safety requirements via integrated thermal shutdown and current limiting-reducing BOM count and validation effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limit switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4792EUS+T | Same 250mA forward limit, 4-pin SOT143 package, no FLAG pin, autoretry enabled | Lower current rating and smaller footprint; lacks exposed thermal pad | Select when board space is constrained and 250mA suffices; verify thermal margin without EP |
| MAX4794EUS+T | Identical electrical specs and autoretry logic, but in 4-pin SOT143 (no EP, higher θJA = 255.9°C/W) | Same functionality with reduced thermal performance and no exposed paddle | Choose for legacy SOT143 layouts where TDFN rework is impractical; derate power accordingly |
Compared with MAX4794ETT+T, the MAX4792EUS+T offers lower current capacity and no thermal pad, while the MAX4794EUS+T matches all electrical behavior but sacrifices thermal efficiency due to its SOT143 package-making the TDFN-EP variant optimal for sustained 300mA loads in compact, thermally demanding designs.
Availability
MAX4794ETT+T is available at Aetrix Electronics and suitable for SDIO interface protection, USB peripheral power switching, and handheld medical device power management requiring stable component supply, RoHS-compliant packaging, and long-term industrial lifecycle support.
Supply support for MAX4794ETT+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 industrial, automotive, communications, and consumer applications.
The MAX4789–MAX4794 family was developed specifically for robust, low-RON load switching in space-constrained portable electronics-emphasizing fault resilience, bidirectional current control, and minimal external component count.
FAQ
What is the guaranteed forward current limit for MAX4794ETT+T?
The MAX4794ETT+T guarantees a minimum forward current limit of 300mA across -40°C to +85°C. This value is tested and specified per the datasheet's Electrical Characteristics table, with a maximum of 450mA under worst-case conditions. The limit ensures reliable operation in SDIO and USB load-switching applications without external current sensing.
Does MAX4794ETT+T provide reverse current protection?
Yes, MAX4794ETT+T provides reverse current protection with a guaranteed limit of 450mA (max) for reverse current (OUT→IN). If reverse current exceeds this threshold for longer than the 14ms blanking time, the switch disables and remains off until the condition clears-preventing backfeed into source rails in battery-backup or multi-rail systems.
How does the autoretry feature work in MAX4794ETT+T?
In MAX4794ETT+T, autoretry initiates after the 14ms blanking period expires during an overcurrent event: the switch turns off for ~98ms (tRETRY), then automatically re-enables. This cycle repeats until the overload is removed. Unlike latch-off variants (e.g., MAX4793), no ON-pin toggle or power cycle is needed-enabling hands-free recovery in embedded systems.
What is the role of the exposed paddle (EP) in the MAX4794ETT+T TDFN package?
The exposed paddle (EP) in the MAX4794ETT+T TDFN-EP package must be soldered to a large PCB ground plane to maximize thermal performance. It reduces junction-to-ambient thermal resistance (θJA = 255.9°C/W) and prevents thermal shutdown under sustained 300mA loads. EP is not electrically connected-it serves only as a thermal conduction path.
Can MAX4794ETT+T operate from a 2.5V supply?
Yes, MAX4794ETT+T operates across 2.3V to 5.5V, so 2.5V is fully supported. Its undervoltage lockout (UVLO) activates below ~2.2V (rising edge), ensuring stable switching above that threshold. At 2.5V, on-resistance remains low (~0.2Ω typ), and quiescent current stays within 80–120µA-making it suitable for single-cell Li-ion and low-voltage embedded rails.
MAX4794ETT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Product Status:
- Active
- Function:
- -
- Sensing Method:
- -
- Accuracy:
- -
- Voltage - Input:
- -
- Current - Output:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX4794ETT+T FAQ
1.How can I place an order for MAX4794ETT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4794ETT+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 MAX4794ETT+T reliable?
The price and inventory of MAX4794ETT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4794ETT+T is usually 5 days.
3.What payment methods are accepted for MAX4794ETT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4794ETT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4794ETT+T?
MAX4794ETT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4794ETT+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 MAX4794ETT+T?
For technical support, including MAX4794ETT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4794ETT+T requirements.
6.How does Aetrix verify that MAX4794ETT+T is sourced from the original manufacturer or authorized distributors?
All MAX4794ETT+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 MAX4794ETT+T meets industry standards.
7.What is the process for return or replacement of MAX4794ETT+T?
All MAX4794ETT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4794ETT+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 MAX4794ETT+T part is unused and in its original packaging.
Return procedure for MAX4794ETT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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