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Analog Devices Inc./Maxim Integrated MAX4789ETT+T
- Part No.:
- MAX4789ETT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Current Regulation/Management
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX4789ETT+T.pdf
- Description:
- IC CURRENT LIMITING 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,549
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Product details
Overview
MAX4789ETT+T from Maxim Integrated is a 200mA forward/reverse current-limited analog power switch in a 6-pin 3mm × 3mm TDFN-EP package, featuring 0.2Ω on-resistance, 14ms guaranteed blanking time, and latch-off fault response. It operates from 2.3V to 5.5V and integrates thermal shutdown, reverse current protection, and undervoltage lockout - designed for SDIO port protection in portable electronics.
For engineers reviewing the MAX4789ETT+T datasheet, MAX4789ETT+T pinout, MAX4789ETT+T application, or MAX4789ETT+T equivalent, key selection criteria include its 200mA current limit (guaranteed min), open-drain FLAG output for fault reporting, latch-off behavior (no autoretry), and TDFN-EP thermal performance with exposed paddle tied to ground.
Technical Context
The MAX4789ETT+T implements dual-direction current limiting using internal sense resistors and reference comparators to detect both forward (IN→OUT) and reverse (OUT→IN) overcurrent conditions. Fault detection triggers after a fixed 14ms blanking window, beyond which the switch latches off and asserts FLAG low.
It lacks autoretry functionality - unlike MAX4790/MAX4792/MAX4794 - requiring manual reset via ON pin toggle or VIN cycling. Its BiCMOS process enables fast 5µs current-limit response and supports 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 | 200mA minimum forward/reverse - ensures reliable SDIO load switching without host damage under fault. |
| On-Resistance | 0.2Ω typical at +25°C - minimizes voltage drop and power loss in battery-powered systems. |
| Blanking Time | 14ms minimum - suppresses false trips during hot-swap transients or capacitive load charging. |
| Supply Range | 2.3V to 5.5V - compatible with Li-ion, USB, and multi-rail portable power domains. |
| FLAG Output | Open-drain, latched low on fault - enables microprocessor interrupt signaling with external pullup to IN. |
| Thermal Shutdown | +150°C trip, +135°C recovery - protects die during sustained short-circuit or high ambient conditions. |
| Shutdown Current | 0.01µA max - critical for ultra-low-power standby states in handheld devices. |
Pinout & Package
MAX4789ETT+T uses a 6-pin 3mm × 3mm TDFN-EP package (Outline 21-0137, Code T633+2) with exposed paddle (EP) for enhanced thermal dissipation. EP must be soldered to a large ground plane; it is not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | FLAG | Open-drain fault indicator - pulled low during latch-off, thermal shutdown, or UVLO; requires external pullup. |
| 2 | GND | Power and signal reference ground - connects to EP for optimal thermal performance. |
| 3 | ON | Active-high enable - high = switch enabled; low = shutdown (0.01µA supply current). |
| 4 | N.C. | No internal connection - must be left unconnected or grounded per layout best practice. |
| 5 | IN | Input power rail - bypass with 0.1µF ceramic capacitor to GND within 5mm. |
| 6 | OUT | Switched output - connects to SDIO port or load; bypass with 0.1µF ceramic capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse Current Protection | 300mA reverse limit - prevents backfeed from powered peripherals into host supply during sleep or fault. |
| Fast Fault Response | 5µs current-limit detection - limits energy delivered during short-circuit events before thermal damage occurs. |
| Undervoltage Lockout | 2.2V rising threshold - avoids erratic switching during brown-out or battery depletion. |
| Latch-Off Mode | 8µA quiescent current in fault state - maintains low power while holding fault condition visible to system controller. |
| TDFN-EP Thermal Performance | θJA = 255.9°C/W (4-layer board) - enables >1.9W continuous dissipation with proper PCB copper area. |
Applications
| SDIO Card Slot Protection | USB OTG Power Switching |
|---|---|
|
Use Scenario: Hot-plugging microSD cards into handheld devices where capacitive inrush and short-circuit faults are common. IC Role / Device Role / Timing Role: Current-limited power switch placed between main PMIC rail and SDIO VCC line. Use Value: Prevents host processor reset or PMIC shutdown during card insertion by limiting fault current to 200mA and asserting FLAG for software recovery. |
Use Scenario: Enabling/disabling 5V VBUS power to peripheral devices in dual-role USB ports. IC Role / Device Role / Timing Role: Load switch controlling VBUS delivery with reverse current blocking when peripheral is powered independently. Use Value: Eliminates need for discrete MOSFET + gate driver + sense resistor; reverse limit of 300mA blocks backfeed from peripheral VBUS to host. |
| GPS Module Power Management | PDA Main Battery Isolation |
|
Use Scenario: Isolating GPS receiver power rail from main system supply to reduce noise coupling and enable independent reset. IC Role / Device Role / Timing Role: Always-on switched rail with FLAG monitoring for GPS firmware fault diagnostics. Use Value: 14ms blanking time avoids false FLAG assertion during GPS cold-start current surge; latch-off holds fault until host initiates recovery. |
Use Scenario: Separating main Li-ion battery from PDA logic rails during deep sleep or battery removal. IC Role / Device Role / Timing Role: Low-leakage (0.01µA shutdown) isolation switch with thermal safety margin. Use Value: Reduces system standby current to sub-µA levels; thermal shutdown prevents overheating if battery connector arcs during hot removal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limit switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4789EUK+T | Same 200mA limit, latch-off, FLAG, but in 5-pin SOT23 package - no exposed paddle, higher θJA (≈140°C/W). | Suitable for space-constrained layouts where thermal mass is less critical; lacks EP for high-duty-cycle loads. | Select MAX4789EUK+T only if board area is tighter than thermal budget allows for TDFN-EP. |
| MAX4791ETT+ | 250mA current limit, same TDFN-EP package, identical pinout and FLAG/latch-off behavior - direct upgrade path. | Used where higher load current (e.g., dual-slot SDIO or faster GPS modules) demands margin beyond 200mA. | Choose MAX4791ETT+ when design requires ≥225mA continuous load with same fault-handling architecture. |
Compared with MAX4789ETT+T, MAX4789EUK+T trades thermal performance for smaller footprint, while MAX4791ETT+ increases current capability without changing interface or fault response - enabling scalable power management across product variants.
Availability
MAX4789ETT+T is available at Aetrix Electronics and suitable for SDIO protection, USB OTG power switching, and GPS module isolation requiring stable component supply, RoHS-compliant packaging, and automotive-grade temperature range support.
Supply support for MAX4789ETT+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 portable, industrial, and communications applications.
The MAX4789–MAX4794 family was developed specifically for robust, low-voltage load switching in battery-powered consumer electronics - emphasizing fault resilience, minimal board area, and seamless integration with microprocessor interrupt systems.
FAQ
What is the guaranteed current-limit threshold for MAX4789ETT+T?
The MAX4789ETT+T guarantees a minimum forward and reverse current limit of 200mA across –40°C to +85°C. This value is tested and specified in the Electrical Characteristics table, with typical short-circuit current limit reaching 300mA. The device enters latch-off mode if this threshold is exceeded for longer than the 14ms blanking period.
Does MAX4789ETT+T support autoretry functionality?
No, MAX4789ETT+T does not support autoretry. It uses latch-off behavior: once a fault is detected after blanking time, the switch remains off and FLAG stays low until the ON pin is cycled low-to-high or VIN is dropped below UVLO (~2.2V). Autoretry is exclusive to MAX4790/MAX4792/MAX4794 variants.
How should the exposed paddle (EP) of MAX4789ETT+T be connected?
The exposed paddle (EP) of MAX4789ETT+T must be soldered to a large PCB ground plane to maximize thermal performance. It is not an electrical signal pin - no voltage or current is intended to flow through EP. Per Maxim's layout guidelines, EP connection reduces θJA by >30% and improves reliability under sustained load conditions.
What is the function of the N.C. pin on MAX4789ETT+T?
Pin 4 of MAX4789ETT+T is marked N.C. (No Connection) and is not internally connected to any circuitry. It may be left floating, tied to GND, or used as a test point - none affects device operation. This pin exists for package compatibility across the MAX4789–MAX4794 family and must not be assumed functional.
Can MAX4789ETT+T be used for reverse-current blocking in USB applications?
Yes, MAX4789ETT+T provides guaranteed 300mA reverse current limit and actively blocks reverse conduction when OUT voltage exceeds IN. This makes it suitable for USB OTG or dual-role ports where peripheral VBUS could backfeed into host power - eliminating need for external Schottky diodes or complex discrete solutions.
MAX4789ETT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Current Limiting
- Sensing Method:
- -
- Accuracy:
- -
- Voltage - Input:
- 2.3V ~ 5.5V
- Current - Output:
- 200mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN (3x3)
MAX4789ETT+T FAQ
1.How can I place an order for MAX4789ETT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4789ETT+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 MAX4789ETT+T reliable?
The price and inventory of MAX4789ETT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4789ETT+T is usually 5 days.
3.What payment methods are accepted for MAX4789ETT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4789ETT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4789ETT+T?
MAX4789ETT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4789ETT+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 MAX4789ETT+T?
For technical support, including MAX4789ETT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4789ETT+T requirements.
6.How does Aetrix verify that MAX4789ETT+T is sourced from the original manufacturer or authorized distributors?
All MAX4789ETT+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 MAX4789ETT+T meets industry standards.
7.What is the process for return or replacement of MAX4789ETT+T?
All MAX4789ETT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4789ETT+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 MAX4789ETT+T part is unused and in its original packaging.
Return procedure for MAX4789ETT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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