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Analog Devices Inc./Maxim Integrated MAX4914AEUK+T
- Part No.:
- MAX4914AEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Current Regulation/Management
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX4914AEUK+T.pdf
- Description:
- IC CURRENT LIMITING SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,279
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Product details
Overview
MAX4914AEUK+T from Maxim Integrated is a latchoff-mode current-limiting load switch IC designed for SDIO and USB port protection in portable electronics. It features 100mA guaranteed forward current limit, 0.2Ω on-resistance at +25°C, 2.3V–5.5V supply range, and 14ms fault-blanking time to suppress hot-swap transients. Used in handheld devices to prevent host damage during faulty load conditions.
For engineers reviewing the MAX4914AEUK+T datasheet, MAX4914AEUK+T pinout, MAX4914AEUK+T application, or MAX4914AEUK+T equivalent, key selection criteria include latchoff behavior (vs. autoretry), 5-pin SOT23 footprint compatibility, reverse current protection, thermal shutdown response, and low 8μA latchoff current for battery-sensitive designs.
Technical Context
The MAX4914AEUK+T implements dual-direction current sensing using internal sense resistors and reference comparators to detect both forward (IN→OUT) and reverse (OUT→IN) overcurrent faults. Its latchoff architecture disables the switch permanently after blanking time expiration and requires ON pin or VIN cycling to reset - no autoretry logic is present.
It integrates undervoltage lockout (UVLO) with 2.0V rising-edge threshold and 100mV hysteresis, thermal shutdown at +150°C with 15°C hysteresis, and open-drain FLAG output that asserts low on fault, UVLO, or thermal trip - all without blanking delay for non-current-limit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Forward Current Limit | 100mA min - guarantees safe current delivery to SDIO/USB loads without host damage |
| On-Resistance | 0.2Ω typ at +25°C - minimizes voltage drop and power loss in 3.3V systems |
| Supply Voltage Range | 2.3V to 5.5V - supports single-cell Li-ion (2.7–4.2V) and 3.3V/5V rail operation |
| Blanking Time | 14ms min - suppresses false FLAG assertion during capacitive load hot-swap transients |
| Latchoff Current | 8μA max - enables ultra-low standby power in battery-powered handhelds |
| Reverse Current Limit | 150mA min - prevents backfeed from OUT to IN during system-level power sequencing |
| Turn-Off Time | 40ns - ensures rapid fault isolation to protect downstream circuitry |
Pinout & Package
The MAX4914AEUK+T is housed in a RoHS-compliant 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable applications. Pin 1 is IN, Pin 2 is GND, Pin 3 is OUT, Pin 4 is FLAG, and Pin 5 is ON - no internal connection at Pin 1 of μDFN variants (not applicable here).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power Input | Accepts 2.3V–5.5V supply; requires local 0.1µF ceramic bypass to GND |
| GND | Ground Reference | Return path for load current and internal bias; must be low-impedance |
| OUT | Switched Load Output | Delivers current-limited power to SDIO/USB peripherals; bypass with 0.1µF to GND |
| FLAG | Open-Drain Fault Indicator | Pulled low on overcurrent, thermal shutdown, or UVLO; requires external pullup to IN |
| ON | Active-High Enable | Logic-high ≥2.0V enables switch; low disables with 0.01µA shutdown current |
Key Features
| Feature | Design Value |
|---|---|
| Latchoff Fault Response | Permanently disables switch after 14ms blanking; requires ON or VIN toggle to recover - eliminates uncontrolled retry cycles in critical systems |
| Reverse Current Protection | 150mA reverse current limit with FLAG assertion - prevents backfeed into host supply during multi-rail power sequencing |
| Thermal Shutdown | +150°C trip with 15°C hysteresis - protects die under sustained short-circuit without external thermal monitoring |
| Low Shutdown Current | 0.01µA typical - extends battery life in always-off states of PDAs and GPS units |
| Fast Current-Limit Response | 5µs detection time - isolates faults before energy dissipation damages PCB traces or connectors |
Applications
| SDIO Card Slot Protection | USB OTG Port Switching |
|---|---|
|
Use Scenario: Hot-insertion of SDIO Wi-Fi or Bluetooth modules into handheld devices causes large inrush currents. IC Role / Device Role / Timing Role: Load switch placed between main PMIC rail and SDIO VCC line; provides current limiting and fault isolation. Use Value: 100mA limit and 14ms blanking prevent false trips during normal card insertion; latchoff ensures host remains protected until user intervention. |
Use Scenario: USB On-The-Go (OTG) ports require bidirectional power control when acting as host or peripheral. IC Role / Device Role / Timing Role: Forward/reverse current-limited switch managing VBUS path between SoC and connector. Use Value: 150mA reverse current limit blocks backfeed from peripheral batteries; FLAG signals fault to SoC for graceful enumeration abort. |
| GPS Receiver Power Management | Cell Phone Camera Module Enable |
|
Use Scenario: GPS receivers draw bursty current during satellite acquisition, risking overcurrent on shared LDO rails. IC Role / Device Role / Timing Role: Dedicated current-limited enable path for GPS RF front-end, decoupled from main application processor supply. Use Value: 0.2Ω RON minimizes voltage droop during 80mA acquisition peaks; latchoff prevents brownout propagation to baseband processor. |
Use Scenario: High-current camera modules (e.g., autofocus actuators) cause transient surges exceeding PMIC limits. IC Role / Device Role / Timing Role: Isolated load switch enabling camera VDD_IO rail only when active, with fault containment. Use Value: 5µs current-limit response cuts off surge before PMIC folds back; 8μA latchoff current preserves battery during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limiting load switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4915AEUK+T | 200mA forward limit, autoretry mode instead of latchoff, same 5-pin SOT23 package | Preferred where automatic recovery from transient overloads is required (e.g., USB charging negotiation) | Select MAX4915AEUK+T if system firmware cannot handle manual latchoff reset; verify FLAG timing aligns with retry cycle. |
| TPS22921YZPR | 1.2A limit, 37mΩ RON, no reverse current limit, no FLAG output, 6-pin WSON | Suitable for high-current, non-fault-reporting applications like display backlight enable | Choose TPS22921YZPR only when higher current capacity and minimal BOM count outweigh need for reverse protection and fault signaling. |
Compared with MAX4914AEUK+T, MAX4915AEUK+T offers higher current headroom and autonomous recovery but sacrifices deterministic fault containment; TPS22921YZPR delivers lower RON and higher current but omits reverse protection, FLAG reporting, and latchoff safety - making MAX4914AEUK+T optimal for SDIO/USB where controlled fault response and compact 5-pin layout are essential.
Availability
MAX4914AEUK+T is available at Aetrix Electronics and suitable for SDIO interface protection, USB OTG port switching, and GPS receiver power management requiring stable component supply across industrial temperature ranges and long-life portable designs.
Supply support for MAX4914AEUK+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 portable, industrial, and communications applications.
The MAX4914B/MAX4915A/B/MAX4917A/B family targets compact, battery-operated devices needing robust load switching with integrated fault protection - specifically engineered for SDIO, USB, and other interface power domains where size, reliability, and low quiescent current are critical.
FAQ
What is the guaranteed forward current limit of the MAX4914AEUK+T?
The MAX4914AEUK+T guarantees a minimum forward current limit of 100mA under all operating conditions across -40°C to +85°C. This value is tested and specified in the Electrical Characteristics table with a typical maximum of 150mA, ensuring reliable protection against overloads in SDIO and USB applications without damaging host circuitry.
Does the MAX4914AEUK+T support reverse current limiting, and what is its threshold?
Yes, the MAX4914AEUK+T provides reverse current limiting with a guaranteed minimum threshold of 150mA when VOUT – VIN ≥ 0.5V. This feature prevents backfeed from peripherals into the host supply during power sequencing or fault conditions, and triggers FLAG assertion if the reverse overload persists beyond the 14ms blanking period.
How does the latchoff behavior of the MAX4914AEUK+T differ from autoretry versions like MAX4915AEUK+T?
The MAX4914AEUK+T enters a permanent latchoff state after fault detection - the switch remains disabled until the ON pin is cycled low-to-high or input voltage drops below UVLO (~2.0V). In contrast, MAX4915AEUK+T automatically retries after a fixed interval. This makes MAX4914AEUK+T appropriate for safety-critical or user-acknowledged fault recovery scenarios.
What is the purpose of the 14ms blanking time in the MAX4914AEUK+T?
The 14ms blanking time in the MAX4914AEUK+T prevents false FLAG assertions during benign transients such as hot-swap inrush into capacitive loads (e.g., SDIO cards). Only overcurrent faults persisting beyond this window trigger latchoff and FLAG activation - ensuring reliable operation during normal system events while maintaining fast 5µs fault detection for true shorts.
Can the MAX4914AEUK+T be used in 1.8V systems?
No, the MAX4914AEUK+T requires a minimum supply voltage of 2.3V and has an undervoltage lockout threshold of ~2.0V (rising edge). Operating below 2.3V violates the Absolute Maximum Ratings and risks undefined behavior; it is not rated for 1.8V logic or supply rails. For lower-voltage applications, consider alternative switches with sub-2V operation.
MAX4914AEUK+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:
- Obsolete
- Function:
- Current Limiting
- Sensing Method:
- -
- Accuracy:
- -
- Voltage - Input:
- 2.3V ~ 5.5V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX4914AEUK+T FAQ
1.How can I place an order for MAX4914AEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4914AEUK+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 MAX4914AEUK+T reliable?
The price and inventory of MAX4914AEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4914AEUK+T is usually 5 days.
3.What payment methods are accepted for MAX4914AEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4914AEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4914AEUK+T?
MAX4914AEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4914AEUK+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 MAX4914AEUK+T?
For technical support, including MAX4914AEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4914AEUK+T requirements.
6.How does Aetrix verify that MAX4914AEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX4914AEUK+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 MAX4914AEUK+T meets industry standards.
7.What is the process for return or replacement of MAX4914AEUK+T?
All MAX4914AEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4914AEUK+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 MAX4914AEUK+T part is unused and in its original packaging.
Return procedure for MAX4914AEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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