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Analog Devices Inc./Maxim Integrated MAX4766AETA+T
- Part No.:
- MAX4766AETA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX4766AETA+T.pdf
- Description:
- 0.075A TO 1.5A, PROGRAMMABLE CUR
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
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Product details
Overview
MAX4766AETA+T from Maxim Integrated is a programmable current-limit switch with ±10% current-limit accuracy, operating from 2.25V to 4.5V supply and supporting 0.075A–1.5A resistor-settable current limit. It features autoretry overcurrent response, adjustable soft-start (5–17.5ms), and blanking time (3.5–11.5ms), designed for SDIO port protection in portable electronics.
For engineers reviewing the MAX4766AETA+T datasheet, MAX4766AETA+T pinout, MAX4766AETA+T application, or MAX4766AETA+T equivalent, key selection criteria include autoretry behavior vs. latch-off/continuous variants, thermal shutdown at +150°C, reverse-current blocking (<1µA), and TDFN-8 (3mm × 3mm) package compatibility with high-density PCB layouts.
Technical Context
The MAX4766AETA+T implements a proprietary control topology that dynamically adjusts gate drive to maintain ±10% current-limit accuracy across temperature (-40°C to +85°C) and supply voltage (2.25V–4.5V). Its autoretry mode uses a two-stage timing sequence: fault detection after programmable blanking time (tBLANK), followed by fixed retry delay (225–700ms) before re-enabling the switch.
It integrates reverse-current protection that disables the switch and asserts FLAG when VOUT > VIN + 100mV, plus thermal shutdown that forces immediate OFF-state with no blanking delay. The device uses external capacitors on SETS (soft-start) and SETB (blanking) pins to set timing parameters, while SETI resistor programs the current limit via RSETI = 112.5kΩ / ILIM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit Range | 0.075A to 1.5A, set by resistor from SETI to GND; ±10% accuracy ensures predictable fault threshold across voltage/temperature. |
| Supply Voltage Range | 2.25V to 4.5V, compatible with single-cell Li-ion and regulated 3.3V rails in portable systems. |
| Soft-Start Time | 5ms to 17.5ms (typ), controlled by capacitor on SETS; limits inrush current during power-up of capacitive loads. |
| Blanking Time | 3.5ms to 11.5ms (typ), set by capacitor on SETB; prevents false fault triggering during hot-swap transients. |
| Overcurrent Response | Autoretry mode: switches OFF for 225–700ms after blanking timeout, then retries; enables self-recovery without host intervention. |
| Thermal Shutdown | Activates at +150°C junction temperature with 15°C hysteresis; protects die during sustained overload or poor heatsinking. |
| Reverse-Current Blocking | Blocks backflow to <1µA when VOUT > VIN + 100mV; prevents battery drain or source contamination in bidirectional power paths. |
Pinout & Package
MAX4766AETA+T is housed in an 8-pin TDFN package (3mm × 3mm, 0.8mm height) with exposed thermal pad, optimized for space-constrained portable designs and efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SETB | Blanking time adjust | Connect capacitor to GND to program fault-blanking duration; floating defaults to 1ms minimum. |
| 2 - N.C. | No connect | Unbonded pin; must remain unconnected per datasheet layout guidance. |
| 3 - SETI | Current-limit programming | Resistor to GND sets ILIM; short to GND yields 1.5A max, 1500kΩ yields 0.075A min. |
| 4 - OUT | Switch output | High-side switched output; requires 2.2µF ceramic bypass capacitor to ground for stability. |
| 5 - IN | Power input | 2.25V–4.5V supply input; bypass with ≥2.2µF ceramic capacitor near pin to suppress transients. |
| 6 - SETS | Soft-start time adjust | Capacitor to GND controls output ramp rate; floating defaults to 1ms minimum soft-start. |
| 7 - ON | Enable control | Active-high logic input; >1.4V turns switch ON, <0.6V forces OFF state. |
| 8 - GND | Ground reference | Primary return path for internal circuitry and external bypass capacitors; connects to exposed thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| ±10% accurate current limit | Ensures consistent trip point across -40°C to +85°C and 2.25V–4.5V supply, reducing design margin uncertainty. |
| Programmable autoretry response | Enables automatic recovery from transient overloads without processor polling or reset sequencing. |
| Adjustable soft-start (5–17.5ms) | Controls dV/dt at OUT to prevent inrush-induced supply droop in SDIO or USB peripheral ports. |
| Adjustable blanking time (3.5–11.5ms) | Suppresses false FLAG assertion during hot-plug events or load capacitance charging surges. |
| Reverse-current blocking (<1µA) | Eliminates backfeed from downstream batteries or supercaps into main supply rail during power loss. |
| Thermal shutdown with hysteresis | Prevents thermal runaway under sustained short-circuit; 15°C hysteresis avoids oscillation near trip point. |
Applications
| SDIO Port Protection | Notebook Power Management |
|---|---|
|
Use Scenario: Protecting SD card slots from short-circuit faults during hot insertion or ESD events. IC Role / Device Role / Timing Role: High-side current-limit switch placed between 3.3V rail and SDIO VCC pin; monitors load current and initiates autoretry on overcurrent. Use Value: Prevents system brownout during card insertion, maintains host CPU operation, and eliminates need for manual reset after fault. |
Use Scenario: Isolating auxiliary power domains (e.g., USB-C PD sink, display backlight) with fault containment. IC Role / Device Role / Timing Role: Programmable current limiter controlling power delivery to non-critical subsystems; responds within 1µs to short-circuit events. Use Value: Enables graceful degradation instead of full-system shutdown; supports dynamic power budgeting via resistor-programmed ILIM. |
| Cell Phone Battery Charging Path | PDA Peripheral Interface |
|
Use Scenario: Managing current flow from battery to USB OTG or accessory power rail during dual-role operation. IC Role / Device Role / Timing Role: Reverse-current blocking switch ensuring battery isolation when VOUT > VIN + 100mV; FLAG signals fault to PMIC. Use Value: Prevents battery discharge into faulty accessories; autoretry allows recovery if short is removed during retry window. |
Use Scenario: Safeguarding expansion ports (CF, MMC) against overcurrent caused by misinserted cards or damaged peripherals. IC Role / Device Role / Timing Role: Current-limiting interface switch with programmable blanking to tolerate card insertion transients. Use Value: Eliminates need for mechanical fuses or complex monitoring firmware; compact TDFN-8 footprint saves board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limit switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4766BETA+T | Latch-off overcurrent response (not autoretry); FLAG asserts after blanking time and remains low until ON is toggled. | Suitable where fault persistence requires explicit host acknowledgment before recovery. | Select MAX4766BETA+T only if system firmware can reliably cycle the ON pin after fault detection. |
| MAX4766CETA+T | Continuous current-limit mode (no blanking delay for FLAG assertion); output clamps at ILIM until load reduces. | Preferred for constant-current loads like LEDs where sustained regulation is required. | Choose MAX4766CETA+T when immediate fault signaling and continuous current limiting outweigh autoretry benefits. |
Compared with MAX4766BETA+T and MAX4766CETA+T, the MAX4766AETA+T uniquely balances autonomous recovery with transient immunity-its autoretry behavior reduces host software overhead while blanking time prevents nuisance trips, making it optimal for unattended portable interfaces.
Availability
MAX4766AETA+T is available at Aetrix Electronics and suitable for SDIO port protection, notebook auxiliary power management, and cell phone battery charging path applications requiring stable component supply and long-term lifecycle support.
Supply support for MAX4766AETA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for portable, industrial, and communications systems.
The MAX4766 family was designed specifically for programmable, high-accuracy current limiting in space-constrained portable electronics, emphasizing autoretry resilience, reverse-current blocking, and minimal external component count.
FAQ
What overcurrent response mode does MAX4766AETA+T use?
The MAX4766AETA+T uses autoretry mode: when load current exceeds the programmed limit for longer than the blanking time, it disables the switch for 225–700ms (retry time), then automatically re-enables. This enables self-recovery without host intervention, distinguishing it from the latch-off (MAX4766BETA+T) and continuous-limit (MAX4766CETA+T) variants.
How is the current limit set on MAX4766AETA+T?
The current limit of MAX4766AETA+T is set by a resistor (RSETI) connected from pin 3 (SETI) to GND. Using RSETI = 112.5kΩ / ILIM, values from 0.075A (1500kΩ) to 1.5A (≤75kΩ) are supported. Shorting SETI to GND yields maximum 1.5A limit with ±10% accuracy across temperature and supply voltage.
Does MAX4766AETA+T provide reverse-current protection?
Yes, MAX4766AETA+T includes reverse-current protection that blocks backflow to <1µA when VOUT exceeds VIN by more than 100mV. The switch turns OFF and FLAG asserts immediately-without waiting for blanking time-to prevent battery drain or source contamination in bidirectional power paths.
What is the purpose of the SETB pin on MAX4766AETA+T?
The SETB pin (pin 1) on MAX4766AETA+T programs the blanking time-a configurable delay that prevents false FLAG assertion during power-up or hot-swap transients. A capacitor from SETB to GND sets blanking time from 3.5ms to 11.5ms; leaving SETB floating selects the 1ms minimum preset value.
What package type and dimensions does MAX4766AETA+T use?
MAX4766AETA+T uses an 8-pin TDFN package (package code T833-1) measuring 3.0mm × 3.0mm × 0.8mm with exposed thermal pad. This compact footprint supports high-density layouts in portable devices while enabling effective thermal dissipation under sustained load conditions.
MAX4766AETA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Switch Type:
- -
- Number of Outputs:
- -
- Ratio - Input:Output:
- -
- Output Configuration:
- -
- Output Type:
- -
- Interface:
- -
- Voltage - Load:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Current - Output (Max):
- -
- Rds On (Typ):
- -
- Input Type:
- -
- Features:
- -
- Fault Protection:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX4766AETA+T FAQ
1.How can I place an order for MAX4766AETA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4766AETA+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 MAX4766AETA+T reliable?
The price and inventory of MAX4766AETA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4766AETA+T is usually 5 days.
3.What payment methods are accepted for MAX4766AETA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4766AETA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4766AETA+T?
MAX4766AETA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4766AETA+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 MAX4766AETA+T?
For technical support, including MAX4766AETA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4766AETA+T requirements.
6.How does Aetrix verify that MAX4766AETA+T is sourced from the original manufacturer or authorized distributors?
All MAX4766AETA+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 MAX4766AETA+T meets industry standards.
7.What is the process for return or replacement of MAX4766AETA+T?
All MAX4766AETA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4766AETA+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 MAX4766AETA+T part is unused and in its original packaging.
Return procedure for MAX4766AETA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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