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Analog Devices Inc./Maxim Integrated MAX4766BETA+
- Part No.:
- MAX4766BETA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX4766BETA+.pdf
- Description:
- PROG CURRENT-LIMIT SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:413
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Product details
Overview
MAX4766BETA+ from Maxim Integrated is a latch-off programmable current-limit switch designed for power-path protection in portable 2.25V–4.5V systems. It delivers ±10% accurate current limiting from 0.075A to 1.5A, features adjustable soft-start (1ms min, capacitor-programmable), programmable blanking time (1–150ms), and reverse-current blocking (<1µA). It is used in SDIO ports and cell phone battery-switch applications where fault latching and precise overcurrent response are required.
For engineers reviewing the MAX4766BETA+ datasheet, MAX4766BETA+ pinout, MAX4766BETA+ application, or MAX4766BETA+ equivalent, this page provides verified functional identity, confirmed TDFN-8 package mapping, validated FLAG behavior under latch-off mode, thermal shutdown timing at +150°C, and real-world soft-start/blanking capacitor design relationships - all specific to the MAX4766B variant.
Technical Context
The MAX4766BETA+ implements a proprietary control topology with internal bandgap reference and V-to-I conversion to achieve ±10% current-limit accuracy across -40°C to +85°C. Its latch-off response is triggered only after load current exceeds the SETI-programmed threshold for longer than the SETB-configured blanking interval - no autoretry or continuous limiting occurs.
It integrates reverse-current detection that disables the switch and asserts FLAG immediately upon VOUT > VIN + 100mV, independent of blanking time. Thermal shutdown activates at +150°C junction temperature with 15°C hysteresis, and recovery requires ON pin toggling - consistent with its latch-off classification per the Selector Guide.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit Range | 0.075A to 1.5A, resistor-programmable via SETI-to-GND (RSETI = 1.5MΩ to ≤75kΩ) |
| Current Limit Accuracy | ±10%, guaranteed over -40°C to +85°C and 2.25V–4.5V supply range |
| Supply Voltage Range | 2.25V to 4.5V; undervoltage lockout at 1.6V–2.0V with 125mV hysteresis |
| Soft-Start Time | Capacitor-programmable via SETS-to-GND; 1ms minimum (floating), up to ~17.5ms typical |
| Blanking Time | Capacitor-programmable via SETB-to-GND; 1ms minimum (floating), up to 150ms typical |
| Fault Response Mode | Latch-off: switch disables and FLAG goes low after blanking timeout; reset requires ON toggle or VIN cycle |
| Thermal Shutdown | Activates at +150°C junction temperature; 15°C hysteresis; requires ON toggle to recover |
| Reverse-Current Blocking | Blocks reverse flow when VOUT > VIN + 100mV; leakage <1µA; FLAG asserts immediately |
Pinout & Package
MAX4766BETA+ is housed in an 8-pin 3mm × 3mm TDFN package (pkg code T833-1) with exposed pad for thermal dissipation. Pin 1 is marked by top-side index area; pin numbering follows standard counter-clockwise layout from index corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SETB | Blanking time adjust | Connect capacitor to GND to set fault-blanking duration (1–150ms); floating = 1ms min |
| 2 – FLAG | Fault indicator output | Open-drain output; pulls low on latch-off fault, reverse current, or thermal shutdown; requires external pullup |
| 3 – SETI | Current limit adjust | Resistor to GND sets ILIM (0.075A–1.5A); short to GND = 1.5A max |
| 4 – OUT | Switch output | Power path output; bypass with ≥2.2µF ceramic capacitor (ESR <0.2Ω) |
| 5 – IN | Power input | 2.25V–4.5V supply input; bypass with ≥2.2µF ceramic capacitor (ESR <0.2Ω) |
| 6 – SETS | Soft-start adjust | Capacitor to GND sets output ramp rate (1–17.5ms typical); floating = 1ms min |
| 7 – ON | Enable control | Active-high logic input; high = switch enabled; toggle required to reset latch-off fault |
| 8 – GND | Ground reference | System ground return; connects to exposed thermal pad |
Key Features
| Feature | Design Value |
|---|---|
| Latch-off overcurrent response | Guarantees single-event shutdown until explicit ON toggle - prevents uncontrolled cycling during persistent faults |
| Programmable blanking time | Eliminates false FLAG assertions during hot-swap transients or capacitive inrush by ignoring faults within user-defined window |
| Reverse-current blocking | Prevents backfeed from output to input when VOUT > VIN + 100mV, protecting upstream sources with <1µA leakage |
| Adjustable soft-start | Controls dV/dt at OUT to limit inrush into large capacitive loads, reducing stress on input supply and trace inductance |
| FLAG fault signaling | Single open-drain output reports all critical conditions (overcurrent, reverse current, thermal shutdown) with defined assertion timing |
| Thermal shutdown with hysteresis | Shuts down at +150°C and holds off until die cools ~15°C - avoids oscillation near thermal limit during sustained overload |
Applications
| SDIO Port Protection | Notebook Main Power Switch |
|---|---|
|
Use Scenario: Hot-plug insertion of SD cards into embedded SDIO host controllers. IC Role / Device Role / Timing Role: Current-limit switch placed between main rail and SDIO VCC line; monitors load current and latches off on short-circuit. Use Value: Prevents system brownout and protects host controller I/O pins by isolating faulty card loads without software intervention. |
Use Scenario: Main 3.3V power delivery to CPU core logic in ultra-thin notebooks. IC Role / Device Role / Timing Role: High-accuracy current limiter in always-on power domain; configured for 1.25A limit with 10ms blanking. Use Value: Enables clean power sequencing and eliminates need for manual fuse replacement after transient overloads. |
| Cell Phone Battery Switch | PDA USB Peripheral Port |
|
Use Scenario: Isolating Li-ion battery from system load during charging or fault conditions. IC Role / Device Role / Timing Role: Bidirectional current monitor and latch-off switch; reverse-current blocking prevents battery discharge through USB port. Use Value: Extends battery life by eliminating parasitic drain and ensures safe hot-plug operation of accessories. |
Use Scenario: Powering USB peripherals (e.g., Bluetooth modules) from PDA host with limited current budget. IC Role / Device Role / Timing Role: Programmable 0.56A current limiter with soft-start to avoid USB enumeration failures due to inrush. Use Value: Guarantees USB compliance by limiting peak current to 500mA while maintaining stable VBUS during plug-in. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limit switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4766AETA+ | Autoretry overcurrent response instead of latch-off; same pinout, package, and programming interface | Suitable for self-clearing faults (e.g., intermittent shorts); not appropriate where persistent isolation is required | Select MAX4766AETA+ only if automatic recovery is acceptable and system firmware can handle retry cycles. |
| MAX4766CETA+ | Continuous current-limit mode (no blanking delay for FLAG assertion); identical package and pinout | Used where immediate fault reporting is needed and thermal management allows sustained current limiting | Choose MAX4766CETA+ when fast FLAG response is prioritized over transient immunity and thermal headroom exists. |
Compared with MAX4766BETA+, MAX4766AETA+ enables autonomous recovery but risks repeated fault stress, while MAX4766CETA+ gives faster fault visibility but lacks blanking-based noise immunity - both require identical PCB layout but differ critically in fault-handling behavior and system-level reset requirements.
Availability
MAX4766BETA+ is available at Aetrix Electronics and suitable for SDIO port protection, notebook main power switching, and cell phone battery isolation requiring stable component supply, full-temperature-range qualification, and long-term production continuity.
Supply support for MAX4766BETA+ 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, computing, and portable applications.
The MAX4766 family targets compact, battery-powered systems needing programmable, high-accuracy current limiting with configurable fault responses - specifically optimized for SDIO, USB, and battery-switch use cases in space-constrained designs.
FAQ
What is the overcurrent response behavior of the MAX4766BETA+?
The MAX4766BETA+ enters latch-off mode when load current exceeds the SETI-programmed threshold for longer than the SETB-configured blanking time. Once latched, the switch remains off and FLAG stays low until the ON pin is toggled high-low-high or the input voltage is cycled. This behavior is fixed for the MAX4766BETA+ variant and cannot be changed via configuration.
How do I calculate the soft-start time for the MAX4766BETA+?
The soft-start time for MAX4766BETA+ is determined by the capacitor value connected from SETS to GND. Use the formula: tSS(ms) = CSETS(nF) × 1. For example, a 10nF capacitor yields ~10ms typical soft-start. Leaving SETS floating selects the 1ms minimum preset. The relationship is linear and validated across -40°C to +85°C.
Does the MAX4766BETA+ provide reverse-current protection, and how does it work?
Yes, the MAX4766BETA+ provides reverse-current protection. When VOUT exceeds VIN by more than 100mV, the internal circuitry disables the switch and asserts FLAG immediately - with no blanking delay. Reverse leakage is limited to <1µA. Recovery occurs automatically when VOUT drops below VIN + 100mV, and FLAG deasserts.
What is the maximum capacitive load the MAX4766BETA+ can drive reliably?
The MAX4766BETA+ supports a maximum output capacitance calculated as CMAX = (IFWD(MIN) × tBLANK) / VIN. For a 0.075A minimum limit and 15ms blanking time at 2.25V, CMAX ≈ 500µF. However, stable operation across full temperature and current range requires a minimum 2.2µF ceramic capacitor (ESR <0.2Ω) at OUT.
Can the MAX4766BETA+ be used with a 1.8V supply?
No, the MAX4766BETA+ requires a minimum 2.25V supply and has undervoltage lockout (UVLO) that disables operation below ~1.6V. At 1.8V, the device will not power up or regulate current. It is specified strictly for 2.25V–4.5V operation, making it unsuitable for 1.8V-only systems without level-shifting or auxiliary biasing.
MAX4766BETA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-WDFN Exposed Pad
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Switch Type:
- General Purpose
- Number of Outputs:
- 1
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- High Side
- Output Type:
- N-Channel
- Interface:
- On/Off
- Voltage - Load:
- 2.25V ~ 4.5V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 1.5A
- Rds On (Typ):
- -
- Input Type:
- Non-Inverting
- Features:
- Status Flag
- Fault Protection:
- Current Limiting (Adjustable), Over Temperature, Reverse Current, Short Circuit, UVLO
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN-EP (3x3)
MAX4766BETA+ FAQ
1.How can I place an order for MAX4766BETA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4766BETA+ 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 MAX4766BETA+ reliable?
The price and inventory of MAX4766BETA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4766BETA+ is usually 5 days.
3.What payment methods are accepted for MAX4766BETA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4766BETA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4766BETA+?
MAX4766BETA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4766BETA+ 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 MAX4766BETA+?
For technical support, including MAX4766BETA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4766BETA+ requirements.
6.How does Aetrix verify that MAX4766BETA+ is sourced from the original manufacturer or authorized distributors?
All MAX4766BETA+ 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 MAX4766BETA+ meets industry standards.
7.What is the process for return or replacement of MAX4766BETA+?
All MAX4766BETA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4766BETA+, 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 MAX4766BETA+ part is unused and in its original packaging.
Return procedure for MAX4766BETA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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