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Analog Devices Inc./Maxim Integrated MAX1931EUB+
- Part No.:
- MAX1931EUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1931EUB+.pdf
- Description:
- IC SW CUR LIMIT USB 10-UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:198
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Product details
Overview
MAX1931EUB+ from Maxim Integrated is a P-channel MOSFET current-limited power switch for single USB port protection, featuring 0.64A–1.06A preset current limit, 60mΩ typical on-resistance, and 10ms fault-blanking timeout. It operates from 2.7V to 5.5V, draws only 14µA quiescent current, and delivers fault indication via open-drain FAULT pin - ideal for notebook USB ports and hot-plug battery-charger circuits.
For engineers reviewing the MAX1931EUB+ datasheet, MAX1931EUB+ pinout, MAX1931EUB+ application, or MAX1931EUB+ equivalent, key selection criteria include guaranteed short-circuit current limit (750mA min), thermal shutdown at +165°C, undervoltage lockout (2.0V–2.9V), and compatibility with capacitive hot-swap loads up to 150µF.
Technical Context
The MAX1931EUB+ implements a foldback-current-limited P-channel MOSFET switch with replica-based current sensing and a 1.24V internal reference. Its fault detection logic responds to sustained overcurrent (>10ms), thermal overload (+165°C), or UVLO (<2.0V), with immediate FAULT assertion for non-blankable faults.
It uses an internal 10ms timer to suppress transient faults during hot-swap events and power-up, while maintaining precise current regulation via closed-loop control of the main switch gate. The device is unidirectional and requires VIN > VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Limit | 640mA–1060mA min/max; sets maximum safe load current for USB 2.0 compliance and cable integrity. |
| On-Resistance | 60mΩ typ (150mΩ max); determines I²R loss and voltage drop under full load (e.g., 630mV drop at 1.05A). |
| Fault-Blanking Timeout | 10ms typ; prevents false FAULT assertions during hot-swap inrush into 150µF capacitive loads. |
| Supply Voltage Range | 2.7V–5.5V; supports both 3.3V and 5V system rails without level-shifting. |
| Quiescent Current | 14µA typ; enables ultra-low standby power in battery-powered portable equipment. |
| Thermal Shutdown | +165°C junction threshold; protects against sustained short-circuit by cycling ON/OFF until fault removal. |
| UVLO Threshold | 2.0V–2.9V; disables switch output below valid input rail, preventing erratic behavior during brownout. |
Pinout & Package
The MAX1931EUB+ is housed in a 10-pin µMAX package (3mm × 3mm, 0.5mm pitch) with no exposed pad. All IN pins (1,3,9) connect to the P-channel source; all OUT pins (2,4,8,10) connect to the drain; ON (5) is active-low enable; GND (6) is ground reference; FAULT (7) is open-drain fault indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 9 (IN) | P-channel MOSFET source | Input power rail connection; must be bypassed with 1µF ceramic capacitor to GND for stability. |
| 2, 4, 8, 10 (OUT) | P-channel MOSFET drain | Switched output to USB load; requires 0.1µF ceramic capacitor to GND to suppress turn-off ringing. |
| 5 (ON) | Active-low enable input | Logic low enables switch; high-Z state disables output and reduces supply current to 1µA. |
| 6 (GND) | Analog/digital ground | Reference node for internal circuitry and external decoupling; must be low-impedance. |
| 7 (FAULT) | Open-drain fault indicator | Asserts low on thermal shutdown, UVLO, or sustained overcurrent (>10ms); requires 100kΩ pullup to IN. |
Key Features
| Feature | Design Value |
|---|---|
| Foldback short-circuit protection | Limits continuous short-circuit current to 500mA (min), reducing power dissipation and thermal stress during fault. |
| No FAULT during power-up | 10ms blanking timer ensures FAULT remains high-Z at startup, eliminating host MCU initialization conflicts. |
| Accurate current-limit tolerance | ±15% ILIMIT variation across temperature and supply ensures consistent USB port current budgeting. |
| Low off-state leakage | 20nA max OFF switch leakage prevents parasitic discharge of downstream hold-up capacitors. |
| Integrated thermal shutdown | Auto-cycling behavior at +165°C provides fail-safe protection without external thermal sensors or controllers. |
Applications
| USB Port Protection | Notebook System Power Management |
|---|---|
Use Scenario: Protecting a single downstream USB 2.0 port from overcurrent due to faulty peripherals or cable shorts. IC Role / Device Role / Timing Role: Current-limited high-side power switch with fault reporting and thermal safety. Use Value: Enforces USB 2.0 500mA current limit while providing clean FAULT signaling to host controller for graceful error handling. | Use Scenario: Controlling power delivery to USB peripherals in clamshell-form-factor notebooks during lid-open/closed transitions. IC Role / Device Role / Timing Role: Low-quiescent-power enable switch with fast turn-on (<200µs) and controlled inrush management. Use Value: Reduces system standby current by 14µA per port and eliminates hot-swap glitches via 10ms fault blanking. |
| Battery Charger Input Switching | Docking Station Load Management |
Use Scenario: Isolating battery charger IC input from main system rail during charging faults or thermal events. IC Role / Device Role / Timing Role: Fault-aware high-side switch with UVLO and thermal shutdown coordination. Use Value: Prevents charger IC damage by cutting input power before overtemperature occurs, with FAULT signal triggering charger fault recovery. | Use Scenario: Managing power sequencing and fault isolation for multiple USB, audio, and video interfaces in enterprise docking stations. IC Role / Device Role / Timing Role: Independent per-port current limiting and fault reporting for hot-pluggable expansion modules. Use Value: Enables modular design with per-interface fault containment - one failed port does not disable entire dock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limited high-side switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2051BDBVR | 500mA fixed current limit, 120mΩ RON, no fault blanking, 2.7V–5.5V supply | Lacks 10ms blanking and thermal shutdown; FAULT asserts immediately on overcurrent | Choose when simpler fault response suffices and lower cost is prioritized over hot-swap robustness. |
| AP2151WG-7 | 500mA fixed limit, 130mΩ RON, 1.5ms blanking, -40°C to +85°C, SOT-25 | Shorter blanking time, smaller package, but no thermal shutdown or UVLO reporting | Prefer for space-constrained designs where thermal margin is managed externally and faster fault response is acceptable. |
Compared with TPS2051BDBVR and AP2151WG-7, the MAX1931EUB+ uniquely combines 10ms fault blanking, thermal shutdown with auto-retry, and UVLO reporting in a single 10-pin µMAX package - critical for robust USB hot-plug operation in portable systems.
Availability
MAX1931EUB+ is available at Aetrix Electronics and suitable for USB port protection, notebook computer power management, and battery-charger circuit applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX1931EUB+ 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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX1931EUB+ belongs to Maxim's USB power-switch product line, designed specifically to meet USB 2.0 current-limiting, hot-swap reliability, and low-power requirements in portable and embedded host systems.
FAQ
What is the guaranteed current-limit range for the MAX1931EUB+?
The MAX1931EUB+ guarantees a current limit between 640mA (minimum) and 1060mA (maximum) across temperature and supply voltage. This range ensures reliable compliance with USB 2.0 port current specifications while accommodating process and thermal variations. The actual trip point for a given unit falls within this band and is set by internal trimming during manufacturing.
Does the MAX1931EUB+ provide thermal shutdown protection?
Yes, the MAX1931EUB+ includes integrated thermal shutdown that activates at +165°C junction temperature. When triggered, the switch turns off and the FAULT pin asserts low immediately - without fault blanking - enabling rapid system-level thermal response. Recovery occurs automatically after die cools by ~20°C, resulting in pulsed output if the fault persists.
How does the 10ms fault-blanking feature work in the MAX1931EUB+?
The MAX1931EUB+ starts a 10ms internal timer whenever current limiting begins. If the overcurrent condition clears before timeout, FAULT remains high-impedance. Only if the condition persists beyond 10ms does FAULT go low. This prevents false alarms during hot-swap inrush or brief transients, but does not delay response to thermal or UVLO faults.
What is the recommended external pull-up for the FAULT pin of the MAX1931EUB+?
A 100kΩ resistor from the FAULT pin to the IN supply rail is specified in the MAX1931EUB+ datasheet. This value ensures proper logic-high level under normal conditions while allowing sufficient sink current (≥1mA) for reliable low-state detection when FAULT is asserted. Using IN (not VCC) as the pull-up source maintains correct voltage referencing during UVLO events.
Can the MAX1931EUB+ be used in bidirectional power paths?
No, the MAX1931EUB+ is a unidirectional P-channel MOSFET switch. Its architecture requires the input voltage (IN) to be higher than the output voltage (OUT) at all times. Reverse current flow - such as backfeeding from a charged downstream capacitor into the input rail - is not supported and may cause malfunction or damage.
MAX1931EUB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- USB, Peripherals
- Current - Supply:
- 14µA
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX/uSOP
MAX1931EUB+ FAQ
1.How can I place an order for MAX1931EUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1931EUB+ 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 MAX1931EUB+ reliable?
The price and inventory of MAX1931EUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1931EUB+ is usually 5 days.
3.What payment methods are accepted for MAX1931EUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1931EUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1931EUB+?
MAX1931EUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1931EUB+ 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 MAX1931EUB+?
For technical support, including MAX1931EUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1931EUB+ requirements.
6.How does Aetrix verify that MAX1931EUB+ is sourced from the original manufacturer or authorized distributors?
All MAX1931EUB+ 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 MAX1931EUB+ meets industry standards.
7.What is the process for return or replacement of MAX1931EUB+?
All MAX1931EUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1931EUB+, 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 MAX1931EUB+ part is unused and in its original packaging.
Return procedure for MAX1931EUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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