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Analog Devices Inc./Maxim Integrated MAX1661EUB
- Part No.:
- MAX1661EUB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1661EUB.pdf
- Description:
- IC INTERFACE SPECIALIZED 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,837
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Product details
Overview
MAX1661EUB from Maxim Integrated is a serial-to-parallel/parallel-to-serial converter and load-switch controller designed to drive N-channel MOSFETs in power-plane switching applications. It features three +28V-tolerant bidirectional I/O pins, SMBus 2-wire interface, 3µA quiescent supply current, and low-power-up output state (outputs low at POR). It is used for point-of-load power-bus switching on notebook computer motherboards.
For engineers reviewing the MAX1661EUB datasheet, MAX1661EUB pinout, MAX1661EUB application, or MAX1661EUB equivalent, this page delivers verified technical context, confirmed pin functions, real-world use scenarios in power sequencing, and validated alternative options for N-channel high-side switch control with SMBus-based configuration.
Technical Context
The MAX1661EUB implements a dual-register SMBus architecture-normal-mode and suspend-mode registers selected via the SMBSUS input-enabling asynchronous power-plane reconfiguration without serial bus latency. Its I/O pins operate as open-drain outputs (for driving N-MOSFET gates) or TTL-level inputs (with +28V tolerance), supporting bidirectional status readback.
It integrates hardware interrupt generation via active-low open-drain ALERT output triggered by I/O state changes or thermal shutdown, plus software START-STOP interrupts. Power-on reset ensures outputs are low, guaranteeing safe default-off behavior for N-channel MOSFETs during system boot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +5.5V - supports single-supply operation across 3.3V and 5V logic domains |
| Quiescent Supply Current | 3µA - enables ultra-low-power operation in battery-powered systems like notebooks |
| I/O Pin Voltage Tolerance | +28V - allows direct interfacing with battery-distribution switches without level-shifting |
| Power-On Reset State | Outputs low - ensures N-channel MOSFETs remain off at startup for safe power sequencing |
| SMBus Address Options | 0100000 (ADD = GND), 0111100 (ADD = high-Z), 1001000 (ADD = VCC) - three configurable slave addresses |
| Operating Temperature | -40°C to +85°C - qualified for industrial and mobile computing environments |
| Package | 10-pin µMAX - 3mm × 3mm surface-mount package with exposed pad for thermal performance |
Pinout & Package
The MAX1661EUB is housed in a 10-pin µMAX package (3mm × 3mm, 0.5mm pitch), thermally enhanced with an exposed die-pad. Pin 1 is located at the top-left corner when the marking dot is oriented top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Supply input | Connects to +2.7V–+5.5V system rail; powers internal logic and I/O drivers |
| I/O1 (Pin 2) | Bidirectional I/O | Open-drain output / TTL input; drives N-MOSFET gate or reads external signal; withstands +28V |
| I/O2 (Pin 3) | Bidirectional I/O | Same function and rating as I/O1; enables independent control of second power plane |
| I/O3 (Pin 4) | Bidirectional I/O | Same function and rating as I/O1/I/O2; supports triple-load switching or status monitoring |
| GND (Pin 5) | Ground reference | Primary return path; must be connected to system ground plane for stable operation |
| ADD (Pin 6) | Address select | Three-state input (GND/high-Z/VCC) sets SMBus slave address at power-up only |
| SMBSUS (Pin 7) | Suspend mode control | Asynchronously selects between normal/suspend data registers to avoid SMBus latency |
| SMBDATA (Pin 8) | SMBus bidirectional data | Open-drain serial data line; requires external pull-up; supports multi-master arbitration |
| SMBCLK (Pin 9) | SMBus clock input | Schmitt-triggered clock input; accepts DC to 100kHz; defines timing for all SMBus transfers |
| ALERT (Pin 10) | Interrupt output | Active-low open-drain fault indicator; asserts on I/O change or thermal shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Dual SMBus register bank | Normal and suspend-mode registers enable zero-latency power-plane reconfiguration via SMBSUS pin |
| +28V-tolerant I/O pins | All three I/Os withstand up to +28V, eliminating external protection components when controlling battery switches |
| Hardware + software interrupt support | ALERT pin provides immediate fault signaling; START-STOP software interrupt avoids dedicated interrupt wiring |
| Thermal shutdown protection | Triggers at +140°C and asserts ALERT; unmaskable safeguard against overtemperature failure |
| Ultra-low 3µA supply current | Enables always-on monitoring in battery-backed systems without significant drain |
Applications
| Power-Plane Switching | Point-of-Load Power-Bus Switching |
|---|---|
Use Scenario: Sequencing multiple voltage rails (e.g., +12V, +5V, +3.3V) during system boot in notebook computers. IC Role / Device Role / Timing Role: Load-switch controller that enables/disables N-channel high-side MOSFETs under SMBus command, enforcing strict power-up order. Use Value: Prevents back-feeding and latch-up by ensuring downstream rails power only after upstream sources stabilize. |
Use Scenario: Dynamically enabling/disabling power to peripheral modules (e.g., USB ports, PCIe slots) based on usage state. IC Role / Device Role / Timing Role: Serial-to-parallel converter translating SMBus commands into parallel I/O states to gate local power delivery. Use Value: Reduces BOM count and PCB area versus discrete GPIO expanders while maintaining precise per-rail control. |
| Notebook Computer Battery Distribution | Smart Battery Management Systems |
Use Scenario: Controlling battery-pack isolation switches to manage charge/discharge paths and prevent reverse current flow. IC Role / Device Role / Timing Role: High-voltage tolerant I/O driver managing battery voltage distribution with real-time status feedback via SMBus readback. Use Value: +28V I/O rating allows direct connection to Li-ion battery stacks (up to 4S), eliminating level-shifters and reducing failure points. |
Use Scenario: Enabling/disabling charging circuits or fuel-gauge communication lines in smart battery packs compliant with SMBus Battery Data Specification. IC Role / Device Role / Timing Role: SMBus slave device providing programmable switch control and thermal/fault status reporting to host battery manager. Use Value: Integrates interrupt-driven fault detection (thermal, overcurrent) with standardized SMBus interface for seamless system integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load-switch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1662EUB | Outputs high-impedance at power-up; intended for P-channel MOSFETs; same pinout and SMBus interface | Used where default-off state requires high-Z (not low) to ensure P-MOSFET remains off until configured | Select MAX1662EUB only when driving P-channel high-side switches; not drop-in compatible due to POR state mismatch |
| TPS22965DSGR | Single-channel, 5.5V-rated load switch with integrated FET; no SMBus interface; fixed ON/OFF control via EN pin | Lacks serial configurability, register readback, and multi-rail coordination; suited for simple on/off control | Choose TPS22965DSGR for cost-sensitive, single-rail applications without need for SMBus-based sequencing or status monitoring |
Compared with MAX1662EUB and TPS22965DSGR, the MAX1661EUB uniquely combines N-MOSFET drive capability, +28V I/O tolerance, dual-register SMBus control, and ultra-low 3µA quiescent current-making it irreplaceable for multi-rail, battery-aware power sequencing in space-constrained portable systems.
Availability
MAX1661EUB is available at Aetrix Electronics and suitable for notebook computer motherboard design, point-of-load power management, and smart battery distribution systems requiring stable component supply across extended product lifecycles.
Supply support for MAX1661EUB 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 MAX1661EUB belongs to Maxim's SMBus-compatible load-switch controller family, engineered specifically for reliable, low-power, multi-rail power sequencing in battery-powered computing platforms.
FAQ
What is the power-on reset behavior of the MAX1661EUB?
The MAX1661EUB powers up with all three I/O outputs driven low. This ensures N-channel MOSFETs remain fully off during system initialization, preventing unintended power delivery and enabling safe, controlled power-plane sequencing. The low-POR state is intrinsic to the MAX1661EUB design and differs from the high-impedance POR of MAX1662EUB/MAX1663EUB.
Can the MAX1661EUB drive P-channel MOSFETs?
No-the MAX1661EUB is specifically intended for N-channel MOSFETs, as confirmed by its low-POR output state and internal drive architecture. Driving P-channel devices would require high-impedance or high-POR behavior to ensure turn-off at startup, which is implemented in the MAX1662EUB/MAX1663EUB variants-not the MAX1661EUB.
What is the maximum voltage the I/O pins of the MAX1661EUB can tolerate?
The I/O1, I/O2, and I/O3 pins of the MAX1661EUB withstand up to +28V relative to GND, as specified in the Absolute Maximum Ratings table. This rating enables direct interfacing with battery-distribution circuits in notebook computers without external clamping or level-shifting components.
How does the SMBSUS pin affect MAX1661EUB operation?
The SMBSUS pin on the MAX1661EUB asynchronously selects between two internal data registers: driving SMBSUS low activates the suspend-mode register, while high selects the normal-mode register. This allows instantaneous power-plane reconfiguration without waiting for SMBus transaction completion-reducing latency in dynamic power management.
Does the MAX1661EUB support thermal shutdown protection?
Yes-the MAX1661EUB includes built-in thermal shutdown that triggers at +140°C and asserts the open-drain ALERT pin. This fault condition is unmaskable and provides hardware-level protection against overheating, complementing its overcurrent detection and SMBus-readback capability for full-system thermal monitoring.
MAX1661EUB 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:
- Obsolete
- Applications:
- Controller
- Interface:
- SMBus
- Voltage - Supply:
- 2.7V ~ 5.5V
- Supplier Device Package:
- 10-uMAX/uSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
MAX1661EUB FAQ
1.How can I place an order for MAX1661EUB through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1661EUB 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 MAX1661EUB reliable?
The price and inventory of MAX1661EUB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1661EUB is usually 5 days.
3.What payment methods are accepted for MAX1661EUB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1661EUB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1661EUB?
MAX1661EUB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1661EUB 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 MAX1661EUB?
For technical support, including MAX1661EUB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1661EUB requirements.
6.How does Aetrix verify that MAX1661EUB is sourced from the original manufacturer or authorized distributors?
All MAX1661EUB 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 MAX1661EUB meets industry standards.
7.What is the process for return or replacement of MAX1661EUB?
All MAX1661EUB units undergo pre-shipment inspection (PSI). If there is an issue with MAX1661EUB, 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 MAX1661EUB part is unused and in its original packaging.
Return procedure for MAX1661EUB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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