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Analog Devices Inc./Maxim Integrated MAX8688AHETG+T
- Part No.:
- MAX8688AHETG+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Supply Controllers, Monitors
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX8688AHETG+T.pdf
- Description:
- IC PWR SUPPLY CTRLR/MONTR 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,980
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Product details
Overview
MAX8688AHETG+ from Maxim Integrated is a digital power-supply controller and monitor IC designed to interface with point-of-load (POL) DC-DC converters via REFIN or FB nodes. It delivers 0.2% output-voltage regulation accuracy over line, load, and temperature; features a 12-bit ADC for voltage/current monitoring and a 12-bit DAC for dynamic margining; and supports PMBus™-compliant programming for sequencing, tracking, and fault management in telecom and server power systems.
For engineers reviewing the MAX8688AHETG+ datasheet, MAX8688AHETG+ pinout, MAX8688AHETG+ application, or MAX8688AHETG+ equivalent, this page provides verified technical context, real-world timing and accuracy specifications, validated package and pin-level design meanings, confirmed alternative options with documented functional differences, and supply-chain support details specific to industrial-grade POL control deployments.
Technical Context
The MAX8688AHETG+ implements closed-loop regulation by digitizing RS+/RS− remote-sense voltage and ISN+/ISN− current-sense differential inputs using a 12-bit ADC, then dynamically adjusting DACOUT (12-bit, 0.5mV LSB) to drive the POL's REFIN or FB node. Its internal MAXQ® microcontroller executes programmable soft-start/stop ramp rates, delay timers, and fault response logic (OV/UV/OC/OT/reverse-current) with configurable latch-or-hiccup behavior.
PMBus v1.1 compliance enables full configuration via SCL/SDA, including up to 127 device addressing via A3/A2/A1 pins or software-defined addresses; CLKIO supports master-slave clock synchronization across multiple units; and external EEPROM auto-loading allows field-updatable configurations without hardware changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Accuracy | ±0.2% over line, load, and temperature - ensures stable rail regulation under thermal drift and load transients in multi-rail servers. |
| ADC Resolution | 12-bit - enables precise voltage (RS+/RS−) and current (ISN+/ISN−) telemetry with ≤2.6% current-sense error at +25°C. |
| DAC Resolution & Accuracy | 12-bit, 0.2% accuracy over temperature - supports fine-grained margining (±200mV) and dynamic VOUT adjustment without external calibration. |
| Operating Temperature Range | –40°C to +85°C - qualified for deployment in telecom infrastructure and enterprise server chassis with forced-air cooling. |
| Package | 24-pin TQFN-EP (4mm × 4mm, exposed pad) - compact footprint with low θJC = 2.7°C/W for reliable thermal performance in dense POL layouts. |
| PMBus Address Capacity | Up to 127 devices per bus - enables scalable control of large-scale power systems with centralized firmware management. |
| Fault Response Time | 5ms for overvoltage/overcurrent - fast shutdown prevents downstream component damage during transient faults. |
Pinout & Package
MAX8688AHETG+ uses a lead-free, RoHS-compliant 24-pin TQFN-EP package (4mm × 4mm) with exposed thermal pad connected to AGND for optimal temperature sensing and thermal dissipation (θJC = 2.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DVDD / AVDD | Digital and analog power supplies | Separate 3.3V domains with local 0.1µF decoupling; must be externally tied together for proper biasing. |
| RS+ / RS− | Differential remote-sense inputs | Direct connection to POL output load terminals for accurate voltage regulation independent of PCB trace IR drop. |
| ISN+ / ISN− | Differential current-sense inputs | Interface to sense resistor or DCR network; supports ±10mV to ±40mV differential range with 2.6% accuracy at +25°C. |
| DACOUT | Analog output of internal 12-bit DAC | Drives POL REFIN or FB node via external resistor (RFB); slew rate programmable for controlled margining transitions. |
| ENOUT / FLT | Open-drain control and fault outputs | ENOUT enables/disables POL via EN pin; FLT asserts active-low on OV/UV/OC/OT/reverse-current faults for system interrupt handling. |
| A3/ONOFF | Three-state address MSB / POL on/off control | Hardware-selectable slave address bit; also accepts pulse-triggered turn-on/off commands (min 250µs low, 750µs high). |
| CLKIO | Configurable clock I/O | Can accept external sync clock or output 1MHz master clock (±5% accuracy) to coordinate timing across multiple MAX8688 units. |
Key Features
| Feature | Design Value |
|---|---|
| 0.2% closed-loop voltage regulation | Maintains POL output within ±0.2% tolerance across –40°C to +85°C, eliminating need for manual trim or external compensation. |
| Programmable soft-start/stop ramp rates | Prevents inrush current and ESD stress during power-up/down by controlling dV/dt based on COUT, ILOAD, and ILIMIT constraints. |
| Integrated temperature sensor | ±3°C accuracy over –40°C to +100°C on exposed pad - enables board-level thermal monitoring without external sensors. |
| Master-slave clock synchronization | Eliminates need for external clock generator; one MAX8688 can drive CLKIO outputs to synchronize timing-critical sequencing across 127 devices. |
| EEPROM auto-configuration on power-up | Loads saved PMBus settings from external I²C EEPROM, enabling field-reprogrammable behavior without host intervention or firmware updates. |
Applications
| Telecom Line Cards | Server CPU/GPU VRMs |
|---|---|
Use Scenario: High-density line cards requiring precise, sequenced 12V/5V/3.3V/1.8V rails with real-time telemetry and fault logging. IC Role / Device Role / Timing Role: Digital controller managing up to 26 POLs per unit via hardwired addressing; coordinates startup/shutdown timing with sub-millisecond resolution. Use Value: Enables deterministic power sequencing across mixed-voltage ASIC/FPGA banks while capturing current/voltage/temperature data for predictive maintenance. | Use Scenario: Multi-phase VRMs powering CPUs and GPUs in rack-mounted servers where rail accuracy directly impacts compute stability and thermal headroom. IC Role / Device Role / Timing Role: Closed-loop regulator correcting POL output in real time using DACOUT feedback to REFIN, compensating for load-step-induced droop and thermal drift. Use Value: Delivers ±0.2% regulation accuracy - tighter than standard 1% POL specs - reducing voltage guard-banding and improving power efficiency at full load. |
| Industrial PLC Power Modules | High-Reliability Network Switches |
Use Scenario: Programmable logic controllers operating in extended temperature environments (-40°C to +85°C) with strict uptime requirements and field-service constraints. IC Role / Device Role / Timing Role: Fault manager detecting overtemperature, reverse current, and undervoltage events; triggers hiccup-mode recovery or latched shutdown per configurable policy. Use Value: Replaces costly field recalls with remote PMBus reconfiguration - e.g., updating margin thresholds or fault response modes without hardware access. | Use Scenario: Carrier-grade Ethernet switches with hot-swappable line cards needing synchronized power enable/disable and shared current monitoring across redundant power paths. IC Role / Device Role / Timing Role: Master-slave clock coordinator ensuring nanosecond-aligned sequencing across distributed MAX8688 units on separate PCBs via CLKIO daisy-chain. Use Value: Eliminates timing skew between power rails feeding SERDES lanes, preventing link training failures during card insertion/removal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital power-supply controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8689AEVKIT# | Development kit for MAX8689 - not a direct replacement IC; includes GUI, cables, and reference schematics for evaluation only. | Used for prototyping and validation; lacks production-grade qualification, thermal rating, or long-term supply assurance. | Select only for design-in evaluation; MAX8688AHETG+ remains required for volume production due to distinct register map and PMBus command set. |
| LM25069A | Hot-swap controller with integrated MOSFET drivers and current limiting - no DAC, ADC, PMBus, or closed-loop regulation capability. | Provides inrush protection and overcurrent shutdown only; cannot perform voltage margining, sequencing, or telemetry. | Choose LM25069A only for simple rail enable/control; MAX8688AHETG+ is necessary when closed-loop regulation, multi-rail coordination, or digital telemetry are required. |
Compared with MAX8688AHETG+, the MAX8689AEVKIT# serves exclusively as an evaluation platform-not a functional substitute-while the LM25069A offers basic power-path protection but lacks all digital control, monitoring, and regulation features essential for advanced POL management.
Availability
MAX8688AHETG+ is available at Aetrix Electronics and suitable for telecom networking equipment, server power delivery subsystems, and high-reliability infrastructure requiring stable component supply, long-lifecycle availability, and guaranteed RoHS-compliant sourcing.
Supply support for MAX8688AHETG+ 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 and mixed-signal ICs for power, sensing, and communication applications, with emphasis on high-reliability industrial and infrastructure markets.
The MAX8688 product line delivers digital power-supply control and monitoring for point-of-load converters, targeting applications demanding tight voltage regulation, multi-rail sequencing, and PMBus-based system-level power management.
FAQ
What is the primary function of the MAX8688AHETG+ in a power system?
The MAX8688AHETG+ functions as a digital power-supply controller and monitor that interfaces with point-of-load (POL) DC-DC converters to provide closed-loop voltage regulation, sequencing, margining, and telemetry. It achieves ±0.2% output-voltage accuracy over line, load, and temperature by digitizing RS+/RS− and ISN+/ISN− signals and dynamically adjusting DACOUT to drive the POL's REFIN or FB node - all managed via PMBus commands. This makes MAX8688AHETG+ ideal for telecom and server applications requiring precise, programmable power control.
How does the MAX8688AHETG+ achieve 0.2% voltage regulation accuracy?
The MAX8688AHETG+ achieves 0.2% voltage regulation accuracy through a closed-loop architecture: its 12-bit ADC continuously samples the differential RS+/RS− remote-sense voltage, and its 12-bit DAC adjusts DACOUT in 0.5mV steps to correct deviations from the target VOUT_COMMAND. Regulation is maintained across –40°C to +85°C with no external calibration required. The MAX8688AHETG+ also supports programmable correction rates up to 10kHz and compensates for PCB trace resistance via true remote sensing - ensuring accuracy regardless of layout parasitics.
What are the key differences between REFIN mode and FB mode operation for the MAX8688AHETG+?
In REFIN mode, the MAX8688AHETG+ drives the POL's reference input directly via DACOUT, enabling full control over soft-start, soft-stop, and margining transitions. In FB mode, it injects current into the POL's feedback node through an external RFB resistor, relying on the POL's internal soft-start circuitry. REFIN mode provides superior regulation and transition control; FB mode is used when REFIN is unavailable but requires careful RFB selection and disables VOUT_TRANSITION_RATE programming. Both modes maintain ±0.2% regulation accuracy using RS+/RS− sensing.
Can the MAX8688AHETG+ monitor output current, and what is its accuracy?
Yes, the MAX8688AHETG+ monitors output current via its ISN+/ISN− differential inputs, supporting both shunt resistors and DCR sensing. Current measurement accuracy is ±2.6% at +25°C and ±7% over the full –40°C to +85°C range. The device includes programmable scaling (via IOUT_SCALE PMBus command) to convert sensed voltage into calibrated current values, and detects reverse current flow - asserting FLT to signal potential fault conditions such as backfeeding or short circuits.
What package type and thermal characteristics does the MAX8688AHETG+ use?
The MAX8688AHETG+ uses a 24-pin TQFN-EP package (4mm × 4mm) with exposed thermal pad. Its thermal resistance is θJC = 2.7°C/W (junction-to-case) and θJA = 36°C/W (junction-to-ambient, 4-layer board). The exposed pad must be connected to AGND for optimal temperature sensing and thermal performance - it is not intended as the main ground return path. This package enables high-density placement near POLs while maintaining reliable operation up to +85°C ambient.
MAX8688AHETG+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Power Supply Controller/Monitor
- Voltage - Input:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- 6.7 mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TQFN (4x4)
MAX8688AHETG+T FAQ
1.How can I place an order for MAX8688AHETG+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8688AHETG+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 MAX8688AHETG+T reliable?
The price and inventory of MAX8688AHETG+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8688AHETG+T is usually 5 days.
3.What payment methods are accepted for MAX8688AHETG+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8688AHETG+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8688AHETG+T?
MAX8688AHETG+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8688AHETG+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 MAX8688AHETG+T?
For technical support, including MAX8688AHETG+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8688AHETG+T requirements.
6.How does Aetrix verify that MAX8688AHETG+T is sourced from the original manufacturer or authorized distributors?
All MAX8688AHETG+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 MAX8688AHETG+T meets industry standards.
7.What is the process for return or replacement of MAX8688AHETG+T?
All MAX8688AHETG+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8688AHETG+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 MAX8688AHETG+T part is unused and in its original packaging.
Return procedure for MAX8688AHETG+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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