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Analog Devices Inc./Maxim Integrated MAX8688AHETG+
- Part No.:
- MAX8688AHETG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Supply Controllers, Monitors
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX8688AHETG+.pdf
- Description:
- IC PWR SUPPLY CTRLR/MONTR 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:564
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Product details
Overview
MAX8688AHETG+ from Maxim Integrated is a digital power-supply controller and monitor IC designed to manage point-of-load (POL) DC-DC converters via PMBus™. It delivers 0.2% output-voltage regulation accuracy over line, load, and temperature; integrates a 12-bit ADC for voltage/current sensing and a 12-bit DAC for closed-loop margining; and supports sequencing, tracking, soft-start/stop, and fault protection in telecom, server, and high-reliability infrastructure applications.
For engineers reviewing the MAX8688AHETG+ datasheet, MAX8688AHETG+ pinout, MAX8688AHETG+ application, or MAX8688AHETG+ equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to the MAX8688AHETG+ variant.
Technical Context
The MAX8688AHETG+ operates in two primary control modes: REFIN mode (DACOUT drives POL reference input) and FB mode (DACOUT injects into feedback node via resistor). In both, it uses internal 12-bit ADCs with differential amplifiers on RS+/RS− and ISN+/ISN− to monitor output voltage (±0.3% accuracy, −40°C to +85°C) and current (±2.6% accuracy at +25°C), while its 12-bit DAC enables dynamic voltage adjustment with 0.5mV LSB resolution and 0.6 V/µs slew rate.
It implements programmable timing events-including tON_DELAY, tON_RISE, tOFF_DELAY, tOFF_FALL-and supports up to 127 devices on one PMBus bus using software-addressing or hardwired address pins (A3/A2/A1). Fault handling includes overvoltage, undervoltage, overcurrent, reverse-current, and overtemperature detection with configurable responses (no action, latch, hiccup), signaled via open-drain FLT output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Accuracy | ±0.2% over line, load, and temperature - enables precise margining and stable rail regulation without external calibration. |
| ADC Resolution & Channels | 12-bit ADC with dual differential inputs - measures both POL output voltage (RS+/RS−) and output current (ISN+/ISN−) simultaneously with high fidelity. |
| DAC Resolution & Output | 12-bit DAC with 0.5mV LSB and 0.6 V/µs slew rate - provides fine-grained, dynamically adjustable voltage bias for REFIN or FB-mode control. |
| Current Sense Accuracy | ±2.6% at TA = +25°C to +85°C - sufficient for accurate load monitoring and overcurrent protection in high-density power systems. |
| PMBus Address Capacity | Up to 127 unique addresses - allows centralized management of large-scale multi-rail power architectures without address conflict. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and telecom infrastructure environments with extended thermal cycling requirements. |
| Package | 24-pin TQFN-EP (4mm × 4mm, lead-free) - compact footprint with exposed pad for optimal thermal performance and accurate on-die temperature sensing. |
Pinout & Package
The MAX8688AHETG+ is housed in a 24-pin, lead-free, 4mm × 4mm TQFN-EP package with exposed pad (EP) connected to AGND for thermal and temperature-sensing integrity. Pin functions are electrically validated per Maxim's official datasheet Rev 2 (19-3201).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DVDD / AVDD | Digital & analog supply inputs | Both require 3.3V ±10%; must be externally tied together and decoupled with 0.1µF capacitors to respective grounds (DGND/AGND). |
| RS+ / RS− | Differential remote-sense inputs | Connect directly to load terminals to eliminate PCB trace IR drop; enable true load-point voltage regulation within ±0.2%. |
| ISN+ / ISN− | Differential current-sense inputs | Interface to sense resistor or DCR network; support ±10mV to ±40mV differential range with common-mode up to 5.5V. |
| DACOUT | Analog output of internal 12-bit DAC | Drives POL's REFIN pin (REFIN mode) or FB node via RFB (FB mode); 5Ω output impedance, 2mA drive capability. |
| ENOUT / FLT | Open-drain logic outputs | ENOUT controls POL enable/disable; FLT asserts low on fault-both require external pull-ups and interface directly to system controller IRQ lines. |
| A3/ONOFF | Three-state address pin & POL on/off control | Configurable as MSB address bit or hardware POL enable signal; requires ≥750µs high pulse for turn-on, ≥250µs low for turn-off. |
| SCL / SDA | PMBus/SMBus interface signals | Support 100kHz SMBus speed; compatible with standard PMBus command set for configuration, telemetry, and fault logging. |
Key Features
| Feature | Design Value |
|---|---|
| PMBus-compliant digital interface | Enables full remote configuration, real-time telemetry (VOUT, IOUT, TEMP), sequencing, and fault logging without firmware changes. |
| Closed-loop voltage regulation | Maintains ±0.2% output accuracy by dynamically adjusting DACOUT in 0.5mV steps based on ADC readings from RS+/RS−. |
| Programmable soft-start/soft-stop | Configurable tON_RISE/tOFF_FALL ramp rates prevent inrush current and ESD stress during power-up/down across multiple rails. |
| Comprehensive fault protection | Detects OV/UV/OC/Reverse-I/OT with user-selectable response (latch, hiccup, or no action) and dedicated FLT output for system-level interrupt. |
| Master-slave clock synchronization | CLKIO pin supports daisy-chained timing distribution-eliminates need for external clock generator in multi-MAX8688 systems. |
Applications
| Telecom Line Cards | Server CPU/GPU VRMs |
|---|---|
Use Scenario: High-density line cards requiring tight regulation of multiple 12V, 5V, 3.3V, and 1.8V POL rails under dynamic load transients. IC Role / Device Role / Timing Role: Digital controller coordinating startup sequencing, voltage tracking, and real-time margining across 8–16 POLs via single PMBus bus. Use Value: Eliminates manual calibration and reduces board-level test time by enabling automated voltage validation at system boot. |
Use Scenario: Dual-socket servers with complex multi-phase CPU and GPU VRMs needing coordinated power-up, thermal derating, and fault containment. IC Role / Device Role / Timing Role: Monitor and regulate individual VRM outputs using REFIN mode; feed temperature and current data to BMC for predictive thermal management. Use Value: Achieves ±0.2% rail stability under 50A load steps-critical for maintaining CPU frequency and preventing throttling. |
| Industrial PLC Power Modules | High-Availability Network Switches |
Use Scenario: Programmable logic controllers operating in harsh environments where long-term voltage drift and component aging must be compensated. IC Role / Device Role / Timing Role: Closed-loop DAC-based correction continuously adjusts POL reference to counteract aging effects in DC-DC components. Use Value: Extends mean time between failures (MTBF) by detecting gradual output degradation before functional failure occurs. |
Use Scenario: Carrier-grade Ethernet switches with hot-swappable line cards requiring zero-downtime power sequencing and graceful failover. IC Role / Device Role / Timing Role: Enforces strict power-up order (e.g., 3.3V → 1.2V → 1.0V) with programmable delays and monitors each card's current draw for anomaly detection. Use Value: Prevents backfeeding and bus contention during card insertion/removal-ensuring uninterrupted packet forwarding. |
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 |
|---|---|---|---|
| MAX8688BHETG+ | 0.4% output voltage accuracy (vs. 0.2%); same pinout, timing, and feature set. | Suitable where tighter regulation is not required-e.g., auxiliary rails or non-critical I/O supplies. | Select MAX8688BHETG+ only if ±0.4% accuracy meets system spec and cost reduction is prioritized. |
| LM25069A | Hot-swap controller with integrated MOSFET driver and current limiting-but no DAC, ADC, or PMBus telemetry. | Provides inrush control and overcurrent protection only; lacks closed-loop regulation, sequencing, or remote monitoring. | Choose LM25069A when basic power-enable/safety is needed without digital supervision or precision regulation. |
Compared with MAX8688BHETG+, the MAX8688AHETG+ delivers twice the voltage regulation accuracy for critical core rails, while LM25069A serves a fundamentally different function-providing hardware-level fault containment without digital intelligence or telemetry.
Availability
MAX8688AHETG+ is available at Aetrix Electronics and suitable for telecom line cards, server VRMs, industrial PLC modules, and high-availability network switches requiring stable component supply, long-lifecycle support, 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, mixed-signal, and power-management ICs for demanding industrial, communications, and computing applications.
The MAX8688 product line was developed specifically to add digital intelligence, telemetry, and programmable control to legacy analog POL power supplies-enabling migration to smart, PMBus-managed power architectures without redesigning DC-DC stages.
FAQ
What is the key functional difference between MAX8688AHETG+ and MAX8688BHETG+?
The MAX8688AHETG+ guarantees ±0.2% output voltage regulation accuracy over line, load, and temperature, whereas the MAX8688BHETG+ specifies ±0.4%. Both share identical pinout, package, PMBus interface, ADC/DAC resolution, and feature set. The A-grade variant is intended for core processor rails and other high-precision applications where tighter regulation directly impacts system performance or reliability.
Does MAX8688AHETG+ support both REFIN and FB control modes?
Yes, the MAX8688AHETG+ supports both REFIN mode (DACOUT drives the POL's reference input) and FB mode (DACOUT injects into the feedback node via external resistor RFB). REFIN mode provides full control over soft-start, soft-stop, and margining transitions; FB mode relies on the POL's internal soft-start but retains closed-loop regulation and telemetry capabilities.
What is the role of the exposed pad (EP) on the MAX8688AHETG+ package?
The exposed pad (EP) on the MAX8688AHETG+ must be soldered to the AGND plane-not used as the main ground connection-to ensure accurate die temperature measurement and optimal thermal dissipation. Maxim specifies EP connection to AGND for best temperature sensor performance and junction-to-case thermal resistance of 2.7°C/W.
Can MAX8688AHETG+ monitor output current without an external sense resistor?
No-the MAX8688AHETG+ requires either a discrete current-sense resistor or the DC resistance (DCR) of the POL's output inductor to generate the differential voltage sensed at ISN+/ISN−. Its internal amplifier accepts ±10mV to ±40mV differential input; no internal shunt or Hall-effect sensor is integrated.
How does the MAX8688AHETG+ handle overtemperature faults?
The MAX8688AHETG+ includes an internal temperature sensor with ±3°C accuracy across −40°C to +100°C. When overtemperature is detected, it asserts the open-drain FLT pin low and executes the user-programmed fault response-either no action, latching shutdown, or hiccup mode-based on settings in the MFR_OT_FAULT_LIMIT and MFR_OT_WARN_LIMIT registers.
MAX8688AHETG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX8688AHETG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8688AHETG+ 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+ reliable?
The price and inventory of MAX8688AHETG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8688AHETG+ is usually 5 days.
3.What payment methods are accepted for MAX8688AHETG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8688AHETG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8688AHETG+?
MAX8688AHETG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8688AHETG+ 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+?
For technical support, including MAX8688AHETG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8688AHETG+ requirements.
6.How does Aetrix verify that MAX8688AHETG+ is sourced from the original manufacturer or authorized distributors?
All MAX8688AHETG+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX8688AHETG+?
All MAX8688AHETG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8688AHETG+, 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+ part is unused and in its original packaging.
Return procedure for MAX8688AHETG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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