MAX8688
MAX8688
PRODUCTIONDigital Power-Supply Controller/Monitor with PMBus Interface
Complete Control/Monitoring of Any Power Supply with PMBus Interface
- Part Models
- 6
- 1ku List Price
- Starting From $6.36
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Overview
- PMBus Interface for Programming, Monitoring, Sequencing Up and Down, and Accurate Output-Voltage Control
- Controls Output Voltage with 0.2% Accuracy for Line, Load, and Temperature Variations
- Output Voltage, Output Current, and Temperature Monitoring with Adjustable Monitor Rate
- Current Measurement with 2.6% Accuracy
- Programmable Soft-Start and Soft-Stop Ramp Rates
- Controls Up to 26 Power Supplies with Hardwired Address Pins and Up to 127 POLs with Software Addressing
- Compatible with REFIN and FB Terminals of POL Power Supplies
- Protection for POL Against Overvoltage, Undervoltage, Overcurrent, Negative Current and Overtemperature Faults with No Action, Latch and Retry (Hiccup) Options
- Open-Drain Active-Low FLT Signal for Fault Detection
- Master-Slave Clocking Option Eliminates External Clock Requirement and Provides Accurate Timing Reference
- External EEPROM Interface for Auto-Programming on Power-Up
The MAX8688 fully integrated digital power-supply controller and monitor IC works with any existing POL (point-of-load) power supply to provide complete digital programmability. By interfacing to the reference input, feedback node, and output enable, the MAX8688 takes control of the POL to provide functions such as perfect tracking, sequencing, margining, and dynamic adjustment of the output voltage.
The MAX8688 offers an accurate 12-bit analog-to-digital converter (ADC) accompanied with two differential amplifiers for accurately monitoring both voltage and current. An integrated 12-bit digital-to-analog converter (DAC) is also available to margin power supplies as well as dynamically adjust the output voltage with 0.2% accuracy over temperature using this closed-loop system. An internal temperature sensor provides an additional level of system monitoring.
The user-programmable registers provide flexible and accurate control of time events such as a delay time and transition period, monitoring for overvoltage and undervoltage, overcurrent, reverse-current, overtemperature fault and warning handling. The closed-loop operation is also programmable to make sure the MAX8688 works with any existing POL to provide superior regulation accuracy and accurate margining.
The MAX8688 operates using a PMBus™-compliant communication protocol. The device is programmed using this protocol or simply with the use of a free graphic-user interface (GUI) available from the Maxim website that significantly reduces development time. Once the configuration is complete, the results can be saved into an EEPROM or loaded onto the part through the PMBus at power-up. This allows remote configuration of any POL using the MAX8688, replacing expensive recalls or field service. Module current sharing is also supported, since accurate current measurement and fine resolution voltage control are available. The MAX8688 can be programmed with up to 127 distinct addresses to support large systems. The MAX8688 is offered in a space-saving, 24-pin, lead-free 4mm x 4mm TQFN package.
Applications
- DC-DC Modules and POLs
- High-Reliability Infrastructure Equipment
- Servers
- Telecom Networking
Documentation
Data Sheet 1
Technical Articles 2
Device Drivers 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX8688AHETG+ | 24-TQFN-4X4X0.75 | ||
| MAX8688AHETG+T | 24-TQFN-4X4X0.75 | ||
| MAX8688ALETG+ | 24-TQFN-4X4X0.75 | ||
| MAX8688ALETG+T | 24-TQFN-4X4X0.75 | ||
| MAX8688BHETG+ | 24-TQFN-4X4X0.75 | ||
| MAX8688BHETG+T | 24-TQFN-4X4X0.75 |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 20, 2016 - 1612 ASSEMBLY |
||
| MAX8688AHETG+ | PRODUCTION | |
| MAX8688AHETG+T | PRODUCTION | |
| MAX8688ALETG+ | PRODUCTION | |
| MAX8688ALETG+T | PRODUCTION | |
| MAX8688BHETG+ | PRODUCTION | |
| MAX8688BHETG+T | PRODUCTION | |
|
Apr 20, 2026 - 2571D PIN/ERRATA |
||
| MAX8688ALETG+T | PRODUCTION | |
| MAX8688BHETG+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
Evaluation Software 0
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Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Product 3 | ||
| MAX8658 | 1- to 8-Phase, Master-Slave CPU Core Regulator with Integrated Power MOSFETs | |
| MAX8657 | 1- to 8-Phase, Master-Slave CPU Core Regulator with Integrated Power MOSFETs | |
| MAX8659 | 1- to 8-Phase, Master-Slave CPU Core Regulator with Integrated Power MOSFETs | |
| Switching Regulators & Controllers 10 | ||
| MAX8655 | PRODUCTION | Highly Integrated, 25A, Wide-Input, Internal MOSFET, Step-Down Regulator |
| MAX8566 | PRODUCTION | High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator |
| MAX8686 | NOT RECOMMENDED FOR NEW DESIGNS | Single/Multiphase, Step-Down, DC-DC Converter Delivers Up to 25A Per Phase |
| MAX1945 | PRODUCTION | 1MHz, 1% Accurate, 6A Internal Switch Step-Down Regulators |
| MAX8833 | PRODUCTION | Dual, 3A, 2MHz Step-Down Regulator |
| MAX8855 | PRODUCTION | Dual, 5A, 2MHz Step-Down Regulators |
| MAX8643 | PRODUCTION | 3A, 2MHz Step-Down Regulator with Integrated Switches |
| MAX8646 | PRODUCTION | 6A, 2MHz Step-Down Regulator with Integrated Switches |
| MAX8505 | PRODUCTION | 3A, 1MHz, 1% Accurate, Internal Switch Step-Down Regulator with Power-OK |
| MAX1951 | PRODUCTION | 1MHz, All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators |
Tools & Simulations
Software Development 1
Evaluation Kits
Evaluation Kit for the MAX8654 and MAX8688
Evaluation Kit for the MAX8655 and MAX8688
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