50A µModule Regulator Scalable to 250A Runs Cool with Inductors Exposed as Heatsinks

Analog Devices LTM4678

Analog Devices announces the Power by Linear™ LTM4678 dual 25 A or single 50 A step-down µModule® regulator with PMBus digital interface. By stacking and exposing its two inductors on top of BGA package, the LTM4678 uses the inductors as heat sinks to transfer heat from inside, keeping the device cool. On-board EEPROM and PMBus I2C enables a user to measure, alter and record key power parameters such as voltage, load current, temperature and sequencing. Five LTM4678s can current share at 50 A each to deliver up to 250 A to loads such as processors, FPGAs and ASICSs. Applications include PCIe boards, communication infrastructure, cloud computing, optical as well as medical, industrial and test and measurement devices.

Analog Devices - LTM4678

The LTM4678 integrates a DC/DC controller, EEPROM, power FETs, inductors and supporting components in a 16 mm × 16 mm × 5.86 mm BGA package. Output voltage accuracy of ±0.5% is guaranteed over line, load and temperature (–40 °C to 125 °C).

Dual 25 A μModule Regulator with Digital Interface for Control and Monitoring
Dual 25 A μModule Regulator with Digital Interface for Control and Monitoring.

The LTM4678 operates from 4.5 V to 16 V input range, and the two output voltages are digitally controlled from 0.5 V to 3.3 V. The LTM4678 achieves 90% peak efficiency from 12VIN and 0.9VOUT at 50 A. It delivers 40 A at 12VIN to 0.9VOUT at 70 °C ambient with 200 LFM air flow. The switching frequency is 350 kHz to 1 MHz and can be synchronized to an external clock from 350 kHz to 1 MHz for noise sensitive applications.

Output Current Readback, Varying Load Pattern
Output Current Readback, Varying Load Pattern.

The LTM4678’s high power density and scalability make it ideal for the PCB area constraints of densely populated system boards to power the low-voltage & high-current advanced digital devices.

Summary of Features: LTM4678

  • PMBus Digital Interface for Control, Telemetry & Monitoring of Operating Parameters
  • Dual 25 A or Single 50 A Output Current with Current Sharing & Scalable up to 250 A
  • Wide Input Voltage Range: 4.5 V to 16 V
  • Output Voltage Range: 0.5 V to 3.3 V
  • ±0.5% Voltage Set Point Accuracy & ±5% Current Readback Accuracy
  • On-board EEPROM
  • Thermally Enhanced 16 mm × 16 mm × 5.86 mm BGA Package

Pricing & Availability

Product Product Availability Price Each per 1,000 Package
LTM4678 Now Starts at $47.48 Thermally Enhanced
16 mm × 16 mm × 5.86 mm BGA
 
Demonstration Circuit 2552A - Dual 25A or Single 50A μModule Regulator with Digital Power System Management
Demonstration Circuit 2552A – Dual 25A or Single 50 A
μModule Regulator with Digital Power System Management.

JLCPCP: 2USD 2Layer 5PCBs, 5USD 4Layer 5PCBs

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