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11-05-2016

12A Ultrathin μModule Regulator Configurable as Quad, Triple, Dual or Single Output Can Be Placed on Backside of PCB

Linear Technology » LTM4643

Linear Technology Corporation introduces the LTM4643 quad output step-down μModule® (power module) regulator, configurable as a single output (12 A), dual (6 A & 6 A or 9 A & 3 A), or quad (3 A each) regulator in a 9 mm × 15 mm × 1.82 mm ultrathin LGA package. This flexibility enables system designers to rely on one simple and compact μModule regulator for a variety of voltage and load current requirements in FPGA, GPU, ASIC and processor-based applications. The 1.82 mm height ultrathin package allows the LTM4643 to be mounted on the backside of the PCB, freeing space on the topside for components such as memory and connectors. The LTM4643 is suitable for systems with height restrictions, such as backside PCB assembly in PCIe applications and where the regulator must fit under a common heat sink or cold plate to cool high power FPGAs, GPUs, ASICs and processors in applications such as embedded computing, data storage, medical imaging and industrial systems.

Linear Technology - LTM4643

Only eight external ceramic capacitors (1206 or smaller case sizes) and four feedback resistors (0603 case size) are required to regulate four independently adjustable outputs between 0.6 V to 3.3 V. Separate input pins enable powering of the four channels from different or a common supply rail(s) from 4 V to 20 V.

Linear Technology - LTM4643

The four channels are switched 90° out-of-phase to minimize input ripple at the 1.2 MHz default switching frequency or synchronized to an external clock between 850 kHz and 1.5 MHz. With the addition of an external bias supply above 4 V, the LTM4643 can regulate from an input supply voltage as low as 2.375 V. Output overvoltage, overcurrent and overtemperature fault protection are included in the regulator.

1.5 V Output Efficiency and Power Loss (Each Channel)
1.5 V Output Efficiency and Power Loss (Each Channel).

The LTM4643 is available with operation specified over the –40 °C to 125 °C internal temperature range. The μModule regulator is available for immediate delivery from stock, priced starting at $19.90 each for 1,000-piece quantities.

The DC2453A Demonstration Circuit with LTM4643 μModule
The DC2453A Demonstration Circuit with LTM4643 μModule.

Summary of Features: LTM4643

  • Configurable Output Array
  • 4 V to 20 V Input (2.375 V to 20 V with External Bias)
  • 0.6 V to 3.3 V Output Voltage
  • ±1.5% Total Output Voltage Regulation
  • 9 mm × 15 mm × 1.82 mm LGA Package

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