Description

The MicroRAM output ripple attenuation module combines both active and passive filtering to achieve greater than 40 dB of noise attenuation from 60 Hz to 1 MHz. The MicroRAM operates over a range of 3 to 30 Vdc, is available in either 20 or 30 A models and is compatible with most manufacturers switching converters including Vicor’s VI-200 / VI-J00 and Maxi, Mini and Micro series DC-DC converters.

The MicroRAM’s closed loop architecture greatly improves load transient response and with dual-mode control, provides precise point-of-load voltage regulation. The MicroRAM supports redundant and parallel operation with its integrated ORing diode function.

Input Voltage:
  • 3 – 30 Vdc
Output Current:
  • µRAM2(xxx) 20 A
  • µRAM3(xxx) 30 A
Efficiency:
  • Up to 96%
Dimensions(quarter brick):
  • 2.28″ x 1.45″ x 0.5″(57,9 x 36,8 x 12,7 mm)

  • >40 dB ripple attenuation from 60 Hz to 1 MHz
  • Integrated ORing diode supports N+1 redundancy
  • Significantly improves load transient response
  • User selectable performance optimization
  • Combined active and passive filtering
  • 20 and 30 Ampere ratings

Download Entire Manual

Download Individual Chapters

  1. High Density DC-DC Converter Technology
  2. Control Pin Functions and Applications
  3. Design Requirements
  4. EMC Considerations
  5. Current Sharing in Power Arrays
  6. Thermal Performance Information

Accessory Modules

  1. Autoranging Rectifier Module (ARM)
  2. Filter / Autoranging Rectifier Module (FARM)
  3. Modular AC Front-end System (ENMod)
  4. High Boost HAM
  5. Filter Input Attenuator Module (FIAM)
  6. Output Ripple Attenuator Module (MicroRAM)

Recommended Soldering Methods

  1. Lead Free Pins (RoHS)
  2. Tin Lead Pins

Mounting Options

  1. Surface Mount Socketing System (SurfMate)
  2. Through-hole Socket-mount System (InMate)
  3. Glossary of Technical Terms

  • CE Marked – Low Voltage Directive (2006/95/EC)
  • CE Marked – Low Voltage Directive (2006/95/EC) and RoHS Recast Directive (2011/65/EU)

2-D Micro-size Drawings
Drwg. Number Description Download RoHS
25004 Outline drawing for Micro DC-DC Converter DXF | PDF
3-D Micro-size Module (referring to drawing number 25004)
Micro, short tin / lead pin, slotted baseplate STEP | 3D PDF
Micro, short tin / lead pin, threaded baseplate STEP | 3D PDF
Micro, short tin / lead pin, through-hole baseplate STEP | 3D PDF
Micro, long tin / lead pin, slotted baseplate STEP | 3D PDF
Micro, long tin / lead pin, threaded baseplate STEP | 3D PDF
Micro, long tin / lead pin, through-hole baseplate STEP | 3D PDF
Micro, short ModuMate, slotted baseplate STEP | 3D PDF
Micro, short ModuMate, threaded baseplate STEP | 3D PDF
Micro, short ModuMate, through-hole baseplate STEP | 3D PDF
Micro, long ModuMate, slotted baseplate STEP | 3D PDF
Micro, long ModuMate, threaded baseplate STEP | 3D PDF
Micro, long ModuMate, through-hole baseplate STEP | 3D PDF
Micro, short gold pin (RoHS), slotted baseplate STEP | 3D PDF
Micro, short gold pin (RoHS), threaded baseplate STEP | 3D PDF
Micro, short gold pin (RoHS), through-hole baseplate STEP | 3D PDF
Micro, long gold pin (RoHS), slotted baseplate STEP | 3D PDF
Micro, long gold pin (RoHS), threaded baseplate STEP | 3D PDF
Micro, long gold pin (RoHS), through-hole baseplate STEP | 3D PDF

Design Calculators

These calculator programs allow users to determine values that help with accessory component selection for power system design.

Thermal Calculators

This is a downloadable Excel file.

Description P/N RoHS Technical Drawing
Micro-sized Shield for Slotted Baseplate 30141 PDF | DXF
Micro-sized Shield for Threaded or Through-Hole Baseplate 30143 PDF | DXF

SurfMates - Surface-mount Sockets Image SurfMates – Surface-mount Sockets All SurfMates are RoHS Compatible
Board Thickness Mounting Assembly Drawing Converter Pin Style* Module Style Input
P/N**		 Output P/N** 5 In/Out Sets P/N Technical Drawing
All surface PDF | DXF F Micro 22103 22104 16025
Example of SurfMate Application
* F = Short Gold (RoHS), G = Long Gold (RoHS)
** For individual input / output purchases, a 35-piece minimum (and multiples) applies to Maxis / Minis and a 40-piece minimum (and multiples) for Micros.
InMates - Through Hole Sockets Image InMates – Through-hole All InMates are RoHS Compatible
All sockets are supplied on InMate headers to assure proper alignment during installation.
Board Thickness (nominal) Board Thickness
(min / max)		 Mounting Converter Pin Style* Module Style Input P/N** Output P/N** 5 In/Out Sets P/N Technical Drawing
0.063″ 0.055″ / 0.071″ inboard F Micro 18376 18386 18370 PDF | DXF
0.063″ 0.055″ / 0.071″ onboard G Micro 18380 18392 18372 PDF | DXF
0.094″ 0.084″ / 0.104″ inboard F Micro 18377 18387 18371
0.094″ 0.084″ / 0.104″ onboard G Micro 18381 18393 18373
0.125″ 0.1125″ / 0.1375″ onboard G Micro 21540 21545 21512
Example of Inboard Mounting Options Example of Onboard Mounting Options
* F = Short Gold (RoHS), G = Long Gold (RoHS)
** For individual input / output purchases, a 35-piece minimum (and multiples) applies to Maxis / Minis and a 40-piece minimum (and multiples) for Micros.
Module Exchange Tools
Click img.
to enlarge		 Description Module Style P/N Technical Drawing
Micro Exchange Tool Image Used to facilitate the proper extraction of Micro modules from InMate or SurfMate sockets. Micro 22829 –

Heat Sinks used with Vicor’s Micro-Size Modules
Description P/N RoHS Technical Drawing
Heat Sink - Micro Longitudinal 0.40 0.40″ longitudinal fins, threaded mounting* 32174 PDF | DXF
0.90″ longitudinal fins, threaded mounting* 30190 PDF | DXF
Heat Sink - Micro Longitudinal 0.40 0.40″ longitudinal fins, thru-hole mounting 30719 PDF | DXF
0.90″ longitudinal fins, thru-hole mounting 30183 PDF | DXF
Heat Sink - Micro Transverse 0.40 0.40″ transverse fins, threaded mounting* 32173 PDF | DXF
0.90″ transverse fins, threaded mounting* 30270

PDF | DXF
Heat Sink - Micro Transverse 0.40 0.40″ transverse fins, thru-hole mounting 30722

PDF | DXF
0.90″ transverse fins, thru-hole mounting 30725

PDF | DXF
* NOT for use with threaded baseplates
Heat Sink Thermal Data and Calculator
Low-Profile Side-Fin Heat Sinks (Height only 0.125″ above module baseplate)
Description P/N RoHS Technical Drawing
0.55″ Side-Fin Heat Sink for Micro-Sized Modules 30095 PDF
Heat Sink Thermal Data and Calculator »
ThermMate Thermal Pads (10 pieces per package)
Description P/N Thickness RoHS Technical Drawing
ThermMate Thermal Pads
For use with Vicor Micro-size modules 20265 0.007″ PDF | DXF
* NOT for use with VI-200 or VI-J00 modules