Micro regulator module with precision DC and transient output regulation

A new dual 18A or single 36A µModule (micro module) regulator with high precision output voltage regulation for 28nm and sub-28nm FPGAs, ASICs and microprocessors - the LTM4630-1 has been introduced by Linear Technology. The core voltage of these advanced digital devices requires very accurate voltage regulation at steady state (DC) and at fast load current transients. The LTM4630-1 provides precision output voltage regulation for both conditions: (a) ±0.8% maximum total DC error over line, load and temperature (-40C to 125C) and (b) ±3% total error, including transients, with minimum output capacitance. To power mid to high power 28nm and sub-28nm digital devices, the LTM4630-1 can be used in parallel to current share up to 144A (i.e., 4 devices x 36A). The LTM4630-1 includes a DC-DC regulator, inductors and MOSFETs in a 16mm x 16mm x 5.01mm BGA package. The LTM4630-1 regulates an output voltage ranging from 0.6V to 1.8V and from an input voltage range of 4.5V to 15V. The user can optimize transient response of the LTM4630-1 while reducing output capacitance with an external resistor and capacitor by manipulating the loop response of the µModule regulator. With minimum output ceramic capacitors (five 220µF), the LTM4630-1’s impressive ±3% output voltage regulation window is measured with a 25% load step transient response from 12VIN, while delivering 36A to a 1.2V load. The efficiencies at 12VIN, 1.2VOUT with 20A and 36A load currents are 87.5% and 86%, respectively. Corresponding power loss values are 3.2W and 6.5W, respectively. The LTM4630-1 delivers full 36A current up to 60°C ambient, from 12VIN to 1VOUT with no air flow. Load current derates at approximately 5A per 10C rise in ambient temperature beyond 60C. The LTM4630-1 is offered in two VOUT DC precision grades of ±0.8% and ±1.5%.