Linear Technology Corporation introduces the LTM4627, a 15A
DC/DC uModule regulator with onboard inductors, MOSFETs, and supporting
components in a 2.6 g, 15 x 15 mm LGA (land grid array) package. Circuit design
enhancements lower gate capacitance MOSFETs and stronger MOSFET drivers enable
the LTM4627 to operate at approximately 7% higher efficiency or to deliver up
to 15 A load current in the same board area and junction temperature as the 10 A
DC/DC uModule regulator. (Comparison conditions: 12 Vin, 1.2 Vout, 10 A
compared to the LTM4600 10 A uModule regulator. The LTM4600 is offered in 15 x
15 x 2.82 mm and LTM4627 in 15 x 15 x 4.32 mm LGA). The LTM4627 can convert
input supplies ranging from 4.5 to 20 V to output voltages from 0.6 to 5 V, regulating
the output with only +/-1.5% total DC output error maximum. Multiple LTM4627
devices can be paralleled for current sharing up to 60A. Applications include medical
imaging systems.
The LTM4627 has an onboard differential remote sense
amplifier to precisely regulate very low voltage, high current loads such as
1.0 V or sub-1 V core voltages of FPGAs and ASICs. Remote sensing corrects
voltage errors caused by the impedance of PCB traces when large current flows
to the load. Output voltage tracking and soft-start features allow controlled
power up and power down of a complex board with multiple power rails. The
device’s PLL (phase-locked loop) function permits users to synchronize the
LTM4627 to a clock frequency from 250 to 780kHz, avoiding a specific frequency
or frequency range that may interfere with sensitive components.