DESCRIPTION
The LTM®4612 is a complete, ultralow noise, high voltage input and output, 5A switching mode DC/DC power supply. Included in the package are the switching controller, power FETs, inductor and all support components. Operating over an input voltage range of 5V to 36V, the LTM4612 supports an output voltage range of 3.3V to 15V, set by a single resistor. Only bulk input and output capacitors are needed to fi nish the design.
High switching frequency and an adaptive on-time current mode architecture enables a very fast transient response to line and load changes without sacrificing stability. The onboard input filter and noise cancellation circuits achieve low noise coupling, thus effectively reducing the electromagnetic interference (EMI)—see Figures 4 and 8.
Furthermore, the DC/DC μModuleTM can be synchronized with an external clock for reducing undesirable frequency harmonics and allows PolyPhase® operation for high load currents.
The LTM4612 is offered in a space saving and thermally enhanced 15mm × 15mm × 2.8mm LGA package, which enables utilization of unused space on the bottom of PC boards for high density point-of-load regulation. The LTM4612 is Pb-free and RoHS compliant.

FEATURES
■ Complete Low EMI Switch Mode Power Supply
■ CISPR 22 Class B Compliant
■ Wide Input Voltage Range: 5V to 36V
■ 5A DC, 7A Peak Output Current
■ 3.3V to 15V Output Voltage Range
■ Low Input and Output Referred Noise
■ Output Voltage Tracking and Margining
■ PLL Frequency Synchronization
■ ±1.5% Set Point Accuracy
■ Power Good Tracks with Margining
■ Current Foldback Protection (Disabled at Start-Up)
■ Parallel/Current Sharing
■ Ultrafast Transient Response
■ Current Mode Control
■ Programmable Soft-Start
■ Output Overvoltage Protection
■ –55°C to 125°C Operating Temperature Range (LTM4612MPV)
■ Small Surface Mount Footprint, Low Profile (15mm × 15mm × 2.8mm) LGA Package

APPLICATIONS
■ Telecom and Networking Equipment
■ Industrial and Avionic Equipment
■ RF Systems