97% Efficient, Buck-Boost DC/DC Regulator Operates with up to 36VIN & 24VOUT without Hot Spots

The LTM4607 integrates a synchronous buck-boost DC/DC controller, four N-channel MOSFETs, input and output bypass capacitors and all compensation circuitry in a 15mm x 15mm x 2.8mm land grid array (LGA) plastic molded package. Only an inductor, feedback and sense resistors, and bulk capacitors are required to implement a very low profile, compact and high efficiency design. The LTM4607 provides a compact regulator solution for applications such as networking, industrial, automotive systems and high power battery-operated devices.

The LTM4607's on-board proprietary 4-switch synchronous MOSFET design achieves up to 92% efficiency in boost mode (VIN: 5V, VOUT: 16V, IOUT: 2.5A) and up to 97.7% efficiency in buck mode (VIN: 32V, VOUT: 20V, IOUT: 8A). Unlike other topologies such as SEPIC (Single Ended Primary Inductor Converter), which require up to 20 components and custom magnetics, the LTM4607 buck-boost uModule solution uses only 8 components and an off-the-shelf inductor. In addition, the efficiency of a comparable SEPIC circuit is only 76% to 84%. Furthermore, to reduce undesirable frequency harmonics, the LTM4607 is phase-lockable to an external clock frequency ranging from 200kHz to 400kHz. Safety features include overvoltage and foldback current protection.