5.4A, 36V micro-module buck-boost regulator

September 10, 2015 // By Graham Prophet
LTM8054 is a 36VIN (40Vmax) 5.4A µModule (micromodule) regulator in a 11.25 x 15 x 3.42 mm BGA package. The LTM8054 regulates an output voltage equal to, greater or less than the input voltage. This enables a regulated output voltage even if either or both input and output voltages vary greatly as the device seamlessly transitions between buck and boost functions.

The device includes the inductor, DC/DC regulator, MOSFETs and the supporting components. The LTM8054 regulates an output voltage between 1.2V and 36V, from 5V to 36V input supply, in three operating modes of buck (step-down), boost (step-up) and buck-boost (VIN approximates VOUT).

LTM8054 uses a 4-switch buck-boost topology to maximise efficiency: 92% for 24VIN, 12VOUT (buck) and 94% for 36VIN, 24VOUT. Transition between the modes of operation is automatic, making the LTM8054 a simple and compact DC/DC regulator solution for a wide range of applications such as industrial controls, automotive, solar and high power battery-supplied systems.

The LTM8054 has input and output current limit and monitoring functions, for applications that require constant current operation, such as LED drives, battery chargers, fan control and thermoelectric cooling controllers. The device enables load sharing operation from various input sources. The switching frequency is adjustable by an external single resistor from 100 kHz to 800 kHz and it can be synchronised to an external clock from 200 kHz to 700 kHz. The LTM8054 operates from -40°C to 125°C and -55°C to 125°C and can be paralleled for increased current. It is priced at $15.95 (1000).

Linear Technology; www.linear.com/product/LTM8054