Inverting, boost or buck-boost micromodule converter delivers up to 700-mA with four small passive components

February 06, 2013 // By Paul Buckley
Linear Technology Corporation has introduced a 2.8 V-18 V input, multi-topology DC/DC µModule (micromodule) converter, with onboard inductor, power switch and DC/DC controller delivering up to 700 mA output current.

With the addition of only two resistors and two capacitors, the LTM8045 can be configured to regulate either a positive output voltage (SEPIC topology) between 2.5 V and 15 V or a negative output voltage (inverting topology) between -2.5 V and -15 V. The LTM8045 is designed for point-of-load regulation in communications, imaging and handheld test equipment.     

In the SEPIC configuration, the LTM8045's input voltage can be above, below or equal to the regulated output voltage. If configured as a negative output inverter, no level shifting circuitry is required by the logic level control pins. Under a -5V, 500 mA load, the LTM8045 achieves 80% efficiency from a positive 12 V input supply. The operating frequency range is 200 kHz to 2 MHz, adjustable via an external resistor and can be synchronized to an external clock within the same frequency range.     

Availability and Pricing      

The LTM8045 is packaged in a 6.25mm x 11.25mm x 4.92mm BGA and operation is guaranteed across the -40°C to +125°C and -55°C to +125°C internal temperature range. Pricing starts at $6.97 each for 1,000 piece quantities. The LTM8045 is available for immediate delivery from stock.      

More information about the micromodule converter at