Converter delivers up to 700mA with only four small passive components

Linear Technology Corp. has introduced the LTM8045, a 2.8V-18V input, multi-topology DC/DC µModule (micromodule) converter, with onboard inductor, power switch and DC/DC controller delivering up to 700mA 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 2.5V and 15V or a negative output voltage (inverting topology) between -2.5V and -15V. 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, 500mA load, the LTM8045 achieves 80% efficiency from a positive 12V input supply. The operating frequency range is 200kHz to 2MHz, adjustable via an external resistor and can be synchronized to an external clock within the same frequency range.