DC290A-B: 1.5, 2.5, 3.3V @ 600mA, 2.65 ~ 6V in, Buck

Demonstration circuit DC290 is a constant-frequency step-down converter using an LTC®1877 or an LTC1878 monolithic synchronous regulator. The LTC1878 has an input voltage range of 2.65V < VIN < 6V and the LTC1877 has an input voltage range of 2.65V < VIN < 10V. The LTC1878 is optimized for low voltage operation and is ideally suited for single Li-Ion cell or 3-NiCd/NiMH cell applications. The TC1877, with its higher voltage capability, is ideally suited for two Li-Ion cells or 4- to 6-NiCd/NiMH cell applications.

The exclusive use of low profile surface mount components on this demo board results in a highly efficient application in a small volume. The output voltage can be selected from 1.5V, 2.5V, 3.3V or a user programmable voltage, by means of a jumper.

The frequency is internally set at 550 kHz or can be synchronized with an external clock. The internal switches allow up to 600mA of output current in an MSO8 package, providing a space-efficient solution for battery-powered applications. The DC supply current is typically only 10 mA at no load and less than 1 mA in shutdown. In switching-noise sensitive applications, Burst Mode™ operation can be inhibited by grounding the SYNC/MODE pin with a jumper or synchronizing it with an external clock.