In the circuit design of 10G combo PON OLT optical modules, the power supply voltage to the CDR is 1.8V, which requires the use of a BUCK-DCDC to reduce the voltage from 3.3V to 1.8V, and the output current needs to be greater than 1A.  SGMICRO recently launched a buck DCDC SGM61020 with an output current up to 1.2A and a size of only 2x2mm.  It has the advantages of high output current, small size, and high efficiency, making it ideal for applications in 10G combo PON OLT optical modules.

The typical application circuit is shown in the figure below:

Figure1.Typical Application Circuit

SGM61012 focuses on high-efficiency buck conversion in a large output current range.  Under medium to heavy load conditions, the converter operates in PWM mode, and automatically enters power-saving mode operation under light load currents to maintain high efficiency throughout the entire load current range. The static operating current is only 25μA. Its specific parameters are as follows:

The internal principle block diagram of SGM61012:

Package of SGM61012:

To sum up:

SGM61012 has the advantages of high output current, small size, wide voltage input range, and high conversion efficiency.  It can be widely used in the voltage conversion circuit part of optical modules and can assist in optical module design.