There are 12 models in the FS160x series, divided into three output current ratings:
- FS1606 for 6A at 0.6, 1, 1.05, 1.1, 1.2, 1.5, 1.8 or 2.5V
- FS1604 for 4A at 2.5 or 3.3V
- FS1603 for 3A at 3.3 or 5V
The 600mV version of the 6A FS1606 can be converted to a variable output voltage dc-dc converter by adding two resistors.
“The dc-dc converters feature and offer an input voltage range of 4.2V to 16V,” according to distributor Mouser, which is stocking the parts, and added: “The package is suitable for automated assembly using standard surface-mount equipment.”
An internal linear regulator supplies the internal circuitry from the main power input, but if an external 5V rail is available (4.5 to 5.5V), this can be used to supply the internal circuitry via a separate pin, allowing the main power input to go as low as 2.5V instead of just 4.2V – providing the buck nature of the topology is respected.
While the inductor and mosfets are included, the bulk input and output capacitors are not, and need to be added.
Protections include over-voltage, soft-start, thermal shut-down (auto-recovery) and over-current (thermally compensated, with hiccup mode)
Operation is over -40 to +125°C (with derating at the high-end) and operation is not always down to 4.2Vin – see the data sheet for compromises.
Find TDK FS160x dc-dc convertrs on this Mouser web page
In May, Torex announced a nano-power dc-dc converter occupying 7.7 x 3.1mm including external capacitors
