One of the cost competitive solutions is the pure boost (TPS61094 or TPS610995) solution (reference 4), similar to Figure 2-4. In this solution, customers could use HLC1520(vender: Tadiran), SPC1520(vendor: EVE) or UPC1520(vender: HCB) and they need to add a pure boost (TPS61094 or TPS610995) to regulate output voltage to about 3.6 V over the whole temperature range. This solution is not sensitive to HLC vendor and size, so the total cost is more competitive than the connecting battery directly.

Figure 2-4 The Pure Boost TPS61094 or TPS610995 Solution

The weakness of the pure boost solution is that the discharge current of LiSOCl₂ battery is uncontrolled. We cannot get the maximum LiSOCl₂ battery capacity, and the end-off voltage of the battery package is not controllable. If the terminal voltage is too low(< 2 V), it has unrecoverable effects on the battery lifetime.