Cost-effective backlight driver design and power solutions

In general, the removal of inductive boost backlight driver, the common backlight drivers are the following: ① 1 times the LDO mode; ② 1/1.5 times the charge pump model; ③ 1/1.33/1.5 times the charge pump model; ④ 1 / 2 Times the charge pump mode. 1x LDO mode driver although the lowest cost, but the call in the low battery voltage, there will be splash screen phenomena, engineers had to improve the off voltage, thus shortening battery life, many people can not accept, because the battery life have been in the smart Machine design is a key indicator. For the remaining terms of three ways, which means the highest price?

We each selected a representative to do a comparison test related devices, the following test data show 1/1.5 times the charge pump is a cost-effective way to drive the program. Consumption from the current perspective, the data show in Figure 1: Mode 2 times 2 times at startup drive mode, current mode drive than the 1.5 times higher 60mA, and 1.5 times and 1.33 times the current consumption pattern almost the same drive.