ADS1299: Power consumption

Part Number: ADS1299

Tool/software:

Hello TI team, 

I have designed a medical device that use ADS1299 in the continuous reading mode. According to the datasheet, the power consumption should be 8.14mA including I_AVDD and I_DVDD @ 3.3V. 

In my design, the main power comes from a 3.7V battery (V_SWITCH), and I've used four regulators to get 3.3V, +2.5V, -3.7V, and -2.5V. However, the actual power consumption is quite different from what's mentioned in the datasheet. The current from the V_SWITCH line is about 15mA, and I've measured the output current of each regulator as follows:

  • Reg3.3V = 1.1mA

  • Reg+2.5V = 7.29mA

  • Reg-2.5V = 7.25mA

Could you please take a look at my schematic and help me figure out why there's such a big difference in power consumption?

Thanks a lot for your help!

Saeed