User's Manual

microNode Integration Specification DC and AC Characteristics
On-Ramp Wireless, Inc. 7 014-0033-00 Rev. H
1. LDO Regulators that work from 2.2V up to 5.5V.
These are enabled when the POWER_ON signal for the microNode is active. These can act as
a linear load as voltage increases from minimum to maximum – although these circuits do
not normally consume much power.
2. Switching power domains.
When the microNode wakes up to communicate with the Host or for networking events, its
switching regulators are enabled. These buck-boost switching regulators supply the 3.3V
and other logic supplies over the input range of 2.2-5.5V. The power efficiency of these
regulators change dramatically over input voltage, load levels, and temperature. Nominally,
the power efficiency is best at 3-4.0V. The efficiency becomes poor below 3.0V and is
moderately efficient at the higher input levels.
The following graphs show the relative differences across the operating voltages and their effect
on current consumption.
Figure 4. microNode Deep Sleep Power Consumption (mW Power vs VBATT Input)
0
0.05
0.1
0.15
0.2
0.25
2 2.5 3 3.5 4 4.5 5 5.5
-40C Sleep
-30C Sleep
-20C Sleep
-10C Sleep
0C Sleep
10C Sleep
20C Sleep
30C Sleep
40C Sleep
50C Sleep
60C Sleep
70C Sleep