User's Manual

4.0 DC INPUT REQUIREMENTS
4.1 Power Consumption Ratings
The module has the following nominal power consumption ratings when operated at the required input voltage of 4.5
Vdc (-0.05/+0.05 V tolerance) at the power connections:
Active Receive Mode: 130mA, Transmit Mode (Worst Case Load): 1.3 Amperes
4.5 VDC Power Regulation must be met by OEM to satisfy LMA conditions:
OEM Integrator should consult with Product Support for individual circuit implementations. At minimum, OEM
Integrators must regulate the DC voltage applied to the NX915 module at +4.5 Vdc (V_NIC), with a tolerance of -
0.05/+0.05 Vdc. This can be achieved using a voltage regulator similar to the Texas Instruments LMR12020, which is
a precision DC regulator. The external +4.5 VDC input is connected via pins 2, 24, 39, 41, and 52 of the 52 pin
MiniPCIe card edge connector. The transmitter uses a closed-loop power detection circuit that ensures the peak RF
power will never exceed +30dBm.
The input voltage range of the LMR12020 device in this configuration is 10V to 15V. Using switched-mode power-
conversion technology, the LMR12020 can step down to voltages as low as 1.13V from a 10V input bus, with typically
less than 1 W of power dissipation. The output voltage must be set to a voltage of 4.5V, using an external trim
resistor. Operating features of the TI device include cycle-by-cycle current limiting, under-voltage lockout (UVLO),
on/off inhibit, output overcurrent protection, and over-temperature protection.
For example purposes, a circuit employing this method of regulation is shown below in schematic form.