LEXI-R422 - System integration manual
UBX-23007449 - R02
Design-in
Page 38 of 108
C1-Public
and the components listed in
show an example of a low cost power supply circuit,
where the
VCC
module supply is provided by an LDO linear regulator capable of delivering the specified
highest peak / pulse current, with an appropriate power handling capability. The regulator described
in this example supports a limited input voltage range and it includes internal circuitry for current and
thermal protection.
It is recommended to configure the LDO linear regulator to generate a voltage supply value slightly
below the maximum limit of the module VCC normal operating range (e.g. ~4.1 V). This reduces the
power on the linear regulator and improves the whole thermal design of the supply circuit.
5V
C1
IN
OUT
ADJ
GND
1
2
4
5
3
R1
R2
U1
EN
LEXI-R422
A13
VCC
A14
VCC
A12
VCC
GND
C2
C3 C4 C5
C6
Figure 20: Example of low cost VCC supply circuit for LEXI-R422 modules, using an LDO linear regulator
Reference
Description
Part number - Manufacturer
C1
10 µF capacitor ceramic X5R 0603 20% 6.3 V
Generic manufacturer
C2
100 µF capacitor tantalum B_SIZE 20% 6.3V 15m
T520B107M006ATE015
–
Kemet
C3
100 nF capacitor ceramic X7R 16 V
GRM155R71C104KA01 - Murata
C4
10 nF capacitor ceramic X7R 16 V
GRM155R71C103KA01 - Murata
C5
68 pF capacitor ceramic C0G 0402 5% 50 V
GRM1555C1E680JA01 - Murata
C6
15 pF capacitor ceramic C0G 0402 5% 50 V
GRM1555C1E150JA01 - Murata
R1
27 k
resistor 0402 5% 0.1 W
Generic manufacturer
R2
4.7 k
resistor 0402 5% 0.1 W
Generic manufacturer
U1
LDO linear regulator ADJ 3.0 A
LP38501ATJ-ADJ/NOPB - Texas Instrument
Table 13: Suggested components for low cost VCC supply circuit for LEXI-R422 modules, using an LDO linear regulator
☞
See the section
, and in particular
, for the parts recommended to be
provided if the application device integrates an internal antenna.
