LEXI-R422 - System integration manual
UBX-23007449 - R02
Design-in
Page 35 of 108
C1-Public
show an example of a high reliability power supply
circuit for the LEXI-R422 modules, where the module VCC input is supplied by a step-down switching
regulator capable of delivering the highest peak / pulse current specified for the 2G use-case, with low
output ripple and with fixed switching frequency in PWM mode operation greater than 1 MHz.
LEXI-R422
12V
C5
R3
C4
R2
C2
C1
R1
VIN
RUN
VC
RT
PG
SYNC
BD
BOOST
SW
FB
GND
6
7
10
9
5
C6
1
2
3
8
11
4
C7
C8
D1
R4
R5
L1
C3
U1
A13
VCC
A14
VCC
A12
VCC
GND
C9 C10 C11
Figure 17: Example of high reliability VCC supply circuit for LEXI-R422 modules, using a step-down regulator
Reference
Description
Part number - Manufacturer
C1
10 µF capacitor ceramic X7R 5750 15% 50 V
Generic manufacturer
C2
10 nF capacitor ceramic X7R 0402 10% 16 V
Generic manufacturer
C3
680 pF capacitor ceramic X7R 0402 10% 16 V
Generic manufacturer
C4
22 pF capacitor ceramic C0G 0402 5% 25 V
Generic manufacturer
C5
10 nF capacitor ceramic X7R 0402 10% 16 V
Generic manufacturer
C6
470 nF capacitor ceramic X7R 0603 10% 25 V
Generic manufacturer
C7
100 µF capacitor tantalum B_SIZE 20% 6.3V 15m
T520B107M006ATE015
–
Kemet
C8
100 nF capacitor ceramic X7R 16 V
GRM155R71C104KA01 - Murata
C9
10 nF capacitor ceramic X7R 16 V
GRM155R71C103KA01 - Murata
C10
68 pF capacitor ceramic C0G 0402 5% 50 V
GRM1555C1E680JA01 - Murata
C11
15 pF capacitor ceramic C0G 0402 5% 50 V
GRM1555C1E150JA01 - Murata
D1
Schottky diode 40 V 3 A
MBRA340T3G - ON Semiconductor
L1
10 µH inductor 744066100 30% 3.6 A
744066100 - Wurth Electronics
R1
470 k
resistor 0402 5% 0.1 W
Generic manufacturer
R2
15 k
resistor 0402 5% 0.1 W
Generic manufacturer
R3
22 k
resistor 0402 5% 0.1 W
Generic manufacturer
R4
390 k
resistor 0402 1% 0.063 W
Generic manufacturer
R5
100 k
resistor 0402 5% 0.1 W
Generic manufacturer
U1
Step-down regulator MSOP10 3.5 A 2.4 MHz
LT3972IMSE#PBF - Linear Technology
Table 10: Components for high reliability VCC supply circuit for LEXI-R422 modules, using a step-down regulator
☞
See the section
, and in particular
, for the parts recommended to be
provided if the application device integrates an internal antenna.