SARA-R4 series - System integration manual
UBX-16029218 - R20
Design-in
Page 49 of 128
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 as in the circuit
described in
). 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
SARA-R4 series
52
VCC
53
VCC
51
VCC
GND
C2
C3 C4 C5
C6
Figure 25: Example of low cost VCC supply circuit for SARA-R4 series modules, using an LDO linear regulator
Reference
Description
Part Number - Manufacturer
C1
10
µ
F Capacitor Ceramic X5R 0603 20% 6.3 V
Generic manufacturer
C2
100
µ
F 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 15: Suggested components for low cost VCC supply circuit for SARA-R4 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.
