SARA-R4 series - System integration manual
UBX-16029218 - R20 Design-in Page 49 of 128
C1-Public
Figure 25 and the components listed in Table 15 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 Figure 25 and Table 15). 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
Part Number - Manufacturer
10 µF Capacitor Ceramic X5R 0603 20% 6.3 V
100 µF Capacitor Tantalum B_SIZE 20% 6.3V 15m
T520B107M006ATE015 – Kemet
100 nF Capacitor Ceramic X7R 16 V
GRM155R71C104KA01 - Murata
10 nF Capacitor Ceramic X7R 16 V
GRM155R71C103KA01 - Murata
68 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1E680JA01 - Murata
15 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1E150JA01 - Murata
27 k Resistor 0402 5% 0.1 W
4.7 k Resistor 0402 5% 0.1 W
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 2.2.1.10, and in particular Figure 31 / Table 20, for the parts recommended to be
provided if the application device integrates an internal antenna.
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