Integration Manual

SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R13 Design-in Page 46 of 119
Figure 21 and the components listed in Table 14 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 21 and Table 14). 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/ N4
52
VCC
53
VCC
51
VCC
GND
C2
C3 C4 C5 C6
Figure 21: Example of low cost VCC supply circuit for SARA-R4/N4 series 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 15mΩ
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 kΩ Resistor 0402 5% 0.1 W
Generic manufacturer
R2
4.7 kΩ Resistor 0402 5% 0.1 W
Generic manufacturer
U1 LDO Linear Regulator ADJ 3.0 A LP38501ATJ-ADJ/NOPB - Texas Instrument
Table 14: Suggested components for low cost VCC supply circuit for SARA-R4/N4 modules, using an LDO linear regulator
☞
☞☞
☞ See the section 2.2.1.10, and in particular Figure 27 / Table 19, for the parts recommended to be provided if the
application device integrates an internal antenna.