Integration Manual

SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11 Design-in Page 62 of 157
U1
LDO Linear Regulator 1.0 A
AP7361 – Diodes Incorporated
Table 13: Components for high reliability VCC supply circuit for SARA-R404M /-R410M /-N410, 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.
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 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 14: Suggested components for low cost VCC supply circuit for SARA-R4/N4 modules, using an LDO linear regulator