User's Manual

TOBY-R2 series - System Integration Manual
UBX-16010572 - R04 Design-in
Page 71 of 147
Figure 31 and the components listed in Table 22 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 proper 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 31
and Table 22). 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
C2R1
R2
U1
EN
TOBY-R2 series
71
VCC
72
VCC
70
VCC
GND
C3
Figure 31: Example of low cost VCC supply application circuit using an LDO linear regulator
Reference
Description
Part Number - Manufacturer
C1, C2
10 µF Capacitor Ceramic X5R 0603 20% 6.3 V
GRM188R60J106ME47 - Murata
C3
330 µF Capacitor Tantalum D_SIZE 6.3 V 45 m
T520D337M006ATE045 - KEMET
R1
27 k Resistor 0402 5% 0.1 W
RC0402JR-0727KL - Yageo Phycomp
R2
4.7 k Resistor 0402 5% 0.1 W
RC0402JR-074K7L - Yageo Phycomp
U1
LDO Linear Regulator ADJ 3.0 A
LP38501ATJ-ADJ/NOPB - Texas Instrument
Table 22: Components for low cost VCC supply application circuit using an LDO linear regulator