u-blox LARA-R2 series System Integration Manual page 67

Figure 26 and the components listed in Table 19 show an example of a high reliability power supply circuit,
where the module VCC is supplied by a step-down switching regulator capable of delivering to VCC pins the
specified maximum peak / pulse current, with low output ripple and with fixed switching frequency in PWM
mode operation greater than 1 MHz.
12V
R1
R2 R3
C1 C2 C3 C4
Figure 26: Example of high reliability VCC supply application circuit using a step-down regulator
Reference Description
C1 10 µF Capacitor Ceramic X7R 5750 15% 50 V
C2 10 nF Capacitor Ceramic X7R 0402 10% 16 V
C3 680 pF Capacitor Ceramic X7R 0402 10% 16 V
C4 22 pF Capacitor Ceramic C0G 0402 5% 25 V
C5 10 nF Capacitor Ceramic X7R 0402 10% 16 V
C6 470 nF Capacitor Ceramic X7R 0603 10% 25 V
C7 22 µF Capacitor Ceramic X5R 1210 10% 25 V
C8
330 µF Capacitor Tantalum D_SIZE 6.3 V 45 m
D1 Schottky Diode 40 V 3 A
L1 10 µH Inductor 744066100 30% 3.6 A
R1
470 k Resistor 0402 5% 0.1 W
R2
15 k Resistor 0402 5% 0.1 W
R3
22 k Resistor 0402 5% 0.1 W
R4
390 k Resistor 0402 1% 0.063 W
R5
100 k Resistor 0402 5% 0.1 W
U1 Step-Down Regulator MSOP10 3.5 A 2.4 MHz
Table 19: Components for high reliability VCC supply application circuit circuit using a step-down regulator
UBX-16010573 - R02
4
VIN
5 1
RUN BD
9 2
BOOST
VC
3
10
RT SW
U1
7
PG
6
8
FB
SYNC
GND
C5
11
LARA-R2 series - System Integration Manual
C6
L1
C7
D1
R4
R5
Part Number - Manufacturer
C5750X7R1H106MB - TDK
GRM155R71C103KA01 - Murata
GRM155R71H681KA01 - Murata
GRM1555C1H220JZ01 - Murata
GRM155R71C103KA01 - Murata
GRM188R71E474KA12 - Murata
GRM32ER61E226KE15 - Murata
T520D337M006ATE045 - KEMET
MBRA340T3G - ON Semiconductor
744066100 - Wurth Electronics
2322-705-87474-L - Yageo
2322-705-87153-L - Yageo
2322-705-87223-L - Yageo
RC0402FR-07390KL - Yageo
2322-705-70104-L - Yageo
LT3972IMSE#PBF - Linear Technology
Objective Specification
LARA-R2 series
VCC
51
VCC
52
VCC
53
C8
GND
Design-in
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