TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R28
Design-in
Page 72 of 164
and the components listed in
show an example of a low cost power supply circuit,
where the VCC module supply is provided by a step-down switching regulator capable of delivering to
VCC pins the specified maximum peak / pulse current, transforming a 12 V supply input.
TOBY-L2 series
12V
R5
C6
C1
VCC
INH
FSW
SYNC
OUT
GND
2
6
3
1
7
8
C3
C2
D1
R1
R2
L1
U1
GND
FB
COMP
5
4
R3
C4
R4
C5
71
VCC
72
VCC
70
VCC
12V
R5
C6
C1
VCC
INH
FSW
SYNC
OUT
GND
2
6
3
1
7
8
C3
C2
D1
R6
R7
L1
U1
GND
FB
COMP
5
4
R3
C4
R4
C5
MPCI-L2 series
24
3.3Vaux
39
3.3Vaux
2
3.3Vaux
41
3.3Vaux
52
3.3Vaux
Figure 34: Example of low cost VCC and 3.3Vaux supply application circuit using step-down regulator
Reference
Description
Part Number – Manufacturer
C1
22
µ
F Capacitor Ceramic X5R 1210 10% 25 V
GRM32ER61E226KE15 – Murata
C2
100
µ
F Capacitor Tantalum B_SIZE 20% 6.3V 15m
T520B107M006ATE015 – Kemet
C3
5.6 nF Capacitor Ceramic X7R 0402 10% 50 V
GRM155R71H562KA88 – Murata
C4
6.8 nF Capacitor Ceramic X7R 0402 10% 50 V
GRM155R71H682KA88 – Murata
C5
56 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1H560JA01 – Murata
C6
220 nF Capacitor Ceramic X7R 0603 10% 25 V
GRM188R71E224KA88 – Murata
D1
Schottky Diode 25V 2 A
STPS2L25 – STMicroelectronics
L1
5.2
µ
H Inductor 30% 5.28A 22 m
MSS1038-522NL – Coilcraft
R1
4.7 k
Resistor 0402 1% 0.063 W
RC0402FR-074K7L – Yageo
R2
910
Resistor 0402 1% 0.063 W
RC0402FR-07910RL – Yageo
R3
82
Resistor 0402 5% 0.063 W
RC0402JR-0782RL – Yageo
R4
8.2 k
Resistor 0402 5% 0.063 W
RC0402JR-078K2L – Yageo
R5
39 k
Resistor 0402 5% 0.063 W
RC0402JR-0739KL – Yageo
R6
1.5 k
Resistor 0402 1% 0.063 W
RC0402FR-071K5L – Yageo
R7
330
Resistor 0402 1% 0.063 W
RC0402FR-07330RL – Yageo
U1
Step-Down Regulator 8-VFQFPN 3 A 1 MHz
L5987TR – ST Microelectronics
Table 16: Components for low cost VCC and 3.3Vaux supply application circuit using a step-down regulator