LISA-U1 series - System Integration Manual
3G.G2-HW-10002-3
Preliminary
System description
Page 22 of 125
Reference
Description
Part Number - Manufacturer
C1
47 µF Capacitor Aluminum 0810 50 V
MAL215371479E3 - Vishay
C2
10 µF Capacitor Ceramic X7R 5750 15% 50 V
C5750X7R1H106MB - TDK
C3
10 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C103KA01 - Murata
C4
680 pF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71H681KA01 - Murata
C5
22 pF Capacitor Ceramic COG 0402 5% 25 V
GRM1555C1H220JZ01 - Murata
C6
10 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C103KA01 - Murata
C7
470 nF Capacitor Ceramic X7R 0603 10% 25 V
GRM188R71E474KA12 - Murata
C8
22 µF Capacitor Ceramic X5R 1210 10% 25 V
GRM32ER61E226KE15 - Murata
C37
330 µF Capacitor Tantalum D_SIZE 6.3 V 45 m
Ω
T520D337M006ATE045 - KEMET
D1
Schottky Diode 40 V 3 A
MBRA340T3G - ON Semiconductor
L1
10 µH Inductor 744066100 30% 3.6 A
744066100 - Wurth Electronics
L2
1 µH Inductor 7445601 20% 8.6 A
7445601 - Wurth Electronics
R1
470 k
Ω
Resistor 0402 5% 0.1 W
2322-705-87474-L - Yageo
R2
15 k
Ω
Resistor 0402 5% 0.1 W
2322-705-87153-L - Yageo
R3
22 k
Ω
Resistor 0402 5% 0.1 W
2322-705-87223-L - Yageo
R4
390 k
Ω
Resistor 0402 1% 0.063 W
RC0402FR-07390KL - Yageo
R5
100 k
Ω
Resistor 0402 5% 0.1 W
2322-705-70104-L - Yageo
U1
Step Down Regulator MSOP10 3.5 A 2.4 MHz
LT3972IMSE#PBF - Linear Technology
Table 5: Suggested components for the VCC voltage supply application circuit using a step-down regulator
Low Drop-Out (LDO) linear regulator
The characteristics of the LDO linear regulator connected to the
VCC
pins should meet the following
requirements:
Power capabilities
: the LDO linear regulator with its output circuit must be capable of providing a proper
voltage value to the
VCC
pins and of delivering 2.5 A current pulses with 1/8 duty cycle
Power dissipation
: the power handling capability of the LDO linear regulator must be checked to limit its
junction temperature to the maximum rated operating range (i.e. check the voltage drop from the max input
voltage to the min output voltage to evaluate the power dissipation of the regulator)
Output voltage slope
: the use of the soft start function provided by some voltage regulators must be
carefully evaluated, since the voltage at the
VCC
pins must ramp from 2.5 V to 3.2 V within 1 ms to allow a
proper switch-on of the module
Figure 8 and the components listed in Table 6 show an example of a power supply circuit, where the
VCC
module supply is provided by an LDO linear regulator capable of delivering 2.5 A current pulses, with proper
power handling capability. The use of a linear regulator is suggested when the difference from the available
supply rail and the VCC value is low: linear regulators provide high efficiency when transforming a 5 V supply to
the 3.8 V typical value of the VCC supply.
