EVALA5972D STMicroelectronics, EVALA5972D Datasheet - Page 18

• Manufacturer Part Number: EVALA5972D
• Description: Power Management Modules & Development Tools EVAL BOARD A5972 Auto Grade
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of EVALA5972D

• Input Voltage: 4.4 V to 36 V
• Output Voltage: 1.235 V to 35 V
• Board Size: 23 mm x 20 mm
• Product: Power Management Modules
• Supply Current: 2 A
• Dimensions: 23 mm x 20 mm
• For Use With/related Products: AN1517
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application information
5.2
18/29
Table 4.
Layout considerations
The layout of switching DC-DC converters is very important to minimize noise and
interference. Power-generating portions of the layout are the main cause of noise and so
high switching current loop areas should be kept as small as possible and lead lengths as
short as possible.
High impedance paths (in particular the feedback connections) are susceptible to
interference, so they should be as far as possible from the high current paths. A layout
example is provided in
The input and output loops are minimized to avoid radiation and high frequency resonance
problems. The feedback pin connections to the external divider are very close to the device
to avoid pick-up noise. Moreover, the GND pin of the device is connected to the ground
plane directly with VIA on the bottom side of the PCB.
Figure 13. Layout example
Wurth Elektronik
MINIMUN SIZE OF FEEDBACK
PIN CONNECTIONS TO AVOID
PICKUP
Manufacturer
CONNECTION TO
GROUNDPLANE
THROUGH VIAS
Coiltronics
Coilcraft
Epcos
BI
Inductor selection
VERY SMALL HIGH CURRENT
CIRCULATING PATH TO MINIMIZE
RADIATION AND HIGH FREQUENCY
RESONANCE PROBLEMS
Vin
R2
R1
Figure 13
to output voltage
Cin
DO3316
HM76-3
B82476
744561
Series
UP2B
5
8
below.
L5972D
4
1
D
COMPENSATION NETWORK FAR
FROM HIGH CURRENT PATHS
Inductor value (µH)
33 to 47
33 to 47
33 to 47
33 to 47
33 to 47
Cout
L
AM00131v1
Vout
Gnd
Saturation current (A)
OUTPUT CAPACITOR
DIRECTLY CONNECTED
TO HEAVY GROUND
1.6 to 2
1.7 to 2
2 to 2.5
1.6 to 2
1.6 to 2
AN1517