STEVAL-ISA053V2 STMicroelectronics, STEVAL-ISA053V2 Datasheet - Page 39

• Manufacturer Part Number: STEVAL-ISA053V2
• Description: BOARD EVALUATION FOR PM6680A
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA053V2

• Design Resources: STEVAL-ISA053V2 Gerber Files PM6680A Eval Kit Schematic STEVAL-ISA053V2 Bill of Material
• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 3, Non-Isolated
• Voltage - Output: 1.8V, 3.3V, 5V
• Current - Output: 2.5A, 2.5A, 100mA
• Voltage - Input: 6 ~ 28V
• Regulator Topology: Buck
• Frequency - Switching: 200kHz, 300kHz
• Board Type: Fully Populated
• Utilized Ic / Part: PM6680A
• Input Voltage: 6 V to 36 V
• Output Voltage: 5 V
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: PM6680A
• Other names: 497-6379

PM6680A
9.7
Other parts design
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Figure 38. VIN pin filter
Typical components values are: R = 3.9 Ω and C = 4.7 µF.
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Figure 39. Inductor current waveforms
Typical components values are: R = 47 Ω and C = 1µF.
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VIN filter
A VIN pin low pass filter is suggested to reduce switching noise. The low pass filter is
shown in the next figure:
VCC filter
A VCC low pass filter helps to reject switching commutations noise:
VREF capacitor
A 10nF to 100nF ceramic capacitor on VREF pin must be added to ensure noise
rejection.
LDO5 output capacitors
Bypass the output of each linear regulator with 1 µF ceramic capacitor closer to the
LDO pin and a 4.7µF tantalum capacitor (ESR = 2 Ω). In most applicative conditions a
4.7 µF ceramic output capacitor can be enough to ensure stability.
Bootstrap circuit
The external bootstrap circuit is represented in the next figure:
Input
voltage
R
R
C
C
R
R
C
C
1
1
0
0
0
0
p
p
F
F
L
V
L
V
V
V
D
D
C
C
I
I
N
N
O
O
C
C
5
5
Design guidelines
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