IFX 80471SK V Infineon Technologies, IFX 80471SK V Datasheet - Page 27

• Manufacturer Part Number: IFX 80471SK V
• Manufacturer: Infineon Technologies

Specifications of IFX 80471SK V

• Packages: PG-DSO-14
• Comment: Vin up to 60V; VQ adjustable from 1.25V up to 15V; external MOS; PG-DSO-14
• Vq (max): adjustable
• Iq (max): 2,300.0 mA
• Iq (typ): 130.0 µA
• Output: Buck Converter

7.9
Device
C
C
L1
M1
C
D1
C
C
7.10
The most sensitive points for Buck converters - when considering the layout - are the nodes at the input, output
and the gate of the PMOS transistor and the feedback path.
For proper operation and to avoid stray inductance paths the external catch diode, the Buck inductance and the
input capacitor C
controller to the MOSFET has to be as short as possible. Best suitable for the connection of the cathode of the
catch diode and one terminal of the inductance would be a small plain located next to the drain of the PMOS.
The GND connection of the catch diode must be also as short as possible. In general the GND level should be
implemented as surface area over the whole PCB as second layer, if necessary as third layer. The feedback path
has to be well grounded also, a ceramic capacitance might help in addition to the output cap to avoid spikes.
To obtain the optimum filter capability of the input pi-filter it has to be located also as close as possible to the input.
To filter the supply input of the device (VS) the ceramic cap should be connected directly to the pin.
As a guideline an EMC optimized application board / layout is available.
Data Sheet
IN1
IN2
BDS
OUT
COMP
Components recommendation - Overview
Layout recommendation
IN1
have to be connected as close as possible to the PMOS device. Also the GDRV path from the
100μF, 60V
220nF, 60V
47μH, 1.6A, 145mΩ
47μH, 3.5A, 47mΩ
47μH, 3.8A, 110mΩ
68μH, 3.5A, 130mΩ
47μH, 4.0A, 97mΩ
60V, 3.44A, 130mΩ, NL
60V, 2.9A, 130mΩ, NL
60V, 9A, 250mΩ, LL
220nF, 16V
Schottky, 60V, 3A
Schottky, 40V, 3A
Schottky, 40V, 3A
Low ESR Tantalum, 100μF, 10V
see 7.8.9.
Values / Remarks
26
Application Information
Rev. 1.0, 2011-02-07
IFX80471