ST662A ST Microelectronics, ST662A Datasheet - Page 6

• Manufacturer Part Number: ST662A
• Description: DC-DC CONVERTER
• Manufacturer: ST Microelectronics

ST662A
APPLICATION CIRCUIT
Based on fast charge/discharge of capacitors, this circuit involves high di/dt values limited only by R
of
ON
switches. This implies a critical layout design due to the need to minimize inductive paths and place
capacitors as close as possible to the device.
A good layout design is strongly recommended for noise reason. For best performance, use very short
connections to the capacitors and the values shown in table 1.
C3 and C4 must have low ESR in order to minimize the output ripple. Their values can be reduced to 2µF
and 1µF, respectively, when using ceramic capacitors, but must be of 10µF or larger if aluminium
electrolytic are chosen.
C5 must be placed as close to the device as possible and could be omitted if very low output noise
performance are not required.
Fig 13 and Fig 14 show, respectively, our EVALUATION kit layout and the relatively.
Figure 13 : KIT Lay-out
Figure 14 : Electrical Schematic
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