CAT32 CATALYST [Catalyst Semiconductor], CAT32 Datasheet - Page 10

• Manufacturer Part Number: CAT32
• Description: CMOS White LED Driver
• Manufacturer: CATALYST [Catalyst Semiconductor]

VIN
VIN
The CAT32 is a high-frequency switching regulator and
therefore proper PCB board layout and component
placement can minimize noise and radiation and increase
efficiency. To maximize efficiency, the CAT32 design
has fast switch rise and fall times. To prevent radiation
and high frequency resonance problems minimize the
length and area of all traces connected to the SW pin and
The application diagrams below are shown for the SOT23 packages.
Doc. No. 5001, Rev. AC
CONTROL
CONTROL
DIMMING
DIMMING
2.5V DC
2.5V DC
5
5
SHDN
RSET
SHDN
RSET
6
VIN
6
VIN
4
4
CAT32
CAT32
GND
GND
SW
SW
LED
LED
1
1
2
2
3
3
D1
D1
15mA
15mA
10
use a ground plane under the switching regulator.
The switch, schottky output diode and output capacitor
signal path should be kept as short as possible. The
ground connection for the R
directly to the GND pin and not be shared with other
components.
LED CURRENT [mA]
SET
resistor should be tied