CAT32 CATALYST [Catalyst Semiconductor], CAT32 Datasheet - Page 7

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

Inductor Selection and Efficiency
Inductor vendors are shown below. Contact the manufacturer for detailed technical data and new product information.
Table 1: Inductor Manufacturers
Low ESR (equivalent series resistance) capacitors should
be used at the output to minimize the output ripple
voltage. The low ESR and small package options
available with multilayer ceramic capacitors make them
excellent choices. The X5R and X7R capacitor types are
preferred because they retain their capacitance over
wider voltage and temperature ranges than the Y5V or
Z5U types. A 1.0 F or 2.2 F output capacitor is
recommended for most applications.
The voltage rating of the output capacitor C2 depends on
the number of LEDs driven in series. A 10V ceramic
capacitor is recommended when driving two LEDs. A
16V ceramic capacitor is recommended when driving 3
or 4 LEDs.
Table 2: Ceramic Capacitor Manufacturers
ELJEA4R7
ELJEA6R8
LQH3C4R7M24,
LQH32CN4R7M11
LQH3C100K24,
LQH32CN100K11
LB2016B4R7
LB2016B100
CMD4D06-4R7
CMD4D06-6R8
CLQ4D10-4R7
CLQ4D10-6R8
Supplier
Taiyo Yuden
Murata
Kemet
Inductor
L ( H)
4.7
6.8
4.7
4.7
3.8
4.7
6.8
4.7
6.8
10
Phone
408.573.4150
814.237.1431
408.986.0424
DCR (m )
Maximum
180
250
260
300
250
350
216
296
162
195
Height (mm)
Maximum
Web
www.t-yuden.com
www.murata.com
www.kemet.com
2.2
2.2
2.2
2.2
2.0
2.0
0.8
0.8
1.2
1.2
7
Low profile ceramic capacitors with a 1mm maximum
height/thickness are available for designs height
requirements. Ceramic capacitors also make a good
choice for the input capacitor, which should be mounted
as close as possible to the CAT32. A 2.2 F or 4.7 F
input capacitor is recommended. Table 2 shows a list of
several ceramic capacitor manufacturers. Consult the
manufacturers for detailed information as new products
and package options are introduced regularly.
Vendor
Panasonic
714.373.7334
Murata
770.436.1300
Taiyo Yuden
408.573.4150
Sumida
847.956.0666
Web
www.panasonic.com
www.murata.com
www.t-yuden.com
www.sumida.com
Doc No. 5001, Rev. AC