Datasheet

10
LT1614
Capacitors
As described previously, ceramic capacitors can be used
with the LT1614. For lower cost applications, small tanta-
lum units can be used. A value of 22µF is acceptable,
although larger capacitance values can be used. ESR is the
most important parameter in selecting an output capaci-
tor. The “flying” capacitor (C2 in the schematic figures)
should be a 1µF ceramic type. An X5R or X7R dielectric
should be used to avoid capacitance decreasing severely
with applied voltage. The input bypass capacitor is less
critical, and either tantalum or ceramic can be used with
little trade-off in circuit performance. Some capacitor
types appropriate for use with the LT1614 are listed in
Table 2.
Diodes
A Schottky diode is recommended for use with the LT1614.
The Motorola MBR0520 is a very good choice. Where the
input to output voltage differential exceeds 20V, use the
MBR0530 ( a 30V diode).
OPERATIO
U
Table 1. Inductor Vendors
VENDOR PHONE URL PART COMMENT
Sumida [phone] www.sumida.com CLS62-22022 22µH Coupled
CD43-470 47µH
Murata [phone] www.murata.com LQH3C-220 22µH, 2mm Height
Coiltronics [phone] www.coiltronics.com CTX20-1 20µH Coupled, Low DCR
Table 2. Capacitor Vendors
VENDOR PHONE URL PART COMMENT
Taiyo Yuden [phone] www.t-yuden.com Ceramic Caps X5R Dielectric
AVX [phone] www.avxcorp.com Ceramic Caps
Tantalum Caps
Murata [phone] www.murata.com Ceramic Caps