LM3355 datasheet(7/9 Pages) NSC

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Filter Capacitor Selection (Continued)

iii) C

FIL

A 1 µF, X7R ceramic capacitor should be connected to pin

FIL. This capacitor provides the filtering needed for the

internal supply rail of the LM3355.

Of the different capacitor technologies, a sample of vendors

that have been verified as suitable for use with the LM3355

are shown in

Table 2.

TABLE 2. Capacitor Vendor Information

Manufacturer

Tel

Fax

Website

Ceramic

Taiyo-yuden

(408) 573-4150

(408) 573-4159

www.t-yuden.com

AVX

(803) 448-9411

(803) 448-1943

www.avxcorp.com

Sprague/Vishay

(207) 324-4140

(207) 324-7223

www.vishay.com

Tantalum

Nichicon

(847) 843-7500

(847) 843-2798

www.nichicon.com

Polymer Electrolytic

Cornell-Dubilier (ESRD)

(508) 996-8561

(508) 996-3830

www.cornell-dubilier.com

Sanyo (POSCAP)

(619) 661-6322

(619) 661-1055

www.sanyovideo.com

Thermal Protection

During output short circuit conditions, the LM3355 will draw

high currents causing a rise in the junction temperature.

On-chip thermal protection circuitry disables the charge

pump action once the junction temperature exceeds the

thermal trip point, and re-enables the charge pump when the

junction temperature falls back to a safe operating point.

Typical Application Circuits

DS200219-33

FIGURE 2. Basic Buck/Boost Regulator

DS200219-15

FIGURE 3. Low Output Noise and Ripple Buck/Boost Regulator

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