LP3359

LP3359-datasheet

Ver.1.1

Nov.-2005

7

Connecting outputs in parallel does not affect internal

operation of the LP3359 and has no impact on the Electrical

Characteristics and limits previously presented. The available

diode output current, maximum diode voltage, and all other

specifications provided in the Electrical Characteristics table

apply to parallel output configurations, just as they do to the

standard 4-LED application circuit.

Power Consumption

×

the power consumption of the LP3359 Typical Application

Circuit.

Figure 7. 4LEDs, LED VF=2.7V, ILED=15mA Power Dissipation

The maximum allowable power dissipation that this

package is capable of handling can be determined as

follows:

Where T is the maximum junction temperature, T is the

thermal resistance of the specified package. The LP3359 come

in the DFN-8 package that has a junction-to-ambient thermal

dependant upon the layout of the PC board. The actual power

dissipated by the LP3359 follows the equation:

to the LEDX diode by the LP3359. Power dissipation must be

less than that allowed by the package. Please refer to the

Absolute Maximum Rating of the LP3359.

Input Capacitor Selection

The LP3359 is designed to run off of a fixed input voltage.

Depending on the stability and condition of this voltage rail, it

may be necessary to add a small input capacitor to help filter

out any noise that may be present on the line. In the event that

filtering is needed, surface mount multi-layer ceramic

capacitors are recommended. These capacitors are small and

inexpensive. A capacitance of 0.1µF is typically sufficient.