LDS8680

© 2009 IXYS Corp.

6

Doc. No. 8680_DS, Rev. N1.0

Characteristics subject to change without notice

PIN DESCRIPTION

Pin #

Name

Function

1

Charge pump input, connect to battery or supply

2

C1+

Flying capacitor 1 Positive terminal

3

C1-

Flying capacitor 1 Negative terminal

4

EN/SET Device enable (active high) and Dimming Control

5

LEDB

LEDB cathode terminal

6

LEDA

LEDA cathode terminal

7

GND

Ground Reference

8

Charge pump output connected to the LED anodes

PAD

PAD

Connect to GND on the PCB

Top view: TDFN 8-lead 2 X 3 mm

PIN FUNCTION

1

μF ceramic bypass capacitor is required between

operating input voltage range is from 2.7 V to 5.5 V. If

channels disable and the device enters shutdown

mode.

EN/SET is the enable and one wire addressable

control logic input for all LED channels. Guaranteed

levels of logic high and logic low are set at 1.4 V and

0.4 V respectively. When EN/SET is initially taken

high, the device becomes enabled and all LED

currents remain at 0 mA. To start LED current, device

should be in PWM mode (See p. 5). To place the

device into zero current mode, the EN/SET pin must

be held low for more than 50 ms.

the LED anodes. A small 2.2

μF ceramic bypass

ground near the device.

GND is the ground reference for the charge pump.

The pin must be connected to the ground plane on

the PCB.

C1+, C1- are connected to each side of the ceramic

flying capacitor C1

LEDA, LEDB provides the internal regulated current

source for each of the LED cathodes. These pins

enter high-impedance zero current state whenever

the device is in shutdown mode.

PAD is the exposed pad underneath the packag e.

For best thermal performance, the pad should be

soldered to the PCB and connected to the ground

plane