LDS8868 IXYS Corporation, LDS8868 Datasheet - Page 8

• Manufacturer Part Number: LDS8868
• Description: Lds8868 6-channel Ultra Low Dropout Led Driver
• Manufacturer: IXYS Corporation

LDS8868
PIN DESCRIPTION
PIN FUNCTION
V
ceramic bypass capacitor is required between the V
pin and ground near the device. The operating input
voltage range is from 2.5V to 5.5V. Whenever the
input supply falls below the under-voltage threshold
(2.2 V), all the LED channels are disabled 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 1.3V and
0.4V respectively. When EN/SET is initially taken
high, the device becomes enabled and all LED
currents remain at 0mA. To place the device into zero
current mode, the EN/SET pin must be held low for
more than 1.5ms.
V
the LED anodes. A small 1
© 2009 IXYS Corp.
Characteristics subject to change without notice
IN
OUT
13, 14
Pin #
TAB
10
11
12
15
16
is the supply pin for the charge pump. A small 1
1
2
3
4
5
6
7
8
9
is the charge pump output that is connected to
EN/SET Device enable (active high) and Dimming Control
LEDC2 LEDC2 cathode terminal
LEDC1 LEDC1 cathode terminal
LEDB2 LEDB2 cathode terminal
LEDB1 LEDB1 cathode terminal
LEDA2 LEDA2 cathode terminal
LEDA1 LEDA1 cathode terminal
Name
GND
GND
V
C1+
C2+
TAB
C1-
C2-
V
OUT
IN
Charge pump output connected to the LED anodes
Charge pump input, connect to battery or supply
Bucket capacitor 1 Positive terminal
Bucket capacitor 1 Negative terminal
Bucket capacitor 2 Positive terminal
Bucket capacitor 2 Negative terminal
Ground Reference
Ground Reference
Connect to GND on the PCB
μ
F ceramic bypass
Function
μ
F
IN
8
capacitor is required between the V
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
bucket capacitor C1
C2+, C2- are connected to each side of the ceramic
bucket capacitor C2
LEDA1 – LEDC2 provide the internal regulated
current source for each of the LED cathodes. These
pins
whenever the device is in shutdown mode.
TAB is the exposed pad underneath the package.
For best thermal performance, the tab should be
soldered to the PCB and connected to the ground
plane
enter
high-impedance
Top view: TQFN 16-lead 3 X 3 mm
Doc. No. 8868_DS, Rev. N2.1
zero
current
OUT
pin and
state