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LDS8868 Datasheet(PDF) 8 Page - IXYS Corporation

Part No. LDS8868
Description  6-Channel Ultra Low Dropout LED Driver
Download  14 Pages
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Manufacturer  IXYS [IXYS Corporation]
Direct Link  http://www.ixys.com
Logo IXYS - IXYS Corporation

LDS8868 Datasheet(HTML) 8 Page - IXYS Corporation

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LDS8868
© 2009 IXYS Corp.
8
Doc. No. 8868_DS, Rev. N2.1
Characteristics subject to change without notice
PIN DESCRIPTION
Pin #
Name
Function
1
LEDC2
LEDC2 cathode terminal
2
LEDC1
LEDC1 cathode terminal
3
LEDB2
LEDB2 cathode terminal
4
LEDB1
LEDB1 cathode terminal
5
LEDA2
LEDA2 cathode terminal
6
LEDA1
LEDA1 cathode terminal
7
VOUT
Charge pump output connected to the LED anodes
8
VIN
Charge pump input, connect to battery or supply
9
C1+
Bucket capacitor 1 Positive terminal
10
C1-
Bucket capacitor 1 Negative terminal
11
C2+
Bucket capacitor 2 Positive terminal
12
C2-
Bucket capacitor 2 Negative terminal
13, 14
GND
Ground Reference
15
GND
Ground Reference
16
EN/SET Device enable (active high) and Dimming Control
Top view: TQFN 16-lead 3 X 3 mm
TAB
TAB
Connect to GND on the PCB
PIN FUNCTION
VIN is the supply pin for the charge pump. A small 1μF
ceramic bypass capacitor is required between the VIN
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.
VOUT is the charge pump output that is connected to
the LED anodes. A small 1μF ceramic bypass
capacitor is required between the VOUT pin and
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
enter
high-impedance
zero
current
state
whenever the device is in shutdo wn 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


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