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X R P 7 6 1 8
8 - C h a n n e l C o n s t a n t C u r r e n t L i n e a r L E D D r i v e r W i t h
S m a r t T a l k T M
PIN DESCRIPTION
Name
CHx
NC
PWM
FBX
ISET
FB
SDB
SDBX
AGND
VCC
EN
PGND
EP
Pin Number
1, 2, 3, 4,
7, 8, 9, 10
12
11
13
14
15
16
17
18
19
20
5, 6
Exposed Pad
Description
CH1 to CH8 pins
Connect an LED between each pin and LED supply rail voltage (V LED ). Current value is
controlled by R SET . Connect unused channel(s) to GND.
Not Connected
PWM pin
This must be held HIGH to enable the output drivers. It can be used for PWM dimming
up to 25kHz. If not used, connect to V CC .
FBX input pin
Used in parallel configuration as an interface terminal by connecting it to FB pin of the
next XRP7618. If not used, leave it unconnected.
ISET pin
Connect resistor R SET from this pin to ground to set LED channel current as per
I CHANNEL =1.194x400/R SET
FB pin
Samples the LED cathode voltage on each channel and outputs the lowest voltage to the
step-up converter.
SDB output pin
SDB signal is synchronous with the PWM signal during PWM Dimming. It outputs low
logic to the step-up converter under conditions such as shutdown or when all channels
are inactive.
SDBX input pin
Used in parallel configuration as an interface terminal by connecting it to SDB pin of the
next XRP7618. If not used, connect it to GND.
Ground pin
Input Voltage pin
Must be closely decoupled to GND pin with a 0.1μF ceramic capacitor.
Enable pin
This pin must be held HIGH to enable the XRP7618.
Ground pin
Exposed Pad
Connect to ground
ORDERING INFORMATION
Part Number
Temperature
Range
Marking
Package Packing Quantity
Note 1
Note 2
XRP7618IGB-F
XRP7618IGBTR-F
- 40°C≤T A ≤+85°C
EXAR
XRP7618IGB
YYWWF
XXXX
TSSOP-20
Bulk
1.5K/Tape & Reel
Halogen Free
RoHS Compliant
Exposed Pad
XRP7618EVB
XRP7618 Evaluation Board
“YY” = Year – “WW” = Work Week – “X” = Lot Number , when applicable.
? 2013 Exar Corporation
4/10
Rev. 1.2.0
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