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ISL97691
Pin Configuration
ISL97691
(16 LD 3mmx3mm TQFN )
TOP VIEW
AGND 1
16
15
14
13
12 OVP
COMP 2
ISET 3
THERMAL
PAD
11 FSW
10 PGND
1-WIRE_1 4
9
LX
5
6
7
8
Pin Description
PIN NUMBER
1
2
3
4
5
6
PIN NAME
AGND
COMP
ISET
1-WIRE_1
1-WIRE_2
PWMI_1
I/O
S
I
I
I
I
I
DESCRIPTION
Analog Ground for precision circuits.
External compensation. Fit a series RC comprising 12k ? and 15nF from COMP to GND.
Channel current setting. The LED channel current is adjusted from 15mA to 60mA with resistor R SET
from ISET pin to GND.
1-Wire interface 1 for controlling channels 1 and 2 with 6-bit analog dimming.
1-Wire interface 2 for controlling channels 3 and 4 with 6-bit analog dimming.
PWM Input 1 for controlling channels 1 and 2 PWM dimming. During the PWM Off period, the
1-WIRE_1 data will remain at the previous programmed level.
7
PWMI_2
I
PWM Input 2 for controlling channels 3 and 4 PWM dimming. During the PWM Off period, the
1-WIRE_2 data will remain at the previous programmed level.
8
9
10
11
VIN
LX
PGND
FSW
I
O
S
I
Input supply voltage.
Input to boost switch.
Power ground (LX, C IN , and C OUT power return).
Switching Frequency Adjustment. The boost switching frequency is adjusted from 400kHz to 1.5MHz
with resistor R FSW from FSW pin to GND.
12
13
14
15
16
OVP
CH1
CH2
CH3
CH4
EPAD
I
I
I
I
I
X
Overvoltage protection input.
Channel 1 current sink and channel monitoring. Tie pin to GND if channel unused.
Channel 2 current sink and channel monitoring. Tie pin to GND if channel unused.
Channel 3 current sink and channel monitoring. Tie pin to GND if channel unused.
Channel 4 current sink and channel monitoring. Tie pin to GND if channel unused.
No electrical connection but should be used to connect PGND and AGND. For example, uses top plane
as PGND and bottom plane as AGND with vias on EPAD to allow heat dissipation and minimum noise
coupling from PGND to AGND operation.
3
FN7840.1
February 1, 2013
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