Datasheet

LT3746
25
3746fa
For more information www.linear.com/3746
where I
VIN
is the power input V
IN
quiescent current, I
VCC
is the V
CC
supply current, and V
LEDn
is the LED pin volt-
age for channel n.
Fr
om the total power dissipation P
TOTAL
, the junction
temperature T
J
can be calculated as:
T
J
= T
A
+P
TOTAL
• θ
JA
applicaTions inForMaTion
Keep T
J
below the maximum operating junction tempera-
ture 125°C.
Typical applicaTion
Figure 7. 32-Channel LED Driver, 500kHz Buck, 1 LED 10mA to 30mA per Channel, 100Hz 12-Bit Dimming
EN/UVLO
SYNC
RT
SS
V
CC
I
SET
T
SET
SCKI
SDI
LDI
SCKO
SDO
LDO
LED26
LED27
LED28
LED29
LED30
LED31
LED00
LED01
LED02
LED03
LED04
LED05
.
.
.
. . .
LT3746
100k
V
IN
10V TO 30V
EN
V
CC
3V TO 5.5V
V
IN
CAP
0.47µF
16V
M1
D1
GATE
GND
FB
ISP
ISN
4.7µF
50V
23.2k
10k
C1
220µF
L1
22µH
33mΩ
4V MAXIMUM OUTPUT VOLTAGE
PWMCK
TTL/CMOS
M1: VISHAY Si9407BDY
D1: DIODES DFLS160
L1: WÜRTH ELECTRONIK 7447779122
C1: SANYO 6TPE220MI
409.6kHz CLOCK
TTL/CMOS
3746 TA02
10µF
10V
105k
10nF
60.4k
32.4k