Datasheet

LT3746
12
3746fa
For more information www.linear.com/3746
block DiagraM
48
5150 4647
1
23 49 24 22 21 19
C
SS
C
VCC
R
FB2
R
FB1
V
CC
V
CC
SS
ISN RTISP SYNC
12µA
EN/UVLO FB PWMCK LDI SDI
OT
STATUS
INFO
(FAULT
LED
XX
)
x
SCKI
SCKI
PRECHG
V
SS
< 1V
(V
IN
- V
CAP
)
V
IN
V
IN
C
IN
R
S
M1
L
D1
GATE
CAP
6.8V
1.205V
I
SET
T
SET
V
PTAT
I
REF
OT
UV
1.205V
+ –
REFERENCE BIAS
AND UVLO
RAMP OSC
S R
Q
+
–
+ –
+
–
R
T
DRIVER
G
M1
+
–
53 54 52
C
CAP
C
OUT
V
OUT
PG
POR
G
M2
0.5V LED
00
LED
01
LED
31
EN
+ – –
. . .
–
28 26 25
LDO SDO SCKO
C0
SHIFT
REGISTER
C1
384384
32X
DELAY
32X
FS FS
SDI
SCKO
SDO
FS
EN
GS REGISTER DC REGISTER
12-BIT PWM
DIMMING
CONSTANT CURRENT
SINK
6-BIT DOT
CORRECTION
OPEN/SHORT
LED
12 12
6 6
FAULT LED
XX
PWMCK
I
REF
LED
XX
GND
3746 BD
(18, 20, 27, 29, EXPOSED PAD 57)
56 55
+
–
+
–
R
ISET
R
TSET
S R
Q