LTC3453 LINER [Linear Technology], LTC3453 Datasheet - Page 5

• Manufacturer Part Number: LTC3453
• Description: Synchronous Buck-Boost High Power White LED Driver
• Manufacturer: LINER [Linear Technology]

BLOCK DIAGRA
2.7V TO 5.5V
V
IN
R
R
ISET1
ISET2
16
12
10
11
1
2
3
PV
V
V
I
I
EN1
EN2
SET1
SET2
UNDERVOLTAGE
IN
C
PROTECTION
IN
REFERENCE
OVERTEMP
LOCKOUT
BANDGAP
800mV
800mV
W
LED CURRENT
SETTING AMP 1
OPTIONAL
UV
OT
1.23V
1612mA
+
–
+
–
V
BIAS
V
LED CURRENT
SETTING AMP 2
FB
SWITCH A
+
–
+
–
SWITCH B
COMPARATOR
FORWARD
CURRENT
–
+
LIMIT
AB PWM
1.23V
15
UV
ERROR AMP
SW1
MAIN
I
I
384
384
LED
LED
CONDUCTION
OSCILLATOR
ANTICROSS-
DRIVERS
LOGIC
GATE
1MHz
AND
SHUTDOWN
∑
5
GND
ERROR AMP
SAFETY
SW2
COMPARATOR
CLAMP
START
8
SOFT
CD PWM
OT
14
CURRENT
REVERSE
GND
LIMIT
SWITCH C
SWITCH D
–
+
+
–
+
–
17
1.23V
EXPOSED PAD (PGND)
200mA
V
OUT
327k
123k
OPTIONAL
DETECT
DETECT
DETECT
DETECT
LED
LED
LED
LED
LED1
LED2
LED3
LED4
LTC3453
V
OUT
3453 BD
13
4
6
7
9
V
4
6
7
9
OUT
OR
3453fa
5