LTC3452
BLOCK DIAGRA
V IN
2.7V TO 5.5V
V OUT
1
V IN
PV IN
20
SW1
19
SW2
17
16
V OUT
4
UNDERVOLTAGE
LOCKOUT
UV
SWITCH
A
SWITCH
D
LED
DETECT
LED L1
OVERTEMPERATURE
PROTECTION
OT
SWITCH
B
GATE
DRIVERS
AND
SWITCH
C
LED
DETECT
5
LED L2
ANTI-CROSS-
LOW
BANDGAP
REFERENCE
1.23V
+
FORWARD CONDUCTION
CURRENT
LIMIT
REVERSE
CURRENT
LIMIT
+
LED
6
LED L3
POWER
LED
BANK
DETECT
1600mA
200mA
7
+
AB PWM
COMPARATOR
LOGIC
CD PWM
COMPARATOR
+
LED
DETECT
LED L4
UV
1MHz
OSCILLATOR
OT
LED
DETECT
8
LED L5
V C
15
MAIN
SAFETY
1.23V
V BIAS
V FB
+
ERROR AMP
ERROR AMP
+
V OUT
327k
123k
1.23V
SOFT-START
CLAMP
800mV
+
LOW POWER
LED CURRENT
SETTING AMP
I MAXL
256
I SETL
R ISETL
3
SDL
EXPONENTIAL
BRIGHTNESS
CONTROL
8 LEVELS
SDL
LED
10
LED H1
HIGH
POWER
EN L 2
EN H 14
800mV
+
HIGH POWER
LED CURRENT
SETTING AMP
SHUTDOWN
CIRCUIT
SDH
SHUTDOWN
DETECT
LED
DETECT
12
LED H2
LED
BANK
I MAXH
I SETH
13
768
R ISETH
SDH
9
GND
11
GND
18
PGND
21
EXPOSED
3452 BD
PAD
3452f
7
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