LTC3452 Linear Technology, LTC3452 Datasheet - Page 7

• Manufacturer Part Number: LTC3452
• Description: Synchronous Buck-Boost MAIN/CAMERA White LED Driver
• Manufacturer: Linear Technology

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