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LTC3454 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3454
Description  1A Synchronous Buck-Boost High Current LED Driver
PDF  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3454 Datasheet(HTML) 6 Page - Linear Technology

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LTC3454
6
3454fa
BLOCK DIAGRAM
LED
EN2
2
EN1
ISET2
ISET1
RISET2
RISET1
1
800mV
IISET1
LED CURRENT
SETTING AMP 1
SAFETY
ERROR AMP
FORWARD
CURRENT
LIMIT
REVERSE
CURRENT
LIMIT
AUTOZEROING
ERROR AMP
CD PWM
COMPARATOR
AB PWM
COMPARATOR
–
+
–
+
–
+
1.23V
1.23V
+
–
+
–
9
LOGIC
3.4A
275mA
UNDERVOLTAGE
LOCKOUT
UV
VIN
2.7V TO 5.5V
OVERTEMP
PROTECTION
OT
UV
OT
BANDGAP
REFERENCE
1.23V
1MHz
OSCILLATOR
SWITCH A
VIN
OPTIONAL
SW1
SW2
SWITCH D
SWITCH B
SWITCH C
VOUT
10
6
11
VOUT
7
VC
8
3
3454 BD
377k
123k
I
R
EXPOSED PAD (GND)
R
3850 I
800mV
LED CURRENT
SETTING AMP 2
–
+
IISET2
SHUTDOWN
4
OPTIONAL
∑
5
SOFT-
START
CLAMP
CURRENT
MIRROR
GATE
DRIVERS
AND
ANTICROSS-
CONDUCTION



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