LTC3454 查看數據表（PDF） - Linear Technology
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LTC3454 Datasheet PDF : 12 Pages
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LTC3454
BLOCK DIAGRAM
OPTIONAL
OPTIONAL
VIN
2.7V TO 5.5V
VIN
9
UNDERVOLTAGE
LOCKOUT
OVERTEMP
PROTECTION
BANDGAP
REFERENCE
SWITCH A
10
SW1
6
SW2
SWITCH D
GATE
DRIVERS
AND
SWITCH B
ANTICROSS-
SWITCH C
UV
CONDUCTION
OT
3.4A
1.23V
FORWARD
CURRENT
+
LIMIT
–
+
LOGIC
REVERSE
CURRENT
LIMIT
275mA
VOUT
7
–
AB PWM
COMPARATOR
UV
CD PWM
COMPARATOR
OT
VC
8
ISET1
3
RISET1
ISET2
4
RISET2 1 EN1
EN2
2
1MHz
OSCILLATOR
VOUT
1.23V
–
377k
+
SAFETY
ERROR AMP
AUTOZEROING
ERROR AMP
123k
1.23V
SOFT-
START
CLAMP
800mV
LED CURRENT
SETTING AMP 1
+
–
800mV
LED CURRENT
+ SETTING AMP 2
–
IISET1
∑
IISET2
CURRENT
MIRROR
I
3850 I
LED
5
R
R
SHUTDOWN
EXPOSED PAD (GND)
11
3454 BD
6
3454fa
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