LTC3454 データシートの表示（PDF） - Linear Technology

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LTC3454

1A Synchronous Buck-Boost High Current LED Driver

Linear Technology 

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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