LTC3453 データシートの表示（PDF） - Linear Technology

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LTC3453

Synchronous Buck-Boost High Power White LED Driver

Linear Technology 

BLOCK DIAGRA

OPTIONAL

LTC3453

OPTIONAL

VIN

2.7V TO 5.5V

PVIN

16

1 VIN

UNDERVOLTAGE

LOCKOUT

UV

SWITCH A

15

SW1

14

SW2

SWITCH D

SWITCH B

GATE

DRIVERS

AND

ANTICROSS-

CONDUCTION

SWITCH C

OVERTEMP

PROTECTION

BANDGAP

REFERENCE

OT

1.23V

1612mA

FORWARD

CURRENT

LIMIT

+

–

REVERSE

CURRENT

LIMIT

200mA

+

LOGIC

–

AB PWM

COMPARATOR

UV

CD PWM

COMPARATOR

OT

VC

12

ISET1

3

RISET1

ISET2

10

RISET2

EN1

2

EN2

11

VBIAS

VFB

LED CURRENT

SETTING AMP 1

800mV

+

–

1MHz

OSCILLATOR

MAIN

–

ERROR AMP

SAFETY

ERROR AMP

+

1.23V

SOFT

START

CLAMP

∑

ILED

384

VOUT

1.23V

327k

123k

800mV

LED CURRENT

+ SETTING AMP 2

ILED

384

–

SHUTDOWN

GND

5

GND

8

EXPOSED PAD (PGND)

17

VOUT

13

VOUT

LED1

4

LED

DETECT

LED2

6

LED

DETECT

LED3

7

LED

DETECT

LED4

9

LED

DETECT

OR

4

6

7

9

3453 BD

3453fa

5

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