LTC3452 データシートの表示（PDF） - Linear Technology

部品番号

コンポーネント説明

メーカー

LTC3452

Synchronous Buck-Boost MAIN/CAMERA White LED Driver

Linear Technology 

BLOCK DIAGRA

VIN

2.7V TO 5.5V

VIN

1

PVIN

20

SW1 SW2

19

17

VOUT

16

VC 15

UNDERVOLTAGE

LOCKOUT

UV

SWITCH

A

SWITCH

D

SWITCH

SWITCH

OVERTEMPERATURE

PROTECTION

OT

B

C

GATE

DRIVERS

AND

ANTI-CROSS-

BANDGAP

REFERENCE

1.23V

FORWARD CONDUCTION REVERSE

CURRENT

CURRENT

+

LIMIT

LIMIT

+

1600mA –

– 200mA

AB PWM

COMPARATOR

+

LOGIC

CD PWM

COMPARATOR

+

–

UV

OT

–

1MHz

OSCILLATOR

VBIAS

–

VFB +

MAIN

ERROR AMP

1.23V

SAFETY

ERROR AMP

1.23V

–

VOUT

327k

+

123k

SOFT-START

CLAMP

ISETL

3

RISETL

ENL 2

ENH 14

ISETH

13

RISETH

800mV

LOW POWER

LED CURRENT

SETTING AMP

+

–

SDL

800mV

HIGH POWER

LED CURRENT

SETTING AMP

+

–

SDH

IMAXL

256

EXPONENTIAL

BRIGHTNESS

CONTROL

SHUTDOWN

CIRCUIT

8 LEVELS

SDL

SHUTDOWN

SDH

IMAXH

768

9

11

18

21

GND

GND

PGND EXPOSED

PAD

LTC3452

VOUT

4

LED

DETECT

LEDL1

5

LED

DETECT

LEDL2

6

LED

DETECT

LEDL3

7

LED

DETECT

LEDL4

8

LED

DETECT

LEDL5

LOW

POWER

LED

BANK

10

LED

DETECT

LEDH1

12

LED

DETECT

LEDH2

HIGH

POWER

LED

BANK

3452 BD

3452f

7

Share Link: