LTC3453 datasheet(4/12 Pages) LINER

4 / 12 page

LTC3453

3453fa

PI FU CTIO S

VIN (Pin 1): Signal Voltage Input Supply Pin [2.7V ≤ VIN ≤

5.5V]. Recommended bypass capacitor to GND is 2.2

µF

ceramic or larger. Connect to PVIN (Pin 16).

EN1 (Pin 2): Enable Input Pin for ISET1 Current.

ISET1 (Pin 3): White Led Current Programming Pin. A

resistor to ground programs each current source output to

ILED = 384(0.8V/RISET1). This amount of current adds to

any amount set by EN2/ISET2 if also used.

LED1 to LED4 (Pins 4, 6, 7, 9): Individual Low Dropout

Current Source Outputs for White LED Current Biasing.

Connect each white LED between VOUT and an individual

LEDx pin. Unused LEDx outputs should be connected to

VOUT.

GND (Pins 5 and 8): Signal Ground Pin. Connect to PGND

(Exposed Pad).

ISET2 (Pin 10): White Led Current Programming Pin. A

resistor to ground programs each current source output to

ILED = 384(0.8V/RISET2). This amount of current adds to

any amount set by EN1/ISET1 if also used.

EN2 (Pin 11): Enable Input Pin for ISET2 Current.

VC (Pin 12): Compensation Point for the Internal Error

Amplifier Output. Recommended compensation capacitor

to GND is 0.1

µF ceramic or larger.

VOUT (Pin 13): Buck-Boost Output Pin. Recommended

bypass capacitor to GND is 4.7

µF ceramic.

SW2 (Pin 14): Switching Node Pin. Connected to internal

power switches C and D. External inductor connects

between SW1 and SW2. Recommended value is 4.7

µH.

SW1 (Pin 15): Switching Node Pin. Connected to internal

power switches A and B. External inductor connects

between SW1 and SW2. Recommended value is 4.7

µH.

PVIN (Pin 16): Power Voltage Input Supply Pin. Connect to

VIN (Pin 1).

Exposed Pad (Pin 17): Power Ground Pin. Connect to

GND (Pin 8) and solder to PCB ground for optimum

thermal performance.

TYPICAL PERFOR A CE CHARACTERISTICS

Efficiency vs LED Current

Output Voltage Ripple

Startup Transient

LED CURRENT (mA)

100

350 400 450

300

3453 G07

150 200 250

500

FRONT PAGE APPLICATION

PLED/PIN, VIN = 3.6V, TA = 25°C

20mV/DIV

AC COUPLED

FRONT PAGE APPLICATION

VIN = 3.6V

ILED = 150mA

µs/DIV

3453 G08

CH1, VOUT

2V/DIV

CH2, EN1

1V/DIV

FRONT PAGE APPLICATION

VIN = 3.6V

ILED = 150mA

1ms/DIV

3453 G09

LTC3453 датащи(PDF) 4 Page - Linear Technology

LTC3453 датащи(HTML) 4 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12

датащи скачать

ссылки URL