BASIC CIRCUITRY METHOD AND FEATURES

WHITE LED DRIVERS

W-6137

W-5200-5

W-5626

W-6238

Driver to Five (Max.) High-Brightness white LEDs

Driver to Six High-Brightness White LEDs (I2C control)

Driver to Ten (Max.) High-Brightness white LEDs

L: Murata LQH32CN220

VIN

VIN

SW

FB

GND

SHDN

Vfb = 300 mV

20 mA

R1

15

Ω

OFF

ON

2.2 V to

5.5 V

C1

C2

L

D

VOUT

22

μH

1

μF

0.22

μF

D: Central CMDSH2-3 (rated 30V)

W-6137

W-5626

VIN

VIN

VOUT

EN

SDA

SCL

GND

LEDA1

pair A

pair B

pair C

COUT

20 mA

LEDA2

LEDB1

LEDB2

LEDC1

LEDC2

C1–

C1+

C2–

C2+

3 V to

5.5 V

Cin

ENABLE

I2C INTERFACE

1

μF1μF

1

μF1μF

VIN

W-6238

VIN

L

D

VOUT

R1

15

20 mA

(300mV)

4.7F

C1

0. 22 F

C2

FB

SHDN

SW

GND

ON

47 H

OFF

L: Sumida CDC5D23B-470

D: Central CMDSH05-4

C2: Taiyo Yuden UMK212BJ224 (rated 50V)

5

3

1

2

IN

OUT

SGND

100

100

100

100

W-5200 5

Apply PWM Waveform for

Adjustable Brightness Control

3 V to 4.4 V

i ion

Battery

t

Drive up to 5 LEDs

100

+

1 F

1 F

46

C

C+

1 F

SHDN

ON OFF