3

Date: 11/15/05

SP6687 4Channel Charge Pump White LED Driver

© Copyright 2005 Sipex Corporation

Note 2: Current Matching refers to the difference in current from one LED to the next.

ELECTRICAL CHARACTERISTICS

FUNCTIONAL DIAGRAM

R

E

T

E

M

A

R

A

PN

I

MP

Y

TX

A

MS

T

I

N

US

N

O

I

T

I

D

N

O

C

d

l

o

h

s

e

r

h

T

h

g

i

H

t

u

p

n

I5

.

1V

d

l

o

h

s

e

r

h

t

c

i

g

o

L

h

g

i

H

t

u

p

n

I

)

2

L

R

T

C

,

1

L

R

T

C

,

0

L

R

T

C

,

N

E

(

d

l

o

h

s

e

r

h

T

w

o

L

t

u

p

n

I4

.

0V

d

l

o

h

s

e

r

h

t

c

i

g

o

L

w

o

L

t

u

p

n

I

)

2

L

R

T

C

,

1

L

R

T

C

,

0

L

R

T

C

,

N

E

(

t

n

e

r

r

u

C

h

g

i

H

t

u

p

n

I1

A

µV

H

I

V

=

N

I

t

n

e

r

r

u

C

w

o

L

t

u

p

n

I1

A

µV

L

I

D

N

G

=

d

l

o

h

s

e

r

h

T

n

w

o

d

t

u

h

S

l

a

m

r

e

h

T0

4

10

5

10

8

1C

º

s

i

s

e

r

e

t

s

y

H

n

w

o

d

t

u

h

S

l

a

m

r

e

h

T0

1C

º

X 100%

X 100%)

Note 1:

306mV

GND

LED1

VOUT

EN

ISET

LED2

LED3

LED4

CTRL0

CTRL1

CTRL2

Decoder

Bandgap

Mode

Decision

1x/1.5x/2x

Charge Pump

1MHz

1MHz

Oscillator

I-Setting

C1P C1N C2P C2N