Feb27-07 Rev K

Integrated White LED Driver With Organic LED Display Power Supply

© 2007 Sipex Corporation

Applications



White LED Back-Lighting



Hand-held Devices



Digital Cameras



Flip-phones / Clam-shell Cellular Phones



High-fashion cellular phones

Figure 2. 4 LEDs for Main Panel and 3 LEDs for SUB Panel

Figure . Main LEDs Display and OLED SUB Display

23

.

1

1

2

1

×

















+

=

SUB

SUB

SUB

R

R

V

FB

SW

GND

L

D

S

P6415

OVP

R

SUB

FB2

CH2

SEL

CH

0µH

Main Display

OLED

SUB

Display

0V

>.5V

V

IN

2.7V~4.2V

C

IN

4.7µF

EN

C

OUT

4

.7µF

ILED=

0.2

R

FB

ILED

Main

47p

F

FB

SW

GND

L

D

SP6415

OVP

FB2

CH2

SEL

CH

0µH

Main Display

4.7µF

V

SUB

0V

>.5V

4.7µF

4.7µF

2.7V~4.2V

EN

ILED2

ILED=

0.2

ILED

ILED2=

.23

R

FB2

Main

DFN-10

(3mmx3mmx0.85mm)

Top View



8

7



2

3

4

S

P6415

5

6

0

SP6415

TYPICAL APPLICATION CIRCUIT

DESCRIPTION

Solved by

TM

Integrated White LED Driver With

Organic LED Display Power Supply

Integrated OLED and White-LED Driver

Wide Input Voltage Range: 2.7V to 5.5V

Adjustable output voltage up to 20V

Complete Protection: OVP, OTP, UVP

PWM Dimming Control

Small External Components

Cycle-By-Cycle Current Limit

Lead Free, RoHS Compliant

Packaging: 0Pin DFN

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•

•

•

•

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•

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The SP645 is a dual Boost DC/DC converter, designed to drive up to 4 white LEDs with a constant cur-

rent and to power an organic LED display with a constant voltage. According to the SEL pin status, the

SP6415 either regulates output current flowing through series connected LEDs or regulates output volt-

age applying to the OLED. A single external resistor is used to set the maximum LED current. The LED

current can be adjusted by applying a PWM signal to the EN pin. Pulling the EN pin to GND disables the

chip and reduces the supply current to less than uA. Additional features include a low-side NFET switch

that can turn off the LED string with no DC current path to ground. Other features include OVP, OCP,

UVP and OTP. The SP645 is available in a small (3mmx3mmx0.85mm) DFN-0 package.