© 2010 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN5776

• Rev. 1.1.0

3

Pin Configuration

C1

B1

A1

A2

C3

B3

A3

C2

LED1

SW

EN45

LED4

ISET

B2

VOUT

EN13

VIN

LED2

D1

D3

D2

GND

LED5

LED3

C3

B3

A3

A2

C1

B1

A1

C2

B2

D3

D1

D2

Figure 2.

Top View (Bumps Face Down)

Figure 3.

Bottom View (Bumps Face Up)

Pin Definitions

Pin #

Name

Description

A1

VIN

Input voltage

A2

ISET

the current for the LED strings.

A3

LED1

LED string #1 output

B1

EN13

Enable/PWM pin for LED1, LED2, and LED3. A logic LOW on this pin turns off the LED drivers in

LED1, LED2, and LED3. The IC goes to shutdown 30 ms after both enable pins (EN13 and EN45)

are set LOW. It is connected to an internal pull-down resistor of 250 k

Ω.

B2

EN45

Enable/PWM pin for LED4 and LED5. A logic LOW on this pin turns off the LED drivers in LED4

and LED5. The IC goes to shutdown 30 ms after both enable pins (EN13 and EN45) are set LOW.

It is connected to an internal pull-down resistor of 250 k

Ω.

B3

LED2

LED string #2 output

C1

GND

Ground. All power and analog signals are referenced to this pin.

C2

LED5

LED string #5 output

C3

LED3

LED string #3 output

D1

SW

Switching Node. Tie inductor L1 from VIN to this pin.

D2

VOUT

Boost output voltage used to supply the LED current sources. This voltage is regulated to the

minimum value required to ensure adequate voltage across all active LED current sources.

D3

LED4

LED string #4 output