DEVICE DESCRIPTION

The ZXSC310 is a single or multi cell LED driver

designed for LCD backlighting applications. The input

voltage range of the device is between 0.8V and 8V.

This means the ZXSC310 is compatible with single

NiMH, NiCd or Alkaline cells, as well as multi-cell or

LiIon batteries.

The device features a shutdown control, resulting in a

standby current less than 5µA, and an output capable

of driving serial or parallel LED’s. The circuit generates

constant power output, which are ideal for driving

single or multiple LED’s over a wide range of operating

voltages. These features make the device ideal for

driving LED’s particularly in LCD backlight applications

for Digital Still cameras and PDA’s.

FEATURES

• 94% efficiency

• Minimum operating input voltage 0.8V

• Maximum operating input voltage 8V

• Standby current less than 5µA

• Programmable output current

• Series or parallel LED configuration

• Low saturation voltage switching transistor

• SOT23-5 package

APPLICATIONS

• LCD backlights:

Digital still camera

PDA

Mobile phone

• LED flashlights and torches

• White LED driving

• Multiple LED driving

The ZXSC310 is a PFM DC-DC controller IC that drives

an external Zetex switching transistor with a very low

saturation resistance. These transistors are the best

switching devices available for this type of conversion

enabling high efficiency conversion with low input

voltages. The drive output of the ZXSC310 LED driver

generates a dynamic drive signal for the switching

transistor.

The circuit can start up under full load and operates

down to an input voltage of 0.8 volts. The solution

configuration ensures optimum efficiency over a wider

range of load currents; several circuit configurations

are possible depending on battery life versus

brightness considerations.

The ZXSC310 is offered in the SOT23-5 package which,

when combined with a SOT23 switching transistor,

generates a high efficiency small size circuit solution.

The IC and discrete combination offers the ultimate

cost Vs performance solution for LED backlight

applications.

ZXSC310

ISSUE 3 - SEPTEMBER 2007

1

SEMICO NDUC TORS

LED DRIVER SOLUTION FOR LCD BACKLIGHTING

V

=3.3V/5V

DRIVE

Gnd

S

TDN

TYPICAL APPLICATIONS CIRCUIT

DEVICE

REEL

SIZE

TAPE

WIDTH

QUANTITY

PER REEL

ZXSC310E5TA

180mm

8mm

3000

ORDERING INFORMATION

DEVICE MARKINGS

• C310

Package SOT23-5