ZXLD1100H6TC View Datasheet(PDF) - Zetex => Diodes

Part Name

Description

Manufacturer

ZXLD1100H6TC

ADJUSTABLE LED DRIVER WITH INTERNAL SWITCH AND OPEN CIRCUIT PROTECTION IN SC70-6

Zetex => Diodes 

ZXLD1100

ADJUSTABLE LED DRIVER WITH INTERNAL SWITCH AND OPEN

CIRCUIT PROTECTION IN SC70-6

DESCRIPTION

The ZXLD1100 is a PFM inductive boost converter

designed for driving 2, 3 or 4 series connected white

LEDs from a Li-Ion cell and up to 8 LEDs from a 5V

supply. The device operates from an input supply of

between 2.5V and 5.5V and provides an adjustable

output current of up to 50mA.

The ZXLD1100 includes the output switch and peak

current sense resistor, and can operate with a

maximum output voltage of 28V.

Quiescent current is typically 60␮A and a shutdown

function is provided to reduce this current to less than

500nA in the 'off' state.

Output current can be adjusted by applying a PWM

control signal to the 'Enable' pin. Depending upon the

control frequency, this will provide either a continuous

or a 'chopped' output current. The PWM filter

components are contained within the chip.

The ZXLD1100 contains an internal avalanche diode to

protect the output switch. This allows the device to

operate indefinitely if the load is open circuit. Input

supply current during this condition is less than 1mA.

The device is assembled in a low profile SC70-6 pin

package with industry standard pinout.

ADVANCED FEATURES

• Internal 30V NDMOS switch, current sense and

open circuit protection

• True Analog Dimming via PWM

FEATURES

• Low profile SC70 6 pin package

• Internal PWM filter for flicker free output

• High efficiency (80% typ)

• Wide input voltage range: 2.5V to 5.5V

• Up to 50mA output current

• Low quiescent current: (60␮A typ)

• 500nA maximum shutdown current

• Up to 1MHz switching frequency

• Low external component count

• Inherently matched LED currents

APPLICATIONS

• Mobile phones

• Digital cameras

• PDAs

• LCD modules

• Portable internet appliances

• Palmtop computers

TYPICAL APPLICATION CIRCUIT

PIN CONNECTIONS

ISSUE 4 - JULY 2004

1

SEMICONDUCTORS

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