ZXLD1937ET5TA【PDF 1/16 页】IC LED DRIVR WHITE BCKLGT TSOT-5

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Closest Alternative is AP5724WUG-7

ZXLD1937

ADJUSTABLE LED DRIVER WITH INTERNAL SWITCH IN TSOT23-5

DESCRIPTION

The ZXLD1937 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 ZXLD1937 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.

ADVANCED FEATURES

? True Analog Dimming via PWM

FEATURES

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 device is assembled in the TSOT23-5 pin package

with 1mm maximum height profile.

APPLICATIONS

? Mobile phones

? Digital cameras

1mm height profile TSOT23-5 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

? PDAs

? LCD modules

? Portable internet appliances

? Palmtop computers

TYPICAL APPLICATION CIRCUIT

PIN CONNECTIONS

ISSUE 1 - JULY 2004

SEMICONDUCTORS

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