Datasheet > 1937

1937

更新时间： 2022-09-12 00:33:02

品牌	Logo	应用领域
捷特科 - ZETEX		驱动器开关
页数	文件大小	规格书
16页	222K
描述
ADJUSTABLE LED DRIVER WITH INTERNAL SWITCH IN TSOT23-5

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1937 数据手册

ZXLD1937

ADJ USTABLE LED DRIVER WITH INTERNAL SWITCH IN TSOT23-5

DESCRIPTION

The ZXLD1937 is a PFM inductive boost converter Output current can be adjusted by applying a PWM

designed for driving 2, 3 or 4 series connected white control signal to the 'Enable' pin. Depending upon the

LEDs from a Li-Ion cell and up to 8 LEDs from a 5V control frequency, this will provide either a continuous

supply. The device operates from an input supply of o r a ' ch o p p e d ' o u tp u t cu rre n t. Th e PWM filte r

between 2.5V and 5.5V and provides an adjustable com ponents are contained within the chip.

output current of up to 50m A.

The device is assem bled in the TSOT23-5 pin package

with 1m m m axim um height profile.

The ZXLD1937 includes the output switch and peak

cu rre n t s e n s e re s is to r, a n d ca n o p e ra te w ith

m axim um 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

APPLICATIONS

• True Analog Dim m ing via PWM

• Mobile phones

• Digital cam eras

• PDAs

FEATURES

• 1m m height profile TSOT23-5 pin package

• Internal PWM filter for flicker free output

• High efficiency (80% typ)

• LCD m odules

• Portable internet appliances

• Palm top com puters

• Wide input voltage range: 2.5V to 5.5V

• Up to 50m A output current

• Low quiescent current: (60␮A typ)

• 500nA m axim um shutdown current

• Up to 1MHz switching frequency

• Low external com ponent count

• Inherently m atched LED currents

TYPICAL APPLICATION CIRCUIT

PIN CONNECTIONS

ISSUE 1 - J ULY 2004

S E M IC O N D U C T O R S

12 3 4 5 6 7...16

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