Datasheet > ZCC1937

ZCC1937

更新时间： 2024-11-14 05:34:39

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ZCC1937 数据手册

ZCC1937

White LED

Step-Up Converter in

SC70 and ThinSOT

FEATURES

DESCRIPTION

The ZCC1937 is

a step-up DC/DC converter

Inherently Matched LED Current

specifically designed to drive white LEDs with

constant current. The device can drive two,

ꢀ

High Efficiency: 84% Typical

ꢀ

Drives Up to Four LEDs from

3.2V Supply

three or four LEDs in series from

a Li-Ion cell.

ꢀ

Drives Up to Six LEDs from

36V Rugged Bipolar Switch

Fast 1.2MHz Switching Frequency

Uses Tiny 1mm Tall Inductors

a 5V Supply

Series connection of the LEDs provides iden-

tical LED currents resulting in uniform

brightness and eliminating the need for

ballast resistors. The ZCC1937 switches at

1.3MHz, allowing the use of tiny external

Requires Only 0.22

μF

Output Capacitor

components. The output capacitor can be as

small as 0.22 F, saving space and cost

versus alternative solu-tions. low 95mV

ꢀ

Low Profile SC70 and ThinSOT

Packaging

APPLICATIONS

Cellular Phones

PDAs, Handheld Computers

feedback voltage minimizes power loss in the

current setting resistor for better efficiency.

Digital Cameras

MP3 Players

GPS Receivers

The zcc1937 is available in low profile SC70 and

ThinSOT packages.

TYPICAL

APPLICA

TION

Conversion

22μH

3V TO 5V

0.22μF

LED

15mA

= 3V

3.6V

ZCC1937

SHDN

LED

OFF ON

6.34

GND

1937 F01a

C1, C2: X5R OR X7R DIELECTRIC

D1: CENTRAL SEMICONDUCTOR CMDSH-3

L1: MURATA LQH3C-220 OR EQUIVALENT

LED CURRENT (mA)

Figure 1. Li-Ion Powered Driver for Three

White LEDs

1937 TA01b

1937f

12 3 4 5 6 7...12

中文翻译

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