Datasheet > PR4402

PR4402

更新时间： 2024-11-17 01:22:31

品牌	Logo	应用领域
其他 - ETC		/
页数	文件大小	规格书
12页	298K
描述
0.9V Boost Driver for White LEDs PR4401/4402 Requires Only One External Component

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PR4402 数据手册

LED DRIVER PR4401/PR4402

0.9V Boost Driver for White LEDs PR4401/4402

Requires Only One External Component

The PR4401 and PR4402* are single cell step-up converters for white LEDs operating

from a supply voltage of less than 0.9V. Only one external inductor is needed for operation

of a white LED. PR4401 is recommended for mean LED currents of up to 20mA, PR4402

for up to 40mA. This makes PR4401 and PR4402 ideal for use in low-cost or small-sized

applications such as LED flashlights or LCD backlighting for portable devices.

Features

Applications

• minimum startup voltage 0.9V

• 200/250mA peak output current

• only one external component required

• battery deep discharge protection

• Small-sized LED torches

• LCD backlighting

• LED indicator lights

The inductance L1 determines the LED

current:

Typical Application

Vbat =1.2V or 1.5V

Inductance L1 Mean current

for

PR4401

PR4401/4402

PR4402

47µH

32µH

6.5 mA

8.3 mA

10.8 mA

11 mA

Vcc

White

LED

Vout

26.7µH

22 µH

Gnd

PR4401/02

14.7 µH

10 µH

14 mA

22 mA

For output currents higher than 20mA an additional

blocking capacitor at Vcc is recommended.

6.8 µH *

32 mA *

4.7 µH *

40 mA *

* PR4402 only measured with inductor Murata type

LQH32C series

10-22µH: one white LED

4.7-6.8µH: two white LEDs in parallel

Pin Description

Vcc

PIN Name

Vcc

PIN Function Description

Supply voltage

Gnd

Vout

Output voltage, LED connection

Ground connection

Gnd

Vout

top view

Topside marking: "UI" (PR4401) or "UJ" (PR4402) with a two-digit lot code

Package SOT23-3 or COB on request

Page 1/12

Rev 0908

12 3 4 5 6 7...12

中文翻译

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