音影先锋亚洲天堂网|电影世界尽头的爱完整版播放|国产 熟女 91|高清无码免费观看欧美日韩|韩国一区二区三区黄色录像|美女亚洲加勒比在线|亚洲综合网 开心五月|7x成人在线入口|成人网站免费日韩毛片区|国产黄片?一级?二级?三级

LM3570 Datasheet

  • LM3570

  • Low Noise White LED Driver System

  • 13頁

  • NSC

掃碼查看芯片數(shù)據(jù)手冊(cè)

上傳產(chǎn)品規(guī)格書

PDF預(yù)覽

LM3570 Low Noise White LED Driver System
July 2004
LM3570
Low Noise White LED Driver System
General Description
The LM3570 device provides a complete LED driver solution
for wireless handsets and other portable devices using a
display and keypad. With three constant current sources, up
to three white LEDs can be used for display lighting with
excellent current matching (0.3% typ.). The regulated 4.35V
output voltage is perfect for driving auxiliary keypad LEDs in
voltage mode.
The LM3570 utilizes a high efficiency 3/2 CMOS charge-
pump with a pre-regulation loop that minimizes conducted
noise on the input. It accepts an input voltage range from
2.7V to 5.5V and maintains a constant current determined by
the current through an external R
SET
resistor.
The device supplies up to 80mA of total load current to
accommodate any combination of up to three white LEDs,
and additional current from V
OUT
. The switching frequency is
set at 500kHz. (typ.) to keep the conducted noise spectrum
away from sensitive frequencies within portable RF devices.
By applying a pulse width modulated (PWM) signal to the
PWM pin, the user has the ability to independently control
the brightness of the regulated current source outputs with-
out shutting down the regulated output voltage.
Features
n
2.7V to 5.5V Input Voltage
n
Regulated Output Voltage (V
OUT
= 4.35V)
n
Regulated I
Dx
with
鹵
0.3% matching between constant
current outputs
n
High Efficiency 3/2 Boost function
n
Drives one, two, or three white LEDs with no bias
resistor losses
n
Drives auxiliary keypad LEDS in voltage mode
n
Up to 80mA total output current
n
Active-High Enable
n
Active-High PWM Control Pin for independent control of
current sources
n
Very small solution size
n
1碌A(chǔ)(max) shutdown current
n
500kHz switching frequency (typ.)
n
Linear regulation generates predictable noise spectrum
n
LLP-14 package: 4.0mm X 3.0mm X 0.8mm
Applications
n
Portable devices using white or blue LEDs with display
and backlight or frontlight
n
1-Cell LiIon battery-operated equipment including PDAs,
hand-held PCs and cellular phones
Typical Application Circuit
20085021
漏 2004 National Semiconductor Corporation
DS200850
www.national.com

LM3570相關(guān)型號(hào)PDF文件下載

您可能感興趣的PDF文件資料

熱門IC型號(hào)推薦

掃碼下載APP，
一鍵連接廣大的電子世界。

在線人工客服

買家服務(wù)：
賣家服務(wù)：
技術(shù)客服：

0571-85317607

網(wǎng)站技術(shù)支持

13606545031

客服在線時(shí)間周一至周五
9:00-17:30

關(guān)注官方微信號(hào)，
第一時(shí)間獲取資訊。

建議反饋
返回頂部

建議反饋

聯(lián)系人：

聯(lián)系方式：

按住滑塊，拖拽到最右邊
>>
感謝您向阿庫提出的寶貴意見，您的參與是維庫提升服務(wù)的動(dòng)力！意見一經(jīng)采納，將有感恩紅包奉上哦！