LP8501 [NSC]
Multi-Purpose 9-Output LED Driver; 多用途9路输出LED驱动器
| 型号： | LP8501 |
| 厂家： | 
National Semiconductor |
| 描述： | Multi-Purpose 9-Output LED Driver |
| 文件： | 总2页 (文件大小：120K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
November 20, 2008
LP8501 PRODUCT BRIEF
Multi-Purpose 9-Output LED Driver
General Description
Features
The LP8501 is a LED driver with 9 outputs, designed to pro-
duce versatile lighting effects for mobile devices. The device
is equipped with an internal program memory, which allows
operation without processor control. Internal program mem-
ory is used by three independent program execution engines
to produce user defined lighting effects for the outputs.
Three independent program execution engines for user
defined programs with large SRAM memory for storing
lighting programs
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9 programmable source (high side) driver outputs with
25.5 mA full-scale current, 8-bit current setting resolution
and 12-bit PWM control resolution
Flexible grouping possibility for all 9 outputs including
GPO into three groups with group PWM and Fade in/ Fade
out controls
A high-efficiency charge pump enables LED driving over full
Li-Ion battery voltage range. The excellent efficiency over a
wide operating range is achieved by autonomously selecting
the best charge pump gain based on LED forward voltage
requirements. LP8501 is able to automatically enter power-
save mode when LED outputs are not active, thus lowering
idle current consumption down to 10 µA (typ.)
Built-in LED test
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Adaptive charge pump with 1x and 1.5x gain provides up
to 95% LED drive efficiency and with soft start and
overcurrent/short circuit protection
The device has a flexible General Purpose Output (GPO),
which can be used for example as a digital control pin for other
devices. INT pin (interrupt function), which can be used to
notify processor. Trigger input interface, which allows pro-
gram execution start without I2C write.
Automatic power save mode; IVDD = 10 µA (typ.)
Two wire, I2C-compatible, control interface
Small application circuit
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Pin-configured LED powering for LEDs 1 to 6 and for LEDs
7 to 9
Solution area <18 mm2
The device requires only four small and low-cost ceramic ca-
pacitors. The LP8501 is available in a tiny 25–bump 2.27 mm
x 2.27 mm x 0.60 mm micro SMD package (0.4 mm pitch).
■
Applications
Notice: This document is not a full datasheet. For more
information regarding this product or to order samples,
please contact your local National Semiconductor sales
office or visit http://www.national.com/support/dir.html
Fun lights and indicator lights
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LED backlighting and color keypad lighting
Programmable current source
Haptic feedback driver and GPIO expander
■
Typical Application
30041901
© 2008 National Semiconductor Corporation
300419
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