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參數資料
| 型號： | LP5521 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Programmable Three Channel LED Driver |
| 中文描述： | 可編程三通道LED驅動器 |
| 文件頁數： | 1/14頁 |
| 文件大?。?/td> | 247K |
| 代理商： | LP5521 |
June 2007
LP5521
Programmable Three Channel LED Driver
General Description
The LP5521 is a three channel LED driver designed to pro-
duce variety of lighting effects for mobile devices. High effi-
ciency charge pump enables LED driving over full Li-Ion
battery voltage range. The device has a program memory for
creating variety of lighting sequences. When program mem-
ory has been loaded, LP5521 can operate independently
without processor control.
LP5521 maintains excellent efficiency over a wide operating
range by automatically selecting proper charge pump gain
based on LED forward voltage requirements. LP5521 is able
to automatically enter power-save mode, when LED outputs
are not active and thus lowering current consumption.
Three independent LED channels have accurate pro-
grammable current sources and PWM control. Each channel
has program memory for creating desired lighting sequences
with PWM control.
LP5521 has a flexible digital interface. Trigger I/O and 32 kHz
clock input allow synchronization between multiple devices.
Interrupt output can be used to notify processor, when LED
sequence has ended. LP5521 has four pin selectable I
2
C ad-
dresses. This allows connecting up to four parallel devices in
one I
2
C bus. GPO and INT pins can be used as a digital con-
trol pin for other devices.
LP5521 requires only four small and low cost ceramic capac-
itors.
LP5521 is available in tiny 2.1x1.7x0.6 mm microSMD-20
package and in 4.0x5.0x0.8 mm bumped LLP-24 package.
Comprehensive application tools are available, including
command compiler for easy LED sequence programming.
Features
■
Adaptive charge pump with 1x and 1.5x gain provides up
to 95% LED drive efficiency
■
Charge pump with soft start and overcurrent/short circuit
protection
■
Low input ripple and EMI
■
Very small solution size, no inductor or resistors required
■
200 nA typical shutdown current
■
Automatic power save mode
■
I
2
C compatible interface
■
Independently programmable constant current outputs
with 8-bit current setting and 8-bit PWM control
■
Typical LED output saturation voltage 50 mV and current
matching 1%
■
Three program execution engines with flexible instruction
set
■
Autonomous operation without external control
■
Large SRAM program memory
■
Two general purpose digital outputs
■
microSMD-20 package, 0.4 mm pitch
■
Bumped LLP-24 package, 0.5 mm pitch
Applications
■
Fun / indicator lights
■
LCD sub-display backlighting
■
Keypad RGB backlighting and phone cosmetics
■
Vibra, speakers, waveform generator
Typical Application
20186270
2007 National Semiconductor Corporation
201862
www.national.com
L
相關PDF資料 |
PDF描述 |
|---|---|
| LP5521TM | Programmable Three Channel LED Driver |
| LP5521TMX | Programmable Three Channel LED Driver |
| LP5521YQ | Programmable Three Channel LED Driver |
| LP5521YQX | Programmable Three Channel LED Driver |
| LP5522 | Programmable LED Driver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LP5521TM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Programmable Three Channel LED Driver |
| LP5521TM/NOPB | 功能描述:LED照明驅動器 3 Ch Prog Led Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| LP5521TMEV | 功能描述:電源管理IC開發工具 LP5521TMEV EVAL BOARD RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LP5521TMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Programmable Three Channel LED Driver |
| LP5521TMX/NOPB | 功能描述:LED照明驅動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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