LP8557
- High-Efficiency DC-DC Boost Converter With 28-V Integrated Power MOSFET
- 2.7-V to 5.5-V VDD Range for Supporting Single-Cell Li-Ion Battery Applications
- Six 25-mA High-Precision LED Current Sinks
- Adaptive Boost Voltage and LED Current Sink Headroom Controls for Maximum System Efficiency
- LED String Count Auto-Detect for Maximum Design Flexibility
- Smart Phase Shift PWM Mode for Reduced Audible Noise
- PWM Input Duty Cycle Brightness Control, PWM Output Frequency Selectable Independent of Input Frequency
- Hybrid PWM Plus Current Dimming for Higher LED Drive Optical Efficiency
- Switching Frequency, PWM Output Frequency, and LED Current can be set Through Resistors or I2C Interface
- Programmable Boost SW Slew Rate Control and Spread Spectrum Scheme for Reduced Switching Noise and Improved EMI Performance
- UVLO, TSD, BST_OVP, BST_OCP, BST_UV, LED OPEN* and LED Short Fault Coverage
- Minimum Number of External Components
The LP8557 and LP8557I are high-efficiency LED drivers each featuring an integrated DC-DC inductive boost converter and six high-precision current sinks. LP8557 is intended for applications that exclusively use a pulse width modulated (PWM) signal for controlling the brightness while LP8557I is intended for applications that can utilize an I2C master as well.
The boost converter has adaptive output voltage control. This feature minimizes the power consumption by adjusting the voltage to the lowest sufficient level under all conditions.
The adaptive current sink headroom voltage control scales the headroom voltage with the LED current for optimal system efficiency.
The LED string auto-detect function enables use of the same device in systems with 1 to 6 LED strings for the maximum design flexibility.
Proprietary hybrid PWM plus current mode dimming enables additional system power savings. Phase-shift PWM allows reduced audible noise and smaller boost output capacitors.
Flexible CABC support combines brightness level selections based on the PWM input and I2C commands.
For all available packages, see the orderable addendum at the end of the data sheet.技術資料
種類 | タイトル | 最新の英語版をダウンロード | 日付 | |||
---|---|---|---|---|---|---|
* | データシート | LP8557 High-Efficiency LED Backlight Driver For Tablets データシート (Rev. B) | PDF | HTML | 2015年 12月 18日 | ||
ホワイト・ペーパー | Common LED Functions and LED Driver Design Considerations.. | 英語版 | 2020年 9月 21日 | |||
アプリケーション・ノート | Some Guidelines and Tips for the LED Driver Application | 2019年 8月 14日 | ||||
アプリケーション・ノート | Inductor Selection in Boost Converters for LCD Backlight Applications | 2016年 10月 24日 | ||||
アプリケーション・ノート | Schottky Diode Selection in Asynchronous Boost Converters | 2016年 9月 6日 | ||||
ユーザー・ガイド | LP8557 Evaluation Module | 2013年 12月 17日 |
設計および開発
その他のアイテムや必要なリソースを参照するには、以下のタイトルをクリックして詳細ページをご覧ください。
LP8557EVM — LP8557 6 チャネル高効率 LCD バックライト・ドライバ用評価モジュール
LP8557 6-channel high efficiency LCD backlight driver evaluation kit. The LP8557 evaluation kit only requires a power source and a PWM source. When powered on, the LED brightness is controlled by the pulse width of the PWM signal.
LP8557IEVM — LP8557 評価モジュール、高効率白色 LED バックライト・ドライバ、I2C コントロール付き
LP8557IEVM is a 6-channel high efficiency LCD backlight driver evaluation kit that includes an I2C compatible program and USB2ANY adapter board with mini USB cable that exercises the part in a simple way. The status of the device is monitored by the evaluation software and the various (...)
LP8550SW-LINUX — LP8550 向け Linux ドライバ
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
Supported Devices:
- lp8550
- lp8551
- lp8552
- (...)
PSPICE-FOR-TI — TI Design / シミュレーション・ツール向け PSpice®
設計とシミュレーション向けの環境である PSpice for TI (...)
パッケージ | ピン数 | CAD シンボル、フットプリント、および 3D モデル |
---|---|---|
DSBGA (YFQ) | 16 | Ultra Librarian |
購入と品質
- RoHS
- REACH
- デバイスのマーキング
- リード端子の仕上げ / ボールの原材料
- MSL 定格 / ピーク リフロー
- MTBF/FIT 推定値
- 使用原材料
- 認定試験結果
- 継続的な信頼性モニタ試験結果
- ファブの拠点
- 組み立てを実施した拠点