LP8543
- High-Voltage DC/DC Boost Converter with Integrated FET
- 5.5V to 22V Input Voltage Range to Support 2x, 3x and 4x Li-Ion Batteries.
- PWM Phase Shift Control with Adaptive Boost Output to Increase Efficiency Compared to Conventional Boost Converters Topologies
- PWM Brightness Control for Single Wire Control and Stand-Alone Use
- Digital Ambient Light Sensor Interface with User-Programmed Ambient Light to Backlight Brightness Curve
- Easy-to-Use EEPROM Calibration for Current, Intensity and Ambient Light Response Setting
- Seven LED Drivers with LED Fault (Short/open) Detection
- Eight-Bit LED Current Control
- Internal Thermal Protection and Backlight Safety Dimming Feature
- Two Wire, SMBus/ I2C-Compatible Control Interface
- Low-Input Voltage Detection and Shutdown
- Minimum Number of External Components
- WQFN 24-Pin Package, 4 x 4 x 0.8 mm
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The LP8543 is a white LED driver with integrated boost converter. It has 7 adjustable current sinks which can be controlled by SMBus or I2C-compatible serial interface, PWM input and Ambient Light Sensor (ALS).
The boost converter has adaptive output voltage control based on the LED driver voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions. Phase Shift PWM dimming offers further power saving especially when there is poor matching in the forward voltages of the LED strings. Boost voltage can also be controlled through the SMBus/I2C.
Internal EEPROM stores the data for backlight brightness and ambient light sensor calibration. Brightness can be calibrated during the backlight unit production so that all units produce the same brightness. EEPROM also stores the coefficients for the LED control equations and the default LED current value. LED current has 8–bit adjustment from 0 to 60 mA.
The LP8543 has several safety and diagnostic features. Low-input voltage detection turns the chip off if the system gets stuck and battery fully discharges. Input voltage detection threshold is adjustable for different battery configurations. Thermal regulation reduces backlight brightness above a set temperature. LED fault detection reports open or LED short fault. Boost over-current fault detection protects the chip in case of over-current event.
LP8543 is available in the WQFN 24-pin package.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LP8543 SMBus/I2C Controlled WLED Driver for Medium-Sized LCD Backlight datasheet (Rev. D) | 2013年 3月 12日 | |
| White paper | Common LED Functions and LED Driver Design Considerations | 2020年 9月 21日 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 2018年 6月 25日 |
設計與開發
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PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WQFN (RTW) | 24 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。