LM3538
- 6-channel Backlight Capability
- Internal ALS Engine; PWM Input to Support CABC
- Built-in Power Supply and Gain Control for Ambient Light Sensor
- Up to 90% Efficiency
- Adaptive Charge Pump with 1x and 1.5x Gains for Maximum Efficiency
- 128 Dimming Steps for Group A, Exponential or Linear Dimming Selectable by Register Setup
- 8 Linear Dimming States for Group B
- 4 Programmable LDOs (300mA/150mA Output Currents)
- Default Startup Voltage States
- Low Dropout Voltage: 100mV typ. at 150mA Load Current
- LDO Input Voltage = 1.8V to VIN_A
- Overload Protection
- Wide Input Voltage Range: 2.7V to 5.5V
- I2C-compatible Serial Interface
- 2 General-purpose Outputs
Lighting:
LDOs:
Combined Common Features:
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The LM3538 is a highly integrated LED driver capable of driving 6 LEDs in parallel for single display backlighting applications. Independent LED control allows for a subset of the main display LEDs to be selected for partial illumination applications.
I2C-compatible control allows full configurability of the backlighting function. The LM3538 provides multi-zone Ambient Light Sensing allowing autonomous backlight intensity control in the event of changing ambient light conditions. A PWM input is also provided to give the user a means to adjust the backlight intensity dynamically based upon the content of the display.
Four integrated LDOs are fully configurable through I2C capable of addressing point-of-load regulation needs for functions such as integrated camera modules. The LDOs can be powered from main battery source, or by a fixed output voltage of an external buck converter (post regulation) leading to higher conversion efficiency.
The LM3538 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2 or in Pass-Mode. The proper gain for maintaining current regulation is chosen, based on LED forward voltage, so that efficiency is maximized over the input voltage range
LM3538 is offered in a tiny 30-bump DSBGA package.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM3538 6-Channel WLED Driver with Four Integrated LDOs datasheet (Rev. A) | 2013年 5月 3日 | |
| White paper | Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) | PDF | HTML | 2024年 4月 30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 | 引腳 | 下載 |
|---|---|---|
| DSBGA (YFQ) | 30 | 檢視選項 |
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
- 資格摘要
- 進行中可靠性監測
- 晶圓廠位置
- 組裝地點