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 | LM3538 6-Channel WLED Driver with Four Integrated LDOs データシート (Rev. A) | 2013年 5月 3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 | |||
| セレクション・ガイド | 電源 IC セレクション・ガイド 2018 (Rev. R 翻訳版) | 英語版 (Rev.R) | 2018年 9月 13日 |
設計と開発
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| パッケージ | ピン数 | ダウンロード |
|---|---|---|
| DSBGA (YFQ) | 30 | オプションの表示 |
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
- 材質成分
- 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