LP8553
- High-Voltage DC/DC Boost Converter with Integrated FET
with Four Switching Frequency Options: 156/312/625/1250 kHz - 2.7V to 22V Input Voltage Range to Support 1x…5x Cell
Li-Ion Batteries - Programmable PWM Resolution
- 8 to 13 True Bit (Steady State)
- Additional 1 to 3 Bits Using Dithering During Brightness
Changes
- I2C and PWM Brightness Control
- Automatic PWM & Current Dimming for Improved
Efficiency - PWM Output Frequency and LED Current Set Through
Resistors - Optional Synchronization to Display VSYNC
Signal - 4 LED Outputs with LED Fault (Short/Open) Detection
- Low Input Voltage, Over-Temperature, Over-Current Detection
and Shutdown - Minimum Number of External Components
- DSBGA 25-Bump Package, 2.466 × 2.466 × 0.6 mm
The LP8553 is a white LED driver with integrated boost converter. It has four adjustable current sinks which can be controlled by PWM input or with I2C-compatible serial interface.
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.
LED outputs have 8-bit current resolution and up to 13-bit PWM resolution with additional 1-3 bit dithering to achieve smooth and precise brightness control. Proprietary Phase Shift PWM control is used for LED outputs to reduce peak current from the boost converter, thus making the boost capacitors smaller. The Phase Shifting scheme also eliminates audible noise.
Automatic PWM dimming at lower brightness values and current dimming at higher brightness values can be used to improve the optical efficiency.
Internal EEPROM is used for storing the configuration data. This makes it possible to have minimum external component count and make the solution very small.
LP8553 has safety features which make it possible to detect LED outputs with open or short fault. Low input voltage and boost over-current conditions are also monitored, and the chip is turned off when these events occur. Thermal de-rating function prevents overheating of the device by reducing backlight brightness when set temperature has been reached.
LP8553 is available in TI’s DSBGA 25-bump package.
기술 자료
| 유형 | 직함 | 날짜 | ||
|---|---|---|---|---|
| * | Data sheet | LP8553 High-Efficiency LED Backlight Driver for Notebooks datasheet (Rev. B) | 2014/01/03 | |
| White paper | Common LED Functions and LED Driver Design Considerations | 2020/09/21 | ||
| Application note | Some Guidelines and Tips for the LED Driver Application | 2019/08/14 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 2018/06/25 |
설계 및 개발
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LP8550SW-LINUX — LP8550용 Linux 드라이버
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 설계 및 시뮬레이션 툴용 PSpice®
TI 설계 및 시뮬레이션 환경용 PSpice는 기본 제공 라이브러리를 이용해 복잡한 혼합 신호 설계를 시뮬레이션할 수 있습니다. 레이아웃 및 제작에 (...)
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| DSBGA (YZR) | 25 | Ultra Librarian |
주문 및 품질
- RoHS
- REACH
- 디바이스 마킹
- 납 마감/볼 재질
- MSL 등급/피크 리플로우
- MTBF/FIT 예측
- 물질 성분
- 인증 요약
- 지속적인 신뢰성 모니터링
- 팹 위치
- 조립 위치