전원 관리 LED 드라이버 백라이트 LED 드라이버

LP8545

활성

유연한 외부/내부 FET 제어를 지원하는 노트북용 6채널 고효율 LED 백라이트 드라이버

제품 상세 정보

Number of channels 6 Vin (min) (V) 5.5 Vin (max) (V) 22 Vout (min) (V) 0 Vout (max) (V) 55 Type Inductive Switching frequency (max) (kHz) 1250 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 91 Topology Boost Features Adjustable Switch Frequency, Enable/Shutdown, I2C control, PWM control Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 6 Vin (min) (V) 5.5 Vin (max) (V) 22 Vout (min) (V) 0 Vout (max) (V) 55 Type Inductive Switching frequency (max) (kHz) 1250 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 91 Topology Boost Features Adjustable Switch Frequency, Enable/Shutdown, I2C control, PWM control Operating temperature range (°C) -30 to 85 Rating Catalog
WQFN (RTW) 24 16 mm² 4 x 4
  • High-Voltage DC/DC Boost Converter with Integrated FET
    with Four Switching Frequency Options: 156/312/625/1250 kHz
  • Configurable for Use with External FET for Applications Needing
    Higher Output Voltage
  • 2.7V – 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
  • PWM Output Frequency and LED Current Set Through Resistors
  • Optional Synchronization to Display VSYNC Signal
  • 6 LED Outputs with LED fault (Short/Open) Detection
  • Low Input Voltage, Over-Temperature, Over-Current Detection
    and Shutdown
  • Minimum Number of External Components
  • WQFN 24-Pin Package, 4 × 4 × 0.8 mm
  • High-Voltage DC/DC Boost Converter with Integrated FET
    with Four Switching Frequency Options: 156/312/625/1250 kHz
  • Configurable for Use with External FET for Applications Needing
    Higher Output Voltage
  • 2.7V – 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
  • PWM Output Frequency and LED Current Set Through Resistors
  • Optional Synchronization to Display VSYNC Signal
  • 6 LED Outputs with LED fault (Short/Open) Detection
  • Low Input Voltage, Over-Temperature, Over-Current Detection
    and Shutdown
  • Minimum Number of External Components
  • WQFN 24-Pin Package, 4 × 4 × 0.8 mm

The LP8545 is a white LED driver with integrated boost converter. It has six 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.

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.

LP8545 has safety features which make it possible to detect LED outputs with open or short fault. As well low input voltage and boost over-current conditions are monitored and chip is turned off in case of these events. Thermal de-rating function prevents overheating of the device by reducing backlight brightness when set temperature has been reached.

LP8545 is available in TI’s WQFN 24-pin package.

The LP8545 is a white LED driver with integrated boost converter. It has six 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.

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.

LP8545 has safety features which make it possible to detect LED outputs with open or short fault. As well low input voltage and boost over-current conditions are monitored and chip is turned off in case of these events. Thermal de-rating function prevents overheating of the device by reducing backlight brightness when set temperature has been reached.

LP8545 is available in TI’s WQFN 24-pin package.

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기술 자료

star =TI에서 선정한 이 제품의 인기 문서
검색된 결과가 없습니다. 검색어를 지우고 다시 시도하십시오.
3개 모두 보기
유형 직함 날짜
* Data sheet LP8545 High-Efficiency LED Backlight Driver for Notebooks datasheet (Rev. D) 2014/01/03
White paper Common LED Functions and LED Driver Design Considerations 2020/09/21
Selection guide Power Management Guide 2018 (Rev. R) 2018/06/25

설계 및 개발

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WQFN (RTW) 24 Ultra Librarian

주문 및 품질

포함된 정보:
  • RoHS
  • REACH
  • 디바이스 마킹
  • 납 마감/볼 재질
  • MSL 등급/피크 리플로우
  • MTBF/FIT 예측
  • 물질 성분
  • 인증 요약
  • 지속적인 신뢰성 모니터링
포함된 정보:
  • 팹 위치
  • 조립 위치

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