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LM27952

現行

具 3V-5.5V 輸入電壓範圍的白光 LED 自適應 1.5X/1X 切換式電容器電流驅動器

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產品規格表

LM27952

現行
產品規格表 立即訂購

產品詳細資料

Number of channels 4 Vin (min) (V) 3 Vin (max) (V) 5.5 Vout (min) (V) 3 Vout (max) (V) 5.5 Type Capacitive Switching frequency (max) (kHz) 975 Duty cycle (max) (%) 100 LED current per channel (mA) 30 Peak efficiency (%) 85 Topology Boost Features Direct PWM Dimming Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 4 Vin (min) (V) 3 Vin (max) (V) 5.5 Vout (min) (V) 3 Vout (max) (V) 5.5 Type Capacitive Switching frequency (max) (kHz) 975 Duty cycle (max) (%) 100 LED current per channel (mA) 30 Peak efficiency (%) 85 Topology Boost Features Direct PWM Dimming Operating temperature range (°C) -40 to 85 Rating Catalog
WSON (NHK) 14 12 mm² 4 x 3
  • Drives up to 4 LEDs with up to 30mA each
  • Regulated current sources with 0.2%(typ.) matching
  • 3/2x, 1x Gain transition based on LED VF
  • Peak Efficiency Over 85%
  • Input Voltage Range: 3.0V to 5.5V
  • PWM Brightness Control
  • Very Small Solution Size - NO INDUCTOR
  • Fixed 750kHz Switching Frequency
  • <1µA Shutdown Current
  • 14-pin WSON Package: 4.0mm X 3.0mm X 0.8mm

All trademarks are the property of their respective owners.

  • Drives up to 4 LEDs with up to 30mA each
  • Regulated current sources with 0.2%(typ.) matching
  • 3/2x, 1x Gain transition based on LED VF
  • Peak Efficiency Over 85%
  • Input Voltage Range: 3.0V to 5.5V
  • PWM Brightness Control
  • Very Small Solution Size - NO INDUCTOR
  • Fixed 750kHz Switching Frequency
  • <1µA Shutdown Current
  • 14-pin WSON Package: 4.0mm X 3.0mm X 0.8mm

All trademarks are the property of their respective owners.

The LM27952 is a switched capacitor white-LED driver capable of driving up to 4 LEDs with 30mA through each LED. Its 4 tightly regulated current sinks ensure excellent LED current and brightness matching. LED drive current is programmed by an external sense resistor. The LM27952 operates over an input voltage range from 3.0V to 5.5V and requires only four low-cost ceramic capacitors.

The LM27952 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2, or in a gain of 1. Maximum efficiency is achieved over the input voltage range by actively selecting the proper gain based on the LED forward voltage requirements.

The LM27952 uses constant frequency pre-regulation to minimize conducted noise on the input. It has a fixed 750kHz switching frequency optimized for portable applications. The LM27952 consumes less than 1µA of supply current when shut down.

The LM27952 is available in a 14-pin No-Pullback Leadless Leadframe Package: WSON-14.

The LM27952 is a switched capacitor white-LED driver capable of driving up to 4 LEDs with 30mA through each LED. Its 4 tightly regulated current sinks ensure excellent LED current and brightness matching. LED drive current is programmed by an external sense resistor. The LM27952 operates over an input voltage range from 3.0V to 5.5V and requires only four low-cost ceramic capacitors.

The LM27952 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2, or in a gain of 1. Maximum efficiency is achieved over the input voltage range by actively selecting the proper gain based on the LED forward voltage requirements.

The LM27952 uses constant frequency pre-regulation to minimize conducted noise on the input. It has a fixed 750kHz switching frequency optimized for portable applications. The LM27952 consumes less than 1µA of supply current when shut down.

The LM27952 is available in a 14-pin No-Pullback Leadless Leadframe Package: WSON-14.

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類型 標題 日期
* Data sheet LM27952 White LED Adaptive 1.5X/1X Switched Capacitor Current Driver datasheet (Rev. B) 2013年 5月 2日
White paper Common LED Functions and LED Driver Design Considerations 2020年 9月 21日
Application note Optimizing Efficiency in White LED Backlight Applications 2007年 3月 21日

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