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LM27965

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Dual-Display-Weiß-LED-Treiber mit I2C-kompatibler Helligkeitsregelung

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LM27965

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Produktdetails

Number of channels 8 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 2.7 Vout (max) (V) 5.5 Type Capacitive Switching frequency (max) (kHz) 1570 Duty cycle (max) (%) 100 LED current per channel (mA) 30 Peak efficiency (%) 91 Topology Buck Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 8 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 2.7 Vout (max) (V) 5.5 Type Capacitive Switching frequency (max) (kHz) 1570 Duty cycle (max) (%) 100 LED current per channel (mA) 30 Peak efficiency (%) 91 Topology Buck Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
WQFN (RTW) 24 16 mm² (4 mm × 4 mm)
  • 91% Peak LED Drive Efficiency
  • No Inductor Required
  • 0.3% Current Matching
  • Drives LEDs with up to 30mA per LED
  • 180mA of total drive current
  • I2C Compatible Brightness Control Interface
  • Adaptive 1× - 3/2× Charge Pump
  • Resistor-Programmable Current Settings
  • External Chip RESET Pin
  • Extended Li-Ion Input: 2.7V to 5.5V
  • Small low profile industry standard leadless package, WQFN 24 : (4mm x 4mm x 0.8mm)
  • 25mm2 total solution size
  • Two I2C Compatible Chip Address Options: 0x36 for LM27965SQ and 0x38 for
    LM27965SQ-M
  • 91% Peak LED Drive Efficiency
  • No Inductor Required
  • 0.3% Current Matching
  • Drives LEDs with up to 30mA per LED
  • 180mA of total drive current
  • I2C Compatible Brightness Control Interface
  • Adaptive 1× - 3/2× Charge Pump
  • Resistor-Programmable Current Settings
  • External Chip RESET Pin
  • Extended Li-Ion Input: 2.7V to 5.5V
  • Small low profile industry standard leadless package, WQFN 24 : (4mm x 4mm x 0.8mm)
  • 25mm2 total solution size
  • Two I2C Compatible Chip Address Options: 0x36 for LM27965SQ and 0x38 for
    LM27965SQ-M

The LM27965 is a highly integrated charge-pump-based dual-display LED driver. The device can drive up to 9 LEDs in parallel with a total output current of 180mA. Regulated internal current sinks deliver excellent current and brightness matching in all LEDs.

The LED driver current sinks are split into three independently controlled groups. The primary group can beconfigurabled with 4 or 5 LEDs, for backlighting a larger main display and the second group can be configured with 2 or 3 LEDs, for backlighing a smaller secondary display. An additional, independently controlled led driver is provided for driving an indicator or general purpose LED. The LM27965 has an I2C compatible interface that allows the user to independently control the brightness on each bank of LEDs.

The device 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.

The LM27965 is available in a small 24-pin WQFN-24 package.

The LM27965 is a highly integrated charge-pump-based dual-display LED driver. The device can drive up to 9 LEDs in parallel with a total output current of 180mA. Regulated internal current sinks deliver excellent current and brightness matching in all LEDs.

The LED driver current sinks are split into three independently controlled groups. The primary group can beconfigurabled with 4 or 5 LEDs, for backlighting a larger main display and the second group can be configured with 2 or 3 LEDs, for backlighing a smaller secondary display. An additional, independently controlled led driver is provided for driving an indicator or general purpose LED. The LM27965 has an I2C compatible interface that allows the user to independently control the brightness on each bank of LEDs.

The device 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.

The LM27965 is available in a small 24-pin WQFN-24 package.
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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt LM27965 Dual Display White LED Driver with I2C Compatible Brightness Control datasheet (Rev. B) 20.02.2013
Whitepaper Common LED Functions and LED Driver Design Considerations 21.09.2020
Anwendungshinweis LM27965 Dual Display White LED Driver w/I2C Compatible Brightness Control (Rev. B) 30.04.2013
Anwendungshinweis Optimizing Efficiency in White LED Backlight Applications 21.03.2007

Design und Entwicklung

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Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
WQFN (RTW) 24 Ultra Librarian
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