首頁 電源管理 LED 驅動器 背光 LED 驅動器

LM27964

現行

具 I2C 相容亮度控制的白光 LED 驅動器系統

產品詳細資料

Number of channels 7 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) 900 Duty cycle (max) (%) 100 LED current per channel (mA) 30 Peak efficiency (%) 87 Topology Boost Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 7 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) 900 Duty cycle (max) (%) 100 LED current per channel (mA) 30 Peak efficiency (%) 87 Topology Boost Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
WQFN (RTW) 24 16 mm² 4 x 4
  • 87% Peak LED Drive Efficiency
  • 0.2% Current Matching between Current Sinks
  • Drives 6 LEDs with up to 30mA per LED in Two Distinct Groups, for Backlighting Two Displays (main LCD and sub LCD)
  • Dedicated Keypad LED Driver with up to 80mA of Drive Current
  • Independent Resistor-Programmable Current Settings
  • I2C Compatible Brightness Control Interface
  • Adaptive 1×- 3/2× Charge Pump
  • Extended Li-Ion Input: 2.7V to 5.5V
  • Small Low Profile Industry Standard Leadless Package, WQFN-24 : (4mm x 4mm x 0.8mm)
  • LM27964SQ-I LED PWM Frequency = 10kHz, LM27964SQ-C LED PWM frequency = 23kHz

All trademarks are the property of their respective owners.

  • 87% Peak LED Drive Efficiency
  • 0.2% Current Matching between Current Sinks
  • Drives 6 LEDs with up to 30mA per LED in Two Distinct Groups, for Backlighting Two Displays (main LCD and sub LCD)
  • Dedicated Keypad LED Driver with up to 80mA of Drive Current
  • Independent Resistor-Programmable Current Settings
  • I2C Compatible Brightness Control Interface
  • Adaptive 1×- 3/2× Charge Pump
  • Extended Li-Ion Input: 2.7V to 5.5V
  • Small Low Profile Industry Standard Leadless Package, WQFN-24 : (4mm x 4mm x 0.8mm)
  • LM27964SQ-I LED PWM Frequency = 10kHz, LM27964SQ-C LED PWM frequency = 23kHz

All trademarks are the property of their respective owners.

The LM27964 is a charge-pump-based white-LED driver that is ideal for mobile phone display backlighting. The LM27964 can drive up to 6 LEDs in parallel along with multiple keypad LEDs, with a total output current up to 180mA. Regulated internal current sources deliver excellent current matching in all LEDs.

The LED driver current sources are split into two independently controlled groups. The primary group (4 LEDs) can be used to backlight the main phone display and the second group (2 LEDs) can be used to backlight a secondary display. A single Keypad LED driver can power up to 16 keypad LEDs with a current of 5mA each. The LM27964 has an I2C compatible interface that allows the user to independently control the brightness on each bank of LEDs.

The LM27964 works off an extended Li-Ion input voltage range (2.7V to 5.5V). 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 LM27964 is available in TI's small 24-pin WQFN Package (WQFN-24).

The LM27964 is a charge-pump-based white-LED driver that is ideal for mobile phone display backlighting. The LM27964 can drive up to 6 LEDs in parallel along with multiple keypad LEDs, with a total output current up to 180mA. Regulated internal current sources deliver excellent current matching in all LEDs.

The LED driver current sources are split into two independently controlled groups. The primary group (4 LEDs) can be used to backlight the main phone display and the second group (2 LEDs) can be used to backlight a secondary display. A single Keypad LED driver can power up to 16 keypad LEDs with a current of 5mA each. The LM27964 has an I2C compatible interface that allows the user to independently control the brightness on each bank of LEDs.

The LM27964 works off an extended Li-Ion input voltage range (2.7V to 5.5V). 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 LM27964 is available in TI's small 24-pin WQFN Package (WQFN-24).

下載 觀看有字幕稿的影片 影片

技術文件

star =TI 所選的此產品重要文件
找不到結果。請清除您的搜尋條件,然後再試一次。
檢視所有 2
類型 標題 日期
* Data sheet LM27964 White LED Driver System with I2C Compatible Brightness Control datasheet (Rev. D) 2013年 5月 2日
White paper Common LED Functions and LED Driver Design Considerations 2020年 9月 21日

設計與開發

如需其他條款或必要資源,請按一下下方的任何標題以檢視詳細頁面 (如有)。

模擬工具

PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
封裝 針腳 CAD 符號、佔位空間與 3D 模型
WQFN (RTW) 24 Ultra Librarian

訂購與品質

內含資訊:
  • RoHS
  • REACH
  • 產品標記
  • 鉛塗層/球物料
  • MSL 等級/回焊峰值
  • MTBF/FIT 估算值
  • 材料內容
  • 認證摘要
  • 進行中持續性的可靠性監測
內含資訊:
  • 晶圓廠位置
  • 組裝地點

支援與培訓

內含 TI 工程師技術支援的 TI E2E™ 論壇

內容係由 TI 和社群貢獻者依「現狀」提供,且不構成 TI 規範。檢視使用條款

若有關於品質、封裝或訂購 TI 產品的問題,請參閱 TI 支援。​​​​​​​​​​​​​​

影片