• - 交流-直流(AC-DC)控制器和稳压器
• - 直流-直流(DC-DC)控制器、转换器和稳压器
• - 电压和电流管理
• - 通讯IC
• - 驱动器
• - 热管理

• - 时钟及数据分配
• - 标准逻辑

• - 放大器和比较器
• - 模拟开关
• - 数字电位计
• - 接口
• - EMI和RFI滤波器

• - EEPROM存储器
• - 非易失性只读存储器(NVRAM)
• - SRAM存储器

说明

The TPS7510x linear low dropout (LDO) matching LED current source is optimized for low power keypad and navigation pad LED backlighting applications. The device provides a constant current to up to four unmatched LEDs organized in two banks of two LEDs each in a common-cathode topology. Without an external resistor, the current source defaults to factory-programmable, preset current level with ±0.5% accuracy (typical). An optional external resistor can be used to set initial brightness to user-programmable values with higher accuracy. Brightness can be varied from off to full brightness by inputting a pulse width modulation (PWM) signal on each Enable pin. Each bank has independent enable and brightness control, but current matching is done to all four channels concurrently.

特性

• Regulated Output Current with 2% LED-to-LED Matching
• Drives Up to Four LEDs at 25mA Each in a Common Cathode Topology
• 28mV Typical Dropout Voltage Extends Usable Supply Range in Li-Ion Battery Applications
• Brightness Control Using PWM Signals
• Two 2-LED Banks with Independent Enable and PWM Brightness Control per Bank
• No Internal Switching Signals—Eliminates EMI
• Default LED Current Eliminates External Components
  • Default values from 3mA to 10mA (in 1mA increments) available using innovative factory EEPROM programming
  • Optional external resistor can be used for high-accuracy, user-programmable current
• Over-Current and Over-Temperature Protection
• Available in Wafer Chip-Scale Package or 2,5mm × 2,5mm SON-10
• APPLICATIONS
  • Keypad and Display Backlighting
  • White and Color LEDs
  • Cellular Handsets
  • PDAs and Smartphones