TPS75105 - Texas Instruments

TPS75105 Two-Bank LED Driver

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 a factory-p.

Features

•1 Regulated Output Current with 2% LED-to-LED Matching
• Drives Up to Four LEDs at 25 mA Each in a Common Cathode Topology
• 28-mV 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 3 mA to 10 mA (in 1-mA Increments) Available Using Innovative Factory EEPROM Programming
  – Optional External Resistor can be Used for High-Accurac.