TPS60231 Description
The TPS60231 charge pump is optimized for white LED supplies in color display backlight applications. The device provides a constant current for each LED, which the initial value can be set by an external resistor. The supply voltage ranges from 2.7 V to 6.5 V and is ideally suited for all applications powered by a single LI-Ion battery cell or three to four NiCd, NiMH, or alkaline battery cells.
TPS60231 Key Features
- Regulated Output Current With 0.4% Matching
- Drives up to 3 LEDs at 25 mA Each
- LED Brightness Control Through PWM
- High Efficiency by Fractional Conversion
- 1 MHz Switching Frequency
- 2.7 V to 6.5 V Operating Input Voltage Range
- Internal Softstart Limits Inrush Current
- Low Input Ripple and Low EMI
- Overcurrent and Overtemperature Protected
- Undervoltage Lockout With Hysteresis
TPS60231 Applications
- White LED Backlight for Color Displays in Cellular Phones, Smart Phones, PDAs, Handheld PCs, Digital Cameras, and Camcorders