TPS60231RGTTG4_1219337

· Regulated Output Current With 0.4% Matching
· Drives up to 3 LEDs at 25 mA Each
· LED Brightness Control Through PWM Control Signal
· High Efficiency by Fractional Conversion With 1x and 1.5x Modes
· 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
· Ultra-Small 3mm x 3mm QFN Package

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

The TPS60231 charge pump is optimized for white LED supplies in color display backlight applications.

The TPS60231 provides a constant current for each LED,which the initial value can be set by an external resistor. The supply voltage ranges of TPS60231 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. Over an input voltage range from 3.1 V to 6.5 V, the device provides a high output current of up to 25 mA per LED with a total of 75 mA. High efficiency is achieved by utilizing a 1x/1.5x fractional conversion technique in combi nation with very low dropout current sources. In addition, the current controlled charge pump ensures low input current ripple and EMI. Only two external 1 F and two 0.47 F capacitors of TPS60231 are required to build a complete small and low cost power supply solution.

To reduce board space to a minimum, the TPS60231 switches at 1 MHz operating frequency and is avail-able in a small 16-pin QFN (RGT) package.