TPS60231 Datasheet | Texas Instruments

FEATURES - Regulated Output Current With 0.4% Matching - Drives up to 3 LEDs at 25 m A 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 APPLICATIONS - White LED Backlight for Color Displays in Cellular Phones, Smart Phones, PDAs, Handheld PCs, Digital Cameras, and Camcorders - Keypad Backlight 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 Ni Cd, Ni MH, 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 m A per LED with a total of 75 m A. High efficiency is achieved by utilizing a 1x/1.5x fractional conversion technique in bination with very low dropout current sources. In addition, the current controlled charge pump ensures low input current ripple and EMI. Only two external 1 µF and two 0.47 µF capacitors are required to build a plete small and low cost power supply solution. To reduce board space to a minimum, the device switches at 1 MHz operating frequency and is available in a small 16-pin QFN (RGT) package. SPACER VIN = 2.7 V to 6.5 V 1 m F VIN C1+ 0.47 m F C1- C2+ 0.47 m F C2- EN1 EN2 GND VOUT D1 D2 D3 ISET PGND 1 m F Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of...