TPS60230 Datasheet | Texas Instruments

FEATURES - Regulated Output Current With 0.4% Matching - Drives up to 5 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 - Key Backlight DESCRIPTION The TPS60230 charge pump is optimized for white LED supplies in backlit color display applications. The device provides a constant current, set by an external resistor, for each LED. 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. The TPS60230 provides up to 25 m A per LED, for a total of 125 m A, for input voltages ranging from 3.1 V to 6.5 V. High efficiency is achieved by utilizing a 1x/1.5x fractional conversion technique in bination with very low dropout current sources. Additionally, 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. The TP60230 switches at 1 MHz operating frequency and is available in a small 16-pin QFN (RGT) package to keep board space to a minimum. VIN = 2.7 V to 6.5 V 1 m F 0.47 m F 0.47 m F VIN C1+ C1- C2+ C2- EN1 EN2 GND VOUT D1 D2 D3 D4 D5 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 this data sheet. PRODUCTION DATA information is current as of...