TPS60230

Features:

· Regulated Output Current With 0.3% Matching Over Temperature
· Drives up to 5 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


Application

· White LED Backlight for Color Displays in Cellular Phones, Smart Phones, PDAs, Handheld PCs, Digital Cameras, and Camcorders
· Key Backlight


Specifications

		UNIT
VI TJ TA Tst	Supply voltage Voltage at EN1, EN2, VOUT, ISET Output current at VOUT Maximum junction temperature Operating free-air temperature Storage temperature Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds	0.3 V to 7 V 0.3 V to VI 200 mA 150°C 40°C to 85°C 65°C to 150°C 300°C

Description

The TPS60230 charge pump is optimized for white LED supplies in backlit color display applications. Thedevice 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 NiCd, NiMH, or Alkaline battery cells. The TPS60230 provides up to 25 mA per LED, for a total of 125 mA, for input voltages ranging from 3.1 V to 6.5 V. High efficiency is achieved by utilizing a1x/1.5x fractional conversion technique in combi- nation 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 of TPS60230 are required to build a complete 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.