FEATURES

· Regulated Output Current With 0.4%

Matching

· 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 Ad·

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 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 a

1x/1.5x fractional conversion technique in combi-

nation with very low dropout current sources. Ad·

ditionally, 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

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.