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
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
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.