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TPS60231RGTR-TPS60231RGTR/G4-TPS60231RGTRG4-TPS60231RGTT
3-Channel, Current-regulated 75-mA Charge Pump for White LED Backlight in 3x3 QFN
VIN
C1+
C1−
C2+
C2−
EN1
EN2
GND PGND
VOUT
ISET
0.47 F
0.47 F
1 F
1 FVIN = 2.7 V
to 6.5 V
TPS60231
www.ti.com SLVS544A –OCTOBER 2004–REVISED FEBRUARY
WHITE LED CHARGE PUMP CURRENT SOURCE
WITH PWM BRIGHTNESS CONTROL
Checkfor Samples: TPS60231
1FEATURES
DESCRIPTION• Regulated Output Current With 0.4%
Matching The TPS60231 for white
LED suppliesin color display backlight applications.
• Drives upto3 LEDsat25 mA EachThe device providesa constant current for each LED,
• LED Brightness Control Through PWM which the initial value can be set by an external
Control Signal resistor. The supply voltage ranges from 2.7Vto
• High Efficiency by Fractional Conversion 6.5V andis ideally suited forall applications powered
With1x and 1.5x Modes bya single LI-Ion battery cellor threeto four NiCd,
NiMH,or alkaline battery cells. Over an input voltage
• 1 MHz Switching Frequency range from 3.1Vto 6.5V, the device providesa high
• 2.7Vto 6.5V Operating Input Voltage Range output currentofupto 25 mA per LED witha totalof
• Internal Softstart Limits Inrush Current 75 mA. High efficiencyis achieved by utilizinga
1x/1.5x fractional conversion technique in
• Low Input Ripple and Low EMIcombination with very low dropout current sources.In
• Overcurrent and Overtemperature Protected addition, the current controlled charge pump ensures
• Undervoltage Lockout With Hysteresis low input current ripple and EMI. Only two externalµF and two 0.47µF capacitors are requiredto build
• Ultra-Small 3mmx 3mm QFN Package complete small and low cost power supply solution. reduce board spacetoa minimum, the device
APPLICATIONS switches at1 MHz operating frequency and is
• White LED Backlight for Color Displaysin availableina small 16-pin QFN (RGT) package.
Cellular Phones, Smart Phones, PDAs,
Handheld PCs, Digital Cameras, and SPACER
Camcorders Keypad Backlight
