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TPS60231RGTRTI Pb-freeN/a2453avai3-Channel, Current-regulated 75-mA Charge Pump for White LED Backlight in 3x3 QFN
TPS60231RGTR/G4 |TPS60231RGTRG4TI/ROHSN/a824avaiWHITE LED CHARGE PUMP CURRENT SOURCE WITH PWM BRIGHTNESS CONTROL
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TPS60231RGTTTIN/a2894avai3-Channel, Current-regulated 75-mA Charge Pump for White LED Backlight in 3x3 QFN
TPS60231RGTTBB/TIN/a16700avai3-Channel, Current-regulated 75-mA Charge Pump for White LED Backlight in 3x3 QFN


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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 Each
The device providesa constant current for each LED,• LED Brightness Control Through PWM which the initial value can be set by an externalControl Signal resistor. The supply voltage ranges from 2.7Vto• High Efficiency by Fractional Conversion 6.5V andis ideally suited forall applications poweredWith1x 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 EMI
combination 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 deviceAPPLICATIONS 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
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