| The CP2131 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 5.5 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 CP2131 provides up to 30 mA per LED, for a total of 90 mA, for input voltages ranging from 3 V to 5.5 V. High efficiency is achieved by utilizing a 1x/1.5x adaptive fractional conversion technique in combination with very low dropout current sources. Additionally, the current controlled charge pump ensures low input current ripple and EMI. Only two external 1¦ÌF and two 0.47 ¦ÌF capacitors are required to build a complete small and low cost power supply solution. The CP2131 switches at 1 MHz operating frequency and is available in a small 16-pin QFN package to keep board space to a minimum. |
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| OVERVIEW |
• Drives up to 3 LEDs at 30 mA Each
• Regulated Output Current With 0.5% Matching Over Temperature
• High Efficiency by Adaptive Mode Selection Between 1x and 1.5x Modes
• LED Brightness Control Through PWM Control Signal£¨0Hz¡«50KHz£©
• Low Input Ripple and Low EMI
• No Inductors
• Fixed 1MHz Switching Frequency
• Over-current and Over-temperature Protected
• Undervoltage Lockout With Hysteresis
• Input Voltage Range: 2.7V to 5.5V
• Ultra-Small 3mm x 3mm QFN Package
• Less than 0.1¦ÌA Quiescent Current In Shutdown Mode
• RoHS Compliant and 100% Lead (Pb)-Free |
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| APPLICATIONS |
• Cell phone
• Digital Camera
• MP3,PMP,PDA |
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QFN16L
3mm*3mm
-40 oC ~ 85 oC |
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