LM2796

具有 3/2x 开关电容器升压的双显示白光 LED 驱动器

The is a charge-pump based white-LED driver that is ideal for mobile phone display backlighting. It can drive up to 7 LEDs in parallel with up to 20mA through each LED. Regulated internal current sources deliver excellent current and brightness matching in all LEDs. The LED-driver current sources are split into two independently controlled groups. The primary group 4 LEDs can be used to backlight the main phone display. The second group 3 LEDs can be used to backlight a secondary display or to provide other lighting features keypad LEDs, for example. Brightness of the two groups can be adjusted independently with pulse-width modulated PWM digital signals.

The LM2796 works off an extended Li-Ion input voltage range 2.7V to 5.5V. Voltage boost is achieved with a high-efficiency 3/2×-gain charge pump.

The LM2796 is available in ’s chip-scale 18-bump DSBGA package.

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Drives up to 7 LEDs with up to 20mA Each

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LEDs Controlled in 2 Distinct Groups, for Backlighting 2 Displays Main LCD and Sub-LCD

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Excellent Current and Brightness Matching

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High-Efficiency 3/2x Charge Pump

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Extended Li-Ion Input: 2.7V to 5.5V

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PWM Brightness Control: 100Hz - 1kHz

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18-bump Thin DSBGA Package: 2.1mm x 2.4mm x 0.6mm

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