LTC3207EUF#PBF

LTC3207 is a highly integrated multi-display LED driver. This device contains a high-efficiency, low-noise charge pump to provide power to 12 universal LED current sources and one camera LED current source. It require only five small ceramic capacitors to form a complete LED power supply and current controller. The display currents are set by an internal precision current reference. Independent dimming, On/Off, blinking and gradation control for all universal current sources is achieved via the I²C serial interface. 6-bit linear DACs are available for adjusting brightness levels for each universal LED current source. The CAM current source has a 4-bit linear DAC to adjust brightness. This device charge pumps optimize efficiency based on the voltage across the LED current sources. The device powers-up in 1x mode and will automatically switch to boost mode whenever any enabled LED current source begins to enter dropout. It is used in application like video phones with QVGA+ displays.

• Slew limited switching reduces conducted and radiated noise (EMI)
• Low noise, multi-mode charge pump (1x, 1.5x, 2x) provides up to 91% efficiency
• Internal current reference, short-circuit/thermal protection
• Configurable ENU pin for asynchronous LED on/off control
• Automatic or forced mode switching, upto 600mA total output current
• Internal soft-start limits inrush current
• Twelve 28mA universal current sources with 64-step linear brightness control
• IVBAT operating current is 0.5mA typical at (ICPO = 0, 1x mode)
• VBAT operating voltage range is 2.9V to 5.5V
• Operating temperature is -40°C to 85°C, package style is 24-lead plastic QFN

บันทึก

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