NRND = Not Recommended for New Design
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The AP3605 is a step-up DC/DC converter based on 1.5x charge pump current source, it is specially designed for °C supplies in backlight display. The AP3605 can provide constant current up to 20mA for each °C, which is programmed by an external resistor, so it has a total capability to provide 80mA for 4 °Cs. The chip has a good performance of °C current matching and allows PWM brightness dimming control. Additionally, high switching frequency up to 1MHz enables the use of two small external flying capacitors. Internal soft-start circuitry prevents excessive inrush current during start-up. The AP3605 supply voltage range is from 2.7V to 5.5V, ideally suited for applications powered by the Liion battery. The AP3605 is available in a 3mmx3mm QFN-3x3-16 tiny package. Its operating temperature range is -40oC to 85oC.
· Mobile Phone · MP3, MP4 · White LED Backlight in Mobile Phone, PDA
| Dimming | PWM |
|---|---|
| Efficiency (%) | 93 |
| Function | Charge Pump LED Driver |
| MaximumInput Voltage (V) | 5.5 |
| Maximum Output Current per Channel | 20 |
| Maximum Output Voltage (V) | 5.5 |
| MinimumInput Voltage (V) | 2.7 |
| Number of Regulated Output Channels | 4 |
| OperatingTemperatureRange (°C) | -40 to 85 |
| OVP | No |
| Quiescent Current (µA) | 1.5 |
| Soft Start | No |
| Standby Quiescent Current (µA) | 0.1 |
| SW RDS(ON) | N/A |
| Switching Frequency (MHz) | 1 |
| Typical Overcurrent Protection Current | N/A |
| VFB | N/A |
