Charge Pump, 7-Channel Fun Lighting LED Driver
Additionally, automated blinking routines can be independently programmed and enabled for all seventh LED channels. These LEDs can also be combined into groups to reduce the processor instructions. Driving this entire configuration is a two-capacitor charge pump with gains of 1×, 1.5×, and 2×. This setup is capable of driving a maximum IOUT of 240 mA from a supply of 2.5 V to 5.5 V. The device includes a variety of safety features including shortcircuit, overvoltage, and overtemperature protection. These features allow easy implementation of a safe and robust design. Additionally, input inrush currents are limited via an integrated soft start combined with controlled input to output isolation.
The ADP8863 is available in a compact LFCSP (lead frame chip scale package).
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This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
The interrupt line, from the ADP8860 to the processor, is used to indicate a failure condition, such as a thermal shutdown or an overvoltage and LED/output short circuit, or to indicate a light level threshold has been crossed. All interrupt sources are maskable. Refer to Figure 1 for a typical application diagram. Figure 2 shows a schematic with keypad light control.
The interrupt line is active low; each interrupt source has an individual masking bit. The processor can reset the ADP8860 anytime by pulling the nRST line low; this operation reinitia-lizes the ADP8860 at the default state and places the device in standby mode.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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