AAT2869 - Advanced Analogic Technologies

AAT2869 constant-frequency charge pump DC/DC converter

The AAT2869 is a low-noise, constant-frequency charge pump DC/DC converter that uses a dual-mode load switch (1x) and fractional (1.5x) conversion to maximize efficiency for white LED applications. The AAT2869 is capable of driving 4 white LEDs at a total of 124mA from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for dr.

Features

• 2.7V to 5.5V Supply Voltage Range
• Charge Pump for LED Driver ▪ Dual Mode 1x/1.5x ▪ Drives up to 4 LEDs with up to 31mA each ▪ Linear LED Output Control Options
• Maximum LED Current Set by AS2Cwire Interface, 32 Steps
• Fade In and Fade Out
• 0.9MHz Constant Frequency
• Automatic Soft-Start Limits Inrush Current
• Dual 150mA LDOs ▪ Five Voltages with 1.2V, 1.5V, 1.8V, 2.8V, and 3.0V, Sixteen Combinations Set by AS2Cwire ▪ Enable Control Independently by AS2Cwire ▪ Integrated Discharge Resistor when Disabled
• < 1.0μA in Shutdown
• Short Circuit Protection
• Small Application Circuit
• -40°.