AAT3152IWP-T1

The AAT3152IWP-T1 is a current regulated boost/buck converter designed specifically for powering white LEDs in LCD backlight displays. It provides adjustable output voltage, current, and double-ended current sensing capability. It is a compact, high-efficiency switching power supply that is adjustable between 0.9V and 5.5V and can supply up to 20mA of current. The AAT3152IWP-T1 is designed to be integrated directly into an LCD backlight display, allowing direct connection to the LEDs, eliminating the need for external discrete components.

The AAT3152IWP-T1 is ideal for applications that require high-efficiency current regulation for powering white LEDs in areas such as LCD backlighting, automotive lighting, and general purpose high-power LED applications. It is equipped with integrated features that enable the use of a wide range of LEDs, from 0.3V to 5.5V, up to 20mA each, with current regulation from 0.2mA to 20mA per LED. By using multiple external current sensing resistors it is possible to match the LED current accurately, resulting in operation free from excessive power dissipation.

The AAT3152IWP-T1 boost controller utilizes peak-current mode control and is designed to regulate output current using a control loop and external current sensing resistor. An internal loop regulates the output voltage as a fraction of the input voltage. When operating in Boost mode, the chip changes the voltage at the output in relation to the voltage at the input starting from 0.9V. In Buck mode, it regulates the output current in proportion to the input voltage, enabling the use of a wide range of LED voltages. The chip is designed to operate either in continuous conduction or discontinuous conduction mode (DCM). In DCM, the efficiency of the switching regulator is improved as the current through the diode is reduced.

The AAT3152IWP-T1 features an open-drain enable pin that can be used to enable/disable the chip. This pin can also be used to reduce supply current during periods of low current demand. The chip also has an adjustable soft start feature, which can be used to reduce inrush current when turning on the device. This feature can also be used to reduce the noise at the output and protect against power surges.

The AAT3152IWP-T1 has a large number of other features including: over current protection, under voltage lockout, over temperature protection, and adjustable switching frequency. The switching frequency can be adjusted to optimize system performance as well as reduce EMI. All of these features make the AAT3152IWP-T1 the perfect choice for powering white LEDs in LCD backlighting and other high-power LED applications.