Boost PWM with Internal NMOS
Wide PWM Dimming Range: 100Hz to 200kHz
2.7V to 5.5V Input Voltage Range
Under-Voltage Lockout (UVLO) Protection
Internal Over Voltage and Thermal Protection
Internal Soft-Start
Fixed Switching Frequency: 1.3MHz
0.1μA Shutdown Current
Small TSOT-23-6 and SOT-23-6 Package
General Description
The AAT1507 is a boost DC-DC converter for white LEDs. Series connection of the LEDs allows consistent currents essential for uniform brightness, and also eliminates the need for ballast resistors. The 28V over voltage comparator can also be used to prevent output open-circuit, caused by bond wire breakages.
The AAT1507 switches at 1.3MHz. Optional external components may be added if required. The optimized input/output capacitor and a low feedback voltage to minimize power loss in current setting resistor makes AAT1507 a power-smart solution.
The AAT1507 is available in a space-saving TSOT23-6 (TSOT26), and SOT23-6 (SOT26) packages, which are ideal for portable applications.
Cell Phones
Small LCD Displays