Under-Voltage Lockout (UVLO) Protection
Totem Pole Output
Output Short Circuit Protection
Soft-Start Function
Wide Operating Frequency: 10kHz to 1MHz
Shutdown Control
Low Dissipation Current: Typical 1.6mA in Operation
SOP-8 & TSSOP-8 Package Available
General Description
The AAT1109 is a one-channel boost PWM controller incorporating a soft-start and a short circuit protection (SCP) function.
This device consists of an on-chip voltage reference, error amplifier, pulse width modulation controller, under-voltage lockout protection, soft-start, and short circuit protection circuits. Switching frequency up to 1MHz is set by an external resistor and capacitor. Soft-start time can be implemented by the SCP capacitor.
Additionally, a chip-enable feature is also provided to power down and reduce current supply to 10µA.  With minimal external components, the AAT1109 offers a simple and economical solution.