General Description

100mA boost converter in 5-lead SOT-89 package using both PFM and PWM conversion techniques. In normal operation the ILC6380 runs in PWM mode running at one of three fixed frequencies. At light loads the ILC6380 senses when the duty cycle drops to approximately 10, and automatically switches into a power-saving PFM switching technique. This maintains high efficiencies both at full load and in system sleep conditions.

Only 3 external components are needed to complete the switcher design, and standard voltage options of 2.5, 3.3, and 5.0V at ±2.5 accuracy feature on-chip phase compensation and soft-start design.

ILC6381 drives an external transistor for higher current switcher design, with all of the features and benefits of the ILC6380.

Package Features

♦ 85 efficiency at 50mA

♦ Start-up voltages as low as 900mV

♦ ±2.5 accurate outputs

♦ Complete switcher design with only 3 external components

♦ 50, 100 and 180kHz switching frequency versions available

♦ Shutdown to 0.5µA Iq

♦ External transistor option allows several hundred milliamp switcher design

Applications

♦ Cellular Phones, Pagers

♦ Portable Cameras and Video Recorders

♦ Palmtops and PDAs