Impala Linear Corporation ILC6390/91 SOT-89 Step-Up PFM Switcher with Auto-Load Sense General Description 50 mA boost converter using Pulse Frequency Modulation, or PFM, technique, in 5-lead SOT-89 or a 5-lead SOT-23 package.
Only 3 external components are needed to complete the switcher design.
The ILC6390 automatically senses load variations to choose between 55% and 75% duty cycles.
Normal operation is 55% duty at 155kHz; when load currents exceed the internal comparator trip point, a “turbo mode” kicks in to provide extended on-time switching (75% duty at 100kHz oscillation).
Requiring only 30µA of supply current, the ILC6390 achieves efficiencies as high as 85% at 5V yet shuts down to ...

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