The ILC6390/91 SOT-89 Step-Up PFM Switcher with Auto-Load Sense is a switch power chip that uses Pulse Frequency Modulation technology. The efficiency is as high as 85%, the switching frequency is 100kHz/155kHz, and it can provide 2.5V, 3.3V, and 5.0V three output voltages. The output current can reach 50mA.
The ILC6390 and ILC6391 are 50 mA boost converters that use Pulse‑Frequency Modulation (PFM) to achieve up to 85 % efficiency. They operate from a 5‑lead SOT‑89 or SOT‑23 package and require only three external components – an inductor, a Schottky diode and a tantalum output capacitor.
The devices automatically select duty cycles (55 % at 155 kHz or 75 % at 100 kHz in turbo mode) based on load current, and they shut down to a minimum 0.5 µA. Standard output voltages are 2.5 V, 3.3 V and 5.0 V, with options for external‑transistor configurations (ILC6391).
| Conversion efficiency | 85 % at 50 mA |
|---|---|
| Startup voltage | 0.9 V |
| Shutdown current | 0.5 µA max |
| Supply current (no‑load) | 30 µA |
| Typical output voltages | 2.5 V, 3.3 V, 5.0 V |
| Duty cycle (normal mode) | 55 % at 155 kHz |
The device shuts down to a maximum of 0.5 µA.
Only three external components are needed: an inductor, a Schottky diode, and a tantalum output capacitor.
It uses a 55 % duty cycle at 155 kHz.
Standard output voltages are 2.5 V, 3.3 V, and 5.0 V.