The LTC3426 is a 1.2MHz step-up DC/DC converter in SOT-23 package. It features an internal 2A MOSFET switch, 1.2MHz switching frequency, integrated soft-start, and low 1.6V VIN operation. The converter can deliver 5V at 800mA from a 3.3V input or 3.3V at 800mA from a 2.5V input. It is suitable for applications with limited space and requires small, low profile external components. The LTC3426 can be used for white LED driver supply, local 3.3V or 5V supply, and battery backup.
The LTC3426 is a monolithic 1.2 MHz boost converter housed in a 6‑lead SOT‑23 package. It delivers up to 5.5 V output from inputs as low as 1.6 V and includes an internal 2 A MOSFET switch, soft‑start, and low shutdown current.
The document contains absolute maximum ratings, electrical characteristics, pin descriptions, typical performance curves, layout guidelines, and example applications with recommended component selections.
| Input Voltage Range (absolute max) | -0.3 V to 6 V |
|---|---|
| Minimum Operating Input Voltage | 1.6 V |
| Output Voltage Adjust Range | 2.25 V to 5 V |
| Feedback Reference Voltage | 1.22 V (typical) |
| Shutdown Quiescent Current | < 0.5 pA |
| Switching Frequency | 1.2 MHz (typical) |
| Current Limit | 2 A (typical) |
| Switch On Resistance | 0.11 Ω (typical) |
The absolute maximum input voltage is 6 V.
The device typically switches at 1.2 MHz.
The shutdown quiescent current is less than 0.5 pA.