The LTC 3440 is a high efficiency, fixed frequency, Buck- Boost DC/DC converter that operates from input voltages above, below or equal to the output voltage
The LTC3440 is a micropower synchronous buck‑boost DC/DC converter that operates from input voltages above, below, or equal to the output voltage. It delivers up to 600 mA continuous output current with efficiencies up to 96 % and features a programmable oscillator from 300 kHz to 2 MHz.
The device includes two N‑channel and two P‑channel MOSFET switches, a low‑quiescent current of 25 µA in burst mode, and a shutdown current below 1 pA. Pin functions, absolute maximum ratings, and typical performance characteristics are detailed in the document, along with typical application circuits for portable instruments.
| Input Start‑Up Voltage (min) | 2.4 V |
|---|---|
| Input Operating Range | 2.5 V – 5.5 V |
| Output Voltage Adjust Range | 2.5 V – 5.5 V |
| Feedback Voltage | 1.196 V – 1.244 V |
| Maximum Duty Cycle (Boost) | 55 % |
| Continuous Output Current | 600 mA |
The LTC3440 operates from an input voltage of 2.5 V to 5.5 V.
The converter can deliver up to 600 mA continuous output current.