The LT ®1308 is a micropower, fixed frequency boost DC/DC converter that operates from an input voltage as low as 1V.
The LT1308 is a micropower, fixed‑frequency boost DC‑DC converter that operates from an input voltage as low as 1 V. It can deliver 5 V at 1 A from a single Li‑ion cell or 3.3 V at 300 mA from a single NiCd cell, with a low quiescent current of 100 µA and a shutdown current of only 3 µA. The device features a 600 kHz switching frequency, a low‑battery detector with a 200 mV reference, and a low‑voltage switch drop of 300 mV at 2 A.
The datasheet includes detailed electrical characteristics, pin descriptions, layout hints, and typical application circuits for GSM, DECT, and digital camera power supplies. Proper PCB layout is critical for performance, especially minimizing trace length to the input capacitor and keeping high‑current traces short.
| Output Voltage (Li‑ion) | 5 V at 1 A |
|---|---|
| Output Voltage (NiCd) | 3.3 V at 300 mA |
| Quiescent Current (no load) | 100 µA |
| Shutdown Current | 3 µA |
| Switching Frequency | 600 kHz |
| Switch Voltage Drop (2 A) | 300 mV |
| Low‑Battery Reference | 200 mV |
| Minimum Input Voltage | 0.92 V |
| Input Voltage Range | 1 V – 6 V |
The LT1308 can deliver up to 1 A at 5 V from a single Li‑ion cell.
The no‑load quiescent current is 100 µA.
Ground the SHDN pin to turn the device off; tying it to a voltage above Vjy enables operation.
The low‑battery detector uses a 200 mV reference on the LBI pin.