The LT1108 is an improved version of the LT1173, which uses a 60% duty cycle for lower power consumption and higher output current. Suitable for battery-powered systems, it can operate over a 2V to 30V voltage range and output adjustable 5V or 12V.
The LT1108 is a versatile micropower DC/DC converter that operates from 2 V to 30 V and can deliver fixed 5 V or 12 V outputs, or adjustable voltages. It requires only four external components and includes an internal 1 A power switch, low‑battery detector, and user‑adjustable current limit.
The document details electrical characteristics, pin functions, typical performance curves, and design guidance such as inductor selection, gain‑block usage, and current‑limit circuitry, along with typical application examples and package dimensions.
| Supply Voltage Range | 2 V to 30 V |
|---|---|
| Quiescent Current (Switch OFF) | 110–150 pA |
| Oscillator Frequency | 14 kHz to 25 kHz |
| Duty Cycle (Full Load, Step‑Up) | 63 % to 78 % |
The quiescent current when the switch is off is between 110 pA and 150 pA.
It operates from 2 V up to 30 V supply voltage.
Only four external components are needed.