The LT ®1615/LT1615-1 are micropower step-up DC/DC converters in a 5-lead low profile (1mm) ThinSOT pack- age.
This handbook describes the LT1615 and LT1615‑1 micropower step‑up DC/DC converters packaged in a 5‑lead ThinSOT (1 mm) form factor. It outlines key features such as low quiescent current, operation from 1 V to 15 V input, and output voltages up to 34 V. The document includes absolute maximum ratings, electrical characteristics, pin descriptions, and a block diagram of the converter architecture.
The guide also offers design assistance, covering inductor, capacitor, and diode selection, as well as typical boost and SEPIC applications. Detailed performance graphs, typical application schematics, and recommended component tables help engineers integrate the devices into handheld computers, LCD bias circuits, battery‑backup supplies, and other space‑constrained portable systems.
| Input Voltage Range | 1.2 V to 15 V |
|---|---|
| Output Voltage Limit | Up to 34 V |
| Quiescent Current (Active Mode) | 20 µA |
| Quiescent Current (Shutdown) | 0.5 µA |
| Switch Saturation Voltage | 250 mV at 300 mA |
| Current Limit (LT1615) | 300 mA |
| Shutdown Input Voltage High | 0.9 V |
| Shutdown Input Voltage Low | 0.25 V |
| Switch Off Time | 400 ns |
The LT1615 draws 20 µA of quiescent current when operating in active mode.
The device operates from 1.2 V up to 15 V input voltage.
The output voltage is set by selecting resistor values for R1 and R2 connected to the FB (feedback) pin.
The Motorola MBR0520 surface‑mount Schottky diode (0.5 A, 20 V) is recommended.