The LT1618 is a step-up DC/DC converter with constant current and constant voltage output characteristics. It is suitable for applications such as LED backlight drivers, USB-powered boost converters, input current limited boost converters, and battery chargers. The converter features accurate input/output current control, accurate output voltage control, wide input voltage range, high output voltage, high efficiency, and small size.
The LT1618 is a constant‑current/constant‑voltage step‑up DC/DC converter that operates from 1.6 V to 18 V input and delivers up to 35 V output. It features a 1.4 MHz switching frequency, low voltage sense switch, and selectable 10‑pin DFN or MSOP packages.
The document includes absolute maximum ratings, detailed electrical characteristics, pin descriptions, block diagram, typical performance curves, and extensive application information such as inductor, capacitor, and diode selection, as well as guidance on output‑voltage setting, current‑sense adjustment, and frequency compensation.
| Input Voltage Range | 1.6 V – 18 V |
|---|---|
| Switching Frequency | 1.4 MHz |
| Maximum Output Voltage | 35 V |
| Maximum Switch Duty Cycle | 88 % – 92 % |
| Switch Current Limit | 2.8 A |
| Reference Voltage (FB pin) | 1.263 V (typical) |
The LT1618 operates at a fixed switching frequency of 1.4 MHz.
The device can deliver up to 35 V on its output.
The LT1618 has 10 functional pins plus an exposed pad (pin 11) that is tied to ground.
It accepts an input voltage from 1.6 V up to 18 V.