The LTC3215 is a low noise, high current charge pump DC/DC converter designed to power high current LEDs. The part includes an accurate programmable current source capable of driving loads up to 700mA from a 2.9V to 4.4V input. Low external parts count (two flying capacitors, one programming resistor and two bypass capacitors) makes the LTC3215 ideally suited for small, battery-powered applications. Built-in soft-start circuitry prevents excessive inrush cur- rent during start-up. High switching frequency enables the use of small external capacitors. LED current is pro- grammed with an external resistor. The LED is discon- nected from VIN during shutdown. An ultralow dropout current source maintains accurate LED current at very low I
The LTC3215 is a low‑noise, high‑current charge‑pump DC/DC converter designed to drive LEDs up to 700 mA from a 2.9 V to 4.4 V input. It features three boost modes (1x, 1.5x, 2x), automatic mode switching, ultralow dropout current source, and a tiny 3 mm × 3 mm 10‑lead DFN package.
The datasheet provides electrical characteristics, pin descriptions, operation details, thermal protection, soft‑start behavior, and recommended component selections for low noise and stable operation. Typical applications include camera flash, torch lights, and general LED lighting.
| Input Voltage Range | 2.9 V to 4.4 V |
|---|---|
| Maximum LED Output Current | 700 mA (continuous), 350 mA continuous / 700 mA pulsed |
| Output Current Capability | up to 700 mA |
| Boost Modes | 1x, 1.5x, 2x |
| Shutdown Current | 2.5 µA |
| LED Current Programming Accuracy | 4 % |
| Oscillator Frequency | 0.9 MHz (typical) |
| Package | 10‑Lead (3 mm × 3 mm) Plastic DFN |
The device can drive LED currents up to 350 mA continuously and up to 700 mA in pulsed operation.
It supports three boost modes: 1x, 1.5x, and 2x.
The shutdown current is specified as 2.5 µA.
The typical oscillator frequency is 0.9 MHz.