The LTC3214 is a low noise, high current charge pump DC/DC converter capable of driving high current LEDs at up to 500mA from a 2.9V to 4.5V input. Low external parts count (two flying capacitors, one programming resistor and two bypass capacitors at VIN and CPO) make the LTC3214 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. Output current level is programmed by an external resis- tor. LED current is regulated using an internal 110mΩ sense resistor. Automatic mode switching optimizes effi- ciency by monitoring the voltage across the charge pump and switching modes only when dropout is detected. The part is available in a low profile 3mm x 3mm 10-lead DFN package.
The LTC3214 is a charge‑pump DC/DC converter designed for small, battery‑powered devices such as LED torches, camera lights, and flash applications. It operates with a fractional switched‑capacitor architecture, providing up to three boost modes (1×, 1.5×, 2×) and automatic mode switching for optimal efficiency, which can reach 94 %.
The device is supplied in a 3 mm × 3 mm 10‑lead DFN package and requires only two flying capacitors, a programming resistor, and a few bypass capacitors. Built‑in features include soft‑start, over‑temperature shutdown, open‑ and short‑LED protection, and an internal 110 mΩ LED current‑sense resistor. Detailed layout guidelines, capacitor selection advice, and thermal management recommendations are provided to ensure stable operation.
| Input Voltage Range | 2.9 V – 4.5 V |
|---|---|
| Efficiency | Up to 94 % |
| Package | 3 mm × 3 mm 10‑lead DFN |
| Internal LED Sense Resistor | 110 mΩ |
Only low‑ESR ceramic capacitors (X5R, X7R) should be used; polarized capacitors such as tantalum or aluminum must not be used.
The exposed pad must be soldered to a large low‑impedance ground plane to provide proper heat sinking and noise protection.