The LTC3210-2/LTC3210-3 is a low noise charge pump DC/DC converter designed to drive three or four MAIN LEDs and one high current CAM LED for camera lighting. The LTC3210-2/LTC3210-3 require only four small ceramic capacitors and two current set resistors to form a complete LED power supply and current controller. Built-in soft-start circuitry prevents excessive inrush cur- rent during start-up and mode changes. High switching frequency enables the use of small external capacitors. Independent MAIN and CAM full-scale current settings are programmed by two external resistors. Shutdown mode and current output levels are selected via two logic inputs. ENM and ENC are toggled to adjust the LED currents via internal counters and DACs. A 5-bit linear DAC (32 steps) provides high resolution brightness control for the MAIN display. The charge pump optimizes effi ciency based on the volt- age across the LED current sources. The part powers up in 1x mode and will automatically switch to boost mode whenever any enabled LED current source begins to enter dropout. The LTC3210-2/LTC3210-3 are available in a 3mm × 3mm 16-lead QFN package.
The LTC3210‑2 and LTC3210‑3 are low‑noise charge‑pump DC/DC converters designed to drive multiple MAIN LEDs and a high‑current CAM LED for camera lighting. They provide up to 500 mA total output current, 32‑step linear brightness control for the MAIN display, and a single‑wire EN/Brightness control.
The device operates from 2.9 V to 4.5 V, features a 0.8 MHz clock, 0.4 ms mode‑switching delay, and a 3 pA shutdown current. It is supplied in a 3 mm × 3 mm 16‑lead plastic QFN package with an exposed ground pad. Pin functions, electrical characteristics, and typical performance curves are provided for design reference.
| Operating Voltage | 2.9 V – 4.5 V |
|---|---|
| Total Output Current | Up to 500 mA |
| Shutdown Current | 3 pA |
| Package | 3 mm × 3 mm 16‑lead plastic QFN |
| Clock Frequency | 0.8 MHz |
| Mode Switching Delay | 0.4 ms |
| MAIN LED Outputs | Three or four 25 mA low‑dropout outputs |
| CAM LED Output | One 400 mA low‑dropout output |
The device can deliver up to 500 mA total output current.
It provides three or four 25 mA low‑dropout MAIN LED outputs.
The shutdown current is 3 pA.
It is supplied in a 3 mm × 3 mm 16‑lead plastic QFN package.