The CAT3636 is a high efficiency quad-mode fractional charge pump that can drive up to six LEDs programmable by a one wire digital interface. The inclusion of a 1.33x fractional charge pump mode increases device efficiency by up to 10% over traditional 1.5x charge pumps with no added external capacitors. Low noise input ripple is achieved by operating at a constant switching frequency which allows the use of small external ceramic capacitors. The multi-fractional charge pump supports a wide range of input voltages from 2.5V to 5.5V.
The CAT3636 is a high‑efficiency quad‑mode fractional charge‑pump LED driver that can drive up to six LEDs with programmable currents via a one‑wire digital interface. It operates from 2.5 V to 5.5 V input, provides up to 92 % power efficiency, and includes features such as soft‑start, current limiting, short‑circuit and thermal‑shutdown protection.
Typical applications include LCD backlights, RGB LEDs, cellular phones, digital cameras and other handheld devices. Ordering information, pin configuration, electrical characteristics and timing diagrams are provided for designers, and the device is supplied in a 3 mm × 3 mm 16‑lead TQFN package.
| Output voltage (max) | 7 V |
|---|---|
| Total output current | 192 mA |
| Power efficiency | up to 92 % |
| Quiescent current (1.33× mode, VIN=3.3 V) | 2.8 mA |
| Thermal shutdown temperature | 150 °C |
| Package | 3 mm × 3 mm 16‑lead TQFN |
It can drive up to six LEDs, each up to 32 mA.
EN/SET is the device enable and 1‑wire addressable control input for all LED channels.
The part is supplied in a 3 mm × 3 mm 16‑lead TQFN package.