The AAT1239-1 is a high frequency, high efficiency constant current boost converter capable of driving up to ten (10) series-connected white LEDs or 40V. It is an ideal power solutions for backlight applications with up to ten white LEDs in series. The input voltage is 2.7V to 5.5V for single-cell lithium-ion/polymer (Li-ion) based portable devices. The LED current is digitally controlled across a 6x operating range using AnalogicTech’s Simple Serial Control™ (S2Cwire™) interface. Programmability across 26 discrete current steps provides high resolution, low noise, flicker-free, constant LED outputs. In programming AAT1239 operation, LED brightness increases based on the data applied at the EN/SET pin. The SEL logic pin changes the feedback voltage between two programmable ranges. The AAT1239-1 features a high current limit and fast, stable transitions for stepped or pulsed current applications. The high switching frequency (up to 2MHz) provides fast response and allows the use of ultra-small external components, including chip inductors and capacitors. Fully integrated control circuitry simplifies design and reduces total solution size. The AAT1239-1 offers a true load disconnect feature which isolates the load from the power source while in the OFF or disabled state. This eliminates leakage current.
The AAT1239-1 is a high‑frequency, high‑efficiency step‑up converter designed for backlight applications that require 4 to 10 series‑connected white LEDs. It operates from a 2.7 V to 5.5 V input and provides a regulated 40 V output with up to 30 mA continuous current. Digital control via the Simple Serial Control (S2Cwire) interface gives 26 discrete current steps and eliminates the need for external PWM circuitry.
Typical applications include color‑display backlights, digital still cameras, photo frames, PDAs, notebook PCs, and other battery‑powered devices. The device is supplied in a Pb‑free 12‑pin TSOPJW package and includes features such as load disconnect, over‑voltage protection, and a fast 2 MHz switching frequency that allows the use of ultra‑small external components.
| Input Voltage Range | 2.7 V – 5.5 V |
|---|---|
| Maximum Continuous Output | 40 V @ 30 mA |
| Switching Frequency | up to 2 MHz |
| Efficiency | up to 85 % |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | 12‑Pin TSOPJW |
| LED Drive Capability | Up to 10 white LEDs in series |
The converter operates from 2.7 V to 5.5 V input.
It can drive up to 10 white LEDs connected in series.
The device provides a regulated 40 V output.
Efficiency can reach up to 85 % under typical conditions.