The LP3933 is a complete lighting management system designed for portable wireless applications. It contains a boost DC/DC converter, 4 white-LED drivers to drive the main LCD panel backlight, 2 white-LED drivers for the sub- LCD panel and two sets of RGB/FLASH LED drivers. Both backlight drivers have 8-bit constant current drivers that are separately adjustable and matched to 0.5% (typ.). The RGB LED drivers are PWM-driven with programmable color, intensity and blinking patterns. In addition, they feature a FLASH function to support picture taking with camera- enabled cellular phones. An efficient magnetic boost DC/DC converter provides the required bias for LEDs, operating from a single Li-Ion bat- tery. The DC/DC converter output voltage is user program- mable from 4.1V to 5.3V for adapting to different LED types and for efficiency optimization. All functions are software controllable through a SPI interface and 19 internal registers.
The LP3933 integrates a magnetic boost DC‑DC converter, four white‑LED drivers for the main LCD backlight, two white‑LED drivers for a sub‑LCD panel, and two PWM‑driven RGB/FLASH LED driver sets. All functions are software‑controllable via a 19‑register SPI interface, and the boost output voltage can be programmed from 4.1 V to 5.3 V.
The device is supplied in a 32‑lead thin CSP package (4.5 × 5.5 × 0.8 mm) and is rated for operation from –40 °C to +125 °C. It targets portable wireless products such as cellular phones and PDAs, offering high‑efficiency LED control, programmable current limits, and low‑voltage digital interfaces.
| Boost converter output voltage range | 4.1 V to 5.3 V |
|---|---|
| LED driver current adjustment | 0 … 25 mA per LED |
| Boost converter maximum current | 300 mA |
| Package type and dimensions | 32‑Lead Thin CSP, 4.5 × 5.5 × 0.8 mm |
| Operating temperature range | -40 °C to +125 °C |
The LP3933 is controlled through an SPI serial bus interface with 19 internal registers.
The boost converter can supply up to 300 mA.