LED7706| Datasheet

LED7706, LED7706TR

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LED7706
6-rows 30 mA LEDs driver with boost regulator for LCD panels backlight
Features

Boost section 4.5 V to 36 V input voltage range Internal power MOSFET Internal +5 V LDO for device supply Up to 36 V output voltage Constant frequency peak current-mode control 250 kHz to 1 MHz adjustable switching frequency External synchronization for multi-device application Pulse-skip power saving mode at light load Programmable soft-start Programmable OVP protection Stable with ceramic output capacitors Thermal shutdown Backlight driver section Six rows with 30 mA maximum current capability (adjustable) Parallelable rows for higher current Rows disable option Less than 500 ns minimum dimming time (1 % minimum dimming duty-cycle at 20 kHz) 2 % current matching between rows LED failure (open and short-circuit) detection

VFQFPN-24 4x4

Description
The LED7706 consists of a high efficiency monolithic boost converter and six controlled current generators (rows) specifically designed to supply LED arrays used in the backlighting of LCD panels. The device can manage an output voltage up to 36 V (i.e. 10 white LEDs per row). The generators can be externally programmed to sink up to 30 mA and can be dimmed via a PWM signal (1 % dimming duty-cycle at 20 kHz can be managed). The device allows to detect and manage the open and shorted LED faults and to let unused rows floating. Basic protections (Output Over-Voltage, internal MOSFET Over-Current and Thermal Shutdown) are provided.

Applications

LCD monitors and TV panels PDA panel backlight GPS panel backlight Device summary
Order code LED7706 VFQFPN-24 4x4 (exposed pad) LED7706TR Tape and reel Rev 1 1/31
www.st.com 31

Table 1.

Package

Packaging Tube

February 2008