ALED7707 Series

6-row 85 mA LEDs driver with boost regulator for LCD panel backlights

Catalog

6-row 85 mA LEDs driver with boost regulator for LCD panel backlights

Part	Frequency [Max]	Frequency [Min]	Package / Case	Applications	Supplier Device Package	Number of Outputs	Mounting Type	Voltage - Supply (Max) [Max]	Voltage - Supply (Min) [Min]	Type	Qualification	Grade	Voltage - Output	Topology	Operating Temperature [Max]	Operating Temperature [Min]	Current - Output / Channel	Dimming
STMicroelectronics ALED7707TR
STMicroelectronics ALED7707	1 MHz	250 kHz	24-VQFN Exposed Pad	Backlight	24-QFN (5x5)	6	Surface Mount	36 V	4.5 V	DC DC Regulator	AEC-Q100	Automotive	36 V	Step-Up (Boost)	150 °C	-40 °C	85 mA	PWM
STMicroelectronics ALED7707

Catalog

6-row 85 mA LEDs driver with boost regulator for LCD panel backlights

Key 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 85 mA maximum current capability (adjustable)

- Rows disable option

- Less than 10 μs minimum dimming on-time

- ± 3% current matching between rows

- LED failure (open and short-circuit) detection

Description

The ALED7707 device consists of an automotive grade (AEC Q100 compliant) 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 85 mA and can be dimmed via a PWM signal (1% dimming duty cycle at 1 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 overvoltage, internal MOSFET overcurrent and thermal shutdown) are provided.