LED7708

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The LED7708 has been specifically designed to supply several LEDs starting from a single low-voltage rail. It integrates a boost controller, sixteen current generators and a 4-wire serial interface. The boost controller regulates the output voltage in an adaptive way, according to the LED requirements, resulting in an improved overall efficiency. All the current generators are 40 V-rated, allowing the LED7708 to drive several LEDs in series on each channel. The channels can be put in parallel for higher output current.

The brightness of the LEDs is controlled by using the serial interface. A selectable 12-bit or 16-bit grayscale brightness control allows independent PWM on each channel. A programmable on-chip dimming oscillator is provided for external circuitry simplification. The device has dedicated pins to lock to an external synchronization with other devices (master or slave) for noise reduction in multi-device applications. The LED7708 implements basic protection (OVP, OCP and thermal shutdown) as well as LED array protection. It can detect and manage open-LED and shorted-LED faults and different fault-management options are available in order to cover most application needs.

Key Features

Boost controller section
- 3.6 V to 36 V input voltage range (LDO)
- Adaptive output voltage for high efficiency
- Internal +5 V LDO for gate driver supply
- Internal +3.3 V LDO for device supply
- High performance external MOSFET driver
- 250 kHz to 1 MHz switching frequency
- Programmable OV and OC protection
- Fixed frequency peak current-mode control
- External synchronization for multi-device application
- Overtemperature alert and thermal shutdown
LED array driver section
- 16 channels with 85 mA/ch current capability
- ±2% channel current accuracy
- ±2% channel-to-channel current matching
- LED short-circuit and open channel fault detection and management
- 4-wire, 30 MHz serial interface
- 16 x16-bit, 1x256-bit or 1x192-bit serial data formats
- Grouped or independent channel PWM control
- Selectable 12/16-bit grayscale brightness control for local dimming
- Programmable internal dimming oscillator
- Programmable grayscale latency
- Master/slave chain configuration supported

Resources

Technical Documentation

Product Specifications

	Description	Version	Size
	DS8850: 16 channels x 85 mA LED driver with boost controller and 4-wire serial interface	1.0	855 KB

Publications and Collaterals

Brochures

	Description	Version	Size
	Brochure Power management guide	09.2017	3 MB
	LED drivers for backlighting and lighting applications	2.1	1 MB

Tools and Software

Evaluation Tools

Solution Evaluation Tools

Part Number	Manufacturer	Description
STEVAL-ILL035V1		Multi-channel LED driver with integrated boost controller for medium, large LCD panel backlight based on LED7708 and STM32F103C6T6A
STEVAL-ILL035V2	ST	Multi-channel LED driver with integrated boost controller for medium/large LCD panel backlight based on LED7708 and STM32F103C6T6 - daughter board

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Sample & Buy

Part Number	Marketing Status	Quantity	Unit Price (US$) *	Package	Packing Type	Operating Temperature (°C) (min)	Operating Temperature (°C) (max)	ECCN (EU)	ECCN (US)	Country of Origin	More info	Order from ST	Order from Distributors
LED7708TR	Active : Product is in volume production	1000	1.591	VFQFPN 48 7x7x1.0	Tape And Reel	-40	150	NEC	EAR99	PHILIPPINES	MORE INFO		No availability reported, please contact our Sales office
LED7708	Active : Product is in volume production	1000	1.591	VFQFPN 48 7x7x1.0	Tray	-40	150	NEC	EAR99	-	MORE INFO		No availability reported, please contact our Sales office

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors

Quality & Reliability

Part Number	Marketing Status	Package	Grade	RoHS Compliance Grade	Material Declaration**
LED7708TR	Active	VFQFPN 48 7x7x1.0	Industrial	Ecopack2
LED7708	Active	VFQFPN 48 7x7x1.0	Industrial	Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.