16 channels x 85 mA LED driver with boost controller and 4-wire serial interface

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


Technical Documentation

Product Specifications
Description Version Size
DS8850 DS8850: 16 channels x 85 mA LED driver with boost controller and 4-wire serial interface 1.0 855 KB
Application Notes
Description Version Size
AN4140 AN4140: STLD41 output power capability 1.0 1 MB

Publications and Collaterals

Description Version Size
Brochure Power management guide 05.2016 4 MB
LED drivers for backlighting and lighting applications 2.1 1 MB

Tools and Software

Evaluation Tools
Solution Evaluation Tools
eDesignSuite Support & Community
Featured Products
Related Products

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 - - VFQFPN 48 7x7x1.0 Tape And Reel -40 150 NEC EAR99 PHILIPPINES MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY
LED7708 Active - - VFQFPN 48 7x7x1.0 Tray -40 150 NEC EAR99 - MORE INFO DISTRIBUTOR AVAILABILITY

(*) 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 ActiveVFQFPN 48 7x7x1.0IndustrialEcopack2 0 0
LED7708 ActiveVFQFPN 48 7x7x1.0IndustrialEcopack2 0 0

(**) 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.