Product overview
Description
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.
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All 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
- Boost controller section
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STMicroelectronics - LED7708
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| LED7708 | Preview | VFQFPN 48 7x7x1.0 mm | Industrial | Ecopack2 | |
| LED7708TR | Active | VFQFPN 48 7x7x1.0 mm | 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.
Sample & Buy
| Part Number | Order from distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| LED7708TR | distributors No availability of distributors reported, please contact our sales office | Active | EAR99 | NEC | Tape and Reel | VFQFPN 48 7x7x1.0 mm | -40 | 150 | PHILIPPINES | | ||
| LED7708 | distributors No availability of distributors reported, please contact our sales office | Preview | EAR99 | NEC | Tray | VFQFPN 48 7x7x1.0 mm | -40 | 150 | PHILIPPINES | | ||
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors