Leadis Technology, Inc. (NASDAQ: LDIS), an analog and mixed-signal semiconductor developer of LED drivers, and Touch ICs for mobile consumer electronic devices, announced sample availability of the LDS8710, an innovative inductor-based, high-efficiency LED Driver that eliminates the expensive external Schottky diode normally used in the rectification loop. The LDS8710 is the first in a family of drivers which includes the LDS8716 and LDS8714. The LDS8710/16/14 drive up to 10, 6 and 4 LEDs in series, respectively, from a single-cell Lithium-Ion battery.
The LDS8710 family is ideal for applications such as Smart Phones, Portable Multimedia Devices, Personal Navigation Systems and Digital Photo Frames where battery life, display size, resolution and brightness are critical.
Each device in the family features a patent-pending, integrated synchronous rectifier which eliminates the external Schottky diode and the need for complicated and costly isolation FETs. This reduces the bill of material and footprint of the display sub-system, and simplifies the design-in process and time to market of the end product.
The LDS8710 drives up to 10 LEDs with factory-preset maximum LED current values of 20, 25 or 30mA with 1% accuracy. This eliminates the need for an external sense resistor and further simplifies the system. Since the LDS8710 family operates at a fixed switching frequency, small low profile passive components (10 – 22 mH inductors and 0.1 mF high voltage ceramic capacitors) can be used, which further reduces the system’s bill of material and allows for a thin backlight unit profile. Moreover, the use of the 40-V rated integrated synchronous rectifier makes the efficiency dependent upon only one external component parameter: the inductor DCR. This further simplifies the system design, while simultaneously achieving greater than 83% efficiency.
“We are pleased to bring to the market the first LED Driver family featuring our patent-pending integrated synchronous rectifier. This novel architecture has been thought out with one main goal in mind: simplify our customers’ design experience and accelerate their time-to-market,” said Donato Montanari, Vice President at Leadis. “By reducing the number of external components, allowing customers to pre-select maximum current ratings, implementing robust protection (over voltage, under voltage, over temperature and over current) and offering wide PWM dimming frequencies (100Hz to 10K Hz), every feature of the LDS8710 family is meant to improve our customer’s time-to-market and reduce their bill of material.”
About the LDS8710, LDS8716 and LDS8714
The LDS8710 is a fixed 0.7MHz frequency, current mode, boost converter with internal 40-V rated synchronous rectifier and cycle-by-cycle switch current-limit. The device operates down to 2.5V to accommodate new chemistry Li-ion single-cell batteries or two-cell alkaline batteries. Under-voltage protection disables the part at a threshold of 2.1V. Thermal shut-down is set at 150 degrees C, above which the boost converter stops switching. Normal operation is resumed when temperature drops below 130 degrees C. Output over-voltage protection prevents system damage if one LED is accidentally disconnected. The EN/PWM pin functions both as logic chip-enable pin with low shut down current (< 1uA) and as LED-current PWM control pin. The LDS8710, LDS8716 and LDS8714 are available in a tiny 2 x 3 x 0.8 mm 8-pin TDFN package. Samples of the LDS8710 are available now. Samples of the LDS8716 and LDS8714 are scheduled for availability in June.
About Leadis Technology, Inc.
Leadis Technology, Inc., headquartered in Sunnyvale, California, designs, develops and markets analog and mixed-signal semiconductors that enable and enhance the features and capabilities of portable and consumer electronics devices. Leadis’ product offerings include capacitive touch controller ICs, which enable highly reliable touch-based input controls and attractive industrial design options for both mobile and non-mobile applications; LED drivers, which provide controlled levels of current required to drive light emitting diodes in diverse applications including mobile backlight units; and color display drivers, which are critical components of displays used in mobile consumer electronic devices.