Intersil, Toshiba and Linear debut new driver ICs

Toshiba America Electronic Components (TAEC) announced four new 16-channel driver ICs for LED-backlit applications ranging from notebook PCs to large TVs. Intersils new ISL9767x LED driver family seeks to extend battery life in notebook, netbook, and tablet computers. Linear Technologys new LTM8042 family can withstand 40V input transients in backlight applications and rugged environments such as automotive and avionic applications.

The new Toshiba LED drivers target an extremely broad application range with features specific to the application. For example, the TC62D722 targets high-end displays in TVs and offers a 16-bit pulse-width-modulation (PWM) mode that reduces display flicker in such applications.

The new TC62D776 targets applications in which idle-mode power consumption is important battery powered devices for instance. The IC integrates a standby mode that reduces idle-mode power consumption by a factor of a 1000 relative to drivers that lack a standby-mode function. The new TC62D748A/49A are targeted at cost-optimized applications requiring minimal external circuitry to configure the .

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Ultra-low dimming extends battery life

In Intersils newest LED drivers, a low-level, yet efficient dimming capability greatly extends the battery life in notebook and similar displays. LED spotlight ,The ISL9767x family members drive up to six 40mA strings of LEDs and deliver 0.7% current matching between strings. The design reduces backlight-induced visual artifacts such as flickering, shimmering, and banding.

An adaptive boost control circuit that regulates the driver output voltage is the key to efficient low-level dimming. The drivers maintain dimming linearity even when the LEDs are off for most of the PWM duty cycle. The drivers can dim LEDs to 0.007% of full brightness.

The Linear Technology LTM8042 and LTM80420-1 Module drivers can power strings of 8 white LEDs or 9 red LEDs. PWM-based dimming offers a 3000:1 ratio. The drivers can operate in buck, boost, or buck-boost modes and offer 0.5% line regulation along with the aforementioned transient protection. The LTM8042 sources 1A of current while the LTM8042-1 sources 350 mA.