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Linear Technology has announced the LT3598, a 45V, 2.5MHz DC/DC boost-mode converter designed to operate as a constant-current LED driver for up to 60 white LEDs.

The LT3598 can drive up to six strings of LEDs, each with up to 10 30mA white LEDs in series while delivering efficiencies up to 90 per cent.

Its multichannel capability makes it ideal for medium-sized TFT-LCD backlighting applications.

Its input voltage range of 3-30V makes it ideal for automotive and industrial applications.

It offers 1.5 per cent LED current-matching to ensure uniform brightness of the display.

Dimming ratios as high as 3,000:1 can be attained by using True Color PWM dimming.

A programmable 200kHz to 2.5MHz fixed-frequency operation and current-mode architecture offers stable operation over a range of supply and output voltages, while minimising the size of the external components.

Additionally, the switching frequency is able to be synchronised to an external clock.

Its thermally enhanced 4 x 4mm QFN package offers a compact solution for LED backlighting applications.

The LT3598 uses a single 1.5A, 45V internal switch to provide a boost-mode constant-current source.

However, even when VIN exceeds VOUT, the LT3598 will continue to regulate the LED current.

The internal boost converter uses an adaptive feedback loop to regulate the output voltage slightly higher than the required LED voltage to ensure maximum efficiency.

If any of the LED strings experiences an open circuit, it will continue to regulate the existing strings and signals the OpenLED alert pin.

If higher-current LEDs are required, multiple strings can be combined enabling it to drive up to two strings of 10 90mA LEDs.

Additional features include programmable overvoltage protection, LED current derating based on junction temperature and/or LED temperature, and output-voltage limiting when all LED strings are disconnected.

DC/DC boost-mode converter launched

Linear Technology has announced the LT3598, a 45V, 2.5MHz DC/DC boost-mode converter designed to operate as a constant-current LED driver for up to 60 white LEDs.

The LT3598 can drive up to six strings of LEDs, each with up to 10 30mA white LEDs in series while delivering efficiencies up to 90 per cent.

Its multichannel capability makes it ideal for medium-sized TFT-LCD backlighting applications.

Its input voltage range of 3-30V makes it ideal for automotive and industrial applications.

It offers 1.5 per cent LED current-matching to ensure uniform brightness of the display.

Dimming ratios as high as 3,000:1 can be attained by using True Color PWM dimming.

A programmable 200kHz to 2.5MHz fixed-frequency operation and current-mode architecture offers stable operation over a range of supply and output voltages, while minimising the size of the external components.

Additionally, the switching frequency is able to be synchronised to an external clock.

Its thermally enhanced 4 x 4mm QFN package offers a compact solution for LED backlighting applications.

The LT3598 uses a single 1.5A, 45V internal switch to provide a boost-mode constant-current source.

However, even when VIN exceeds VOUT, the LT3598 will continue to regulate the LED current.

The internal boost converter uses an adaptive feedback loop to regulate the output voltage slightly higher than the required LED voltage to ensure maximum efficiency.

If any of the LED strings experiences an open circuit, it will continue to regulate the existing strings and signals the OpenLED alert pin.

If higher-current LEDs are required, multiple strings can be combined enabling it to drive up to two strings of 10 90mA LEDs.

Additional features include programmable overvoltage protection, LED current derating based on junction temperature and/or LED temperature, and output-voltage limiting when all LED strings are disconnected.

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