The News:

Vishay's 1.25 MHz White LED Drivers Feature 90 % Typical Efficiency, Wide Input Voltage Range of 2.5 V to 6.0 V, and 28 V Output Capability Vishay Intertechnology, Inc. (NYSE: VSH) announces the release of two new 1.25 MHz current-mode boost converters optimized for white LED applications

• Compact LED driver solution is offered in the TSOT23-6 package and requires minimal external components
• Current-mode control with internal frequency compensation
• Provides overvoltage protection, cycle-by-cycle current limit of 0.55 A, and thermal shutdown block
• Internal Integrated power switch and high-frequency 1.25 MHz switching allows for the use of a small size inductor, reducing the required board space
• Ultra-low shutdown current of less than 1 µA
• Improved conversion efficiency with a low feedback voltage of 0.1 V and a tight switching frequency

The Key Benefits:

• Industry's best efficiency at greater than 90 %, an input voltage range of 2.5 V to 6.0 V, and output voltages of up to 17 V for the SiP12510 and 28 V for the SiP12511
• Drive up to eight LEDs in series
• Compact LED driver solution is packaged in TSOT23-6, requires minimal external components
• Features internal integrated power switch and high-frequency 1.25 MHz switching oscillator
  • Allows for the use of a small size inductor, reducing the required board space
• Offers a complete range of protection features
  • Overvoltage protection
  • Undervoltage lockout protection
  • Cycle-by-cycle current limit of 0.55 A supporting up to three parallel strings of 20 mA each
  • Thermal shutdown block once the internal temperature exceeds the 165 °C typical temperature threshold
• Full control over LED illumination intensity
  • Supports both linear and PWM techniques for regulating the LED string current Built-in three-phase soft-start function
  • Diminishes the required peak current during start-up
• Ultra-low shutdown current of less than 1 µA

The Key Applications:

• Driving white LEDs in space-constrained, battery-operated, portable applications such as cell phones, PDAs, and digital cameras

The Key Specifications:

The Perspective:

Vishay's two new 1.25 MHz boost converters provide 90 % typical efficiency, a wide input voltage range of 2.5 V to 6.0 V, and output voltages of up to 17 V for the SiP12510 and 28 V for the SiP12511. The device can drive up to eight white LEDs. The SiP12510/11 features a remarkable combination of features, including high efficiency (90 %), ultra-low shutdown current (<1 µA), and minimal board space requirements. These unique characteristics make the SiP12510 and 12511 ideal for space-constrained, battery-operated portable electronic applications such as cell phones, PDAs, and digital cameras.

Availability:

Samples of the new SiP12510 and SiP12511 are available now. Production quantities will be available in Q2 2007, with lead times of 13 weeks for larger orders.