STI9287

A step-up converter designed for driving up to 7 series white LED's from a single cell Lithium Ion battery. Uses current mode, fixed frequency architecture to regulate an LED current, which is measured through an external current sense resistor. Its low 202mV feedback voltage with EN/PWM Pulling High reduces power loss and improves efficiency. Includes under-voltage lockout, current limiting and thermal overload protection preventing damage in the event of an output overload. Optimized operation frequency can meet the requirement of small LC filters value and low operation current with high efficiency. Internal soft start function can reduce the inrush current. Tiny package type provides the best solution for PCB space saving and total BOM cost.

Applications

• Camera Flash White LED
• Mobile Phone, Smart Phone LED Backlight
• PDA LED Back light
• Digital Still Cameras
• Camcorder

Key features

• Output Voltage up to 30V
• Input Voltage Range: 2.5V to 7V
• High Efficiency: Up to 90%
• 1.0MHz Constant Frequency Operation
• Integrated Power MOSFET
• Drives up to 7 Series WLEDs
• 202mV VFB Voltage with EN/PWM Pulling High
• Soft-start/Dimming with wide PWM Frequency Range
• UVLO, Thermal Shutdown
• Internal Current limit
• Over Voltage Protection
• Small LC Filter Components
• Minimize the External Component
• <1μ Shutdown Current
• SOT23-6 Package