Brief Description
KTD2694 is the ideal power solution for high-power flash LEDs used with cell phone camera modules or digital still cameras. It is a highly integrated step up DC-DC converter with very high switching frequency, fixed at 2MHz, providing a very small total solution for portable photo flash. KTD2694 uses ExpressWire single-wire programming for maximum flexibility. The maximum flash-mode LED current is set by an external resistor, and the flash-mode and movie-mode currents can be programmed in 16 steps by the ExpressWire interface at CTRL pin. An AUX pin allows highest priority ON/OFF flash mode control. KTD2694 internally monitors the input voltage, disabling LED current when the supply drops below the programmed threshold voltage.

FEATUREs
• Drive up to 1.5A flash current
• Programmable threshold low-voltage input
   protection
• High efficiency converter (up to 90%)
• Input voltage range: 2.7V to 5.5V
• 2MHz step-up converter
• Very small inductor: 1.0μH to 2.2μH
• Very small load capacitor: 4.7μF to 10μF
• ExpressWireTM digital control enables and
   programs flash and movie current in 16 steps
• External resistor sets maximum flash current
• Integrated thermal regulation control
• 2mA LED shorting test current and 1.7V
   forward voltage threshold
• LED open/short protection
• Over-voltage protection
• Cycle-by-cycle inductor current limit
• Programmable flash timeout protection
• 0.1µA shutdown current
• Pb-free Package: UDFN22-10L
• -40°C to +85°C Temperature Range

APPLICATIONs
• Mobile Phones
• Smart Phones and PDAs
• Digital Still Cameras