• Input voltage range: 2.5 to 5.5V
• Switch current limit: 1A
• Drives LED strings up to 40V
• 1MHz fixed frequency minimizes the external components
• PWM dimming frequency:10kHz~1MHz
• Internal softstart limits the inrush current
• Open LED over voltage protection
• RoHS Compliant and Halogen Free
• Compact package: TSOT23-6

SY22101A is step-up DC/DC converters that deliver an accurate constant current for driving LEDs. Operating at a fixed switching frequency of 1MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor. The SY22101A is ideal for driving up to ten white LEDs in series or up to 40V.