SY7201A

Application Note: AN_SY7201/SY7201A 30V High Current Boost LED Driver General Description SY7201 and SY7201A are DC/DC step-up converters that deliver an accurate constant current for driving LEDs. Operation 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 SY7201 and SY7201A are ideal for driving up to eight white LEDs in series or up to 30V. Ordering Information SY7201□(□□)□ Temperature Code Package Code Optional Spec Code Temperature Range: -40°C to 85°C Ordering Number SY7201ABC SY7201ADC SY7201AABC Package type SOT23-6 TSOT23-6 SOT23-6 Dimming 20kHz~1MHz 20kHz~1MHz 100Hz~10kHz Features Input voltage range: 2.8 to 30V Switch current limit 2A Drives LED strings up to 30V 1MHz fixed frequency minimizes the external components Dimming frequency for EN/PWM pin: ο SY7201: 20kHz~1MHz ο SY7201A: 100Hz~10kHz Internal softstart limits the inrush current Open LED over voltage protection RoHS Compliant and Halogen Free Compact package: SOT23-6 pin Applications GPS Navigation Systems Handheld Devices Portable Media Players Typical Applications L D Vin Cin Dimming IN LX EN/PWM OVP GND FB R1 Figure 1. Schematic Diagram Vout Cout AN_SY7201/A Rev. 0.9 Silergy Corp. Confidential- Prepared for Customer Use Only 1 Pinout (top view) AN_SY7201/SY7201A Pin Name LX GND FB EN/P...