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ST1938 Arkusz danych(PDF) 1 Page - Stanson Technology |
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ST1938 Arkusz danych(HTML) 1 Page - Stanson Technology |
1 / 5 page ST1938 DC-DC Step-Up Converter for White LED Driver STANSON TECHNOLOGY 120 Bentley Square, Mountain View, Ca 94040 USA www.stansontech.com ST1938 2008. V1 DESCRIPTION The ST1938 is a step-up DC/DC converter for white LED driver with over voltage protection. The device can driver one to four LEDs in series from a single cell Lithium Ion battery. Internal functions include current limiting; thermal shutdown; OVP and soft-start to prevent damage operate status. The ST1938 operates at 0.8MHz and from low input voltages as low as 1.5V; apply to Lithium-Ion powered systems. A low 95mV reference voltage minimizes power loss in the current setting resistor for better efficiency. The ST1938 is available in small package SOT-23-6L PIN CONFIGURATION SOT23-6L PART MARKING APPLICATIONS Battery Power Equipment Notebook Computers PDA Cellular Phone FEATURES Current Source with Over Voltage Protection Fast 0.8MHz Switching Frequency High Efficiency up to 87% Drives up to Four LEDs From 3.2V Supply Drives up to Six LEDs From a 5V Supply Low Quiescent Current Disconnects LEDs in Shutdown Mode Internal Over Temperature and Current Limiting Shutdown Function Internal Soft-Start Circuit 36V Rugged Bipolar Switch Available in a Small SOT-23-6L Package |
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