ZXSC440

ZXSC410/ZXSC420/ZXSC440 DC-DC BOOST SWITCHING CONTROLLERS Description The ZXSC410/420/440 are DC-DC boost controllers. Their wide input voltage range makes them suitable for operation for a number of battery configurations including single Li-Ion cell and 2~3 alkaline/NiCd/NiMH cells. Using high gain Diodes Zetex-brand switching npn-transistors allows high-voltage boost ratios and/or high output current depending on the transistor. The ZXSC410/440 has a shutdown feature that can also be used for some dimming functionality. ZXSC420/440 includes an End of Regulation flag that can be used to indicate when the regulator is no longer able to maintain the regulated output voltage/current or has reached the required current/voltage. The ZXSC440 combines the features of the ZXSC410 and ZXSC420 into one device. Pin Assignments ZXSC410 (SOT26) VCC 1 GND 2 STDN 3 8 DRIVE 7 VFB 6 SENSE ZXSC420 (SOT26) VCC 1 GND 2 EOR 3 8 DRIVE 7 VFB 6 SENSE Features  1.65V to 8V Supply Range  Typical Output Regulation of ±1%  Over 85% Typical Efficiency  Output Currents Up to 300mA  4.5µA Typical Shutdown Current ZXSC410/440  End of Regulation Output ZXSC420/440  Available in SOT26 and MSOP-8  Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)  Halogen and Antimony Free. “Green” Device (Note 3) ZXSC440 (MSOP-8) DRIVE 1 VFB 2 SENSE 3 N/C 4 8 VCC 7 GND 6 EOR 5 STDN Applications  System Power for Battery Portable Products  LCD Bias  Local Voltage Conversion  High-Brightness LED ...