ZXSC440X8TA Diodes Incorporated

ZXSC410/ZXSC420/ZXSC440 DC-DC BOOST SWITCHING CONTROLLERS Description Pin Assignments ZXSC410 (SOT26) The ZXSC410/420/440 are DC-DC boost controllers. Their wide input voltage range makes them suitable for operation for a number of V 1 8 DRIVE CC battery configurations including single Li-Ion cell and 2~3 GND 2 7 VFB alkaline/NiCd/NiMH cells. Using high gain Diodes Zetex-brand switching npn-transistors allows high-voltage boost ratios and/or high SENSE STDN 3 6 output current depending on the transistor. The ZXSC410/440 has a shutdown feature that can also be used for some dimming ZXSC420 (SOT26) functionality. ZXSC420/440 includes an End of Regulation flag that can be used to indicate when the regulator is no longer able to V 1 8 DRIVE CC maintain the regulated output voltage/current or has reached the VFB GND 2 7 required current/voltage. The ZXSC440 combines the features of the SENSE ZXSC410 and ZXSC420 into one device. EOR 3 6 Features ZXSC440 (MSOP-8) 1.65V to 8V Supply Range DRIVE 1 8 V CC Typical Output Regulation of 1% VFB 2 7 GND Over 85% Typical Efficiency Output Currents Up to 300mA SENSE 3 6 EOR 4.5A Typical Shutdown Current ZXSC410/440 N/C 4 5 STDN End of Regulation Output ZXSC420/440 Available in SOT26 and MSOP-8 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Applications Halogen and Antimony Free. Green Device (Note 3) System Power for Battery Portable Products LCD Bias Local Voltage Conversion High-Brightness LED Driving Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See ZXSC410/ZXSC420/ZXSC440 Pin Descriptions Pin Number Pin Name Function ZXSC410 ZXSC420 ZXSC440 V 1 1 8 Supply Voltage CC GND 2 2 7 Ground STDN 3 5 Shutdown (ZXSC410 and ZXSC440) EOR 3 6 End of regulation (ZXSC420 and ZXSC440) Inductor current sense input. Internal threshold voltage set to 28mV. Sense 4 4 3 Connect external sense resistor. Reference voltage. Internal threshold set to 300mV. V 5 5 2 FB Connect external resistor network to set output voltage. Drive output for external switching transistor. Drive 6 6 1 Connect to base or gate of external switching transistor. NC 4 No connection Functional Block Diagram 2 of 17 ZXSC410/ZXSC420/ZXSC440 August 2015 Diodes Incorporated www.diodes.com Document number: DS33618 Rev. 6 - 2