偉詮電子股份有限公司 Weltrend Semiconductor, Inc. WT7220 Current Regulator for LED Data Sheet REV. 0.10 NOV 16, 2005 The information in this document is subject to change without notice. Weltrend Semiconductor, Inc. All Rights Reserved. 新竹市科學工業園區工業東九路 24 號 2 樓 2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan TEL:886-3-5780241 FAX:886-3-5794278.5770419 Email:[email protected] WT7220 Data Sheet Rev. 0.10 GENERAL DESCRIPTION The WT7220 is a current regulator which provide 350mA constant sink current. It is optimal for use as LED drive. FEATURES • Low quiescent current • Low standby current <1uA. • Miniature package SOT-89 • Built-in thermal protection PIN CONFIGURATION PIN DESCRIPTION Pin No. Pin Name 1 VDD 2 GND 3 OUT TYPE P Power supply input. P Ground. O Output. Weltrend Semiconductor, Inc. Page 2 FUNCTION WT7220 Data Sheet Rev. 0.10 BLOCK DIAGRAM Absolute Maximum Operating Range, Ta=+25℃ CHARACTERISTICS Maximum supply voltage H-bridge output voltage Operating temperature Storage temperature SYMBOL VCC VOUT Topr Tstg VALUE -0.3 to +7.0 -0.3 to +7.0 -20 ~ +75 -40 ~ +150 Unit V V ℃ ℃ 3 *Note: Mounted on the 114.3x76.1x1.6 mm glass-epoxy board. Electrical Characteristics (VDD=4V,Ta= +25℃) Parameter Symbol Output Current Operating current Dissipation Load Regulation Line Regulation Thermal Protection Temperature IOUT IDD Conditions Vout=0.6V-3V Min. Typ. Max. Unit 310 350 0.3 390 mA mA mA/V mA/V o C Vout=0.2V-3V VDD=3V-6V Tpt 5 5 120 Weltrend Semiconductor, Inc. Page 3 WT7220 Data Sheet Rev. 0.10 TYPICAL APPLICATION Weltrend Semiconductor, Inc. Page 4